IDT IDT5V9882T

IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
3.3V EEPROM
PROGRAMMABLE CLOCK
GENERATOR
FEATURES:
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IDT5V9882T
DESCRIPTION:
Three internal PLLs
Internal non-volatile EEPROM
FAST mode I2C serial interfaces
Input Frequency Ranges: 1MHz to 400MHz
Output Frequency Ranges: 4.9kHz to 500MHz
Reference Crystal Input with programmable oscillator gain and
programmable linear load capacitance
− Crystal Frequency Range: 8MHz to 50MHz
Each PLL has an 8-bit pre-scaler and a 12-bit feedback-divider
10-bit post-divider blocks
Fractional Dividers
Two of the PLLs support Spread Spectrum Generation
capability
I/O Standards:
− Outputs - 3.3V LVTTL/ LVCMOS, LVPECL, and LVDS
− Inputs - 3.3V LVTTL/ LVCMOS
Programmable Slew Rate Control
Programmable Loop Bandwidth Settings
Programmable output inversion to reduce bimodal jitter
Individual output enable/disable
Power-down mode
3.3V VDD
Available in TSSOP package
The IDT5V9882T is a programmable clock generator intended for high
performance data-communications, telecommunications, consumer, and
networking applications. There are three internal PLLs, each individually
programmable, allowing for three unique non-integer-related frequencies.
The frequencies are generated from a single reference clock. The
reference clock can come from one of the two redundant clock inputs. A
glitchless automatic or manual switchover function allows any one of the
redundant clocks to be selected during normal operation.
The IDT5V9882T can be programmed through the use of the I2C
interfaces. The programming interface enables the device to be programmed when it is in normal operation or what is commonly known as insystem programmable. An internal EEPROM allows the user to save and
restore the configuration of the device without having to reprogram it on
power-up.
Each of the three PLLs has an 8-bit pre-scaler and a 12-bit feedback
divider. This allows the user to generate three unique non-integer-related
frequencies. The PLL loop bandwidth is programmable to allow the user
to tailor the PLL response to the application. For instance, the user can tune
the PLL parameters to minimize jitter generation or to maximize jitter
attenuation. Spread spectrum generation and fractional divides are
allowed on two of the PLLs.
There are 10-bit post dividers on five of the six output banks. Two of the
six output banks are configurable to be LVTTL, LVPECL, or LVDS. The
other four output banks are LVTTL. The outputs are connected to the PLLs
via the switch matrix. The switch matrix allows the user to route the PLL
outputs to any output bank. This feature can be used to simplify and optimize
the board layout. In addition, each output's slew rate and enable/disable
function can be programmed.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
JUNE 2010
1
c
2010
Integrated Device Technology, Inc.
DSC 7064/2
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
XTALOUT
OSC.
XTALIN/REFIN
OUT1
P2 Divider
10-Bit
/2
OUT2
PLL 0
(1)
OUT3
P4 Divider
10-Bit
PLL 1
/2
(1)
OUT3
PLL 2
P6 Divider
10-Bit
EEPROM
Control Block for
Multi-Purpose I/O, Programming, Features
SHUTDOWN/OE/
SUSPEND
GIN1/SCLK/TCLK
GIN0/SDAT
I 2 C_MFC
NOTE:
1. OUT3 pair can be configured to be LVDS, LVPECL, or two single-ended LVTTL outputs.
2
/2
OUT4
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
OUT2
1
16
SHUTDOWN/OE/
SUSPEND
VDD
2
15
VDD
XTALIN/REFIN
3
14
I C_MFC
XTALOUT
4
13
GIN1/SCLK
OUT1
5
12
GIN0/SDAT
GND
6
11
GND
OUT3
7
10
OUT4
OUT3
8
9
VDD
2
TSSOP
TOP VIEW
PIN DESCRIPTION
Pin Name
Pin#
I/O
Type
Description
XTALIN/REFIN
3
I
LVTTL
CRYSTAL_IN - Reference crystal input or external reference clock input
XTALOUT
4
O
LVTTL
CRYSTAL_OUT -Reference crystal feedback
GIN0/SDAT
16
I
LVTTL
Multi-purpose inputs. Can be used for Frequency Control or SDAT(I2C).
GIN1/SCLK
17
I
LVTTL
Multi-Purpose inputs. Can be used for Frequency Control or SDAT(I2C).
SHUTDOWN/OE/SUSPEND
20
I
LVTTL
Enables/disables the outputs, PLLs or powers down the chip.
I2C_MFC
18
I
3-level
OUT1
5
O
LVTTL
OUT2
1
O
LVTTL
OUT3
7
O
Adjustable(2)
Configurable clock output 3, Single-Ended or Differential when combined with OUT3
OUT3
8
O
Adjustable(2)
Configurable complementary clock output 3, Single-Ended or Differential when combined with OUT3
OUT4
13
O
LVTTL
VDD
2, 13, 19
GND
6, 15
(1)
I2C (HIGH) or MFC Mode (MID)
Configurable clock output 1. Can also be used to buffer the reference clock.
Configurable clock output 2
Configurable clock output 4
3.3V Power Supply
Ground
NOTES:
1. 3-level inputs are static inputs and must be tied to VDD or GND or left floating. These inputs are internally biased to VDD/2. They are not hot-insertable or over voltage tolerant.
2. Outputs are user programmable to drive single-ended 3.3V LVTTL, differential LVDS, or differential LVPECL interface levels.
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PLL FEATURES AND DESCRIPTIONS
D0 Divider
/ 8-bit
VCO
M0 Multiplier
/ 12-bit
Spread
Spectrum
Modulation
PLL0 Block Diagram
D1 Divider
/ 8-bit
VCO
M1 Multiplier
/ 12-bit
Spread
Spectrum
Modulation
PLL1 Block Diagram
D2 Divider
/ 8-bit
VCO
M2 Multiplier
/ 12-bit
PLL2 Block Diagram
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Pre-Divider (D) Values
Multiplier (M) Values
Programmable Loop Bandwidth
Spread Spectrum
Generation Capability
PLL0
1 - 255
2 - 8190
yes
yes
PLL1
1 - 255
2 - 8190
yes
yes
PLL2
1 - 255
1 - 4095
yes
no
CRYSTAL INPUT (XTALIN/REFIN)
Where FIN is the reference frequency, M is the total feedback-divider value,
D is the pre-scaler value, P is the total post-divider value, and FOUT is the resulting
output bank frequency. The value 2 in the denominator is due to the divideby-2 on each of the output banks OUT2-4. Note that OUT1 does not have any
type of post-divider. Also, programming any of the dividers may cause glitches
on the outputs.
The crystal oscillators should be fundamental mode quartz crystals: overtone
crystals are not suitable. Crystal frequency should be specified for parallel
resonance with 50Ωmaximum equivalent series resonance.
When the XTALIN/REFIN pin is driven by a crystal, it is important to set the
internal oscillator inverter drive strength and internal tuning/load capacitor
values correctly to achieve the best clock performance. These values are
programmable through an I2C_MFC interface to allow for maximum compatibility
with crystals from various manufacturers, processes, performances, and
qualities. The internal load capacitors are true parallel-plate capacitors for ultralinear performance. Parallel-plate capacitors were chosen to reduce the
frequency shift that occurs when non-linear load capacitance interacts with load,
bias, supply, and temperature changes. External non-linear crystal load
capacitors should not be used for applications that are sensitive to absolute
frequency requirements. The value of the internal load capacitors are determined
by XTALCAP[7:0] bits, (0x07). The load capacitance can be set with a resolution
of 0.125 pF for a total crystal load range of 3.5pF to 35.4pF. Check with the
vendor's crystal load capacitance specification for the exact setting to tune the
internal load capacitor. The following equation governs how the total internal
load capacitance is set.
Pre-Scaler
D[7:0] are the bits used to program the pre-scaler for each PLL, D0 for
PLL0, D1 for PLL1, and D2 for PLL2. The pre-scalers divide down the
reference clock with integer values ranging from 1 to 255. To maintain low jitter,
the divided down clock must be higher than 400KHz; it is best to use the smallest
D divider value possible. If D is set to '0x00', then this will power down the PLL
and all the outputs associated with that PLL.
XTAL load cap = 3.5pF + XTALCAP[7:0] * 0.125pF (Eq. 1)
Parameter
XTALCAP
Bits
8
Step
0.125
Min
0
Max
32
Units
pF
When using an external reference clock instead of a crystal on the XTAL/
REFIN pin, the input load capacitors may be completely bypassed. This allows
for the input frequency to be up to 200MHz. When using an external reference
clock, the XTALOUT pin must be left floating, XTALCAP must be programmed
to the default value of "0", and crystal drive strength bit, XDRV (0x06), must
be set to the default value of "11".
PRE-SCALER, FEEDBACK-DIVIDER, AND
POST-DIVIDER
Each PLL incorporates an 8-bit pre-scaler and a 12-bit feedback divider
which allows the user to generate three unique non-integer-related frequencies.
For output banks OUT2-OUT4, each bank has a 10-bit post-divider. The
following equation governs how the frequency on output banks OUT2-4 is
calculated.
M
FOUT = FIN * D ( )
P*2
(Eq. 2)
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Feedback-Divider
N[11:0] and A[3:0] are the bits used to program the feedback-divider for PLL0 (N0 and A0) and PLL1 (N1 and A1). If spread spectrum generation is enabled
for either PLL0 or PLL1, then the SS_OFFSET[5:0] bits (0x61, 0x69) would be factored into the overall feedback divider value. See the SPREAD SPECTRUM
GENERATION section for more details on how to configure PLL0 and PLL1 when spread spectrum is enabled. The two PLLs can also be configured for fractional
divide ratios. See FRACTIONAL DIVIDER for more details. For PLL2, only the N[11:0] bits (N2) are used to program its feedback divider and there is no spread
spectrum generation and fractional divides capability. The12-bit feedback-divider integer values range from 1 to 4095.
The following equations govern how the feedback divider value is set. Note that the equations are different for PLL0/PLL1 and PLL2
PLL0 and PLL1:
M = 2*N[11:0] + A[3:0] + 1 + SS_OFFSET[5:0] * 1/64
M = 2*N[11:0] + A[3:0] + 1 (spread spectrum disabled)
(Eq. 3)
(Eq. 4)
A[3:0] = 0000 = -1
= 0001 = 1
= 0010 = 2
= 0011 = 3
.
.
.
= 1111 = 15
Note: A[3:0] < (N[11:0] - 1), must be met when using A.
PLL2:
M = N[11:0]
(Eq. 5)
The user can achieve an even or odd integer divide ratio for both PLL0 and PLL1 by setting the A[3:0] bits accordingly and disabling the spread spectrum.
A fractional divide can also be set for PLL0 and PLL1 by using the A[3:0] bits in conjunction with the SS_OFFSET[5:0] bits, which is detailed in the FRACTIONAL
DIVIDER section. Note that the VCO has a frequency range of 10MHz to 1100MHz. To maintain low jitter, it is best to maximize the VCO frequency. For example,
if the reference clock is 100MHz and a 200MHz clock is required, to achieve the best jitter performance, multiply the 100MHz by 11 to get the VCO running at
the highest possible frequency of 1100MHz and then divide it down to get 200MHz. Or if the reference clock is 25MHz and 20MHz is the required clock, multiply
the 25MHz by 40 to get the VCO running at 1000MHz and then divide it down to get 20MHz. If N is set to '0x00', the VCO will slew to the minimum frequency.
Post-Divider
Q[9:0] are the bits used to program the 10-bit post-dividers on output banks OUT2-4. OUT1 bank does not have a 10-bit post-divider or any other postdivide along its path. The 10-bit post-dividers will divide down the output banks' frequency with integer values ranging from 1 to 1023.
There is the option to choose between disabling the post-divider, utilizing a div/1, a div/2, or the 10-bit post-divider by using the PM[1:0] bits. . Each bank,
except for OUT1, has a set of PM bits. When disabling the post-divider, no clock will appear at the outputs, but will remain powered on. The values are listed
in the table below.
P
PM[1:0]
00
01
10
11
P Post-Divider
disabled
div/1
div/2
Q[9:0] + 2 (Eq. 6)
00
01
VCO
To Outputs
/2
10
/2
11
/ (Q+2)
PM[1:0]
Post-Divider Diagram
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Note that the actual 10-bit post-divider value has a 2 added to the integer value Q and the outputs are routed through another div/2 block. The post-divider
should never be disabled unless the output bank will never be used during normal operation. The output frequency range for LVTTL outputs are from 4.9KHz
to 200MHz. The output frequency range for LVPECL/LVDS outputs are from 4.9KHz to 500MHz.
SPREAD SPECTRUM GENERATION
PLL0 and PLL1 support spread spectrum generation capability, which users have the option of turning on and off. Spread spectrum profile, frequency, and
spread are fully programmable (within limits). The programmable spread spectrum generation parameters are TSSC[3:0], NSSC[3:0], SS_OFFSET[5:0],
SD[3:0], DITH, and X2 bits. These bits are in the memory address range of 0x60 to 0x67 for PLL0 and 0x68 to 0x6F for PLL1. The spread spectrum generation
on PLL0 & PLL1 can be enabled/disabled using the TSSC[3:0] bits. To enable spread spectrum, set TSSC > '0' and set NSSC, SD[3:0], SD[5:0], and the
A[3:0] in the total M value accordingly. And to disable, set TSSC = '0'.
TSSC[3:0]
These bits are used to determine the number of phase/frequency detector cycles per spread spectrum cycle (ssc) steps. The modulation frequency can be
calculated with the TSSC bits in conjunction with the NSSC bits. Valid TSSC integer values for the modulation frequency range from 5 to 14.
NSSC[3:0]
These bits are used to determine the number of delta-encoded samples used for a single quadrant of the spread spectrum waveform. All four quadrants
of the spread spectrum waveform are mirror images of each other. The modulation frequency is also calculated based off the NSSC bits in conjunction with the
TSSC bits. Valid NSSC integer values range from 1 to 6.
SS_OFFSET[5:0]
These bits are used to program the fractional offset with respect to the nominal M integer value. For center spread, the SS_OFFSET should be set to '0' so
the spread spectrum waveform is about the nominal M (Mnom) value. For down spread, the SS_OFFSET > '0' so the spread spectrum wavform is about the
(Mideal -1 = Mnom) value. The downspread percentage can be thought of in terms of center spread. For example, a downspread of -1% can also be considered
as a center spread of ±0.5% but with Mnom shifted down by one and offset. The SS_OFFSET has integer values ranging from 0 to 63.
SD[3:0]
These bits are used to shape the profile of the spread spectrum waveform. These are delta-encoded samples of the waveform. There are twelve sets of
SD samples for each PLL. The NSSC bits determine how many of these samples are used for the waveform. The sum of these delta-encoded samples (sigmadelta-encoded samples) determine the amount of spread and should not exceed (63 - SS_OFFSET). The maximum spread is inversely proportional to the
nominal M integer value.
DITH
This bit is for dithering the sigma-delta-encoded samples. This will randomize the least-significant bit of the input to the spread spectrum modulator. Set the
bit to '1' to enable dithering.
X2
This bit will double the total value of the sigma-delta-encoded-samples which will increase the amplitude of the spread spectrum waveform by a factor of two.
When X2 is '0', the amplitude remains nominal but if set to '1', the amplitude is increased by x2.
The following equations govern how the spread spectrum is set:
TSSC = TSSC[3:0] + 2
(Eq. 7)
NSSC = NSSC[3:0] * 2
(Eq. 8)
SD[3:0]K = SJ+1(unencoded) - SJ(unencoded) (Eq. 9)
where SJ is the unencoded sample out of a possible 12 and SDK is the delta-encoded sample out of a possible 12.
Amplitude = (2*N[11:0] + A[3:0] + 1) * Spread% / 100
2
if 1 < Amp < 2, then set X2 bit to '1'.
(Eq. 10)
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Modulation frequency:
FPFD = FIN / D (Eq. 11)
FVCO = FPFD * MNOM (Eq. 12)
FSSC = FPFD / (4 * Nssc * Tssc)
(Eq. 13)
Spread:
ΣΔ = SD0 + SD1 + SD2 + … + SD11
the number of samples used depends on the NSSC value
ΣΔ ≤ 63 - SS_OFFSET
±Spread% =
ΣΔ * 100
64 * (2*N[11:0] + A{3:0} + 1)
(Eq. 14)
±Max Spread% / 100 = 1 / MNOM or 2 / MNOM (X2=1)
Profile:
Waveform starts with SS_OFFSET, SS_OFFSET + SDJ, SS_OFFSET + SDJ+1, etc.
Spread Spectrum Using Sinusoidal Profile
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Example
FIN = 25MHz, FOUT = 100MHz, Fssc = 33KHz with center spread of ±2%. Find the necessary spread spectrum register settings.
Since the spread is center, the SS_OFFSET can be set to '0'. Solve for the nominal M value; keep in mind that the nominal M should be chosen to maximize
the VCO. Start with D = 1, using Eq.10 and Eq.11.
MNOM = 1100MHz / 25MHz = 44
Using Eq.4, we arbitrarily choose N = 20, A = 3. Now that we have the nominal M value, we can determine TSSC and NSSC by using Eq.12.
Nssc * Tssc = 25MHz / (33KHz * 4) = 190
However, using Eq. 7 and Eq.8, we find that the closest value is when TSSC = 14 and NSSC = 6. Keep in mind to maximize the number of samples used
to enhance the profile of the spread spectrum waveform.
Tssc = 14 + 2 = 16
Nssc = 6 * 2 = 12
Nssc * Tssc = 192
Use Eq.14 to determine the value of the sigma-delta-encoded samples.
±2% = ΣΔ * 100
64 * 44
ΣΔ = 56.32
Either round up or down to the nearest integer value. Therefore, we end up with 56 or 57 for sigma-delta-encoded samples. Since the sigma-delta-encoded
samples must not exceed 63 with SS_OFFSET set to '0', 56 or 57 is well within the limits. It is the discretion of the user to define the shape of the profile that
is better suited for the intended application.
Using Eq.14 again, the actual spread for the sigma-delta-encoded samples of 56 and 57 are ±1.99% and ±2.02%, respectively.
Use Eq.10 to determine if the X2 bit needs to be set;
Amplitude = 44 * (1.99 or 2.02) / 100 = 0.44 < 1
2
Therefore, the X2 = '0 '. The dither bit is left to the discretion of the user.
The example above was of a center spread using spread spectrum. For down spread, the nominal M value can be set one integer value lower to 43.
Note that the 5v9882T should not be programmed with TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator.
The PLL loop bandwidth must be at least 10x the modulation frequency along with higher damping (larger ωuz) to prevent the spread spectrum from being filtered
and reduce extraneous noise. Refer to the LOOP FILTER section for more detail on ωuz. The A[3:0] must be used for spread spectrum, even if the total multiplier
value is an even integer.
FRACTIONAL DIVIDER
There is the option for the feedback-divider to be programmed as a fractional divider for only PLL0 and PLL. By setting TSSC > '0' and SD bits to '0', the
SS_OFFSET bits would determine the fractional divide value. See the SPREAD SPECTRUM GENERATION section for more details on the TSSC, SD, and
SS_OFFSET bits. The following equation governs how the fractional divide value is set.
M = 2*N[11:0] + A[3:0] + 1 + SS_OFFSET[5:0] *1/64
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
The spread spectrum parameters such as the modulation frequency and profile will not be enabled nor will it have any impact on the PLL output when the
PLL is programmed for fractional divide.
The following is an example of how to set the fractional divider.
Example
FIN = 20MHz, FOUT1 = 168.75MHz, FOUT2 = 350MHz
Solving for 350MHz using Eq.2 and Eq.3 with PLL0 and spread spectrum off,
350MHz = 20MHz * (M / D)
P*2
For better jitter performance, keep D as small as possible
350MHz * 2 = M = 35
20MHz
P 1
Therefore, we have D = 1, M = 35 (N = 16, A = 2) for PLL0 with P = 1 on output bank4 resulting in 350MHz.
Solving for 168.75MHz with PLL1 and fractional divide enabled:
168.75MHz = 20MHz * (M / D)
P*2
168.75MHz * 2 = M = 16.875 or 33.75
20MHz
P
1
2
The 33.75 value is chosen to achieve the highest VCO frequency possible. Next step is to figure out the setting for the fractional divide using Eq.3.
33.75 = 2*N + A + 1 + SS_OFFSET * 1/64
Integer value 33 can be determined by N and A, thus leaving 0.75 left to be solved.
2*N + A + 1 = 33
SS_OFFSET = 64 * 0.75 = 48
Therefore, we have D=1, M=33.75 (N=15, A=2, SS_OFFSET=48) for PLL1 with P=2 on an output bank resulting in 168.75MHz.
The fractional divider can be determined if it is needed by following the steps in the previous example. Note that the 5v9882T should not be programmed
with TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator. The A[3:0] must be used and set to be greater than
'2' for a more accurate fractional divide.
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
LOOP FILTER
The loop filter for each PLL can be programmed to optimize the jitter performance. The low-pass frequency response of the PLL is the mechanism that dictates
the jitter transfer characteristics. The loop bandwidth can be extracted from the jitter transfer. A narrow loop bandwidth is good for jitter attenuation while a wide
loop bandwidth is best for low jitter generation. The specific loop filter components that can be programmed are the resistor via the RZ[3:0] bits, pole capacitor
via the CZ[3:0] bits, zero capacitor via the CP[3:0] bits, and the charge pump current via the IP[2:0] bits.
The following equations govern how the loop filter is set.
VDD
Ip
UP
To VCO
From PFD
DOWN
Rz
Ip
Cp
Cz
Charge Pump and Loop Filter Configuration
Resistor (Rz) = 0.3KΩ + RZ[3:0] * 1KΩ
(Eq. 15)
Zero capacitor (Cz) = 6pF + CZ[3:0] * 27.2pF (Eq. 16)
Pole capacitor (Cp) = 1.3pF + CP[3:0] * 0.75pF (Eq. 17)
Charge pump current (Ip) = 5 * 2IP[2:0] μA
Parameter
Bits
(Eq. 18)
Step
Min
Max
Units
RZ
4
1
0.3
15.3
KΩ
CZ
4
27.2
6
414
pF
CP
4
0.75
1.3
12.55
pF
IP
3
2
5
640
μA
n
PLL loop filter design is beyond the scope of this datasheet. Refer to design procedures for 3-order charge-pump based PLLs. For the sake of simplicity,
the fastest and easiest way to calculate the PLL loop bandwidth (Fc) given the programmable loop filter parameters is as follows.
PLL Loop Bandwidth:
Charge pump gain (Kφ) = Ip / 2π
(Eq. 19)
VCO gain (KVCO) = 950MHz/V * 2π (Eq. 20)
M = Total multiplier value (See the PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail)
ωc = Rz * Kφ * KVCO * Cz (Eq. 21)
M * (Cz + Cp)
Fc = ωc / 2π
(Eq. 22)
Note, the phase/frequency detector frequency (FPFD) is typically seven times the PLL closed-loop bandwidth (Fc) but too high of a ratio will reduce your
phase margin thus compromising loop stability.
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IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
To determine if the loop is stable, the phase margin (ωm) would need to be calculated as follows.
Phase Margin:
ωz = 1 / (Rz * Cz)
ωp = Cz + Cp
Rz * Cz * Cp
(Eq. 23)
(Eq. 24)
φm = (360 / 2π ) * [tan-1(ωc/ ωz) - tan-1(ωc/ ωp)] (Eq. 25)
To ensure stability in the loop, the phase margin is recommended to be > 60° but too high will result in the lock time being excessively long. Certain loop filter
parameters would need to be compromised to not only meet a required loop bandwidth but to also maintain loop stability.
Example
Fc = 150KHz is the desired loop bandwidth. The total M value is 850. The ratio of ωp/ωc should be at least 4. A rule of thumb that will help to aid the way,
the ωp / ωc ratio should be at least 4. Given Fc and M, an optimal loop filter setting needs to be solved for that will meet both the PLL loop bandwidth and maintain
loop stability.
The charge pump gain should be relatively small as possible to achieve a low loop bandwidth.
Ip = 40uA .
Kφ * KVCO = 950MHz/V * 40uA = 38000A/Vs
Loop Bandwidths
ωc = 2π * Fc = 9.42x105 s-1
ωuz = ωp / ωc = 4
(Eq. 26)
ωc2 = ωp * ωz
(Eq. 27)
ωp = Cz + Cp = ωz (1 + Cz / Cp)
Rz * Cz * Cp
Solving for Cz, Cp, and Rz
Knowing ωc = Rz * Kφ * KVCO * Cz and substituting in the equations from above,
M * (Cz + Cp)
Cz >>> Cp, therefore, we can easily derive Cp to be
Cp = Kφ * KVCO
= 12.60pF
M * ωc2 * ωuz
Similarly for Cz and Rz
Cz = Kφ * KVCO * (ωuz2 - 1) = Cp * (ωuz2 - 1) = 189pF
M * ωc2 * ωuz
Rz =
M * ωc * ωuz2
= 22.48KΩ
Kφ * KVCO * (ωuz2 - 1)
Based on the loop filter parameter equations from above, since there are no possible values of 12.60pF for Cp, 189pF for Cz, and 22.48KΩfor Rz, the next
possible values within the loop filter settings are 12.55pF (CP[3:0]=1111), 196.4pF (CZ[3:0]=0111), and 15.3KΩ(RZ[3:0]=1111), respectively. This loop filter
setting will yield a loop bandwidth of about 102KHz. The phase margin must be checked for loop stability.
φm = (360 / 2π ) * [tan-1 (6.41x105 s-1 / 3.33x105 s-1) - tan-1 (6.41x105 s-1 / 5.54x106 s-1)] = 56°
Although slightly below 60°, the phase margin would be acceptable with a fairly stable loop.
12
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
CONFIGURING THE MULTI-PURPOSE I/Os
The 5V9882T can operate in two distinct modes. These modes are controlled by the I2C_MFC pin. The general purpose I/O pins (GIN0 and GIN1) have
different uses depending on the mode of operation. The modes of operation are:
1)
Manual Frequency Control (MFC) Mode for PLL0 Only
2)
I2C Programming Mode
Along with the GINx pins are also GOUTx output pins that can take up a different function depending on the mode of operation. See table below for description.
Multi-Purpose Pins
GIN0
GIN1
Other Signal Functions
SDAT
SCLK
Signal Description
I2C serial data input / config select input
I2C clock input / config select input
Each PLL's programming registers can store up to four different Dx and Mx configurations in combination with two different P configurations in MFC modes.
The post-divider should never be disabled in any of the two P configurations unless the output bank will never be used during normal operation. The PLL's
loop filter settings also has four different configurations to store and select from. This will be explained in the MODE1 and MODE2 sections. The use of the GINx
pins in MFC mode control the selection of these configurations.
MODE1 - Manual Frequency Control (MFC) Mode for PLL0 Only
In this mode, only the configuration of PLL0 can be changed during operation. The GIN0 and GIN1 pins control the selection of up to four different D0, M0,
P, RZ0, CZ0, PZ0, and IP0 stored configurations.
The output banks will each have two P configurations that can be associated with each of the PLL configurations. Each of the two P configurations has its own
set of PM bits (See the PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail on the PM bits). Use the ODIV bit to choose which
post-divider configuration to associate with a specific PLL configuration. For example, if ODIV0_CONFIG0=1, then when Config0 is selected Qx[9:0]_CONFIG1
is selected as the post-divider value to be used. Or if ODIV2_CONFIG3 = 0, then when CONFIG7 is selected, Qx[9:0]_CONFIG0 is selected. Note that there
is an ODIVx bit for each of the PLL configurations. In this way, the post-divider values can change with the configuration.
To enter this mode, I2C_MFC pin must be left floating.
GIN1 Pin
0
GIN0 Pin
0
PLL0 Configuration Selection (Mode 1)
Configuration 0: D0_CONFIG0, M0_CONFIG0, and ODIV0_CONFIG0
0
1
Configuration 1: D0_CONFIG1, M0_CONFIG1, and ODIV0_CONFIG1
0
0
Configuration 2: D0_CONFIG2, M0_CONFIG2, and ODIV0_CONFIG2
0
1
Configuration 3: D0_CONFIG3, M0_CONFIG3, and ODIV0_CONFIG3
MODE2 - I2C Programming Mode
In this mode, GIN0, GIN1, GIN3 and GIN5 become SDAT (I2C data), SCLK (I2C clock), SUSPEND and CLK_SEL signal pins, respectively. The output GOUT0
will become an indicator for loss of PLL lock (LOSS_LOCK). GOUT1 pin will become an indicator for loss of the selected clock (LOSS_CLKIN). GIN2 and GIN4
are not available to users.
To enter this mode, I2C_MFC pin must be set HIGH.
Multi-Purpose pins
GIN0
GIN1
Manual Frequency Control modes
Mode1
I2C
GIN0
SDAT
GIN1
SCLK
NOTE:
1. The PLL(s) will lock onto the primary clock and the manual switchover can be controlled
by the PRIMCLK bit.
13
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Understanding the GIN Signals
During power up, the part will virtually be in MFC mode2, therefore, the values of GIN1 and GIN0 will be latched and used for PLL configuration selection,
regardless of the state of the I2C_MFC pin. This means that when in programming mode, the PLL configuration can only be changed by writing directly to the
registers of the currently selected configuration. When in MFC mode, configuration 0 or 1 should be selected if you do not want to change configurations when
entering or leaving programming mode. The GIN pins should be held LOW during power up to select configuration0 as default.
When not in programming mode, the GIN inputs directly control the selected configuration. The internal GINx signals can be individually disabled via
programming the GINEN bits (0x06). When disabled by setting GINENx to "0", the GINx inputs may be left floating, but during power up, the GIN pins will still
latch. Disabled inputs are interpreted as LOW by the internal state machines. Even if disabled, GIN1 and GIN0 pins will be enabled if required for I2C_MFC
programming functions when in programming mode.
SHUTDOWN/SUSPEND/ENABLE OF OUTPUTS
There are two external pins along with internal bits that control the enabling/disabling of the output banks. The SHUTDOWN/SUSPEND/OE pin, along with
the internal bits, control the enabling and disabling of the output bank and PLLs. This pin can be programmed to function as an output enable, PLL power down,
or global shutdown. The polarity of the SHUTDOWN/OE signal pin can be programmed to be either active HIGH or LOW with the SP bit (0x1C). When SP
is "0", the pin becomes active HIGH and when SP is "1", the pin becomes active LOW. The SH bit(0x1C) determines the function of the SHUTDOWN/OE
signal pin. If SH is "1", the signal pin is SHUTDOWN and functions as a global shutdown. This will override the OEx (0x1C), OSx (0x1D), and PLLSx (0x1E)
bits. If SH is "0", the signal pin is OE and functions as an enable/disable of the output banks. If used as an output enable/disable, each output bank can be individually
programmed to be enabled or disabled by the OE pin.by setting OEx bits to "1". If the OE signal pin is asserted, the output banks that has their corresponding
OEx bit set to "1" will be disabled. The OEMx bits determine the outputs' disable state. When set to "0x" the outputs will be tristated. When set to "10", the outputs
will be pulled low. When set to "11", the outputs will be pulled high. Inverted outputs will be parked in the opposite state. If the OEx bits are set to "0", the states
of the corresponding output banks will not be impacted by the state of the OE pin. To individually enable/disable via programming instead of the OE pin, hard
wire the OE pin to Vdd or GND (depending if it is active HIGH or LOW) as if to disable the outputs. Then toggle the OEx bits to either "0" to enable or "1" to
disable.
When the chip is in shutdown, the outputs, the reference oscillator, and the I2C_MFC pin are powered down. The outputs will be tristated and the I2C_MFC
pin will be set to MFC mode (MID level). Programming will not be allowed. The GINx pins and clock inputs remain operational. The PLL is not disabled. The
SHUTDOWN pin must be deasserted in order to program the part or to resume operation.
The SUSPEND function can be used to power down the PLL and/or output banks. Each output bank can be individually programmed to be enabled or
disabled by the SUSPEND signal pin by setting the OSx bits to "1". If the SUSPEND signal pin is asserted, the output banks that has their corresponding OSx
bit set to "1" will be powered down and outputs tristated. If the OSx bits are set to "0", the states of the corresponding output banks will not be impacted by the
state of the SUSPEND pin. There is also an option to suspend individual PLLs by setting the PLLSx bits (0x1E) to "1". This will associate the PLL to the SUSPEND
pin. When the pin is asserted, the corresponding PLLs will be powered down. It will not only power down the PLL but also any output bank associated with
it. The PLLSx bits will override the OSx bits.
In the event of a PLL suspend, the PLL must achieve lock again after it has been re-enabled, In the event of a global shutdown, the PLL does not have
to re-acquire lock since it is not disabled.
14
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
MANUAL FREQUENCY CONTROL (MFC) BLOCK DIAGRAM
OUTPUT MUX
PLL0
Prescaler "D"
CONFIG0
CONFIG1
VCO
Output Divider P2
CONFIG2
CONFIG3
CONFIG0
CONFIG1
Multiplier "M"
CONFIG0
ODIV
CONFIG1
ODIV
CONFIG2
ODIV
CONFIG3
ODIV
ODIV
Output Divider P3
CONFIG0
CONFIG1
ODIV
MFC = MODE
NOTES:
This illustration shows how the configurations are arranged for each PLL. There is an ODIV bit associated with each of the four configurations.
- GIN0 and GIN1 control four configurations from PLL0.
- ODIV from each configuration determines the selection of two Output Divider Px Configurations.
15
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
BLOCK DIAGRAM FOR SHUTDOWN/OE CONTROL SIGNAL
OUT1
PM2
OE1
01
10
/2
Q2
OUT2
/2
11
+2
OE2
OUT3
MUX
01
10
/2
Q3
/2
11
+2
OUT3
PM3
OE3
PM4
01
10
/2
Q4
OUT4
/2
11
+2
OE4
OE MODE
SHUTDOWN/OE
Global SHUTDOWN Mode:
Assert to Shutdown power on the outputs
and 3-Level Pin
SP
SH
NOTE:
This illustration shows the internal logic behind the SHUTDOWN/OE pin and the bits associated with it.
16
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
POWER UP AND POWER SAVING FEATURES
If a global shutdown is enabled, SHUTDOWN/SUSPEND/OE pin asserted, most of the chip except for the PLLs will be powered down. In order to have a
complete power down of the chip, the PLLs must be powered down via the SUSPEND function or by setting the pre-scaler bits to '0x00' and disable the internal
GINx signals via the enable bits at memory address 0x05. Note that the register bits will not lose their state in the event of a chip power-down. The only possibility
that the register bits will lose their state is if the part was power-cycled. After coming out of shutdown mode, the PLLs will require time to relock.
During power up, the values of GIN1 and GIN0 will be latched and used for PLL configuration selection, regardless of the state of the I2C_MFC pin and GINx
being disabled via the GINENx bits. The GIN pins should be held LOW during power up to select configuration0 as default. The output levels will be at an undefined
state during power up.
The post-divider should never be disabled via PM bits after power up, or else it will render the output bank completely non-functional during normal operation,
(unless the output bank itself will not be used at all).
During power up, the VDD ramp must be monotonic.
CLOCK SWITCH MATRIX AND OUTPUTS
All three PLL outputs and the currently selected input clock source are routed into and through a clock matrix. The user is able to select which PLL output and
clock source is routed to which output bank via the SRCx bits (0x34, 0x35). Each output bank has its own set of SRC bits. Refer to the RAM table for more
information. Note that OUT1 will be based off the reference clock and the only output bank toggling under the default RAM bit settings.
Outputs 1, 2 and 4 are 3.3V LVTTL. Outputs bank 3 can be 3.3V LVTTL, LVPECL or LVDS. The LVDS and LVPECL selection is determined by the LVLx
bits (0x54, 0x58). Each output bank has individual slew-rate control (SLEWx bits). Each output can be individually inverted (INVx bits); when using LVPECL
or LVDS modes, one of the outputs in each LVPECL/LVDS pair should be inverted. All output banks except OUT1 have a programmable 10-bit post-divider
(Qx bits) with two selectable divide configurations via the ODIVx bits.
There are four settings for the programmable slew rate, 0.7V/ns, 1.25V/ns, 2V/ns, and 2.75V/ns; this only applies to the 3.3V LVTTL outputs. The differential
outputs are not slew rate programmable in LVPECL or LVDS modes. SLEW3 must be set to 2.75V/ns for stable output operation . For LVTTL output frequency
rates higher than 100MHz, a slew rate of 2V/ns or greater should be selected. Each output can also be enabled/disabled, which is described in the 'SHUTDOWN/
SUSPEND/ENABLE of OUTPUTS' section. Refer to the RAM table for all binary settings.
HIGH LEVEL BLOCK DIAGRAM FOR CONFIGURATION SCHEME
I/Os
I/Os
Non-Volatile
Configuration
PLLs and Control
Blocks
Volatile
Configuration
I 2 C interface
Programming
Interface Block
NOTE: Diagram does not represent actual number of die on chip.
17
EEPROM
Cell
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PROGRAMMING THE DEVICE
I2C may be used to program the 5V9882T. The I2C_MFC pin selects the I2C when HIGH.
Hardwired Parameters for the IDT5V9882T
Device (slave) address = 7'b1101010
ID Byte for the 5V9882T = 8'b00010000
I2C PROGRAMMING
The 5v9882T is programmed through an I2C-Bus serial interface, and is an I2C slave device. The read and write transfer formats are supported. The first
byte of data after a write frame to the correct slave address is interpreted as the register address; this address auto-increments after each byte written or read.
The frame formats are shown below.
SDA
SDA
SCL
SCL
P
S
Data Frame
Data is stable during
clock HIGH
Start
Condition
Stop
Condition
Figure 1: Framing
Each frame starts with a "Start Condition" and ends with an "End Condition". These are both generated by the Master device.
MSB
1
LSB
1
0
1
0
1
0
R/W
7-bit slave address
R/W
0 - Slave will be written by master
1 - Slave will be read by master
ACK from Slave
The first byte transmitted by the Master is the Slave Address followed by the R/W bit.
The Slave acknowledges by sending a "1" bit.
Figure 2: First Byte Transmittetd on I2C Bus
18
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
EXTERNAL I2C INTERFACE CONDITION
KEY:
From Master to Slave
1234
1234
1234 From Master to Slave, but can be omitted if followed by the correct sequence
Normally data transfer is terminated by a STOP condition generated by the Master. However, if the Master still wishes to communicate on the bus, it can
generate a repeated START condition, and address another Slave address without first generating a STOP condition.
From Slave to Master
SYMBOLS:
ACK - Acknowledge (SDA LOW)
NACK - Not Acknowledge (SDA HIGH)
Sr - Repeated Start Condition
S - START Condition
P - STOP Condition
PROGWRITE
S
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits: xxxxxx00
1-bit
Register
ACK
8-bits
1-bit
Data ACK
8-bits
P
1-bit
Figure 3: Progwrite Command Frame
Writes can continue as long as a Stop condition is not sent and each byte will increment the register address.
PROGREAD
Note: If the expected read command is not from the next higher register to the previous read or write command, then set a known "read" register address
prior to a read operation by issuing the following command:
S
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits: xxxxxx00
Register
ACK
8-bits
1-bit
1-bit
P
Figure 4a: Prior to Progread Command Set Register Address
The user can ignore the STOP condition above and use a repeated START condition instead, straight after the slave acknowledgement bit (i.e., followed by
the Progread command):
Sr Address
7-bits
R/W
ACK
ID Byte
1
1-bit
8 bits
ACK Data_1 ACK Data_2 ACK Data_last NACK P
1-bit
8-bits
1-bit
8-bits
1-bit
8-bits
1-bit
Figure 4b: Progread Command Frame
Note: Figure 4b above by itself is the Progread command format. The ID byte for the 5V9882T is 10hex. Each byte recieved increments the register address.
19
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PROGSAVE
S
PROGRESTORE
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits:xxxxxx01
S
P
1-bit
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits:xxxxxx10
P
1-bit
NOTE:
PROGWRITE is for writing to the 5v9882T registers.
PROGREAD is for reading the 5v9882T registers.
PROGSAVE is for saving all the contents of the 5v9882T registers to the EEPROM.
PROGRESTORE is for loading the entire EEPROM contents to the 5v9882T registers.
EEPROM INTERFACE
The IDT5V9882T can also store its configuration in an internal EEPROM. The contents of the device's internal programming registers can be saved to the
EEPROM by issuing a save instruction (ProgSave) and can be loaded back to the internal programming registers by issuing a restore instruction (ProgRestore).
To initiate a save or restore using I2C, only two bytes are transferred. The Device Address is issued with the read/write bit set to "0", followed by the appropriate
command code. The save or restore instruction executes after the STOP condition is issued by the Master, during which time the IDT5V9882T will not generate
Acknowledge bits. The 5V9882T will acknowledge the instructions after it has completed execution of them. During that time, the I2C bus should be interpreted
as busy by all other users of the bus.
In order for the save and restore instructions to function properly, the IDT5V9882T must not be in shutdown mode (SHUTDOWN pin asserted). In the event
of an interrupt of some sort such as a power down of the part in the middle of a save or restore operation, the contents to or from the EEPROM will be partially
loaded, and a CRC error will be generated. The CERR bit (0x81) will be asserted to indicate that an error has occurred. The LOSS_LOCK signal will also
be asserted.
On power-up of the IDT5V9882T, an automatic restore is performed to load the EEPROM contents into the internal programming registers. The auto-restore
will not function properly if the device is in shutdown mode (SHUTDOWN pin asserted). The IDT5V9882T will be ready to accept a programming instruction
once it acknowledges its 7-bit I2C address.
20
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
I2C BUS DC CHARACTERISTICS
Symbol
VIH
VIL
VHYS
I IN
VOL
Parameter
Input HIGH Level
Input LOW Level
Hysteresis of Inputs
Input Leakage Current
Output LOW Voltage
Conditions
Min
0.7 * VDD
Typ
Max
0.3 * VDD
0.05 * VDD
±1.0
0.4
IOL = 3 mA
Unit
V
V
V
μA
V
I2C BUS AC CHARACTERISTICS FOR STANDARD MODE
Symbol
FSCLK
Parameter
Min
Serial Clock Frequency (SCLK)
Typ
0
Max
Unit
100
KHz
Bus free time between STOP and START
4.7
μs
tSU:START
Setup Time, START
4.7
μs
tHD:START
Hold Time, START
4
μs
tSU:DATA
Setup Time, data input (SDAT)
250
ns
tHD:DATA
Hold Time, data input (SDAT)(1)
0
tBUF
μs
Output data valid from clock
Capacitive Load for Each Bus Line
3.45
400
μs
pF
tR
Rise Time, data and clock (SDAT, SCLK)
1000
ns
tF
Fall Time, data and clock (SDAT, SCLK)
tOVD
CB
300
ns
tHIGH
HIGH Time, clock (SCLK)
4
μs
tLOW
LOW Time, clock (SCLK)
4.7
μs
4
μs
tSU:STOP
Setup Time, STOP
NOTE:
1. A device must internally provide a hold time of at least 300ns for the SDAT signal (referred to the VIHMIN of the SCLK signal) to bridge the undefined region of the falling edge
of SCLK.
I2C BUS AC CHARACTERISTICS FOR FAST MODE
Symbol
FSCLK
Parameter
Min
Serial Clock Frequency (SCLK)
0
Typ
Max
Unit
400
KHz
Bus free time between STOP and START
1.3
μs
tSU:START
Setup Time, START
0.6
μs
tHD:START
Hold Time, START
0.6
μs
tSU:DATA
Setup Time, data input (SDAT)
100
ns
tHD:DATA
Hold Time, data input (SDAT)(1)
0
tBUF
tOVD
CB
Output data valid from clock
Capacitive Load for Each Bus Line
μs
0.9
400
μs
pF
ns
tR
Rise Time, data and clock (SDAT, SCLK)
20 + 0.1 * CB
300
tF
Fall Time, data and clock (SDAT, SCLK)
20 + 0.1 * CB
300
ns
tHIGH
HIGH Time, clock (SCLK)
0.6
μs
tLOW
LOW Time, clock (SCLK)
1.3
μs
Setup Time, STOP
0.6
μs
tSU:STOP
NOTE:
1. A device must internally provide a hold time of at least 300ns for the SDAT signal (referred to the VIHMIN of the SCLK signal) to bridge the undefined region of the falling edge
of SCLK.
21
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Description
Max
Unit
VDD
Internal Power Supply Voltage
-0.5 to +4.6
V
VI
Input Voltage
-0.5 to +4.6
V
(2)
VO
Output Voltage
-0.5 to VDD + 0.5
V
TJ
Junction Temperature
150
°C
TSTG
Storage Temperature
–65 to +150
°C
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. Not to exceed 4.6V.
CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V)(1)
Symbol
CIN
Parameter
Min.
Typ.
Max.
Unit
Input Capacitance
—
4
—
pF
Crystal Specifications
XTAL_FREQ
Crystal Frequency
8
—
50
MHz
XTAL_MIN
Minimum Crystal Load Capacitance
—
3.5
—
pF
XTAL_MAX
Maximum Crystal Load Capacitance
—
35.4
—
pF
Crystal Load Capacitance Resolution
—
0.125
—
Voltage Swing (peak-to-peak, nominal)
—
2.3
—
XTAL_VPP
V
NOTE:
1. Capacitance levels characterized but not tested.
RECOMMENDED OPERATING CONDITIONS
Symbol
VDD
TA
CLOAD_OUT
FIN
tPU
Description
Power Supply Voltage for LVTTL
Power Supply Voltage for LVDS/LVPECL
Operating Temperature, Ambient
Maximum Load Capacitance (LVTTL only)
External Reference Crystal
External Reference Clock, Industrial
Power-up time for all VDDs to reach minimum specified voltage
(power ramps must be monotonic)
Min.
3
3.135
–40
—
8
1
0.05
22
Typ.
3.3
3.3
—
—
—
—
—
Max.
3.6
3.465
+85
15
50
400
5
Unit
V
°C
pF
MHz
ms
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol
VIHH
VIMM
VILL
Parameter
Input HIGH Voltage Level(1)
Input MID Voltage Level(1)
Input LOW Voltage Level(1)
I3
3-Level Input DC Current
IDD
Total Power Supply Current
(3.3V Supply, VDD)
Total Power Supply Current in
Shutdown Mode(2)
IDDS
Test Conditions
I2C_MFC 3-Level Input
I2C_MFC 3-Level Input
I2C_MFC 3-Level Input
HIGH Level
VIN = VDD
VIN = VDD/2
MID Level
VIN = GND
LOW Level
2 outputs @166MHz; 4 outputs @ 83MHz
2 outputs @20MHz; 4 outputs @ 40MHz
Global Shutdown Mode
(PLLs, dividers, outputs, etc. powered down)
Min.
VDD – 0.4
VDD/2 – 0.2
—
—
–50
–200
—
—
—
Typ.
—
—
—
—
—
—
120
40
2
Max.
—
VDD/2 + 0.2
0.4
200
+50
—
—
—
—
Unit
V
V
V
μA
mA
mA
NOTES:
1. These inputs are normally wired to VDD, GND, or left floating. If these inputs are switched dynamically after powerup, the function and timing of the outputs may be glitched, and
the PLL may require additional tAQ time before all datasheet limits are achieved.
2. Dividers must reload reprogrammed values via power-on reset or terminal count reload in order to ensure low-power mode.
DC ELECTRICAL CHARACTERISTICS FOR 3.3V LVTTL(1)
Symbol
IOH
IOL
VIH
VIL
IIH
IIL
IOZD
Parameter
Output HIGH Current
Output LOW Current
Input Voltage HIGH
Input Voltage LOW
Input HIGH Current
Input LOW Current
Output Leakage Current
Test Conditions
VOH = VDD - 0.5, VDD = 3.3V ± 0.3V
VOL = 0.5V, VDD = 3.3V ± 0.3V
Typ.
24
24
—
—
—
—
—
Max.
—
—
—
0.8
10
10
10
Unit
mA
mA
V
V
μA
μA
μA
Test Conditions
REF = LOW
Outputs enabled, All outputs unloaded
VDD = Max., CL = 0pF
Typ.
6
Max
12
Unit
mA
40
60
μA/MHz
FREFERENCE CLOCK = 33MHz, CL = 15pf
26
40
FREFERENCE CLOCK = 133MHz, CL = 15pf
FREFERENCE CLOCK = 200MHz, CL = 15pf
80
112
120
170
VIN = VDD
VIN = 0V
3-state outputs
Min.
12
12
2
—
—
—
—
NOTE:
1. See RECOMMENDED OPERATING RANGE table.
POWER SUPPLY CHARACTERISTICS FOR LVTTL OUTPUTS
Symbol
IDDQ
IDDD
ITOT
Parameter
Quiescent VDD Power Supply Current
Dynamic VDD Power Supply
Current per Output
Total Power VDD Supply Current
23
mA
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS FOR LVDS
Symbol
VOT (+)
VOT (-)
Δ VOT
VOS
Δ VOS
IOS
IOSD
Parameter
Differential Output Voltage for the TRUE binary state
Differential Output Voltage for the FALSE binary state
Change in VOT between Complimentary Output States
Output Common Mode Voltage (Offset Voltage)
Change in VOS between Complimentary Output States
Outputs Short Circuit Current, VOUT+ or VOUT- = 0V or VDD
Differential Outputs Short Circuit Current, VOUT+ = VOUT-
Min.
247
-247
—
1.125
—
—
—
Typ.
—
—
—
1.2
—
9
6
Max
454
-454
50
1.375
50
24
12
Unit
mV
mV
mV
V
mV
mA
mA
Typ.
68
Max
90
Unit
mA
30
45
μA/MHz
FREFERENCE CLOCK = 100MHz, CL = 5pf
86
130
FREFERENCE CLOCK = 200MHz, CL = 5pf
FREFERENCE CLOCK = 400MHz, CL = 5pf
100
122
150
190
mA
Typ.
—
—
—
Max
VDD - 0.9
VDD - 1.61
0.93
Unit
V
V
V
POWER SUPPLY CHARACTERISTICS FOR LVDS OUTPUTS(1)
Symbol
IDDQ
Parameter
Quiescent VDD Power Supply Current
IDDD
Dynamic VDD Power Supply
Current per Output
ITOT
Total Power VDD Supply Current
Test Conditions(2)
REF = LOW
Outputs enabled, All outputs unloaded
VDD = Max., CL = 0pF
NOTES:
1. Output banks 4 and 5 are toggling. Other output banks are powered down.
2. The termination resistors are excluded from these measurements.
DC ELECTRICAL CHARACTERISTICS FOR LVPECL
Symbol
VOH
VOL
VSWING
Parameter
Output Voltage HIGH, terminated through 50Ωtied to VDD - 2V
Output Voltage LOW, terminated through 50Ωtied to VDD - 2V
Peak to Peak Output Voltage Swing
Min.
VDD - 1.2
VDD - 1.95
0.55
POWER SUPPLY CHARACTERISTICS FOR LVPECL OUTPUTS(1)
Symbol
IDDQ
IDDD
ITOT
Parameter
Quiescent VDD Power Supply Current
Dynamic VDD Power Supply
Current per Output
Total Power VDD Supply Current
Test Conditions(2)
REF = LOW
Outputs enabled, All outputs unloaded
VDD = Max., CL = 0pF
Typ.
86
Max
110
Unit
mA
35
50
μA/MHz
FREFERENCE CLOCK = 100MHz, CL = 5pf
120
180
FREFERENCE CLOCK = 200MHz, CL = 5pf
FREFERENCE CLOCK = 400MHz, CL = 5pf
130
140
190
210
NOTES:
1. Output banks 4 and 5 are toggling. Other output banks are powered down.
2. The termination resistors are excluded from these measurements.
24
mA
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
AC TIMING ELECTRICAL CHARACTERISTICS
(SPREAD SPECTRUM GENERATION = OFF)
Symbol
fIN
1/t1
Parameter
Input Frequency
Output Frequency
fVCO
fPFD
fBW
t2
VCO Frequency
PFD Frequency
Loop Bandwidth
Input Duty Cycle
t3
Output Duty Cycle
t6
Slew Rate
SLEWx(bits) = 00
Slew Rate
SLEWx(bits) = 01
Slew Rate
SLEWx(bits) = 10
Slew Rate
SLEWx(bits) = 11
Rise Times
Fall Times
Rise Times
Fall Times
Output three-state Timing
t7
Clock Jitter(3,7)
t8
Output Skew(8)
t9
t10
Lock Time
Lock time(9)
t4(2)
t5
Test Conditions
Input Frequency Limit
Single Ended Clock output limit (LVTTL)
Differential Clock output limit (LVPECL/ LVDS)
VCO operating Frequency Range
PFD operating Frequency Range
Based on loop filter resistor and capacitor values
Duty Cycle for Input
Measured at VDD/2, FOUT ≤200MHz
Measured at VDD/2, FOUT > 200MHz
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
LVDS, 20% to 80%
Min.
1(1)
0.0049
0.0049
10
0.35(1)
0.03
40
Typ.
—
—
—
—
—
—
—
Max
400
200
500
1200
400
40
60
Unit
MHz
MHz
45
40
—
—
—
2.75
55
60
—
%
—
2
—
MHz
MHz
MHz
%
V/ns
LVPECL, 20% to 80%
Time for output to enter or leave three-state mode
after SHUTDOWN/OE switches
Peak-to-peak period jitter,
fPFD > 20MHz
CLK outputs measured at VDD/2
fPFD < 20MHz
Skew between output to output on the same bank
(bank 4 and bank 5 only)(4, 5)
PLL Lock Time from Power-up(6)
PLL Lock time from shutdown mode
—
1.25
—
—
0.75
—
—
—
—
—
—
850
850
500
500
—
ns
—
—
—
—
200
—
—
—
—
—
150 +
1/FOUTX
150
—
150
—
—
10
20
20
100
ms
μs
ps
ps
ps
NOTES:
1. Practical lower input frequency is determined by loop filter settings.
2. A slew rate of 2V/ns or greater should be selected for output frequencies of 100MHz and higher.
3. Input frequency is the same as the output with all output banks running at the same frequency.
4. Skew measured between all output pairs under identical input and output interfaces, same PLL and PLL multiplication and post divider value, transitions and load conditions
on any one device.
5. Skew measured between the cross points of all differential output pairs under identical input and output interfaces, transitions and load conditions on any one device.
6. Includes loading the configuration bits from EEPROM to PLL registers. It does not include EEPROM programming/write time.
7. Guaranteed by design but not production tested.
8. Outputs are aligned upon device power-on. If an output divider ratio is changed (via programming or Manual Frequency Control), then outputs are no longer guaranteed to
be synchronized.
9. Actual PLL lock time depends on the loop configuration.
SPREAD SPECTRUM GENERATION SPECIFICATIONS
Symbol
fIN
fMOD
fSPREAD
Parameter
Input Frequency
Mod Freq
Spread Value
Description
Input Frequency Limit
Modulation Frequency
Amount of Spread Value (Programmable) - Down Spread
Amount of Spread Value (Programmable) - Center Spread
NOTE:
1. Practical lower input frequency is determined by loop filter settings.
25
Min.
1(1)
—
Typ.
Max
—
400
33
—
-0.5, -1, -2.5, -3.5, -4
-0.5 to +0.5
Unit
MHz
kHz
%fOUT
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND CONDITIONS(1)
VDD
0.1 F
CLKOUT
OUTPUTS
CLOAD
GND
NOTE:
1. All VDD pins must be tied together.
Test Circuits for DC Outputs
OTHER TERMINATION SCHEME (BLOCK DIAGRAM)
CLOAD
CLKOUT
OUTPUTS
CLKOUT
OUTPUTS
CLOAD
RLOAD
CLKOUT
CLOAD
GND
GND
LVDS: - 100Ω between differential outputs with 5pF
LVTTL: -15pF for each output
VDD-2V
RLOAD
CLOAD
CLKOUT
OUTPUTS
CLKOUT
CLOAD
GND
RLOAD
VDD-2V
LVPECL: - 50Ω to VDD-2V for each output with 5pF
26
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
ADDR
7
6
5
4
3
2
BIT #
1
0
Default
Register
Hex Value
7
6
5
4
3
2
1
0
DESCRIPTION
0x00
0x01
Read-Only
0x02
0x03
0x04
0
0
0
0
0
0
0
0
01
0x05
1
1
1
1
1
1
1
1
C3
0x06
0
0
1
1
0
0
0
0
30
0x07
0
0
0
0
0
0
0
0
00
0x08
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG0
IP0[2:0]_CONFIG0
RZ0[3:0]_CONFIG0
GINEN0 to GINEN5=GINx Pins Enable Bits, ("1"=Enable (Default), "0"=No Connect (Internal State will be "Low"));
GINEN1
GINEN0
Address 0x04, Bits[7:1] are reserved and should bet set to "0".
Address 0x05, Bits 7, 6 are reserved and should be set to "1'.
XDRV=crystal drive strength ("00" = 1.4V, "01" = 2.3V, "10"= 3.2V pk-pk swing typical, "11"=XTAL_IN with external clock-default); When
"11", XTALCAP[7:0] value must also be set to "0".
Bits 7,6, 3, 2, 1, 0 are reserved and should be set to "0"
XDRV[1:0]
XTAL load cap = 3.5pF+ (0.125 x XTALCAP[7:0]) , 3.5pF to 35.4pF; Each XTAL pin to GND;
(For example, "00000001"=0.125pF, "00000010"=0.25pF, "00000100"=0.5pF); Default = "00000000";
XTALCAP[7:0]
0x09
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG1
IP0[2:0]_CONFIG1
RZ0[3:0]_CONFIG1
0x0A
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG2
IP0[2:0]_CONFIG2
RZ0[3:0]_CONFIG2
0x0B
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG3
IP0[2:0]_CONFIG3
RZ0[3:0]_CONFIG3
0x0C
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG0
CZ0[3:0]_CONFIG0
0x0D
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG1
CZ0[3:0]_CONFIG1
0x0E
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG2
CZ0[3:0]_CONFIG2
0x0F
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG3
0x10
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG0
0x11
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG1
PLL0 INPUT DIVIDER D0 SETTING
0x12
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG2
PLL0 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x13
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG3
0x14
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG0
0x15
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG1
0x16
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG2
N0[7:0]_CONFIG3
PLL0 LOOP FILTER SETTING
Loop Filter Values for PLL0 - For 4 Configurations (Default value is '0');
CONFIG0 will be selected if GINx are disabled and operating in MFC mode
ODIV0_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated with
PLL0; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider;
Resistor = 0.3KΩ + RZ0[3:0] * 1KΩ, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...);
Zero capacitor = 6pF + CZ0[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...);
Pole capacitor = 1.3pF + CP0[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...)
Charge pump current = 5 * 2^IP0[2:0] μA, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
CZ0[3:0]_CONFIG3
PLL0 MULTIPLIER SETTING
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
0x17
0
0
0
0
0
0
0
0
00
0x18
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG0
N0[11:8]_CONFIG0
0x19
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG1
N0[11:8]_CONFIG1
0x1A
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG2
N0[11:8]_CONFIG2
0x1B
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG3
N0[11:8]_CONFIG3
0x1C
0
0
0
0
0
0
0
0
00
0x1D
0
1
0
0
0
0
0
0
40
SP
SH
OKC
OE4
OS4
OE3
OE2
OS3
OS2
N0[11:0]_CONFIGx - Part of PLL0 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
A0[3:0]_CONFIGx - Part of PLL0 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
SSC_OFFSET0[5:0] - Spread Spectrum Fractional Multiplier Offset Value. See Spread Spectrum Settings in register address range 0x600x67
Total Multiplier Value M0 = 2 * N0[11:0] + A0 + 1 + SS_OFFSET0 * 1/64
When A0[3:0] = 0 and spread spectrum disabled, M0= 2 * N0[11:0];
When A0[3:0] > 0 and spread spectrum disabled, M0 = 2 * N0[11:0] + A0 + 1;
(Note: A < N-1, i.e. valid M values are 2, 4, 6, 8, 9, 10, 11, 12, 13, ..., 4095 assuming within fPFD and fVCO spec);
OE1
OS1
SP=Shutdown/OE Polarity for SHUTDOWN/OE signal pin, ("0"= Active High (Default), "1"= Active Low);
OEx=Output Disable Function for OUTx, ("1"=OUTx disabled based on OE pin (Default for OUT2-6, Disable mode is defined by OEMx
bits), "0"= Outputs enabled and no association with OE pin (Default));
OSx=Output Power Suspend function for OUTx, ("1"=OUTx will be suspended on GIN3/SUSPEND pin (MFC="1"), "0"= Always Enabled
(Default));
PLLSx=Determines which PLLx to suspend when GIN3 is programmed to be used as SUSPEND, It suspends all the outputs associated
with that PLL, ("1"= suspends based on SUSPEND pin, "0"= PLL enabled and no association with SUSPEND pin (Default)); It over-rides
OSx bits;
SH=Determines the function of the SHUTDOWN/OE signal pin. ("1"=Global Shutdown; this over-rides OEx and OSx bits, "0"=Ouput
Enable/Disable (Default))
0x1E
0
0
0
0
0
0
0
0
00
PLLS2
PLLS1
PLLS0
OKC=clock OK count, "0"=8 cycles, "1"=1024 cycles (Default) of Input Clocks for Revertive Switchover Mode:
Address 0x1D, Bit 7; Address 0x1E, Bits [7:3] are reserved and should be set to "0"
27
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
BIT #
ADDR
7
6
5
4
3
2
1
0
Default
Register
Hex Value
0x1F
0
0
0
0
0
0
0
0
00
0x20
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG0
IP1[2:0]_CONFIG0
RZ1[3:0]_CONFIG0
0x21
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG1
IP1[2:0]_CONFIG1
RZ1[3:0]_CONFIG1
0x22
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG2
IP1[2:0]_CONFIG2
RZ1[3:0]_CONFIG2
0x23
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG3
IP1[2:0]_CONFIG3
RZ1[3:0]_CONFIG3
0x24
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG0
0x25
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG1
CZ1[3:0]_CONFIG1
0x26
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG2
CZ1[3:0]_CONFIG2
0x27
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG3
0x28
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG0
7
6
5
OEM1[1;0]
4
SLEW1[1:0]
3
2
1
0
DESCRIPTION
Configuring Output OUT1
INV1=Output Inversion for OUT1 ("0"= Non-Invert (Default), "1"=Invert);
SLEW1=Slew Rate Settings for OUT1 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM1= Output Enable Mode for OUT1 output, when used with OE1 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low,
"11"=Park High);
Address 0x1F, Bits 3, 1, 0 are reserved and should be set to "0"
INV1
PLL1 LOOP FILTER SETTING
CZ1[3:0]_CONFIG0
Loop Filter Values for PLL1 - For 4 Configurations (Default value is '0');
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
ODIV1_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated with
PLL1; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider;
Resistor = 0.3KΩ + RZ1[3:0] * 1KΩ, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...);
Zero capacitor = 6pF + CZ1[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...);
Pole capacitor = 1.3pF + CP1[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...)
Charge pump current = 5 * 2^IP1[2:0] μA, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
CZ1[3:0]_CONFIG3
0x29
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG1
PLL1 INPUT DIVIDER D1 SETTING
0x2A
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG2
PLL1 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x2B
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG3
0x2C
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG0
0x2D
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG1
0x2E
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG2
0x2F
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG3
0x30
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG0
N1[11:8]_CONFIG0
0x31
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG1
N1[11:8]_CONFIG1
0x32
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG2
N1[11:8]_CONFIG2
0x33
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG3
N1[11:8]_CONFIG3
0x34
0
1
0
0
0
1
1
0
46
0x35
0
1
0
1
0
1
0
1
55
PLL1 MULTIPLIER SETTING
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
SRC2[1:0]
SRC1[1:0]
SRC4[1:0]
N1[11:0]_CONFIGx - Part of PLL1 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
A1[3:0]_CONFIGx - Part of PLL1 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
SSC_OFFSET1[5:0] - Spread Spectrum Fractional Multiplier Offset Value. See Spread Spectrum Settings in register address range 0x680x6F
Total Multiplier Value M1 = 2 * N1[11:0] + A1 + 1 + SS_OFFSET1 * 1/64
When A1[3:0] = 0 and spread spectrum disabled, M1= 2 * N1[11:0];
When A1[3:0] > 0 and spread spectrum disabled, M1 = 2 * N1[11:0] + A1 + 1 ;
(Note: A < N-1, i.e. valid M values are 2, 4, 6, 8, 9, 10, 11, 12, 13, ..., 4095 assuming within fPFD and fVCO spec);
Bit [3:0] is reserved and should be set to "0".
SRCx[1:0]=Input Source Selection for Output Dividers "Qx" blocks ("00"=Selected Input CLK, "01"=PLL0, "10"=PLL1, "11"=PLL2);
Default on SRC1 is the selected input clock. Default on SRC2-6 is PLL0 which will be powered down.
SRC3[1:0]
0x36
Read-Only
0x37
0x38
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG0
IP2[2:0]_CONFIG0
RZ2[3:0]_CONFIG0
0x39
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG1
IP2[2:0]_CONFIG1
RZ2[3:0]_CONFIG1
0x3A
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG2
IP2[2:0]_CONFIG2
RZ2[3:0]_CONFIG2
0x3B
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG3
IP2[2:0]_CONFIG3
RZ2[3:0]_CONFIG3
0x3C
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG0
0x3D
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG1
CZ2[3:0]_CONFIG1
0x3E
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG2
CZ2[3:0]_CONFIG2
0x3F
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG3
CZ2[3:0]_CONFIG3
PLL2 LOOP FILTER SETTING
CZ2[3:0]_CONFIG0
28
Loop Filter Values for PLL2 - For 4 Configurations (Default value is '0');
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
ODIV2_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated with
PLL2; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider;
Resistor = 0.3KΩ + RZ2[3:0] * 1KΩ, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...);
Zero capacitor = 6pF + CZ2[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...);
Pole capacitor = 1.3pF + CP2[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...)
Charge pump current = 5 * 2^IP2[2:0] μA, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
BIT #
ADDR
7
6
5
4
3
2
1
0
Default
Register
Hex Value
0x40
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG0
0x41
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG1
PLL2 INPUT DIVIDER D2 SETTING
0x42
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG2
PLL2 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x43
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG3
0x44
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG0
0x45
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG1
0x46
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG2
0x47
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG3
7
6
5
4
3
2
1
0
DESCRIPTION
PLL2 MULTIPLIER SETTING
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
N2[11:0]_CONFIGx - Part of PLL2 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
0x48
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG0
0x49
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG1
0x4A
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG2
0x4B
0
0
0
0
0
0
0
0
00
0x4C
0
0
0
0
0
0
0
0
00
OEM2[1:0]
SLEW2[1:0]
Q2[1:0]_CONFIG1
PM2[1:0]_CONFIG1
Total Multiplier Value M2 = N2;
Bits [7:4] in addresses 0x48, 0x49, 0x4A, and 0x4B are reserved and should be set to "0"
N2[11:8]_CONFIG3
INV2
Q2[1:0]_CONFIG0
0x4D
1
0
1
1
1
0
1
1
BB
0x4E
0
0
0
0
0
0
0
0
00
Q2[9:2]_CONFIG0
0x4F
0
0
0
0
0
0
0
0
00
Q2[9:2]_CONFIG1
0x50
0
0
0
0
0
0
0
0
00
0x51
1
0
1
1
1
0
1
1
00
0x52
0
0
0
0
0
0
0
0
00
0x53
0
0
0
0
0
0
0
0
00
0x54
0
0
0
0
1
1
0
0
0C
OEM3[1:0]
SLEW3[1:0]
0x55
1
0
1
1
1
0
1
1
BB
Q3[1:0]_CONFIG1
PM3[1:0]_CONFIG1
0x56
0
0
0
0
0
0
0
0
00
Q3[9:2]_CONFIG0
0x57
0
0
0
0
0
0
0
0
00
Q3[9:2]_CONFIG1
0x58
0
0
0
0
1
1
0
0
08
OEM4[1:0]
SLEW4[1:0]
0x59
1
0
1
1
1
0
1
1
BB
Q4[1:0]_CONFIG1
PM4[1:0]_CONFIG1
0x5A
0
0
0
0
0
0
0
0
00
Q4[9:2]_CONFIG0
0x5B
0
0
0
0
0
0
0
0
00
Q4[9:2]_CONFIG1
0x5C
0
0
0
0
0
0
1
1
00
0x5D
1
0
1
1
1
0
1
1
00
0x5E
0
0
0
0
0
0
0
0
00
0x5F
0
0
0
0
0
0
0
0
00
PM2[1:0]_CONFIG0
Configuring Output OUT2
INV2=Output Inversion for OUT2 ("0"= Non-Invert (Default), "1"=Invert);
SLEW2=Slew Rate Settings for OUT2 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM2= Output Enable Mode for OUT2output, when used with OE2 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low,
"11"=Park High);
Q2[x:x]=Output Divider "Q2" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM2[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT2, PM2 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
Address 0x4C, Bits 3, 1, 0 are reserved and should be set to "0"
Reserved
INV3_1
LVL3[1:0]
INV3_0
Q3[1:0]_CONFIG0
PM3[1:0]_CONFIG0
Configuring Output OUT3
INV3_1=Output Inversion for /OUT3 ("0"= Invert , "1"=Non-Invert (Default));
INV3_0=Output Inversion for OUT3 ("0"= Invert , "1"=Non-Invert (Default));
SLEW3=Slew Rate Settings for OUT3 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM3= Output Enable Mode for OUT3 output, when used with OE3 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low,
"11"=Park High);
LVL3=Output IO Standard Selection, ("00"=LVTTL (Default), "01"=LVDS, "10"=LVPECL, "11"=Reserved);
Q3[x:x]=Output Divider "Q3" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM3[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT3, PM3 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
When using LVPECL or LVDS outputs, SLEW3 must be set to "00".
INV4_0
Q4[1:0]_CONFIG0
PM4[1:0]_CONFIG0
Configuring Output OUT4
INV4_1=Output Inversion for /OUT4 ("0"= Invert, "1"=Non-Invert (Default));
INV4_0=Output Inversion for OUT4 ("0"= Invert, "1"=Non-Invert (Default));
SLEW4=Slew Rate Settings for OUT4 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM4= Output Enable Mode for OUT4 output, when used with OE4 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low,
"11"=Park High);
Q4[x:x]=Output Divider "Q4" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM4[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT4, PM4 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
When using LVPECL or LVDS outputs, SLEW4 must be set to "00".
Reserved
29
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
BIT #
ADDR
7
6
5
4
3
2
1
0
Default
Register
Hex Value
0x60
0
0
0
0
0
0
0
0
00
0x61
0
0
0
0
0
0
0
0
00
0x62
0
0
0
0
0
0
0
0
00
SD0[3:0][1]
SD0[3:0][0]
0x63
0
0
0
0
0
0
0
0
00
SD0[3:0][3]
SD0[3:0][2]
0x64
0
0
0
0
0
0
0
0
00
SD0[3:0][5]
SD0[3:0][4]
0x65
0
0
0
0
0
0
0
0
00
SD0[3:0][7]
SD0[3:0][6]
0x66
0
0
0
0
0
0
0
0
00
SD0[3:0][9]
SD0[3:0][8]
0x67
0
0
0
0
0
0
0
0
00
SD0[3:0][11]
SD0[3:0][10]
0x68
0
0
0
0
0
0
0
0
00
TSSC1[3:0]
NSSC1[3:0]
0x69
0
0
0
0
0
0
0
0
00
0x6A
0
0
0
0
0
0
0
0
00
SD1[3:0][1]
SD1[3:0][0]
0x6B
0
0
0
0
0
0
0
0
00
SD1[3:0][3]
SD1[3:0][2]
0x6C
0
0
0
0
0
0
0
0
00
SD1[3:0][5]
SD1[3:0][4]
0x6D
0
0
0
0
0
0
0
0
00
SD1[3:0][7]
SD1[3:0][6]
0x6E
0
0
0
0
0
0
0
0
00
SD1[3:0][9]
SD1[3:0][8]
0x6F
0
0
0
0
0
0
0
0
00
SD1[3:0][11]
SD1[3:0][10]
7
6
5
4
TSSC0[3:0]
DITH0
3
2
1
0
DESCRIPTION
NSSC0[3:0]
SS_OFFSET0[5:0]
X2_0
SPREAD SPRECTRUM SETTINGS FOR PLL0
DITH1
SS_OFFSET0=SS Fractional Offset/ First Sample (Unsigned);
TSSC0=# of PFD Cycles Per SS Cycle Step, TSSC="0000" for SSC off (Default);
NSSC0=# of SS Samples to Use from SS Memory (Default is "0");
DITH0=LSB DITHER on Σ, ("1"=dither on, "0"=off (Default));
X2_0=ΣΔ output x2, ("1"=x2, "0"=normal (Default));
SD0=Delta-encoded samples (unsigned); Waveform start with SS_OFFSET0, then SS_OFFSET0+SD0[0], etc. (Default is "0");
SS_OFFSET1[5:0]
X2_1
SPREAD SPRECTRUM SETTINGS FOR PLL1
SS_OFFSET1=SS Fractional Offset/ First Sample (Unsigned);
TSSC1=# of PFD Cycles Per SS Cycle Step, TSSC="0000" for SSC off (Default);
NSSC1=# of SS Samples to Use from SS Memory (Default is "0");
DITH1=LSB DITHER on ΣΔ, ("1"=dither on, "0"=off (Default));
X2_1=ΣΔ output x2, ("1"=x2, "0"=off (Default));
SD1=Delta-encoded samples (unsigned); Waveform start with SS_OFFSET1, then SS_OFFSET1+SD1[0], etc. (Default is "0");
0x70
Read-Only
0x71
0x72
0x73
0x74
0x75
0x76
0x77
0x78
0x79
0x7A
0x7B
0x7C
0x7D
0x7E
0x7F
0x80
0x81
CRC error in EEPROM
CERR = CRC error bit indicator ("1`" = CRC error)
CERR
Read-Only
0x82
0x83
0x84
0x85
Read-Only
0x86
0x87
0x88
30
IDT5V9882T
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XXXXX
Device Type
XX
Package
X
Process
I
Industrial (-40°C to +85°C)
PGG
Thin Shrink Small Outline Package- Green
5V9882T 3.3V EEPROM Programmable Clock Generator
5V9882
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
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31
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