IDT IDT5V9955

IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
3.3V PROGRAMMABLE
SKEW DUAL PLL CLOCK
DRIVER TURBOCLOCK™ W
FEATURES:
•
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DESCRIPTION
Ref input is 5V tolerant
8 pairs of programmable skew outputs
Two separate A and B banks for individual control
Low skew: 185ps same pair, 250ps same bank, 350ps both
banks
Selectable positive or negative edge synchronization on each
bank: excellent for DSP applications
Synchronous output enable on each bank
Input frequency: 2MHz to 200MHz
Output frequency: 6MHz to 200MHz
3-level inputs for skew and PLL range control
3-level inputs for feedback divide selection multiply / divide
ratios of (1-6, 8, 10, 12) / (2, 4)
PLL bypass for DC testing
External feedback, internal loop filter
12mA balanced drive outputs
Low Jitter: <100ps cycle-to-cycle
Power-down mode on each bank
Lock indicator on each bank
Available in BGA package
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IDT5V9955
The IDT5V9955 is a high fanout 3.3V PLL based clock driver intended
for high performance computing and data-communications applications. A
key feature of the programmable skew is the ability of outputs to lead or lag
the REF input signal. The IDT5V9955 has sixteen programmable skew
outputs in eight banks of 2. The two separate PLLs allow the user to
independently control A and B banks. Skew is controlled by 3-level input
signals that may be hard-wired to appropriate HIGH-MID-LOW levels.
The feedback input allows divide-by-functionality from 1 to 12 through
the use of the xDS[1:0] inputs. This provides the user with frequency
multiplication from 1 to 12 without using divided outputs for feedback.
When the xsOE pin is held low, all the xbank outputs are synchronously
enabled. However, if xsOE is held high, all the xbank outputs except x2Q0
and x2Q1 are synchronously disabled. The xLOCK is high when the
xbank PLL has achieved phase lock.
Furthermore, when xPE is held high, all the outputs are synchronized
with the positive edge of the REF clock input. When xPE is held low, all the
xbank outputs are synchronized with the negative edge of REF. The
IDT5V9955 has LVTTL outputs with 12mA balanced drive outputs.
FUNCTIONAL BLOCK DIAGRAM
ALOCK
APE
AFS
REF
BPE
TEST
BFS
BPD
APD
BsOE
AsOE
3
3
3
PLL
3
/N
3
A1Q0
Skew
Select
A1Q1
3
3
ADS1:0
BDS1:0
A1F1:0
B1F1:0
Skew
Select
A2Q1
Skew
Select
A3Q1
A4Q0
Skew
Select
Skew
Select
3
3
B2F1:0
A2F1:0
Skew
Select
3
3
3
B3F1:0
A3F1:0
3
3
B4F1:0
A4F1:0
3
B2Q0
B2Q1
Skew
Select
3
3
B1Q0
B1Q1
3
3
A4Q1
3
3
3
3
A3Q0
PLL
/N
BFB
AFB
3
A2Q0
BLOCK
B3Q0
B3Q1
Skew
Select
B4Q0
B4Q1
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
JUNE 2002
1
c
2002
Integrated Device Technology, Inc.
DSC 5974/9
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
6
A3Q1
A4Q0
A4Q1
APE
APD
A4F1
A3F1
AFS
B2F1
B1F1
BDS1
BLOCK
BVDDQ
B1Q0
B1Q1
B2Q0
5
A3Q0
AGND
AGND
AGND
ASOE
A4F0
A3F0
AVDD
BGND
B2F0
B1F0
BDS0
BVDDQ
BGND
BGND
B2Q1
4
AGND
AGND
AGND
AVDDQ
AVDDQ
AVDDQ
AVDDQ
AVDDQ
TEST
BVDDQ
BVDDQ
BVDDQ
BVDDQ
BGND
BGND
BFB
3
AFB
AGND
AGND
AVDDQ
AVDDQ
AVDDQ
AVDDQ
REF
BVDDQ
BVDDQ
BVDDQ
BVDDQ
BVDDQ
BGND
BGND
BGND
2
A2Q1
AGND
AGND
AVDDQ
ADS0
A1F0
A2F0
AGND
BVDD
B3F0
B4F0
BSOE
BGND
BGND
BGND
B3Q0
1
A2Q0
A1Q1
A1Q0
AVDDQ
ALOCK
ADS1
A1F1
A2F1
BFS
B3F1
B4F1
BPD
BPE
B4Q1
B4Q0
B3Q1
G
H
J
K
L
M
N
P
R
T
A
B
C
E
D
F
FPBGA
TOP VIEW
96 BALL FPBGA PACKAGE ATTRIBUTES
1.5mm Max.
1.4mm Nom.
1.3mm Min.
0.8mm
6
5
4
TOP VIEW
3
2
1
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
1
2
3
5.5mm
4
5
6
13.5mm
2
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Description
Max
CAPACITANCE(TA = +25°C, f = 1MHz, VIN = 0V)
Unit
Parameter
CIN
VDDQ, VDD
Supply Voltage to Ground
–0.5 to +4.6
V
VI
DC Input Voltage
–0.5 to VDD+0.5
V
REF Input Voltage
–0.5 to +5.5
V
W
TSTG
Maximum Power
TA = 85°C
1.1
Dissipation
TA = 55°C
1.9
Storage Temperature Range
–65 to +150
INDUSTRIAL TEMPERATURE RANGE
Description
Input Capacitance
Typ.
Max.
Unit
REF
8
10
pF
Others
5
7
NOTE:
1. Capacitance applies to all inputs except TEST, xFS, xnF[1:0], and xDS[1:0].
°C
NOTE:
1. Stresses beyond those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. These are stress ratings 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 absolutemaximum-rated conditions for extended periods may affect device reliability.
PIN DESCRIPTION
Pin Name
Type
Description
REF
IN
Reference Clock Input
xFB
IN
Individual Feedback Inputs for A and B banks
TEST (1)
IN
When MID or HIGH, disables PLL for A and B banks (except for conditions of Note 1). REF goes to all outputs. Skew Selections (See
xsOE(1)
IN
xPE
IN
Control Summary Table) remain in effect. Set LOW for normal operation.
Individual Synchronous Output Enable for A and B banks. When HIGH, it stops clock outputs (except x2Q0 and x2Q1) in a LOW state
(for xPE = H) - x2Q0 and x2Q1 may be used as the feedback signal to maintain phase lock. When TEST is held at MID level and sOE
is HIGH, the nF[1:0] pins act as output disable controls for individual banks when xnF[1:0] = LL. Set xsOE LOW for normal operation
(has internal pull-down).
Individual Selectable positive or negative edge control for A and B banks. When LOW/HIGH the outputs are synchronized with the negative/
positive edge of the reference clock (has internal pull-up).
xnF[1:0]
IN
xFS
IN
3-level inputs for selecting 1 of 9 skew taps or frequency functions
Selects appropriate oscillator circuit based on anticipated frequency range. (See Programmable Skew Range.) Individual control on A
and B banks.
xnQ[1:0]
OUT
xDS[1:0]
IN
Eight banks of two outputs with programmable skew
3-level inputs for feedback divider selection for A and B banks
xPD
IN
Power down control. Shuts off either A or B bank of the chip when LOW (has internal pull-up).
xLOCK
OUT
VDDQ
PWR
Power supply for output buffers
VDD
PWR
Power supply for phase locked loop, lock output, and other internal circuitry
GND
PWR
Ground
PLL lock indication signal for A and B banks. HIGH indicates lock. LOW indicates that the PLL is not locked and outputs may not be
synchronized to the inputs.
NOTE:
1. When TEST = MID and xsOE = HIGH, PLL remains active with xnF[1:0] = LL functioning as an output disable control for individual output banks. Skew selections remain
in effect unless xnF[1:0] = LL.
3
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
PROGRAMMABLE SKEW
Output skew with respect to the REF input is adjustable to compensate
for PCB trace delays, backplane propagation delays or to accommodate
requirements for special timing relationships between clocked components. Skew is selectable as a multiple of a time unit (tU) which ranges
from 625ps to 1.3ns (see Programmable Skew Range and Resolution
Table). There are nine skew configurations available for each output
pair. These configurations are chosen by the xnF1:0 control pins. In
order to minimize the number of control pins, 3-level inputs (HIGH-MIDLOW) are used, they are intended for but not restricted to hard-wiring.
Undriven 3-level inputs default to the MID level. Where programmable
skew is not a requirement, the control pins can be left open for the zero
skew default setting. The Control Summary Table shows how to select
specific skew taps by using the xnF1:0 control pins.
EXTERNAL FEEDBACK
By providing two separate external feedbacks, the IDT5V9955 gives
users flexibility with regard to skew adjustment. The xFB signal is compared with the input REF signal at the phase detector in order to drive
the VCO. Phase differences cause the VCO of the PLL to adjust upwards or downwards accordingly.
An internal loop filter moderates the response of the VCO to the
phase detector. The loop filter transfer function has been chosen to
provide minimal jitter (or frequency variation) while still providing accurate responses to input frequency changes.
PROGRAMMABLE SKEW RANGE AND RESOLUTION TABLE
xFS = LOW
xFS = MID
xFS = HIGH
Timing Unit Calculation (tU)
1/(32 x FNOM)
1/(16 x FNOM)
1/(8 x FNOM)
VCO Frequency Range (FNOM)(1,2)
24 to 50MHz
48 to 100MHz
96 to 200MHz
±7.8125ns
±7.8125ns
±7.8125ns
Comments
Skew Adjustment Range(3)
Max Adjustment:
ns
±67.5°
±135°
±270°
Phase Degrees
±18.75%
±37.5%
±75%
% of Cycle Time
Example 1, FNOM = 25MHz
tU = 1.25ns
—
—
Example 2, FNOM = 37.5MHz
tU = 0.833ns
—
—
Example 3, FNOM = 50MHz
tU = 0.625ns
tU = 1.25ns
—
Example 4, FNOM = 75MHz
—
tU = 0.833ns
—
Example 5, FNOM = 100MHz
—
tU = 0.625ns
tU = 1.25ns
Example 6, FNOM = 150MHz
—
—
tU = 0.833ns
Example 7, FNOM = 200MHz
—
—
tU = 0.625ns
NOTES:
1. The device may be operated outside recommended frequency ranges without damage, but functional operation is not guaranteed.
2. The level to be set on xFS is determined by the nominal operating frequency of the VCO and Time Unit Generator. The VCO frequency always appears at x1Q1:0, x2Q1:0, and
the higher outputs when they are operated in their undivided modes. The frequency appearing at the REF and xFB inputs will be FNOM when the output connected to xFB is
undivided and xDS[1:0] = MM. The frequency of the REF and xFB inputs will be FNOM /2 or FNOM /4 when the part is configured for frequency multiplication by using a divided
output as the xFB input and setting xDS[1:0] = MM. Using the xDS[1:0] inputs allows a different method for frequency multiplication (see Divide Selection Table).
3. Skew adjustment range assumes that a zero skew output is used for feedback. If a skewed xQ output is used for feedback, then adjustment range will be greater. For example
if a 4tU skewed output is used for feedback, all other outputs will be skewed –4tU in addition to whatever skew value is programmed for those outputs. ‘Max adjustment’ range
applies to output pairs 3 and 4 where ± 6tU skew adjustment is possible and at the lowest FNOM value.
4
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
DIVIDE SELECTION TABLE
xDS [1:0]
xFB Divide-by-n
Permitted Output Divide-by-n connected to xFB(1)
LL
2
1 or 2
LM
3
1
LH
4
1, 2, or 4
ML
5
1 or 2
MM
1
1, 2, or 4
MH
6
1 or 2
HL
8
1 or 2
HM
10
1
HH
12
1
NOTE:
1. Permissible output division ratios connected to xFB. The frequency of the REF input will be FNOM/N when the part is configured for frequency multiplication by using an undivided
output for xFB and setting xDS[1:0] to N (N = 1-6, 8, 10, 12).
CONTROL SUMMARY TABLE FOR FEEDBACK SIGNALS
nF1:0
Skew (Pair #1, #2)
Skew (Pair #3)
Skew (Pair #4)
LL (1)
–4tU
Divide by 2
Divide by 2
LM
–3tU
–6tU
–6tU
LH
–2tU
–4tU
–4tU
ML
–1tU
–2tU
–2tU
MM
Zero Skew
Zero Skew
Zero Skew
MH
1tU
2tU
2tU
HL
2tU
4tU
4tU
HM
3tU
6tU
6tU
HH
4tU
Divide by 4
Inverted (2)
NOTES:
1. LL disables outputs if TEST = MID and xsOE = HIGH.
2. When pair #4 is set to HH (inverted), xsOE disables pair #4 HIGH when xPE = HIGH, xsOE disables pair #4 LOW when xPE = LOW.
RECOMMENDED OPERATING RANGE
Symbol
Description
VDD/VDDQ
Power Supply Voltage
TA
Ambient Operating Temperature
5
Min.
Typ.
Max.
Unit
3
3.3
3.6
V
-40
+25
+85
°C
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol
Parameter
Conditions(1)
Min.
Max.
Unit
2
—
V
—
0.8
V
VDD−0.6
—
V
VDD/2−0.3
VDD/2+0.3
V
VIH
Input HIGH Voltage
Guaranteed Logic HIGH (REF, xFB Inputs Only)
VIL
Input LOW Voltage
Guaranteed Logic LOW (REF, xFB Inputs Only)
VIHH
Input HIGH Voltage(2)
3-Level Inputs Only
VIMM
Input MID Voltage
3-Level Inputs Only
VILL
Input LOW Voltage
3-Level Inputs Only
—
0.6
V
IIN
Input Leakage Current
VIN = VDD or GND
−5
+5
µA
—
+400
−100
−400
−25
+100
—
µA
(2)
(2)
(REF, xFB Inputs Only)
I3
VDD = Max.
VIN = VDD
HIGH Level
3-Level Input DC Current
VIN = VDD/2
MID Level
LOW Level
µA
(TEST, xFS, xnF[1:0], xDS[1:0])
VIN = GND
IPU
Input Pull-Up Current (xPE, xPD)
VDD = Max., VIN = GND
IPD
Input Pull-Down Current (xsOE)
VDD = Max., VIN = VDD
—
+100
µA
VOH
Output HIGH Voltage
VDD = Min., IOH = −2mA (xLOCK Output)
2.4
—
V
2.4
—
VDDQ = Min., IOH = −12mA (xnQ[1:0] Outputs)
VOL
Output LOW Voltage
—
VDD = Min., IOL = 2mA (xLOCK Output)
—
0.4
VDDQ = Min., IOL = 12mA (xnQ[1:0] Outputs)
—
0.4
V
NOTES:
1. All conditions apply to A and B banks.
2. These inputs are normally wired to VDD, GND, or unconnected. Internal termination resistors bias unconnected inputs to VDD/2. If these inputs are switched, the function and timing
of the outputs may be glitched, and the PLL may require an additional tLOCK time before all datasheet limits are achieved.
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
IDDQ
Quiescent Power Supply Current
Test Conditions(1)
Typ.(2)
Max.
Unit
40
60
mA
—
50
µA
1
60
µA
xFS = L
190
290
xFS = M
150
230
xFS = H
130
200
VDD = Max., TEST = MID, REF = LOW,
xPE = LOW, xsOE = LOW, xPD = HIGH
xFS = MID, All outputs unloaded
IDDPD
Power Down Current
VDD = Max., PD = LOW, xsOE = LOW
xPE = HIGH, TEST = HIGH, xFS = HIGH
xnF[1:0] = HH, xDS[1:0] = HH
∆IDD
Power Supply Current per Input HIGH
VIN = 3V, VDD = Max., xPD = LOW, TEST = HIGH
(REF and xFB inputs only)
IDDD
ITOT
Dynamic Power Supply Current per Output
Total Power Supply Current
xFS = L, FVCO = 50MHz, CL = 0pF
112
—
xFS = M, FVCO = 100MHz, CL = 0pF
160
—
xFS = H, FVCO = 200MHz, CL = 0pF
250
—
NOTES:
1. Measurements are for divide-by-1 outputs, xnF[1:0] = MM, and xDS[1:0] = MM. All conditions apply to A and B banks.
2. For nominal voltage and temperature.
6
µA/MHz
mA
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
INPUT TIMING REQUIREMENTS
Description(1)
Symbol
Min.
Max.
Unit
—
10
ns/V
tR, tF
Maximum input rise and fall times, 0.8V to 2V
tPWC
Input clock pulse, HIGH or LOW
2
—
ns
DH
Input duty cycle
10
90
%
FREF
Reference clock input frequency
xFS = LOW
2
50
xFS = MID
4
100
xFS = HIGH
8
200
NOTE:
1. Where pulse width implied by DH is less than tPWC limit, tPWC limit applies.
7
MHz
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Symbol
Parameter
Min.
Typ.
Max.
Unit
FNOM
VCO Frequency Range
See Programmable Skew Range and Resolution Table
tRPWH
REF Pulse Width HIGH(1)
2
tRPWL
REF Pulse Width LOW
2
tU
(1)
Programmable Skew Time Unit
—
—
ns
—
—
ns
See Control Summary Table
tSKEWPR
Zero Output Matched-Pair Skew (xnQ0, xnQ1)(2,3)
—
50
185
ps
tSKEWB
Bank Skew(4)
—
0.1
0.35
ns
tSKEW0
Zero Output Skew (All Outputs from the same A or B bank)
—
0.1
0.25
ns
tSKEW1
Output Skew (Rise-Rise, Fall-Fall, Same Class Outputs)
—
0.1
0.25
ns
tSKEW2
Output Skew (Rise-Fall, Nominal-Inverted, Divided-Divided)(6)
—
0.2
0.5
ns
tSKEW3
Output Skew (Rise-Rise, Fall-Fall, Different Class Outputs)(6)
—
0.15
0.5
ns
tSKEW4
Output Skew (Rise-Fall, Nominal-Divided, Divided-Inverted)(2)
—
0.3
0.9
ns
—
—
0.75
ns
−0.25
−0.25
−0.5
−0.7
−1
−1
—
0.25
ns
—
0.25
ns
—
0.5
ns
—
0.7
ns
—
1
ns
0
1
ns
—
—
1.5
ns
(5)
(6)
tDEV
Device-to-Device Skew(2,7)
t(φ)1-3
Static Phase Offset (xFS = L, M, H) (FB Divide-by-n = 1, 2, 3)
t(φ)H
Static Phase Offset (xFS = H)(8)
t(φ)M
Static Phase Offset (xFS = M)
(8)
(8)
t(φ)L1-6
Static Phase Offset (xFS = L) (xFB Divide-by-n = 1, 2, 3, 4, 5, 6)(8)
t(φ)L8-12
Static Phase Offset (xFS = L) (xFB Divide-by-n = 8, 10, 12)
tODCV
Output Duty Cycle Variation from 50%
tPWH
Output HIGH Time Deviation from 50%(9)
(8)
tPWL
Output LOW Time Deviation from 50%
—
—
2
ns
tORISE
Output Rise Time
0.15
0.7
1.5
ns
tOFALL
Output Fall Time
0.15
0.7
1.5
ns
tLOCK
PLL Lock Time
ms
tCCJH
Cycle-to-Cycle Output Jitter (peak-to-peak)
(10)
(11,12)
—
—
0.5
—
—
100
—
—
150
—
—
150
—
—
200
—
—
300
(divide by 1 output frequency, xFS = H, FB divide-by-n=1,2)
tCCJHA
Cycle-to-Cycle Output Jitter (peak-to-peak)
(divide by 1 output frequency, xFS = H, FB divide-by-n=any)
tCCJM
Cycle-to-Cycle Output Jitter (peak-to-peak)
ps
(divide by 1 output frequency, xFS = M)
tCCJL
Cycle-to-Cycle Output Jitter (peak-to-peak)
(divide by 1 output frequency, xFS = L, FREF > 3MHz)
tCCJLA
Cycle-to-Cycle Output Jitter (peak-to-peak)
(divide by 1 output frequency, xFS = L, FREF < 3MHz)
NOTES:
1. Refer to Input Timing Requirements table for more detail.
2. Skew is the time between the earliest and the latest output transition among all outputs for which the same tU delay has been selected when all are loaded with the specified
load.
3. tSKEWPR is the skew between a pair of outputs (xnQ0 and xnQ1) when all sixteen outputs are selected for 0tU.
4. tSKEWB is the skew between outputs (xnQ0 and xnQ1) from A and B banks when they are selected for 0tU.
5. tSK(0) is the skew between outputs when they are selected for 0tU.
6. There are 3 classes of outputs: Nominal (multiple of tU delay), Inverted (x4Q0 and x4Q1 only with x4F0 = x4F1 = HIGH), and Divided (x3Q1:0 and x4Q1:0 only in Divideby-2 or Divide-by-4 mode). Test condition: xnF0:1=MM is set on unused outputs.
7. tDEV is the output-to-output skew between any two devices operating under the same conditions (VDDQ, VDD, ambient temperature, air flow, etc.)
8. tφ is measured with REF input rise and fall times (from 0.8V to 2V) of 0.5ns. Measured from 1.5V on REF to 1.5V on xFB.
8. Measured at 2V.
10. Measured at 0.8V.
11. tLOCK is the time that is required before synchronization is achieved. This specification is valid only after VDD/VDDQ is stable and within normal operating limits. This parameter
is measured from the application of a new signal or frequency at REF or xFB until tPD is within specified limits.
12. Lock detector may be unreliable for input frequencies less than approximately 4MHz, or for input signals which contain significant jitter.
8
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
AC TEST LOADS AND WAVEFORMS
VDDQ
150Ω
Output
Output
150Ω
20pF
For LOCK output
For all other outputs
tOFALL
tORISE
tPWH
2.0V
VTH = 1.5V
0.8V
tPWL
LVTTL Output Waveform
≤1ns
3.0V
2.0V
VTH = 1.5V
0.8V
0V
LVTTL Input Test Waveform
9
≤1ns
20pF
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
AC TIMING DIAGRAM
tRPWL
tREF
tRPWH
REF
t(φ)
tODCV
tODCV
FB
tCCJH, HA,
M, L, LA
Q
tSKEWPR,B
tSKEW0, 1
tSKEWPR,B
tSKEW0, 1
OTHER Q
tSKEW2
tSKEW2
INVERTED Q
tSKEW3, 4
tSKEW3, 4
tSKEW3, 4
REF DIVIDED BY 2
tSKEW1, 3, 4
tSKEW2, 4
REF DIVIDED BY 4
NOTES:
PE:
Skew:
The AC Timing Diagram applies to PE=VDD. For PE=GND, the negative edge of FB aligns with the negative edge of REF, divided outputs change on the negative edge
of REF, and the positive edges of the divide-by-2 and the divide-by-4 signals align.
The time between the earliest and the latest output transition among all outputs for which the same tU delay has been selected when all are loaded with 20pF and terminated
with 75Ω to VDDQ/2.
tSKEWPR:
The skew between a pair of outputs (xnQ0 and xnQ1) when all eight outputs are selected for 0tU.
tSKEWB:
The skew between outputs (xnQ0 and xnQ1) from A and B banks when they are selected for 0tU.
tSKEW0:
The skew between outputs when they are selected for 0tU.
tDEV:
The output-to-output skew between any two devices operating under the same conditions (VDDQ, VDD, ambient temperature, air flow, etc.)
tODCV:
The deviation of the output from a 50% duty cycle. Output pulse width variations are included in tSKEW2 and tSKEW4 specifications.
tPWH is measured at 2V.
tPWL is measured at 0.8V.
tORISE and tOFALL are measured between 0.8V and 2V.
tLOCK:
The time that is required before synchronization is achieved. This specification is valid only after VDD/VDDQ is stable and within normal operating limits. This parameter
is measured from the application of a new signal or frequency at REF or FB until tPD is within specified limits.
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IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
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5V9955
3.3V Programmable Skew Dual PLL Clock
Driver TurboClock W
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