TI CDCU2A877 1.8-v phase lock loop clock driver Datasheet

CDCU2A877
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1.8-V PHASE LOCK LOOP CLOCK DRIVER
FEATURES
•
•
•
•
•
•
•
•
1.8-V/1.9-V Phase Lock Loop Clock Driver for
Double Data Rate ( DDR II ) Applications
Spread Spectrum Clock Compatible
Operating Frequency: 125 MHz to 410 MHz
Application Frequency: 160 MHz to 410 MHz
Low Jitter (Cycle-Cycle): ±40 ps
Low Output Skew: 35 ps
Stabilization Time <6 µs
Distributes One Differential Clock Input to 10
Differential Outputs
•
•
•
•
•
High-Drive Version of CDCUA877
52-Ball mBGA (MicroStar Junior™ BGA,
0,65-mm pitch)
External Feedback Pins ( FBIN, FBIN ) are
Used to Synchronize the Outputs to the Input
Clocks
Meets or Exceeds CUA877/CUA878
Specification PLL Standard for
PC2-3200/4300/5300/6400
Fail-Safe Inputs
DESCRIPTION
The CDCU2A877 is a high-performance, low-jitter, low-skew, zero-delay buffer that distributes a differential clock
input pair (CK, CK) to 10 differential pairs of clock outputs (Yn, Yn) and to one differential pair of feedback clock
outputs (FBOUT, FBOUT). The clock outputs are controlled by the input clocks (CK, CK), the feedback clocks
(FBIN, FBIN), the LVCMOS control pins (OE, OS), and the analog power input (AVDD). When OE is low, the
clock outputs, except FBOUT/FBOUT, are disabled while the internal PLL continues to maintain its locked-in
frequency. OS (output select) is a program pin that must be tied to GND or VDD. When OS is high, OE functions
as previously described. When OS and OE are both low, OE has no affect on Y7/Y7, they are free running.
When AVDD is grounded, the PLL is turned off and bypassed for test purposes.
When both clock inputs (CK, CK) are logic low, the device enters in a low power mode. An input logic detection
circuit on the differential inputs, independent from input buffers, detects the logic low level and performs in a low
power state where all outputs, the feedback, and the PLL are off. When the clock inputs transition from being
logic low to being differential signals, the PLL turns back on, the inputs and the outputs are enabled, and the
PLL obtains phase lock between the feedback clock pair (FBIN, FBIN) and the clock input pair (CK, CK) within
the specified stabilization time.
The CDCU2A877 is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from
0°C to 70°C.
AVAILABLE OPTIONS
(1)
TA
52-Ball BGA (1)
0°C to 70°C
CDCU2A877ZQL
For the most current package and ordering information, see the
Package Option Addendum at the end of this document, or see the
TI website at www.ti.com.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
MicroStar Junior is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated
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Table 1. Terminal Functions
NAME
BGA
MLF
I/O
DESCRIPTION
AGND
G1
7
AVDD
H1
8
CK
E1
4
I
Clock input with a (10 kΩ to 100 kΩ) pulldown resistor
CK
F1
5
I
Complementary clock input with a (10 kΩ to 100 kΩ) pulldown resistor
FBIN
E6
27
I
Feedback clock input
FBIN
F6
26
I
Complementary feedback clock input
FBOUT
H6
24
O
Feedback clock output
FBOUT
G6
25
O
Complementary feedback clock output
OE
F5
22
I
Output enable (asynchronous)
OS
D5
21
I
Output select (tied to GND or VDD)
GND
B2, B3, B4,
B5, C2, C5,
H2, H5, J2, J3,
J4, J5
10
VDDQ
D2, D3, D4,
E2, E5, F2,
G2, G3, G4,
G5
1, 6, 9, 15, 20,
23, 28, 31, 36
Analog ground
Analog power
Ground
Logic and output power
Y[0:9]
A2, A1, D1,
38, 39, 3, 11, 14,
J1, K3, A5, A6, 34, 33, 29, 19, 16
D6, J6, K4
O
Clock outputs
Y[0:9]
A3, B1, C1,
37, 40, 2, 12, 13,
K1, K2, A4,
35, 32, 30, 18, 17
B6, C6, K6, K5
O
Complementary clock outputs
Table 2. Function Table
INPUTS
OUTPUTS
Y
PLL
AVDD
OE
OS
CK
CK
Y
FBOUT
FBOUT
GND
H
X
L
H
L
L
H
Bypassed/Off
GND
H
X
H
L
H
H
L
Bypassed/Off
GND
L
H
L
H
LZ
LZ
L
H
Bypassed/Off
GND
L
L
H
L
LZ
Y7 Active
LZ
Y7 Active
H
L
Bypassed/Off
1.8 V Nomnal
L
H
L
H
LZ
LZ
L
H
On
1.8 V Nomnal
L
L
H
L
LZ
Y7 Active
LZ
Y7 Active
H
L
On
1.8 V Nomnal
H
X
L
H
L
H
L
H
On
1.8 V Nomnal
H
X
H
L
H
L
H
L
On
1.8 V Nomnal
X
X
LH
L
LZ
LZ
LZ
LZ
Off
X
X
X
H
H
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Figure 1. Logic Diagram (Positive Logic)
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted) (1)
VALUE
UNIT
–0.5 tp 2.5
V
Input voltage range (2) (3)
–0.5 to VDDQ + 0.5
V
VO
Output voltage range (2) (3)
–0.5 to VDDQ + 0.5
V
IIK
Input clamp current, (VI < 0 or VI > VDDQ)
±50
mA
IOK
Output clamp voltage, (VO < 0 or VO > VDDQ)
±50
mA
IO
Continuous output current, (VO = 0 to VDDQ)
±50
mA
IDDC
Continuous current through each VDDQ or GND
±100
mA
VDDQ
AVDD
Supply voltage range
VI
RθJA
Thermal resistance, junction-to-ambient (4)
RθJC
Thermal resistance, junction-to-case (4)
Tstg
Storage temperature range
(1)
(2)
(3)
(4)
4
No airflow
151.9
Airllflow 150 ft/min
146.1
No airflow
102.4
–65 to 150
K/W
°C
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 beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
This value is limited to 2.5 V maximum.
The package thermal impedance is calculated in accordance with JESD51 and JEDEC2S1P (high-k board).
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RECOMMENDED OPERATING CONDITIONS
MIN
MAX
UNIT
1.8
1.9
V
0.35 × VDDQ
V
VDDQ
Output supply voltage
AVDD
Supply voltage (1)
VIL
Low-level input voltage (2)
OE, OS
VIH
High-level input
voltage (2)
CK, CK
IOH
High-level output current (see Figure 2)
–18
mA
IOL
Low-level output current (see Figure 2)
18
mA
VIX
Input differential-pair cross voltage
VI
Input voltage level
VID
Input differential voltage (2) (see Figure 4)
TA
Operating free-air temperature
(1)
(2)
1.7
NOM
VDDQ
0.65 × VDDQ
V
(VDDQ/2)-0.15
(VDDQ/2)+0.15
V
–0.3
VDDQ+0.3
V
DC
0.3
VDDQ+0.4
V
AC
0.6
VDDQ+0.4
V
0
70
°C
The PLL is turned off and bypassed for test purposes when AVDD is grounded. During this test mode, VDDQ remains within the
recommended operating conditions and no timing parameters are ensured.
VID is the magnitude of the difference between the input level on CK and the input level on CK, see Figure 4 for definition. The CK and
CK VIH and VIL limits define the dc low and high levels for the logic detect state.
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ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range
PARAMETERLow-level output voltage
VIK
Input (cl inputs)
VOH
High-level output voltage
TEST CONDITIONS
II = –18 mA
IOH = -100
Low-level output voltage
IO(DL)
Low-level output current, disabled
VOD
Differential output voltage (1)
II
Input current
A
1.7 V to
1.9 V
Input capacitance
CI(∆)
Change in input
current
(1)
(2)
1.7 V
MAX
UNIT
–1.2
V
VDDQ
– 0.2
V
1.1
0.1
V
IOL = 18 mA
1.7 V
0.6
VO(DL) = 100 mV, OE = L
1.7 V
100
µA
1.7 V
0.6
V
CK, CK
1.9 V
±250
OE, OS, FBIN, FBIN
1.9 V
±10
CK and CK = L
1.9 V
500
µA
CK and CK = 410 MHz,
All outputs are open
(not connected to a PCB)
1.9 V
300
mA
All outputs are loaded with 2 pF
and 120-Ω termination resistor,
CK and CK = 410 MHz
1.9 V
325
mA
CK, CK
VI = VDD or GND
1.8 V
2
3
FBIN, FBIN
VI = VDD or GND
1.8 V
2
3
CK, CK
VI = VDD or GND
1.8 V
0.25
FBIN, FBIN
VI = VDD or GND
1.8 V
0.25
Supply current, dynamic ( IDDQ + IADD) (see
for CPD calculation)
CI
TYP
IOL = 100 µA
IDD(LD) Supply current, static (IDDQ + IADD)
IDD
MIN
1.7 V
IOH = –18 mA
VOL
AVDD,
VDDG
(2)
µA
pF
pF
VOD is the magnitude of the difference between the true and complimentary outputs. See Figure 4 for a definition.
Total IDD = IDDQ + IADD = fCK× CPD× VDDQ, solving for CPD = (IDDQ + IADD)/(fCK × VDDQ) where fCK is the input frequency, VDDQ is the
power supply, and CPD is the power dissipation capacitance.
TIMING REQUIREMENTS
over recommended operating free-air temperature range
MAX
UNIT
fCK
Clock frequency (operating) (1) (2)
PARAMETER
AVDD, VDD = 1.8 V ±0.1 V
125
410
MHz
fCK
Clock frequency (application) (1) (3)
AVDD, VDD = 1.8 V ±0.1 V
160
410
MHz
tDC
Duty cycle, input clock
AVDD, VDD = 1.8 V ±0.1 V
40%
60%
tL
Stabilization time (4)
AVDD, VDD = 1.8 V ±0.1 V
(1)
(2)
(3)
(4)
6
TEST CONDITIONS
MIN
TYP
6
µs
The PLL must be able to handle spread spectrum induced skew.
Operating clock frequency indicates a range over which the PLL must be able to lock, but in which it is not required to meet the other
timing parameters (used for low speed system debug).
Application clock frequency indicates a range over which the PLL must meet all timing parameters.
Stabilization time is the time required for the integrated PLL circuit to obtain phase lock of its feedback signal to its reference signal,
within the value specified by the static phase offset t(φ), after power up. During normal operation, the stabilization time is also the time
required for the integrated PLL circuit to obtain phase lock of its feedback signal to its reference signal when CK and CK go to a logic
low state, enter the power-down mode, and later return to active operation. CK and CK may be left floating after they have been driven
low for one complete clock cycle.
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SWITCHING CHARACTERISTICS
over recommended operating free-air temperature range (unless otherwise noted) (1)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ten
Enable time, OE to any Y/Y
See Figure 12
8
ns
tdis
Disable time, OE to any Y/Y
See Figure 12
8
ns
Cycle-to-cycle period jitter (2)
160 MHz to 410 MHz, See Figure 5
Static phase offset time (3)
tjit(cc+)
tjit(cc-)
t(φ)
t(φ)dyn
Dynamic phase offset
tsk(o)
Output clock skew (4)
tjit(per)
time, (4)
Period jitter (5) (2)
tjit(hper) Half-period jitter (5) (2)
Σt(su)
Σt(h)
|tjit(per)| + |t(φ)dyn| + tsk(o) (6)
|t(φ)dyn| + + tsk(o)
(6)
Input clock skew rate
Output clock slew
VOX
40
0
–40
SeeFigure 4
–50
50
ps
See Figure 11
–20
20
ps
35
ps
See Figure 7
160 MHz to 270 MHz, See Figure 8
–30
30
271 MHz to 410 MHz, See Figure 8
–20
20
160 MHz to 270 MHz, See Figure 9
–75
75
271 MHz to 410 MHz, See Figure 9
–50
50
271 MHz to 410 MHz
271 MHz to 410 MHz
Slew rate, OE
SR
0
rate (7) (8)
Output differential-pair cross voltage (9)
See Figure 3 and Figure 8
0.5
See Figure 3 and Figure 8
1
2.5
1.5
2.5
See Figure 3 and Figure 8
See Figure 2
SSC modulation frequency
SSC clock input frequency deviation
PLL loop bandwidth
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
ps
ps
80
ps
60
ps
4
V/ns
3
(VDDQ/2) – 0.1
(VDDQ/2) + 0.1
30
33
0%
–0.5%
2
ps
V
kHz
MHz
There are two different terminations that are used with the following tests. The load/board in Figure 2 is used to measure the input and
output differential-pair cross voltage only. The load/board in Figure 3 is used to measure all other tests. For consistency, equal length
cables must be used.
This parameter is assured by design and characterization.
Phase static offset time does not include jitter.
For full frequency range of 160MHz to 410MHz.
Period jitter, half-period jitter specifications are separate specifications that must be met independently of each other.
In the frequency range of 271 MHz to 410 MHz, the minimum and maximum values of tjit(per) and t(φ)dyn and the maximum value for tsk(o)
must not exceed the corresponding minimum and maximum values of the 160 MHz to 270 MHz range. In addition, the sum of the
specified values for |tjit(per)|, |t(φ)dyn|, and tsk(o) must meet the requirements for the Σt(su) and the sum of the specified values for |t(φ)dyn|
and tsk(o) must meet the requirements for the Σt(h).
The output slew rate is determined from the IBIS model into the load shown in Figure 4.
To eliminate the impact of input slew rates on static phase offset, the input skew rates of reference clock input CK and CK and feedback
clock inputs FBIN and FBIN are recommended to be nearly equal. The 2.5-V/ns skew rates are shown as a recommended target.
Compliance with these typical values is not mandatory if it can adequately shown that alternative characteristics meet the requirements
of the registered DDR2 DIMM application.
Output differential-pair cross voltage specified at the DRAM clock input or the test load.
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Figure 2. Output Load Test Circuit 1 (Using High-Impedance Probe)
Figure 3. Output Load Test Circuit 2 (Using SMA Coaxial Cable)
Figure 4. IBIS Model Output Load
8
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tc(n)
tc(n+1)
tc(n)
tc(n+1)
Figure 5. Cycle-To-Cycle Period Jitter
t( )n
t( )n
t( )n
Figure 6. Static Phase Offset
Figure 7. Output Skew
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(n)
(n)
Figure 8. Period Jitter
(half period)n
(half period)n
(half period)n
Figure 9. Half-Period Jitter
Figure 10. Input and Output Slew Rates
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t(
t(
t(
)
t(
)dyn
)dyn
t(
)
)dyn
t(
)dyn
Figure 11. Dynamic Phase Offset
Figure 12. Time Delay Between OE and Clock Output (Y, Y)
A.
Place the 2200-pF capacitor close to the PLL.
B.
Use a wide trace for the PLL analog power and ground. Connect PLL and capacitors to AGND trace and connect
trace to one GND via (farthest from the PLL).
C.
Recommended bead: Fair-Rite PN 2506036017Y0 or equilvalent (0.8Ω dc maximum, 600Ω at 100 MHz).
Figure 13. Recommended AVDD Filtering
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PACKAGE OPTION ADDENDUM
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12-Sep-2006
PACKAGING INFORMATION
Orderable Device
Status (1)
CDCU2A877ZQLR
ACTIVE
BGA MI
CROSTA
R JUNI
OR
ZQL
52
1000 Green (RoHS &
no Sb/Br)
SNAGCU
Level-2-260C-1 YEAR
CDCU2A877ZQLT
ACTIVE
BGA MI
CROSTA
R JUNI
OR
ZQL
52
250
SNAGCU
Level-2-260C-1 YEAR
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
Green (RoHS &
no Sb/Br)
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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