CSPU877BVG8 IDT, CSPU877BVG8 Datasheet

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CSPU877BVG8

Manufacturer Part Number
CSPU877BVG8
Description
Clock Drivers & Distribution 1.8V PLL Differ 1
Manufacturer
IDT
Datasheet

Specifications of CSPU877BVG8

Rohs
yes
Part # Aliases
IDTCSPU877BVG8
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FEATURES:
• 1 to 10 differential clock distribution
• Optimized for clock distribution in DDR2 (Double Data Rate)
• Operating frequency: 125MHz to 340MHz
• Very low skew: ≤ ≤ ≤ ≤ ≤ 40ps
• Very low jitter: ≤ ≤ ≤ ≤ ≤ 40ps
• 1.8V AV
• CMOS control signal input
• Test mode enables buffers while disabling PLL
• Low current power-down mode
• Tolerant of Spread Spectrum input clock
• Available in 52-Ball VFBGA and 40-pin VFQFPN packages
NOTE:
The Logic Detect (LD) powers down the device when a logic LOW is applied to both CLK and CLK.
COMMERCIAL TEMPERATURE RANGE
APPLICATIONS:
• Meets or exceeds JEDEC standard 82-8 for registered DDR2
• Along with SSTU32864/A, DDR2 register, provides complete
FUNCTIONAL BLOCK DIAGRAM
IDTCSPU877
1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER
c
SDRAM applications
clock driver
solution for DDR2 DIMMs
2006 Integrated Device Technology, Inc.
DD
and 1.8V V
DDQ
10KΩ - 100KΩ
FBIN
FBIN
CLK
CLK
OS
OE
1.8V PHASE LOCKED LOOP
DIFFERENTIAL 1:10 SDRAM
CLOCK DRIVER
AV
DD
POWER
LOGIC
DOWN
MODE
TEST
PLL
AND
1
LD
DESCRIPTION:
to distribute one differential clock input pair(CLK, CLK ) to 10 differential
output pairs (Y
(FBOUT, FBOUT). External feedback pins (FBIN, FBIN) for synchronization
of the outputs to the input reference is provided. OE, OS, and A
power-down and test mode logic. When A
off and bypassed for test mode purposes. When the differential clock inputs
(CLK, CLK) are both at logic low, this device will enter a low power-down mode.
In this mode, the receivers are disabled, the PLL is turned off, and the output
clock drivers are disabled, resulting in a current consumption device of less than
500μA.
for very low phase error, skew, and jitter, while maintaining frequency and duty
cycle over the operating voltage and temperature range. The CSPU877,
designed for use in both module assemblies and system motherboard based
solutions, provides an optimum high-performance clock source.
+70°C). See Ordering Information for details.
The CSPU877 is a PLL based clock driver that acts as a zero delay buffer
The CSPU877 requires no external components and has been optimised
The CSPU877 is available in Commercial Temperature Range (0°C to
LD, OS, or OE
LD or OE
PLL BYPASS
[0:9]
, Y
[0:9]
) and one differential pair of feedback clock output
COMMERCIAL TEMPERATURE RANGE
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
FBOUT
FBOUT
VDD
is grounded, the PLL is turned
OCTOBER 2006
IDTCSPU877
VDD
DSC-5962/38
control the

Related parts for CSPU877BVG8

CSPU877BVG8 Summary of contents

Page 1

... FUNCTIONAL BLOCK DIAGRAM 10KΩ - 100KΩ NOTE: The Logic Detect (LD) powers down the device when a logic LOW is applied to both CLK and CLK. The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE c 2006 Integrated Device Technology, Inc. ...

Page 2

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER PIN CONFIGURATION GND GND GND GND BALL VFBGA PACKAGE LAYOUT Y Y FBIN FBIN FBOUT GND OS DDQ DDQ DDQ ...

Page 3

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER PIN CONFIGURATION 1 V DDQ CLK CLK 5 GND V 6 DDQ AGND DDQ 10 GND VFQFPN TOP VIEW RECOMMENDED OPERATING CONDITIONS Symbol DD (1) AV Supply Voltage V I/O Supply Voltage DDQ T Operating Free-Air Temperature A NOTE: 1 ...

Page 4

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER PIN DESCRIPTION (VFBGA) Pin Name AGND AV DD CLK, CLK FBIN, FBIN FBOUT, FBOUT GND B2 - B5, C2, C5, H2, H5 D4, E2, E5, F2 DDQ A3, A4, B1, B6, C1, C6, K1, K2, K5, K6 [0:9] Y A1, A2, A5, A6, D1, D6, J1, J6, K3, K4 ...

Page 5

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER FUNCTION TABLE (1,2) INPUTS GND H X GND H X GND L H GND L L 1.8V (nom 1.8V (nom 1.8V (nom 1.8V (nom 1.8V (nom NOTES HIGH Voltage Level L = LOW Voltage Level X = Don't Care 2. L(z) means the outputs are disabled to a LOW state, meeting the I 3 ...

Page 6

... Modulation Frequency SSC Clock Input Frequency Deviation f PLL Loop Bandwidth 3dB NOTES: 1. There are two different terminations that are used with the above AC tests. The output load shown in figure 1 is used to measure the input and output differential pair cross-voltage only. The output load shown in figure 2 is used to measure all other tests, including input and output slew rates. For consistency, use 50Ω equal length cables with SMA connectors on the test board ...

Page 7

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER TEST CIRCUIT AND SWITCHING WAVEFORMS V DDQ CSPU877 GND V /2 DDQ Z = 60Ω 2.97" 60Ω 2.97" CSPU877 V /2 DDQ Z = 60Ω 2.97" GND R = 120Ω 60Ω 2.97" GND Figure 1: Output Load Test Circuit 10Ω ...

Page 8

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER TEST CIRCUIT AND SWITCHING WAVEFORMS Yx, FBOUT Yx, FBOUT CLK CLK FBIN FBIN Yx Yx Yx, FBOUT Yx, FBOUT t t cycle n cycle n jit(cc) cycle n cycle n+1 Cycle-to-Cycle jitter t t (Ø) (Ø)n ∑ (Ø)n (Ø Static Phase Offset ...

Page 9

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER TEST CIRCUIT AND SWITCHING WAVEFORMS Yx, FBOUT Yx, FBOUT Yx, FBOUT Yx, FBOUT NOTE Average input frequency measured at CLK / CLK Yx, FBOUT Yx, FBOUT Yx, FBOUT Yx, FBOUT NOTE Average input frequency measured at CLK / CLK t cycle jit(per) = cycle Period jitter ...

Page 10

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER TEST CIRCUIT AND SWITCHING WAVEFORMS OE Y Time Delay Between Output Enable (OE) and Clock Output (Y, Y) CLK CLK FBIN FBIN SSC OFF SSC ON t (Ø)DYN 50% V DDQ t EN 50% V DDQ 50 (Ø) t (Ø)DYN ...

Page 11

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER TEST CIRCUIT AND SWITCHING WAVEFORMS 80% Clock Inputs and Outputs SLR(I/O) BEAD VIA 1Ω 0603 CARD V DDQ 4.7uF 1206 GND VIA CARD NOTES: Place all decoupling capacitors as close to the CSPU877 pins as possible. Use wide traces for A and AGND ...

Page 12

... IDTCSPU877 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER APPLICATION INFORMATION CLK R = 120Ω CLK FBIN R = 120Ω 10pF FBIN Feedback path CLK R = 120Ω CLK C = 10pF R = 120Ω Feedback path ~2.5" CSPU877 Z = 60Ω 60Ω 8 more Clock Structure 1 ~2.5" CSPU877 Z = 60Ω ...

Page 13

... Very Fine Pitch Ball Grid Array BVG Very Fine Pitch Ball Grid Array. Green NL Thermally Enhanced Plastic Very Fine Pitch Quad Flat Pack No Lead Package 1.8V PLL Differential 1:10 SDRAM Clock Driver 877 for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com 13 COMMERCIAL TEMPERATURE RANGE for Tech Support: logichelp@idt.com ...

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