9SQL4952 Datasheet, PDF (1/20 Pages) Integrated Device Technology – 2-output CK420BQ Derivative

2-output CK420BQ Derivative
9SQL4952
Description
The 9SQL4952 is a member of IDT's 'Lite' family of server
clocks. It generates 2 100MHz outputs that exceed the
requirements of the CK420BQ CPU/SRC clocks. Each output
has its own OE# pin for clock management and supports 2
different spread spectrum levels in addition to spread off. It
also provides a copy of the 25MHz internal XO. The
9SQL4952 supports PCIe Common Clock (CC) and
Independent Reference Clock (IR) architectures.
Recommended Application
PCIe Gen1, Gen2, Gen3, Gen4 Server Clock
Output Features
• 2-100MHz push-pull Low-power (LP) HCSL BCLK pairs
• Integrated terminations for 85Ω Zout
• 1 - 3.3V 25MHz LVCMOS REF output
Key Specifications
• BCLK outputs:
• Cycle-to-cycle jitter <50ps
• Output-to-output skew <50ps
• PCIe Gen1, Gen2, Gen3, Gen4 CC compliant
• PCIe Gen2, Gen3 IR compliant
• QPI/UPI compliant
• SAS12G compliant (SSC off)
• 12k-20M phase jitter <2ps rms (SSC off)
• REF output:
• Phase jitter <200fs rms (SSC off)
• ±50ppm frequency accuracy on all clocks
DATASHEET
Features/Benefits
• Direct connection to 85 transmission lines; saves 8
resistors and 14mm² compared to standard HCSL
• 112mW typical power consumption; eases thermal
concerns @ 1/10 the power of CK420BQ
• Contains default configuration; SMBus interface not
required for device operation
• OE# pins; support BCLK power management
• 25MHz input frequency; standard crystal
• 25MHz REF output; eliminates XO from board
• Pin/SMBus selectable 0%, -0.25% or -0.5% spread on
BCLK outputs; minimize EMI and phase jitter for each
application
• BCLK outputs blocked until PLL is locked; clean system
start-up
• Two selectable SMBus addresses; multiple devices can
easily share an SMBus segment
• Space saving 24-pin 4x4mm VFQFPN; minimal board
space
Block Diagram
p
REF
vOE(1:0)#
2
XIN/CLKIN_25
X2
vSADR
vSS_EN_tri
^CKPWRGD_PD#
SDATA_3.3
SCLK_3.3
Control
Logic
SSC
Capable
PLL
BCLK1
BCLK0
9SQL4952 DECEMBER 12, 2016
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©2016 Integrated Device Technology, Inc.