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9SQL4958 Datasheet, PDF (1/20 Pages) Integrated Device Technology – 8-output CK420BQ Derivative | |||
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8-output CK420BQ Derivative
9SQL4958
Description
The 9SQL4958 is a member of IDT's 'Lite' family of server
clocks. It generates 8 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
9SQL4958 supports PCIe Common Clock (CC) and
Independent Reference Clock (IR) architectures.
Recommended Application
PCIe Gen1, Gen2, Gen3, Gen4 Server Clock
Output Features
⢠8 -100MHz Low-power HCSL (LP-HCSL) CPU/SRC pairs
⢠Integrated terminations for 85⦠Zo
⢠1 - 3.3V LVCMOS REF output w/Wake-On-LAN (WOL)
support
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
Block Diagram
vOE(7:0)#
8
XIN/CLKIN_25
X2
vSADR
vSS_EN_tri
^CKPWRGD_PD#
SDATA_3.3
SCLK_3.3
Control
Logic
DATASHEET
Features/Benefits
⢠Direct connection to 85ï transmission lines; saves 32
resistors and 55mm2 compared to standard HCSL
⢠132mW typ. power consumption; eases thermal concerns
@ 1/10 the power of CK420BQ
⢠Contains default configuration; SMBus interface not
required for device operation
⢠OE# pins; support BLCK power management
⢠25MHz input frequency; standard crystal frequency
⢠25MHz REF output; eliminates XO from board
⢠Pin/SMBus selectable 0%, -0.25% or -0.5% spread on
BLCK outputs; minimize EMI and phase jitter for each
application
⢠BLCK outputs blocked until PLL is locked; clean system
start-up
⢠Two selectable SMBus addresses; multiple devices can
easily share an SMBus segment
⢠Space saving 48-pin 6x6mm VFQFPN; minimal board
space
SSC
Capable
PLL
REF
BCLK7
BCLK6
BCLK5
BCLK4
BCLK3
BCLK2
BCLK1
BCLK0
9SQL4958 OCTOBER 28, 2016
1
©2016 Integrated Device Technology, Inc.
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