ICS9FG104 Datasheet, PDF (3/15 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4TM CPU, PCI-Express & SATA Clocks

Integrated
Circuit
Systems, Inc.
ICS9FG104
General Description
The ICS9FG104 is a Frequency Timing Generator that provides 4 differential output pairs that are compliant to the Intel CK410
specification. It also provides support for PCI-Express and SATA. The part synthesizes several output frequencies from either
a 14.31818 Mhz crystal or a 25 MHz crystal. The device can also be driven by a reference input clock instead of a crystal. It
provides outputs with cycle-to-cycle jitter of less than 50 ps and output-to-output skew of less than 35 ps.
The ICS9FG104 also provides a copy of the reference clock. Frequency selection can be accomplished via strap pins or
SMBus control.
Block Diagram
XIN/CLKIN
X2
2
OSC
PROGRAMMABLE
SPREAD PLL
STOP
4
LOGIC
REFOUT
DIF(3:0)
SPREAD
SEL14M_25M#
DIF_STOP#
FS(2:0)
SDATA
SCLK
CONTROL
LOGIC
IREF
Power Groups
Pin Number
VDD
GND
3
4
9,21
10,20
28
27
Description
REFOUT, Digital Inputs
DIF Outputs
IREF, Analog VDD, GND for PLL Core
0839D—06/02/05
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