ICS9FG108 Datasheet, PDF (4/13 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4 CPU, PCI-Express & SATA Clocks

Integrated
Circuit
Systems, Inc.
ICS9FG108
Advance Information
General Description
ICS9FG108 is a Frequency Timing Generator that provides 8 differential output pairs that are compliant to the Intel CK410
specification. It also provides support for PCI-Express, next generation I/O, 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 85 ps and output-to-output skew of less than 85 ps.
ICS9FG108 also provides a copy of the reference clock. Frequency selection can be accomplished via strap pins or SMBus
control.
Block Diagram
XIN/CLKIN
X2
OE(7:0)
OSC
PROGRAMMABLE
SPREAD PLL
STOP
4
LOGIC
REFOUT
DIF(7:0)
SPREAD
SEL14M_25M#
DIF_STOP#
FS(2:0)
SDATA
SCLK
CONTROL
LOGIC
IREF
Power Groups
Pin Number
VDD
GND
3
4
10,14,19,31,36,40 15,35
N/A
47
48
47
Description
REFOUT, Digital Inputs, SMBus
DIF Outputs
IREF
Analog VDD & GND for PLL Core
0823—04/02/04
4