ICS9FG104 Datasheet, PDF (1/17 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4TM CPU, PCI-Express & SATA Clocks

Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
DATASHEET
ICS9FG104
Description
Features/Benefits
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.
•
Key Specifications
•
Generates common frequencies from 14.318 MHz or
25 MHz
Crystal or reference input
4 - 0.7V current-mode differential output pairs
Supports Serial-ATA at 100 MHz
Two spread spectrum modes: 0 to -0.5 downspread
and +/-0.25% centerspread
Unused inputs may be disabled in either driven or Hi-Z
state for power management.
M/N Programming
• Output cycle-to-cycle jitter < 50 ps
• Output to output skew < 35 ps
• +/-300 ppm frequency accuracy on output clocks
• +/- 150 ppm frequency accuracy @ 100 MHz outputs
• 28-pin SSOP/TSSOP package
• Available in RoHS compliant packaging
Funtional 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
IDT^TM/ICS^TM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
1
ICS9FG104 REV K 04/12/07