ICS9FG108 Datasheet, PDF (1/19 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4 CPU, PCI-Express & SATA Clocks

Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
DATASHEET
ICS9FG108
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 50
ps and output-to-output skew of less than 65 ps. ICS9FG108 also
provides a copy of the reference clock. Frequency selection can be
accomplished via strap pins or SMBus control.
Key Specifications
• Output cycle-to-cycle jitter < 50 ps
• Output to output skew < 65 ps
• +/-300 ppm frequency accuracy on output clocks
• +/-150 ppm frequency accuracy @100 MHz outputs
• 48-pin SSOP/TSSOP package
• Available in RoHS compliant packaging
Features/Benefits
• Generates common frequencies from 14.318 MHz or
25 MHz
• Crystal or reference input
• 8 - 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.
• Programmable OE Polarity
• M/N Programming
Funtional Block Diagram
XIN/CLKIN
X2
OE(7:0)
OSC
PROGRAMMABLE
SPREAD PLL
STOP
8
LOGIC
R EFOU T
DIF(7:0)
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
ICS9FG108 REV G 04/06/07