ICS9FG107 Datasheet, PDF (1/18 Pages) Integrated Circuit Systems – Programmable FTG for Differential CPU, PCI Express & SATA Clocks

DATASHEET
Programmable FTG for Differential P4^TM CPU, PCI-Express & SATA
Clocks
ICS9FG107
Description
ICS9FG107 is a Frequency Timing Generator that provides 7
differential output pairs that are compliant to the Intel CK409/CK410
specification. It 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.
ICS9FG107 also provides a copy of the reference clock and 333
MHz PCI output clocks. Frequency selection can be accomplished
via strap pins or SMBus control.
Features/Benefits
• Generates common CPU/PCI Express frequencies from
14.318 MHz or 25 MHz
• Crystal or reference input
• 7 - 0.7V current-mode differential output pairs
• 3 - 33MHz PCI outputs
• 1 - REFOUT
• 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.
Key Specifications
• Output cycle-to-cycle jitter for DIF outputs < 50 ps (<85ps
@ 266 MHz)
• Output to output skew for DIF outputs < 85 ps
• +/-300 ppm frequency accuracy on output clocks
• 48-pin SSOP/TSSOP package
• Available in RoHS compliant packaging
Funtional Block Diagram
XIN/CLKIN
X2
REFOUT
SCLK
SDATA
DIF_STOP#
SEL14M_25M#
SPREAD
DWNSPRD#
OE (6:0)
FS (2:0)
Control
Logic
Programmable
Spread
PLL1
Programmable
Frequency
Dividers
PCICLK (1:0)
PCICLK_F
DIF (6:0)
DIF# (6:0)
I REF
IDT^TM/ICS^TM Programmable FTG for Differential P4^TM CPU, PCI-Express & SATA Clocks
1
ICS9FG107 REV F 08/21/07