ICS557-03 Datasheet, PDF (1/9 Pages) Integrated Circuit Systems – PCI-EXPRESS CLOCK SOURCE

ICS557-03
PCI-EXPRESS CLOCK SOURCE
Description
The ICS557-03 is a spread spectrum clock generator
supporting PCI-Express and Ethernet requirements.
The device is used for PC or embedded systems to
substantially reduce electromagnetic interference
(EMI). The device provides two differential (HCSL)
spread spectrum outputs. This device is pin configured
to select spread and clock selection. Using ICS’
patented Phase-Locked Loop (PLL) techniques, the
device takes a 25 MHz crystal input and produces two
pairs of differential outputs (HCSL) at 25 MHz, 100
MHz, 125 MHz and 200 MHz clock frequencies. It also
provides spread selection of ±0.25%, -0.5%, -0.75%,
and no spread.
Features
• Packaged in 16-pin TSSOP
• Available in Pb (lead) free package
• Supports LVDS Output Levels
• Operating voltage of 3.3 V
• Input frequency of 25 MHz
• Outputs (HCSL, 0.7 V Current mode differential pair)
• Jitter 100 ps (peak-to-peak)
• Spread of ±0.25%, -0.5%, -0.75%, and no spread.
• Industrial and commercial temperature ranges
Block Diagram
VDD
2
SS1:SS0
2
S1:S0
2
Control
Logic
Phase Lock Loop
X1/ICLK
25 MHz
crystal or clock _X2
Clock
Buffer/
Crystal
Oscillator
Optional tuning crystal
capacitors
2
GND
OE
CLK0
CLK0
CLK1
CLK1
Rr(IREF)
MDS 557-03 E
1
Revision 061005
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel [phone] ● www.icst.com