ICS557-03 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – PCI-EXPRESS CLOCK SOURCE

PCI-EXPRESS CLOCK SOURCE
DATASHEET
ICS557-03
Description
The ICS557-03 is a spread spectrum clock generator that
supports 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.
The spread type and amount are configured via select pin.
Using IDT’s patented Phase-Locked Loop (PLL)
techniques, the device takes a 25 MHz crystal input and
produces two pairs of differential outputs at 25 MHz, 100
MHz, 125 MHz or 200 MHz clock frequencies for HCSL,
and 25 MHz or 100 MHz for LVDS.
Features
• Packaged in 16-pin TSSOP
• Available in RoHS 5 (green) or RoHS 6 (green and lead
free) compliant packaging
• Supports HCSL or LVDS output levels
• Operating voltage of 3.3 V
• Input frequency of 25 MHz
• Jitter 80 ps (peak-to-peak)
• Spread Spectrum capability
• 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)
IDT™ / ICS™ PCI-EXPRESS CLOCK SOURCE
1
ICS557-03 REV K 102907