557G-03LF Datasheet, PDF (1/11 Pages) Integrated Device Technology – 2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE

2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE
DATASHEET
ICS557-03
Description
The ICS557-03 is a spread spectrum clock generator that
supports PCI-Express Gen 1 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
• 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 60 ps (cycle-to-cycle)
• Spread Spectrum capability
• Industrial and commercial temperature ranges
• For PCIe Gen2 applications, see the 5V41065
• For PCIe Gen3 applications, see the 5V41235
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® 2 OUTPUT PCI-EXPRESS GEN1 CLOCK SOURCE
1
ICS557-03 REV U 112111