ICS557-01 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – PCI-EXPRESS CLOCK SOURCE

ICS557-01
PCI-EXPRESS CLOCK SOURCE
Description
The ICS557-01 is a clock chip designed for use in
PCI-Express Cards as a clock source. It provides a pair
of differential outputs at 100 MHz in a small 8-pin SOIC
package.
Using ICS’ patented Phase-Locked Loop (PLL)
techniques, the device takes a 25 MHz crystal input
and produces HCSL (Host Clock Signal Level)
differential outputs at 100 MHz clock frequency. LVDS
signal levels can also be supported via an alternative
termination scheme.
Block Diagram
Features
• Supports PCI-Express^TM HCSL Outputs
0.7 V current mode differential pair
• Supports LVDS Output Levels
• Packaged in 8-pin SOIC
• Available in Pb (lead) free package
• Operating voltage of 3.3 V
• Low power consumption
• Input frequency of 25 MHz
• Short term jitter 100 ps (peak-to-peak)
• Output Enable via pin selection
• Industrial temperature range available
VDD
X1
25 MHz
crystal /clock
X2
Clock
Buffer/
Crystal
Oscillator
Phase Lock
Loop
Crystal Tuning Capacitors
GND
OE
CLK
CLK
R_R(IREF)
MDS 557-01 F
1
Revision 011606
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