
DATASHEET
ETHERNET SWITCH CLOCK SOURCE
ICS650-40A
IDT / ICS ETHERNET SWITCH CLOCK SOURCE
1
ICS650-40A
REV E 051310
Description
The ICS650-40A is a clock chip designed for use as a core
clock in Ethernet Switch applications. Using IDT’s patented
Phase-Locked Loop (PLL) techniques, the device takes a
25 MHz crystal input and produces various output clock
frequencies as listed in Output Select Table.
Features
Packaged in 16-pin TSSOP
Operating voltage of 3.3 V
Low power consumption
Input frequency of 25 MHz
Low long-term jitter
Separate supply voltage for clock outputs (2.5 / 3.3 V
clock outputs)
OE control capability
Block Diagram
Phase Lock Loop
Clock
Buffer/
Crystal
Oscillator
VDD
GND
2
4
X1/ICLK
X2
25 MHz
crystal or clock
Control
Logic
OE
S1:S0
CLKA
2
CLKA
Optional tuning crystal
capacitors
VDDOB
VDDOA
CLKB