ICS650-40A Datasheet, PDF (1/6 Pages) Integrated Circuit Systems – ETHERNET SWITCH CLOCK SOURCE

ICS650-40A
ETHERNET SWITCH CLOCK SOURCE
Description
The ICS650-40A is a clock chip designed for use as a
core clock in Ethernet Switch applications. Using ICS’
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
VDD
2
VDDOA VDDOB
S1:S0
2
Control
Logic
Phase Lock Loop
X1/ICLK
25 MHz
crystal or clock _X2
Clock
Buffer/
Crystal
Oscillator
Optional tuning crystal
4
capacitors
OE
GND
CLKB
CLKA
CLKA
MDS 650-40A B
1
121004
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel [phone] ● www.icst.com