ICS544-01
MDS 544M-01 A 1 Revision 041505
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
Clock Divider
PRELIMINARY INFORMATION
Description
The ICS544-01 is crystal oscillator module IC with
divide by 512 frequency output. It employs a 16.777216
MHz fundamental frequency crystal source oscillator to
generate 32.768 kHz output crystal oscillator output. In
addition a divide by 256, 64 and 32 options also
provided through select pins. The chip has an OE pin
that tri-states the output and stops the oscillator
circuits.
The ICS544-01 is a member of ICS’ ClockBlocks
TM

family of clock building blocks. See the ICS541 and
ICS542 for other clock dividers, and the ICS501, 502,
511, 512, and 525 for clock multipliers.
Features
• Packaged in 8-pin SOIC or die
• Available in Pb-free package
• ICS’ lowest cost clock divider
• Easy to use with other generators and buffers
• Input clock frequency up to 156 MHz
• Output clock duty cycle of 45/55
• Output Enable
• Advanced, low-power CMOS process
• Operating voltage of 2.25 V to 3.6 V
• Does not degrade phase noise - no PLL
• Available in industrial temperature range
Block Diagram
Divider and
Selection
Circuitry
/32, /64
/256, /512,
CLK1
OEGND
VDD
X1/ICLK
X2
16.777216
MHz clock
or crystal
input
Optional tuning
capacitors
S1, S0 (1:0)