ICS331-26
Single Output Clock Synthesizer
Description
Features
The ICS331-26 is a low cost frequency generator that
is factory programmable. Using analog/digital
Phase-Locked-Loop (PLL) techniques, the device
accepts a 24 MHz clock input to produce selectable
output clocks of 48 MHz and 72 MHz.
• 8-pin SOIC package – Pb-free, RoHS compliant
• Input clock frequency of 24 MHz
• Selectable output clocks of 48 MHz or 72 MHz
• Spread spectrum
• Duty cycle of 45/55
• Operating voltage of 3.3 V
The device also has a power down feature that
tri-states the clock outputs and turns off the PLLs when
the PDTS pin is taken low.
• Advanced, low power CMOS process
Block Diagram
VDD
OTP
ROM with
2
S1:0
PLL
Divider
Values
PLL Clock
Synthesis
and Control
Circuitry
CLK
24 MHz Crystal
or Clock
X1
Crystal
Oscillator
X2
GND
Optional crystal capacitors
PDTS (both outputs and PLL)
MDS 331-26 E
1
Revision 051310
Integrated Device Technology, Inc. ● www.idt.com
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
