DATASHEET
FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER
ICS342
Description
The ICS342 is a low cost, dual-output, field programmable
clock synthesizer. The ICS342 can generate two output
frequencies from 250 kHz to 200 MHz, using up to two
independently configurable PLLs. The outputs may employ
Spread Spectrum techniques to reduce system
electro-magnetic interference (EMI).
Using ICS’ VersaClock
TM
software to configure the PLL and
output, the ICS342 contains a One-Time Programmable
(OTP) ROM to allow field programmability. Programming
features include 2 selectable configuration registers. Using
Phase-Locked Loop (PLL) techniques, the device runs from
a standard fundamental mode, inexpensive crystal, or
clock. It can replace multiple crystals and oscillators, saving
board space and cost.
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.
The ICS342 is also available in factory programmed custom
versions for high-volume applications.
Features
•
8-pin SOIC package
•
Highly accurate frequency generation
•
M/N Multiplier PLL: M = 1...2048, N = 1...1024
•
Output clock frequencies up to 200 MHz
•
Two ROM locations for frequency and spread selection
•
Spread spectrum capability for lower system EMI
•
Center or Down Spread up to 4% total
•
Selectable 32 kHz or 120 kHz modulation
•
Input crystal frequency from 5 to 27 MHz
•
Input clock frequency from 2 to 50 MHz
•
Operating voltage of 3.3 V
•
Advanced, low power CMOS process
•
For one output clock, use the ICS341. For three output
•
clocks, see the ICS343. For more than three outputs, see
the ICS345 or ICS348.
Available in Pb (lead) free packaging
NOTE: EOL for non-green parts to occur on 5/13/10
per PDN U-09-01
Block Diagram
VDD
SEL
Crystal or
clock input
X1/ICLK
OTP ROM
with PLL
Divider
Values
CLK1
PLL Clock Synthesis,
Spred Spectrum and
Control Circuitry
Crystal
Oscillator
X2
External capacitors are
required with a crystal input.
CLK2
GND
PDTS (both outputs and PLL)
IDT™ / ICS™
FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER 1
ICS342
REV L 092109
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
