DATASHEET
FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER
Description
The ICS341 is a low cost, single-output, field programmable
clock synthesizer. The ICS341 can generate an output
frequency from 250 kHz to 200 MHz and may employ
Spread Spectrum techniques to reduce system
electro-magnetic interference (EMI).
Using IDT’s VersaClock
™
software to configure the PLL and
output, the ICS341 contains a One-Time Programmable
(OTP) ROM to allow field programmability. Programming
features include 4 selectable configuration registers.
The device employs Phase-Locked Loop (PLL) techniques
to run 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 ICS341 is also available in factory programmed custom
versions for high-volume applications.
ICS341
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
•
Four 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 two output clocks, use the ICS342. 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
S1:0
Crystal or
clock input
X1/ICLK
2
OTP ROM
with PLL
Divider
Values
PLL Clock Synthesis,
Spred Spectrum and
Control Circuitry
CLK
Crystal
Oscillator
X2
External capacitors are
required with a crystal input.
GND
PDTS (output and PLL)
IDT™ / ICS™
FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER 1
ICS341
REV K 092109
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
