DATASHEET
FIELD PROGRAMMABLE TRIPLE OUTPUT SS VERSACLOCK SYNTHESIZER
ICS343
Description
The ICS343 is a low cost, triple-output, field programmable
clock synthesizer. The ICS343 can generate three output
frequencies from 250 kHz to 200 MHz, using up to three
independently configurable PLLs. The outputs may employ
Spread Spectrum techniques to reduce system
electro-magnetic interference (EMI).
Using ICS’ VersaClock™ software to configure the PLL and
output, the ICS343 contains a One-Time Programmable
(OTP) ROM to allow field programmability. 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 ICS343 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
•
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, using advanced, low power
•
•
CMOS process
For one output clock, use the ICS341. For two output
clocks, see the ICS342. For more than three outputs, see
the ICS345 or ICS348.
Available in Pb (lead) free packaging
Block Diagram
VDD
OTP ROM
with PLL
Divider
Values
Crystal or
clock input
X1/ICLK
Crystal
Oscillator
X2
External capacitors are
required with a crystal input.
CLK1
PLL Clock Synthesis,
Spred Spectrum and
Control Circuitry
CLK2
CLK3
GND
PDTS (both outputs and PLL)
IDT™ / ICS™
FIELD PROGRAMMABLE TRIPLE OUTPUT SS VERSACLOCK SYNTHESIZER 1
ICS343
REV J 061206
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
