DATASHEET
FIELD PROGRAMMABLE TRIPLE OUTPUT SS VERSACLOCK SYNTHESIZER
ICS343
Description
Features
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
• 8-pin SOIC package (Pb-free)
• 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
electro-magnetic interference (EMI).
Using IDT’s VersaClock™ software to configure the PLL
and output, the ICS343 contains a One-Time
•Selectable 32 kHz or 120 kHz modulation
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.
• 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.
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.
Block Diagram
VDD
OTP ROM
with PLL
Divider
CLK1
Values
PLL Clock Synthesis,
Spred Spectrum and
Control Circuitry
Crystal or
clock input
CLK2
CLK3
X1/ICLK
Crystal
Oscillator
X2
GND
External capacitors are
PDTS (both outputs and PLL)
required with a crystal input.
IDT®/ ICS™ FIELD PROGRAMMABLE TRIPLE OUTPUT SS VERSACLOCK SYNTHESIZER 1
ICS343
REV M 090613
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
