DATASHEET
FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER
ICS342
Description
Features
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).
• 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
• Two ROM locations for frequency and spread selection
• Spread spectrum capability for lower system EMI
•Center or Down Spread up to 4% total
TM
Using IDT’s VersaClock 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.
•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.
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.
Block Diagram
VDD
OTP ROM
with PLL
Divider
SEL
CLK1
Values
PLL Clock Synthesis,
Spred Spectrum and
Control Circuitry
Crystal or
clock input
X1/ICLK
Crystal
Oscillator
CLK2
X2
External capacitors are
required with a crystal input.
GND
PDTS (both outputs and PLL)
IDT® / ICS™ FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER 1
ICS342
REV N 090613
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
