Field Programmable SS VersaClock®
Synthesizer
ICS251
DATASHEET
Description
The ICS251 is a low cost, single-output, field programmable
clock synthesizer. The ICS251 can generate an output
frequency from 314kHz to 200MHz 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 ICS251 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 ICS251 is also available in factory programmed custom
versions for high-volume applications.
Features
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8-pin SOIC package
Four addressable registers
Input crystal frequency of 5 to 27MHz
Clock input frequency of 3 to 150MHz
Output clock frequencies up to 200MHz
Configurable spread spectrum modulation
Operating voltage of 3.3V
Replaces multiple crystals and oscillators
Controllable output drive levels
Advanced, low-power CMOS process
RoHS compliant packaging
Block Diagram
VDD
S1:0
2
OTP ROM
with PLL
Divider
Values
Crystal or
clock input
X1/ICLK
Crystal
Oscillator
X2
External capacitors are
required with a crystal input.
PLL Clock Synthesis,
Spread Spectrum and
Control Circuitry
CLK
GND
PDTS (output and PLL)
ICS251 OCTOBER 10, 2017
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©2017 Integrated Device Technology, Inc.
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
