Field Programmable SS VersaClock Synthesizer
ICS251
DATASHEET
Description
Features
The ICS251 is a low cost, single-output, field programmable
clock synthesizer. The ICS251 can generate an output
frequency from 314 kHz to 200 MHz and may employ Spread
Spectrum techniques to reduce system electro-magnetic
interference (EMI).
• 8-pin SOIC package
• Four addressable registers
• Input crystal frequency of 5 to 27 MHz
• Clock input frequency of 3 to 150 MHz
• Output clock frequencies up to 200 MHz
• Configurable Spread Spectrum Modulation
• Operating voltage of 3.3 V
™
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.
• Replaces multiple crystals and oscillators
• Controllable output drive levels
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.
• Advanced, low-power CMOS process
• Available in RoHS compliant packaging
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.
Block Diagram
VDD
OTP ROM
2
with PLL
S1:0
Divider
Values
PLL Clock Synthesis,
Spread Spectrum and
Control Circuitry
CLK
Crystal or
clock input
X1/ICLK
Crystal
Oscillator
X2
GND
External capacitors are
required with a crystal input.
PDTS (output and PLL)
ICS251 REVISION E 05/19/14
1
©2014 Integrated Device Technology, Inc.
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
