DATASHEET
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER
Description
The ICS275 field programmable VCXO clock synthesizer
generates up to four high-quality, high-frequency clock
outputs including multiple reference clocks from a
low-frequency crystal input. It is designed to replace
crystals and crystal oscillators in most electronic systems.
Using IDT’s VersaClock
TM
software to configure PLLs and
outputs, the ICS275 contains a One-Time Programmable
(OTP) ROM for field programmability. Programming
features include VCXO, eight selectable configuration
registers and up to two sets of two low-skew outputs.
Using Phase-Locked Loop (PLL) techniques, the device
runs from a standard fundamental mode, inexpensive
crystal, or clock. It can replace VCXOs, multiple crystals
and oscillators, saving board space and cost.
The ICS275 is also available in factory programmed custom
versions for high-volume applications.
ICS275
Features
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Packaged as 16-pin TSSOP
Eight addressable registers
Replaces multiple crystals and oscillators
Output frequencies up to 200 MHz at 3.3 V
Input crystal frequency of 5 to 27 MHz
Up to four reference outputs
Up to two sets of two low-skew outputs
Operating voltages of 3.3 V
Controllable output drive levels
Advanced, low-power CMOS process
Available in RoHS compliant packaging
NOTE: EOL for non-green parts to occur on
5/13/10 per PDN U-09-01
Block Diagram
VDD
3
S2:S0
3
OTP
ROM
with
PLL
Values
PLL1
CLK1
Divide
Logic
and
Output
Enable
Control
PLL2
CLK2
VIN
PLL3
X1
Crystal
X2
External capacitors
are required.
Voltage
Controlled
Crystal
Oscillator
GND
2
CLK3
CLK4
PDTS
IDT™ / ICS™
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER 1
ICS275
REV E 081809
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
