DATASHEET
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER
Description
The ICS276 field programmable VCXO clock synthesizer
generates up to three 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 ICS276 contains a One-Time Programmable
(OTP) ROM for field programmability. Programming
features include VCXO and eight selectable configuration
registers.
Each of the outputs are powered by a single VDDO voltage.
VDDO may vary from 1.8 V to VDD.
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 ICS276 is also available in factory programmed custom
versions for high-volume applications.
ICS276
Features
•
•
•
•
•
•
•
•
•
•
•
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 three reference outputs
Operating voltages of 3.3 V
VDDO output control from 1.8 V to 3.3 V
Controllable output drive levels
Advanced, low-power CMOS process
Available in Pb (lead) free packaging
NOTE: EOL for non-green parts to occur on
5/13/10 per PDN U-09-01
Block Diagram
VDD
3
VDDO
S2:S0
3
OTP
ROM
with
PLL
Values
PLL1
CLK1
PLL2
Divide
Logic
and
Output
Enable
Control
CLK2
VIN
PLL3
X1
Crystal
X2
External capacitors
are required.
Voltage
Controlled
Crystal
Oscillator
GND
2
CLK3
PDTS
IDT™ / ICS™
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER 1
ICS276
REV D 081809
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
