DATASHEET
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER
ICS276
Description
Features
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.
• Packaged as 16-pin TSSOP – Pb-free, RoHS compliant
• 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
TM
Using IDT’s VersaClock 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.
• Advanced, low-power CMOS process
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.
Block Diagram
3
VDDO
VDD
3
OTP
PLL1
S2:S0
ROM
with
CLK1
CLK2
CLK3
PLL
Values
Divide
Logic
and
Output
Enable
Control
PLL2
PLL3
VIN
X1
X2
Voltage
Controlled
Crystal
Crystal
Oscillator
GND
2
External capacitors
are required.
PDTS
IDT™ / ICS™ TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER 1
ICS276
REV E 051310
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
