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
• 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
• Available in Pb (lead) free packaging
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.
NOTE: EOL for non-green parts to occur on
5/13/10 per PDN U-09-01
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 D 081809
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
