DATASHEET
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER
ICS275
Description
Features
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.
• 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
TM
Using IDT’s VersaClock 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.
• Advanced, low-power CMOS process
• Available in RoHS compliant packaging
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.
Block Diagram
3
VDD
3
OTP
PLL1
PLL2
S2:S0
CLK1
CLK2
CLK3
CLK4
ROM
with
PLL
Divide
Logic
and
Output
Enable
Control
Values
VIN
PLL3
X1
X2
Voltage
Controlled
Crystal
Crystal
Oscillator
GND
2
External capacitors
are required.
PDTS
IDT™ / ICS™ TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK SYNTHESIZER 1
ICS275
REV D 102808
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
