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.
NOTE: EOL for non-green parts to occur on
5/13/10 per PDN U-09-01
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 E 081809
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
