PRELIMINARY DATASHEET
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK
Description
The ICS270 field programmable VCXO clock synthesizer
generates up to eight 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 ICS270 contains a One-Time Programmable
(OTP) ROM for field programmability. Programming
features include VCXO, eight selectable configuration
registers and up to two sets of four low-skew outputs.
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 ICS270 is also available in factory programmed custom
versions for high-volume applications.
ICS270
Features
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Packaged as 20-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 eight reference outputs
Up to two sets of four low-skew outputs
Operating voltages of 3.3 V
Controllable output drive levels
Advanced, low-power CMOS process
Available in Pb (lead) free packaging
Block Diagram
VDD
3
S2:S0
3
OTP
ROM
with
PLL
Values
CLK1
PLL1
CLK2
Divide
Logic
and
Output
Enable
Control
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
PLL2
VIN
PLL3
X1
Crystal
X2
External capacitors
are required.
Voltage
Controlled
Crystal
Oscillator
GND
2
PDTS
IDT™ / ICS™
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK
1
ICS270
REV D 052008
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
