PRELIMINARY DATASHEET
TRIPLE PLL FIELD PROGRAMMABLE VCXO CLOCK
ICS270
Description
Features
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.
• 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
TM
Using IDT’s VersaClock 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.
• Controllable output drive levels
• Advanced, low-power CMOS process
• Available in Pb (lead) free 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 ICS270 is also available in factory programmed custom
versions for high-volume applications.
Block Diagram
3
VDD
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
3
OTP
PLL1
PLL2
S2:S0
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
1
ICS270
REV D 052008
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
