DATASHEET
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER ICS280
Description
Features
The ICS280 field programmable spread spectrum 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, crystal oscillators and stand alone spread
spectrum devices 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
• Configurable Spread Spectrum Modulation
• Input crystal frequency of 5 to 27 MHz
• Input clock frequency of 3 to 166 MHz
• Up to four reference outputs
TM
Using IDT’s VersaClock software to configure PLLs and
outputs, the ICS280 contains a One-Time Programmable
(OTP) ROM for field programmability. Programming
features include input/output frequencies, spread spectrum
amount and eight selectable configuration registers.
• Operating voltages of 3.3 V
• Controllable output drive levels
• Advanced, low-power CMOS process
• Available in RoHS compliant packaging
NOTE: EOL for non-green parts to occur on 5/13/10
per PDN U-09-01
Using Phase-Locked Loop (PLL) techniques, the device
runs from a standard fundamental mode, inexpensive
crystal, or clock. It can replace multiple crystals and
oscillators, saving board space and cost.
The ICS280 is also available in factory programmed custom
versions for high-volume applications.
Block Diagram
3
VDD
PLL1 with
Spread
Spectrum
3
S2:S0
OTP
ROM
CLK1
CLK2
CLK3
CLK4
with PLL
Values
Divide
Logic
and
Output
Enable
Control
PLL2
PLL3
Crystal or
Clock Input
X1/ICLK
X2
Crystal
Oscillator
3
GND
External capacitors
are required with a crystal input.
PDTS
IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 1
ICS280
REV E 083109
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
