PRELIMINARY INFORMATION
ICS280
Triple PLL Field Prog. Spread Spectrum Clock Synthesizer
Description
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.
Using ICS鈥?VersaClock
TM
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.
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.
Features
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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
Operating voltages of 3.3 V
Controllable output drive levels
Advanced, low-power CMOS process
Available in Pb (lead) free packaging
Block Diagram
VDD
PLL1 with
Spread
Spectrum
Divide
Logic
and
Output
Enable
Control
3
S2:S0
3
OTP
ROM
with PLL
Values
CLK1
PLL2
CLK2
Crystal or
Clock Input
X1/ICLK
Crystal
Oscillator
X2
External capacitors
are required with a crystal input.
CLK3
PLL3
CLK4
GND
3
PDTS
MDS 280 C
Integrated Circuit Systems, Inc.
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1
525 Race Street, San Jose, CA 95126
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Revision 062205
tel (408) 297-1201
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