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ICS281 Datasheet(PDF) 1 Page - Integrated Circuit Systems

Part # ICS281
Description  Triple PLL Field Prog. Spread Spectrum Clock Synthesizer
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS281 Datasheet(HTML) 1 Page - Integrated Circuit Systems

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ICS281
MDS 281 C
1
Revision 062205
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com
Triple PLL Field Prog. Spread Spectrum Clock Synthesizer
PRELIMINARY INFORMATION
Description
The ICS281 field programmable spread spectrum
clock synthesizer generates up to three 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’ VersaClockTM software to configure PLLs
and outputs, the ICS281 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 ICS281 is also available in factory programmed
custom versions for high-volume applications.
Features
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 three reference outputs
Operating voltages of 3.3 V
VDDO output control from 1.8 V to 3.3 V
Controllable output drive levels
Advanced, low-power CMOS process
Available in Pb (lead) free packaging
Block Diagram
Crystal
Oscillator
GND
3
3
VDD
PDTS
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
S2:S0
CLK1
CLK3
CLK2
3
OTP
ROM
with PLL
Values
X2
Crystal or
clock input
External capacitors
are required with a crystal input.
X1/ICLK
PLL1 with
Spread
Spectrum
VDDO


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