ICS181-03
Low EMI Clock Generator
Description
The ICS181-03 generates a low EMI output clock from
a clock or crystal input. The device uses ICS’
proprietary mix of analog and digital Phase-Locked
Loop (PLL) technology to spread the frequency
spectrum of the output, thereby reducing the frequency
amplitude peaks by several dB.
The ICS181-03 offers down spread selection of -1.25%
and -3.75%. Refer to the MK1714-01/02 for the widest
selection of input frequencies and multipliers.
ICS offers a complete line of EMI reducing clock
generators. Consult us when you need to remove
crystals and oscillators from your board.
Features
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Pin and function compatible to Cypress W181-03
Packaged in 8-pin SOIC
Provides a spread spectrum output clock
Accepts a clock input and provides same frequency
dithered output
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Input frequency of 46 to 75 MHz for Clock input
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Peak reduction by 7dB - 14dB typical on 3rd - 19th
odd harmonics
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Spread percentage selection for -1.25% and -3.75%
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Operating voltage of 3.3 V and 5 V
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Advanced, low-power CMOS process
Block Diagram
VDD
FS1
SSON#
SS%
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
Clock Buffer
CLK
CLK
GND
MDS 181-03 A
1
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Revision 110404
tel (408 ) 29 7-120 1
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I n t e gra t e d C i r cu i t S y s t e m s
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5 25 Race Street, San Jo se, CA 9 512 6
w w w. i c st . c o m
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
