DATASHEET
LOW EMI CLOCK GENERATOR
ICS181-01
Description
Features
The ICS181-01 generates a low EMI output clock from
a clock or crystal input. The device uses IDT’s
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.
• Pin and function compatible to Cypress W181-01
• Packaged in 8-pin SOIC
• Provides a spread spectrum output clock
• Accepts a clock input and provides same frequency
dithered output
• Input frequency of 28 to 75 MHz for Clock input
The ICS181-01 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.
• Peak reduction by 7dB - 14dB typical on 3rd - 19th
odd harmonics
IDT offers a complete line of EMI reducing clock
generators. Consult us when you need to remove
crystals and oscillators from your board.
• Spread percentage selection for -1.25% and -3.75%
• Operating voltage of 3.3 V and 5 V
• Available in Pb (lead) free package
• Industrial temperature range available
• Advanced, low-power CMOS process
NOTE: EOL for non-green parts to occur on
5/13/10 per PDN U-09-01
Block Diagram
VDD
FS2:1
SS%
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
CLK
X1/CLKIN
Clock Buffer/
Crystal
Oscillator
X2
GND
IDT™ / ICS™ LOW EMI CLOCK GENERATOR
1
ICS181-01
REV C 081009
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
