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181-03 - Block Diagram
181-03 - Pinout


Low EMI Clock Generator

The 181-03 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. The 181-03 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. IDT offers a complete line of EMI reducing clock generators. Consult us when you need to remove crystals and oscillators from your board.


  • 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
  • Input frequency of 46 to 75 MHz for Clock input
  • Peak reduction by 7dB - 14dB typical on 3rd - 19th odd harmonics
  • Spread percentage selection for -1.25% and -3.75%
  • Operating voltage of 3.3 V and 5 V
  • Advanced, low-power CMOS process

Product Specification

Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
LVCMOS46.000000 - 75.00000046.000000 - 75.0000001LVCMOS13.3, 53.3, 5

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
181M-03LFObsoleteDCG8SOIC8CYesTubeCheck Availability
181M-03LFTObsoleteDCG8SOIC8CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
181-03 Datasheet Datasheet PDF 143 KB May 14, 2010
PDN# : U-13-05R2 PRODUCT DISCONTINUANCE NOTICE (REVISED) Product Discontinuation Notice PDF 161 KB Oct 29, 2013
PCN# : A1309-01 Changed of Traceability Mark Format Product Change Notice PDF 439 KB Oct 11, 2013
PDN# : U-13-05R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 161 KB Jul 25, 2013
show all (6)
PDN# : U-13-05 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 159 KB Apr 10, 2013
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil Product Change Notice PDF 223 KB Oct 6, 2006