The ICS581-02 is a glitch free, Phase Locked Loop (PLL) based clock multiplexers (mux) with zero delay from input to output. This device has four low skew outputs which can be configured as a single output, three outputs, or four outputs. The ICS581-02 has automatic switching between the two clock inputs. The ICS581-02 is a member of IDT’s ClockBlocksTM family of clock generation, synchronization, and distribution devices.


  • 16-pin TSSOP package 
  • RoHS compliant packaging
  • No short pulses or glitches on output
  • Operates from 6 to 200 MHz
  • Low skew outputs
  • User controlled (-01) or automatic, timed mux switch (-02)
  • Ideal for systems with back-up or redundant clocks
  • Zero delay (input to output)
  • 50% output duty cycle allows duty cycle correction
  • SpreadSmartTM technology works with spread spectrum parts
  • Industrial temperature available

Product Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete TSSOP 16 I Yes Tube
Obsolete TSSOP 16 I Yes Reel
Obsolete TSSOP 16 C Yes Tube
Obsolete TSSOP 16 C Yes Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
581-01/02 Datasheet Datasheet PDF 205 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-845 Termination - LVCMOS Application Note PDF 146 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 170 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-834 Hot-Swap Recommendations Application Note PDF 153 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PCN# : TB1403-01 Changed in Carrier Tape, Plastic Reel and Quantity per Reel on TSSOP-14, TSSOP-16 Product Change Notice PDF 663 KB
PDN# : U-13-05R2 PRODUCT DISCONTINUANCE NOTICE (REVISED) Product Discontinuation Notice PDF 161 KB
PDN# : U-13-05R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 161 KB
PDN# : U-13-05 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 159 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB
581-02 3.3V IBIS Model Model - IBIS ZIP 3 KB
581-02 5.0V IBIS Model Model - IBIS ZIP 3 KB
Clock Distribution Overview 日本語 Overview PDF 217 KB