Clocks & Timing

Overview

The 542 is cost effective way to produce a high-quality clock output divided from a clock input. The chip accepts a clock input up to 156 MHz at 3.3 V and produces a divide by 2, 4, 6, 8, 12, or 16 of the input clock. There are two outputs on the chip, one being a low-skew divide by two of the other. For instance, if an 100 MHz input clock is used, the 542 can produce low-skew 50 MHz and 25 MHz clocks, or low skew 25 MHz and 12.5 MHz clocks. The chip has an all-chip power-down mode that stops the outputs low, and an OE pin that tri-states the outputs. See the 501, 502, 511, 512, and 525 for clock multipliers.

542 - Block Diagram
542 - Pinout
542 - Block Diagram
542 - Pinout
  • 8-pin SOIC package, Pb free
  • Available in RoHS compliant package
  • IDT's lowest cost clock divider
  • Low skew (500 ps) outputs. One is /2 of the other
  • Easy to use with other generators and buffers
  • Input clock frequency up to 156 MHz
  • Output clock duty cycle of 45/55
  • Power-down turns off chip
  • Output Enable
  • Advanced, low-power CMOS process
  • Operating voltage of 3.3 V or 5 V
  • Does not degrade phase noise - no PLL
  • Available in industrial and commercial temperature ranges

Documentation

Title Type Date
542 Datasheet
PDF224 KB
Datasheet
AN-805 Recommended Ferrite Beads
PDF91 KB
Application Note
AN-827 Application Relevance of Clock Jitter
PDF1.99 MB
Application Note
AN-828 Termination - LVPECL
PDF322 KB
Application Note
AN-844 Termination - AC Coupling Clock Receivers
PDF170 KB
Application Note
AN-845 Termination - LVCMOS
PDF146 KB
Application Note
AN-842 Thermal Considerations in Package Design and Selection
PDF495 KB
Application Note
AN-840 Jitter Specifications for Timing Signals
PDF442 KB
Application Note
AN-834 Hot-Swap Recommendations
PDF153 KB
Application Note
AN-815 Understanding Jitter Units
PDF565 KB
Application Note
PLC# : 220004 End-of-Life (EOL) Process on Select Part Numbers
PDF859 KB
End Of Life Notice
Clock Distribution Overview
PDF217 KB
Overview
IDT Clock Generation Overview
PDF1.83 MB
Overview
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly
PDF611 KB
Product Change Notice
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly
PDF611 KB
Product Change Notice
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages
PDF95 KB
Product Change Notice
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages
PDF50 KB
Product Change Notice
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products
PDF361 KB
Product Change Notice
PCN# : A1208-01R1 Gold to Copper Wire
PDF254 KB
Product Change Notice
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil
PDF223 KB
Product Change Notice

Design & Development

Software Downloads

Title Type Date
PLC# : 220004 End-of-Life (EOL) Process on Select Part Numbers
PDF859 KB
End Of Life Notice

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models

Models

Title Type Date
542 3.3V IBIS Model
ZIP3 KB
Model - IBIS

Product Options

    Processing table
    Part Number
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    542MILF
    block_flippedObsolete
    memory
    view_in_ar
    		8 I Yes Tube
    542MILFT
    infoLast Time Buy
    memory
    view_in_ar
    		8 I Yes Reel
    542MLF
    infoLast Time Buy
    memory
    view_in_ar
    		8 C Yes Tube
    542MLFT
    infoLast Time Buy
    memory
    view_in_ar
    		8 C Yes Reel
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