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.


  • 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


製品名 Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type 購入/サンプル
Active SOIC 8 I はい Tube
Active SOIC 8 I はい Reel
Active SOIC 8 C はい Tube
Active SOIC 8 C はい Reel


タイトル language 分類 形式 サイズ 日付
542 Datasheet データシート PDF 224 KB
AN-828 Termination - LVPECL アプリケーションノート PDF 322 KB
AN-845 Termination - LVCMOS アプリケーションノート PDF 146 KB
AN-844 Termination - AC Coupling Clock Receivers アプリケーションノート PDF 170 KB
AN-842 Thermal Considerations in Package Design and Selection アプリケーションノート PDF 495 KB
AN-840 Jitter Specifications for Timing Signals アプリケーションノート PDF 442 KB
AN-834 Hot-Swap Recommendations アプリケーションノート PDF 153 KB
AN-827 Application Relevance of Clock Jitter アプリケーションノート PDF 1.15 MB
AN-815 Understanding Jitter Units アプリケーションノート PDF 565 KB
AN-805 Recommended Ferrite Beads アプリケーションノート PDF 121 KB
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly 製品変更通知 PDF 611 KB
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly 製品変更通知 PDF 611 KB
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages 製品変更通知 PDF 95 KB
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages 製品変更通知 PDF 50 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products 製品変更通知 PDF 361 KB
PCN# : A1208-01R1 Gold to Copper Wire 製品変更通知 PDF 254 KB
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil 製品変更通知 PDF 223 KB
542 3.3V IBIS Model モデル-IBIS ZIP 3 KB
IDT Clock Distribution Overview (Japanese) English 概要 PDF 7.79 MB
IDT Clock Generation Overview (Japanese) English 概要 PDF 2.19 MB