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MK2745-21 - Block Diagram
MK2745-21 - Pinout


DVD/MPEG Clock Source

The MK2745-21 is a low-cost, low-jitter, high-performance clock synthesizer for DVD and other MPEG 2-based applications. Using analog Phase-Locked Loop (PLL) techniques, the device accepts a 27 MHz fundamental mode crystal or clock input to produce multiple audio output clocks, a processor clock, the processor clock divided by two, 27 MHz, 24.576 MHz, and a selectable audio clock. The audio clocks are frequency-locked to the 27 MHz using our patented zero ppm error techniques. This allows audio and video to track exactly, thereby eliminating the need for large buffer memory. IDT manufactures a large variety of DVD, Set-top Box, and multimedia clock synthesizers for all applications. Consult IDT to eliminate crystals and oscillators from your board.


  • Packaged in a 16-pin narrow (150 mil) SOIC
  • Ideal for LuxSonor’s DVD solutions
  • 3.3 V upgrade to the MK2744
  • Patented zero ppm audio clock error for 256x and 384x sampling rates
  • Selectable audio sampling frequencies support 32, 44.1, and 48 kHz in most DACs
  • 27 MHz fundamental crystal or clock input
  • Eight selectable processor frequencies
  • Fixed clocks of 27 and 24.576 MHz
  • Zero ppm in all clocks
  • 25 mA output drive capability at TTL levels
  • Advanced, low-power, sub-micron CMOS process
  • Operating voltage of 3.0 V to 5.5 V
  • See also the MK2712 for NTSC/PAL clocks

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)
5LVCMOS8.192000 - 80.00000027.0000001LVCMOS, Crystal53.3, 53.3, 5

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
MK2745-21SLFObsoleteDCG16SOIC16CYesTubeCheck Availability
MK2745-21SLFTRObsoleteDCG16SOIC16CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
MK2745-21 Datasheet Datasheet PDF 187 KB May 17, 2010
Apps Notes & White Papers
AN-800 Approved VCXO Crystals Application Note PDF 63 KB Jan 28, 2014
Using IDT's Integrated VCXO Products MAN05 Application Note PDF 69 KB Jun 6, 2012
PDN# : CQ-15-01 (R1) Quarter PDN for Declined Market Product Discontinuation Notice PDF 550 KB Mar 11, 2015
PDN# : CQ-15-01 Quarter PDN for Declined Market Product Discontinuation Notice PDF 547 KB Jan 23, 2015
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 21, 2012