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MK74CB218B - Block Diagram
MK74CB218B - Pinout


Dual 1 to 8 Buffalo™ Clock Driver

The MK74CB218B Buffalo™ is a monolithic CMOS high speed clock driver. It consists of two identical single input to eight low-skew output, non-inverting clock drivers. This eliminates concerns of part to part matching in many systems. The MK74CB218B is packaged in the tiny 28-pin SSOP, which uses the same board space as the narrow 16-pin SOIC. The inputs can be connected together for a 1 to 16 fanout buffer. A quad 1 to 4, and PECL versions, are also available. Consult IDT for more details. The MK74CB218B can also act as a voltage translator, since it is possible to run the inputs at 3.3 V and the outputs at 2.5 V.


  • Packaged as 28-pin SSOP (150 mil body)
  • Pb (lead) free package, RoHS compliant
  • Dual one input to eight output clock drivers
  • Outputs are skew matched to within 250 ps
  • A outputs and B outputs matched to 250 ps
  • 2.5 V or 3.3 V output voltages
  • Output Enable tri-states each bank of eight
  • Clock speeds up to 200 MHz

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)Divider ValueOutput Skew (ps)Additive Phase Jitter Typ RMS (ps)
16LVCMOS0.000000 - 200.0000000.000000 - 200.0000002LVCMOS23.32.5, 3.3250

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
MK74CB218BRLFActivePCG28QSOP28CYesTubeCheck Availability
MK74CB218BRLFTRActivePCG28QSOP28CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
MK74CB218B Datasheet Datasheet PDF 169 KB Jan 18, 2013
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 13, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
show all (11)
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-800 Approved VCXO Crystals Application Note PDF 63 KB Jan 28, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
Ferrite Bead Recommendations Application Note PDF 25 KB Mar 9, 2006
PCN# : A1403-03 Gold wire to Copper wire Product Change Notice PDF 42 KB Oct 15, 2014
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016
IDT Fanout Buffers Product Overview Product Brief PDF 739 KB Feb 17, 2015
show all (4)
High-Performance, Low-Phase Noise Clocks Buffers product brief Product Brief PDF 378 KB Aug 14, 2012