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CY29940, 2.5 V or 3.3 V, 200 MHz, 1:18 Clock Distribution Buffer | Cypress Semiconductor

CY29940, 2.5 V or 3.3 V, 200 MHz, 1:18 Clock Distribution Buffer

Last Updated: 
Nov 27, 2017

2.5 V or 3.3 V, 200-MHz, 1:18 Clock Distribution Buffer


  • 200-MHz clock support
  • LVPECL or LVCMOS/LVTTL clock input
  • LVCMOS/LVTTL compatible inputs
  • 18 clock outputs: drive up to 36 clock lines
  • 60 ps typical output-to-output skew
  • Dual or single supply operation:
    • 3.3 V core and 3.3 V outputs
    • 3.3 V core and 2.5 V outputs
    • 2.5 V core and 2.5 V outputs
  • Pin compatible with MPC940L, MPC9109
  • Available in Commercial and Industrial temperature
  • 32-pin TQFP package


The CY29940 is a low-voltage 200-MHz clock distribution buffer with the capability to select either a differential LVPECL or a  LVCMOS/LVTTL compatible input clock. The two clock sources  can be used to provide for a test clock as well as the primary  system clock. All other control inputs are LVCMOS/LVTTL compatible. The eighteen outputs are 2.5 V or 3.3 V  LVCMOS/LVTTL compatible and can drive 50 Ω series or parallel  terminated transmission lines. For series terminated  transmission lines, each output can drive one or two traces giving  the device an effective fanout of 1:36. Low output-to-output  skews make the CY29940 an ideal clock distribution buffer for  nested clock trees in the most demanding of synchronous  systems.