Clock buffer with programmable divider, LVPECL I/O and LVCMOS output


Product details


Function Clock divider, Fanout Additive RMS jitter (Typ) (fs) 150 Output frequency (Max) (MHz) 800 Number of outputs 1 Output supply voltage (V) 3.3 Core supply voltage (V) 3.3 Output skew (ps) 1600 Features Pin programmable Operating temperature range (C) -40 to 85 Rating Catalog Output type LVCMOS, LVPECL Input type LVPECL open-in-new Find other Clock buffers

Package | Pins | Size

VQFN (RGT) 16 9 mm² 3 x 3 open-in-new Find other Clock buffers


  • Distributes One Differential Clock Input to One LVPECL Differential Clock Output and One LVCMOS Single-Ended Output
  • Programmable Output Divider for Both LVPECL and LVCMOS Outputs
  • 1.6-ns Output Skew Between LVCMOS and LVPECL Transitions Minimizing Noise
  • 3.3-V Power Supply (2.5-V Functional)
  • Signaling Rate Up to 800-MHz LVPECL and
    200-MHz LVCMOS
  • Differential Input Stage for Wide Common-Mode Range Also Provides VBB Bias Voltage Output for Single-Ended Input Signals
  • Receiver Input Threshold ±75 mV
  • 16-Pin VQFN Package (3.00 mm × 3.00 mm)

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The CDCM1802 clock driver distributes one pair of differential clock input to one LVPECL differential clock output pair, Y0 and Y0, and one single-ended LVCMOS output, Y1. It is specifically designed for driving 50-Ω transmission lines. The LVCMOS output is delayed by 1.6 ns over the PECL output stage to minimize noise impact during signal transitions.

The CDCM1802 has two control pins, S0 and S1, to select different output mode settings. The S[1:0] pins are 3-level inputs. Additionally, an enable pin EN is provided to disable or enable all outputs simultaneously. The CDCM1802 is characterized for operation from −40°C to 85°C.

For single-ended driver applications, the CDCM1802 provides a VBB output pin that can be directly connected to the unused input as a common-mode voltage reference.

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Type Title Date
* Data sheet CDCM1802 Clock Buffer With Programmable Divider, LVPECL I/O + Additional LVCMOS Output datasheet (Rev. C) Jul. 06, 2017
Application note CDCM1802/CDCM1804 Aug. 04, 2004

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VQFN (RGT) 16 View options

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