CDCUN1208LP Ultra Low Power, 2:8 Fan-out Buffer with Universal Inputs and Outputs |


Ultra Low Power, 2:8 Fan-out Buffer with Universal Inputs and Outputs


Recommended alternative parts

  • LMK00308  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Low additive jitter, 1:8 Universal buffer


The CDCUN1208LP is a 2:8 fan-out buffer featuring a wide operating supply range, two universal differential/single-ended inputs, and universal outputs (HCSL, LVDS, or LVCMOS) with edge rate control. The clock buffer supports PCIE gen1, gen2 and gen3. One of the device inputs includes a divider that provides divide values of /1, /2, /4, or /8. The CDCUN1208LP is offered in a 32 pin QFN package reducing the solution footprint. The device is flexible and easy to use. The state of certain pins determines device configuration at power up. Alternately, the CDCUN1208LP provides a SPI/I2C port with which a host processor controls device settings. The CDCUN1208LP delivers excellent additive jitter performance, and low power consumption. The output section includes four dedicated supply pins enabling the operation of output ports from different power supply domains. This provides the ability to clock devices switching at different LVCMOS levels without the need for external logic level translation circuitry.


  • Support PCIE gen1, gen2, gen3
  • Configuration Options (via pins or SPI/I2C):
    • Input Type (HCSL, LVDS, LVCMOS)
    • Output Type (HCSL, LVDS, LVCMOS)
    • Signal Edge Rate (Slow, Medium, Fast)
    • Clock Input Divide Value (/1, /2, /4, /8) – IN2 Only
  • Low Power Consumption and Power Management Features Including 1.8V Operation and Output Enable Control
  • Integrated Voltage Regulators Improve PSNR
  • Excellent Additive Jitter Performance
    • 200 fs RMS (10 kHz to 20 MHz), LVDS at
      100 MHz
    • 160 fs RMS (10 kHz to 20 MHz), HCSL at
      100 MHz
  • Maximum Operating Frequency:
    • Differential Mode: up to 400 MHz
    • LVCMOS Mode: up to 250 MHz
  • ESD Protection Exceeds 2 kV HBM, 500 V CDM
  • Industrial Temperature Range (–40°C to 85°C)
  • Wide Supply Range (1.8 V, 2.5 V, or 3.3 V)

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Parametrics Compare all products in Universal (programmable)

Additive RMS jitter (Typ) (fs)
Output frequency (Max) (MHz)
Input level
Number of outputs
Output level
VCC out (V)
Input frequency (Max) (MHz)
Operating temperature range (C)
-40 to 85    

Design tool

Design with CDCUN1208LP

Input Frequency Output Frequency
 MHz  MHz
  Number of Outputs
  Output Format