Diodes Incorporated
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PI6LC48P21 (Obsolete)

Single output LVPECL Clock Generator

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Product Description

The PI6LC48P21 is a single output LVPECL synthesizer opti- mized to generate Ethernet reference clock frequencies and is a member of Diodes' HiFlex family of high performance clock solutions. Using a 25MHz or 26.6MHz crystal, it can generate 125MHz or 133MHz output frequencies.

The PI6LC48P21 uses Diodes' proprietary low phase noise PLL technology to achieve ultra low phase jitter, so it is ideal for Ethernet interface in all kind of systems. 


  • Single differential LVPECL output
  • Supports the following output frequencies: 125MHz or 133MHz
  • RMS phase jitter @ 125MHz, using a 25MHz crystal (12kHz – 20MHz): 0.3ps (typical)
  • Full 3.3V or 2.5V supply modes
  • Commercial and industrial ambient operating temperature
  • Available in lead-free package: 8-TSSOP 


  • Networking systems 

Product Specifications

Product Parameters

Compliance (Only Automotive(Q) supports PPAP) Standard
Input Type(s) Crystal, CMOS
Additive Jitter (ps) 0.3
Number of Outputs 1
Maximum Output Frequency (MHz) 1x 125, 133 MHz
Output Type(s) LVPECL
Skew (PS) 0
Supply Voltage (V) 2.5, 3.3
Supported Frequencies (MHz) 125, 133
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Recommended Soldering Techniques




What is LVPECL clock and its termination?

LVPECL is Low Voltage Positive (supply) Emitter Couple Logic. Its voltage level is around 2V+/-400mV and the most use termination is 150 ohm pull-down at output pin and AC or DC coupling to an equivalent 100 ohm across pair at RX ASIC side. Check ASIC datasheet  to prevent double termination.