Overview

The 843256I is a Crystal-to-3.3V LVPECL Clock Synthesizer/Fanout Buffer designed for Fibre Channel and Gigabit Ethernet applications. The output frequency can be set using the frequency select pins and a 25MHz crystal for Ethernet frequencies, or a 19.44MHz crystal for SONET. The low phase noise characteristics of the 843256I make it an ideal clock for these demanding applications.

843256I - Block Diagram
843256I - Pinout
843256I - Block Diagram
843256I - Pinout
  • Six 3.3V differential LVPECL output pairs
  • Output frequency range: 62.5MHz to 625MHz
  • Crystal input frequency range: 15.625MHz to 25.5MHz
  • RMS phase jitter at 156.25MHz, using a 25MHz crystal (1.875MHz to 20MHz): 0.41ps (typical) @ 3.3V
  • Operating supply modes: Core/Output 3.3V/3.3V 3.3V/2.5V
  • -40°C to 85°C ambient operating temperature
  • Available in  lead-free (RoHS 6) package

Documentation

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    843256BGILF
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 I Yes Tube
    843256BGILFT
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 I Yes Reel
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