Overview

The 8R45252I is a 3.3V,2.5V CML clock generator designed for Ethernet applications. The device synthesizes either a 50MHz, 62.5MHz, 100MHz, 125MHz, 156.25MHz, 250MHz or 312.5MHz clock signal with excellent phase jitter performance. The clock signal is distributed to two low-skew differential CML outputs. The device is suitable for driving the reference clocks of Ethernet PHYs. The device supports 3.3V and 2.5V voltage supply and is packaged in a small, lead-free (RoHS 6) 32-lead VFQFN package. The extended temperature range supports telecommunication, wireless infrastructure and networking end equipment requirements. 

8R45252I - Block Diagram
8R45252I - Pinout
8R45252I - Block Diagram
8R45252I - Pinout
  • Clock generation of: 50MHz, 62.5MHz, 100MHz, 125MHz, 156.25MHz, 250MHz and 312.5MHz
  • Two differential CML clock output pairs
  • Crystal interface designed for 25MHz, 18pF parallel resonant crystal
  • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz – 20MHz): 400fs (typical), 3.3V
    Offset                        Noise Power
      100Hz.................... -102.4 dBc/Hz
        1kHz.................... -119.4 dBc/Hz
      10kHz.................... -124.8 dBc/Hz
    100kHz.................... -125.7 dBc/Hz
  • LVCMOS interface levels for the control inputs
  • Full 3.3V and 2.5V supply voltage
  • Available in lead-free (RoHS 6) 32 VFQFN package
  • -40°C to 85°C ambient operating temperature

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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Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    8R45252AKILF
    circleObsolete
    memory
    view_in_ar
    		VFQFPN 32 I Yes Tray
    8R45252AKILFT
    circleObsolete
    memory
    view_in_ar
    		VFQFPN 32 I Yes Reel
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