Overview

The 9LPRS477 is a main clock synthesizer chip that provides all clocks required for ATI RD7xx-based systems using AMD processors. An SMBus interface allows full control of the device.

9LPRS477 - Block Diagram
9LPRS477 - Pinout
9LPRS477 - Block Diagram
9LPRS477 - Pinout
  • Features/Benefits
    • CPU, ATIG, SB_SRC, and SRC outputs are independently programmable for frequency
    • Spread Spectrum for EMI reduction
    • Outputs may be disabled via SMBus
    • External crystal load capacitors for maximum frequency accuracy
    • Meets PCIEX Gen 2 specifications
    • Meets 30kHz to 33kHz SRC modulation rate specification for USB 3.0
  • Key Specifications
    • CPU outputs cycle-to-cycle jitter < 85ps
    • SRC outputs cycle-to-cycle jitter < 125ps
    • ATIG outputs cycle-to-cycle jitter < 125ps
    • ± 300ppm frequency accuracy on CPU, SRC, and ATIG clocks

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
    9LPRS477CKLF
    circleObsolete
    memory
    view_in_ar
    		VFQFPN 64 C Yes Tray
    9LPRS477CKLFT
    circleObsolete
    memory
    view_in_ar
    		VFQFPN 64 C Yes Reel
    9LPRS477DKLF
    circleObsolete
    memory
    view_in_ar
    Buy Now
    		VFQFPN 64 C Yes Tray
    9LPRS477DKLFT
    circleObsolete
    memory
    view_in_ar
    		VFQFPN 64 C Yes Reel
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