Overview

The 87951I is a low voltage, low skew 1-to-9 Differential-to-LVCMOS/LVTTL Cock Generator. The CS87951I has two selectable clock inputs. The single ended clock input accepts LVCMOS or LVTTL input levels. The CLK1, nCLK1 pair can accept most standard differential input levels. With output frequencies up to 180MHz, the 87951I is targeted for high performance clock applications. Along with a fully integrated PLL, the 87951I contains frequency configurable outputs and an external feedback input for regenerating clocks with "zero delay".

87951I - Block Diagram
87951I - Pinout
87951I - Block Diagram
87951I - Pinout
  • Fully integrated PLL
  • Nine single ended 3.3V LVCMOS/LVTTL outputs
  • Selectable single ended CLK0 or differential CLK1, nCLK1 inputs
  • The single ended CLK0 input can accept the following input levels: LVCMOS or LVTTL input levels
  • CLK1, nCLK1 supports the following input types: LVDS, LVPECL, LVHSTL, SSTL, HCSL
  • Output frequency range: 25MHz to 180MHz
  • VCO range: 200MHz to 480MHz
  • External feedback for "zero delay" clock regeneration
  • Cycle-to-cycle jitter: ±100ps (typical)
  • Output skew: 375ps (maximum)
  • PLL reference zero delay: 350ps window (maximum)
  • 3.3V operating supply
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free RoHS-compliant 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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Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    87951AYILF
    circleObsolete
    memory
    view_in_ar
    		TQFP 32 I Yes Tray
    87951AYILFT
    circleObsolete
    memory
    view_in_ar
    		TQFP 32 I Yes Reel
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