时钟和时序

概览

The 844246D is a Crystal-to-LVDS Clock Synthesizer/Fanout Buffer designed for Fibre Channel frequencies and Gigabit Ethernet applications. The output frequency can be set using the frequency select pins and a 25MHz crystal for Ethernet frequencies, or a 26.5625MHz crystal for a Fibre Channel. The low phase noise characteristics of the 844246D make it an ideal clock for these demanding applications.
844246D - Block Diagram
844246D - Pinout
844246D - Block Diagram
844246D - Pinout
  • Six LVDS output pairs
  • Crystal oscillator interface
  • Output frequency range: 50MHz to 333.3333MHz
  • Crystal input frequency range: 25MHz to 33.333MHz
  • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.416ps (typical)
  • Full 3.3V or mixed 3.3V core, 2.5V output supply modes
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

文档

文档标题 类型 日期
ICS844246D Datasheet
PDF1.08 MB
数据手册
AN-805 Recommended Ferrite Beads
PDF91 KB
应用文档
AN-827 Application Relevance of Clock Jitter
PDF1.99 MB
应用文档
AN-828 Termination - LVPECL
PDF322 KB
应用文档
AN-831 The Crystal Load curve
PDF395 KB
应用文档
AN-846 Termination - LVDS
PDF133 KB
应用文档
AN-842 Thermal Considerations in Package Design and Selection
PDF495 KB
应用文档
AN-840 Jitter Specifications for Timing Signals
PDF442 KB
应用文档
AN-838 Peak-to-Peak Jitter Calculations
PDF115 KB
应用文档
AN-839 RMS Phase Jitter
PDF233 KB
应用文档
AN-832 Timing Budget and Accuracy
PDF131 KB
应用文档
AN-834 Hot-Swap Recommendations
PDF153 KB
应用文档
AN-837 Overdriving the Crystal Interface
PDF133 KB
应用文档
AN-830 Quartz Crystal Drive Level
PDF143 KB
应用文档
AN-815 Understanding Jitter Units
PDF565 KB
应用文档
AN-802 Crystal-Measuring Oscillator Negative Resistance
PDF136 KB
应用文档
AN-801 Crystal-High Drive Level
PDF202 KB
应用文档
AN-806 Power Supply Noise Rejection
PDF438 KB
应用文档
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products
PDF108 KB
应用文档
PDN# : CQ-16-04 QUARTER MARKET DECLINED PDN
PDF560 KB
End Of Life Notice
PCN# : A1606-02 Add Greatek Taiwan as Alternate Assembly
PDF567 KB
产品变更通告
PCN# : A1309-01 Changed of Traceability Mark Format
PDF439 KB
产品变更通告
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products
PDF361 KB
产品变更通告

设计和开发

软件下载

文档标题 类型 日期
PDN# : CQ-16-04 QUARTER MARKET DECLINED PDN
PDF560 KB
End Of Life Notice

ECAD 模块

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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产品选择

    Processing table
    器件号
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    购买 / 样片
    844246DGLF
    block_flippedObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Tube
    844246DGLFT
    block_flippedObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Reel
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