The 840NT4-01I is clock generator designed to provide ethernet and USB clocks for Freescale B4/ T4-based systems. The 840NT4-01I utilizes Renesas' FemtoClock NG® PLL technology to synthesize eight low phase-jitter Ethernet reference clocks. The clock generator also provides a 24MHz USB reference clock and a 25MHz reference output.


  • Ten LVCMOS clock outputs:
    • Five LVCMOS 125MHz Ethernet outputs
    • Three LVCMOS 25MHz /125MHz Ethernet outputs
    • One LVCMOS 24MHz USB output
    • One LVCMOS 25MHz REF output
  • QREF output; can be used to drive X1 of other devices, saving a crystal
  • Selectable crystal input, or differential LVPECL input; test mode
  • RMS Phase Jitter, 125MHz, integration range 12kHz – 20MHz: 0.75ps (typical)
  • Cycle-to-Cycle jitter: 75ps (typical)
  • Flexible voltage supply modes; supports legacy and future system requirements, minimizes power consumption
  • Core voltage: (VDD, VDD_XTAL, VDDA) / 
    Output voltage: (VDDO_A, VDDO_B, VDDO_C, VDDO_REF)
    Core / Output
    3.3V / 3.3V
    3.3V / 2.5V
    3.3V / 1.8V
    2.5V / 2.5V
    2.5V / 1.8V
  • -40°C to +85°C ambient operating temperature
  • Space-saving Pb-free, 48-pin 7 × 7 mm QFN; minimal board space
  • Lead-free (RoHS 6) packaging


器件号 Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Active VFQFPN 48 I 是的 Tray
Active VFQFPN 48 I 是的 Reel


文档标题 language 类型 文档格式 文件大小 日期
star 840NT4-01 Datasheet 数据手册 PDF 760 KB
应用指南 & 白皮书
AN-828 Termination - LVPECL 应用文档 PDF 322 KB
AN-831 The Crystal Load curve 应用文档 PDF 395 KB
AN-844 Termination - AC Coupling Clock Receivers 应用文档 PDF 170 KB
AN-845 Termination - LVCMOS 应用文档 PDF 146 KB
AN-842 Thermal Considerations in Package Design and Selection 应用文档 PDF 495 KB
AN-840 Jitter Specifications for Timing Signals 应用文档 PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations 应用文档 PDF 115 KB
AN-839 RMS Phase Jitter 应用文档 PDF 233 KB
AN-832 Timing Budget and Accuracy 应用文档 PDF 131 KB
AN-833 Differential Input Self Oscillation Prevention 应用文档 PDF 180 KB
AN-834 Hot-Swap Recommendations 应用文档 PDF 153 KB
AN-835 Differential Input with VCMR being VIH Referenced 应用文档 PDF 160 KB
AN-836 Differential Input to Accept Single-ended Levels 应用文档 PDF 120 KB
AN-837 Overdriving the Crystal Interface 应用文档 PDF 133 KB
AN-830 Quartz Crystal Drive Level 应用文档 PDF 143 KB
AN-815 Understanding Jitter Units 应用文档 PDF 565 KB
AN-827 Application Relevance of Clock Jitter 应用文档 PDF 1.15 MB
AN-802 Crystal-Measuring Oscillator Negative Resistance 应用文档 PDF 136 KB
AN-801 Crystal-High Drive Level 应用文档 PDF 202 KB
AN-805 Recommended Ferrite Beads 应用文档 PDF 121 KB
AN-806 Power Supply Noise Rejection 应用文档 PDF 438 KB
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products 应用文档 PDF 108 KB
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility 产品变更通告 PDF 983 KB
PCN# : W1308-01 Change of Passivation Thickness 产品变更通告 PDF 941 KB
IDT Clock Generation Overview 日本語 概览 PDF 1.83 MB


文档标题 language 类型 文档格式 文件大小 日期
840NT4-01i IBIS Model 模型 - IBIS ZIP 110 KB