NOTICE - The following device(s) are recommended alternatives:

The 845252I 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. The device is a member of the family of High Performance Clock Solutions from IDT.

特性

  • 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

产品选择

下单器件型号 Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete VFQFPN 32 I 是的 Tray
Availability
Obsolete VFQFPN 32 I 是的 Reel
Availability

文档和下载

文档标题 其他语言 类型 文档格式 文件大小 日期
数据手册与勘误表
845252 Datasheet 数据手册 PDF 306 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-842 Thermal Considerations in Package Design and Selection 应用文档 PDF 495 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products 应用文档 PDF 128 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-834 Hot-Swap Recommendations 应用文档 PDF 153 KB
AN-837 Overdriving the Crystal Interface 应用文档 PDF 133 KB
AN-832 Timing Budget and Accuracy 应用文档 PDF 131 KB
AN-836 Differential Input to Accept Single-ended Levels 应用文档 PDF 120 KB
AN-835 Differential Input with VCMR being VIH Referenced 应用文档 PDF 160 KB
AN-830 Quartz Crystal Drive Level 应用文档 PDF 143 KB
AN-827 Application Relevance of Clock Jitter 应用文档 PDF 1.15 MB
AN-815 Understanding Jitter Units 应用文档 PDF 565 KB
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-806 Power Supply Noise Rejection 应用文档 PDF 438 KB
AN-805 Recommended Ferrite Beads 应用文档 PDF 121 KB
PCN / PDN
PDN# : CQ-15-05 Market Declined Quarterly PDN 产品停产通告 PDF 623 KB
下载
845252I IBIS Model 模型 - IBIS ZIP 68 KB
其他
Clock Distribution Overview 日本語 概览 PDF 217 KB
Timing Solutions Products Overview 概览 PDF 4.11 MB
IDT Products for Radio Applications 日本語 产品简述 PDF 2.34 MB
IDT Clock Generation Overview 日本語 概览 PDF 1.83 MB