NOTICE - The following device(s) are recommended alternatives:
The 840N021 is a LVCMOS/LVTTL clock synthesizer designed for Ethernet applications. The device generates a 125MHz clock signal from a 25MHz crystal with excellent phase jitter performance. The device uses IDT’s fourth generation FemtoClock® NG technology for an optimum of high clock frequency, low phase noise performance and low power consumption.The device supports 2.5V or 3.3V voltage supply and is packaged in a small, lead-free (RoHS 6) 8-lead TSSOP package. The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements. The device is a member of the high-performance clock family from IDT.

Features

  • Fourth generation FemtoClock® NG technology
  • 125MHz output clock synthesized from a 25MHz fundamental mode crystal
  • One 2.5V or 3.3V LVCMOS/LVTTL clock output
  • Crystal interface designed for a 12pF parallel resonant crystal
  • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.156ps (maximum)
  • RMS phase jitter @ 100MHz, using a 20MHz crystal (12kHz - 20MHz): 0.451ps (maximum)
  • LVCMOS interface level for the output enable input
  • Full 2.5V or 3.3V supply voltage
  • Lead-free (RoHS 6) packaging
  • -40°C to 85°C ambient operating temperature​

Product Options

下单器件 ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
840N021BGILF Obsolete PGG8 TSSOP 8 I Yes Tube
Availability
840N021BGILFT Obsolete PGG8 TSSOP 8 I Yes Reel
Availability

技术资料

文档标题 他の言語 文档类型 文档格式 文件大小
数据手册与勘误表
840N021 Datasheet Datasheet PDF 262 KB
应用指南 &白皮书
AN-828 Termination - LVPECL Application Note PDF 229 KB
AN-831 The Crystal Load curve Application Note PDF 308 KB
AN-845 Termination - LVCMOS Application Note PDF 62 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB
AN-839 RMS Phase Jitter Application Note PDF 149 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB
AN-837 Overdriving the Crystal Interface Application Note PDF 50 KB
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB
AN-815 Understanding Jitter Units Application Note PDF 476 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB
AN-801 Crystal-High Drive Level Application Note PDF 109 KB
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB
PCN / PDN
PDN# : CQ-15-04 Quarterly Market Declined PDN Product Discontinuation Notice PDF 545 KB
其它
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Products for Radio Applications 日本語 Product Brief PDF 2.34 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB