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

The 813253 is a PLL based synchronous clock generator that is optimized for Gigabit Ethernet and PCI Express®™ clock jitter attenuation and frequency translation. The device contains two internal frequency multiplication stages that are cascaded in series. The first stage is a VCXO PLL that is optimized to provide reference clock jitter attenuation. The second stage is a FemtoClock® frequency multiplier that provides the low jitter, high frequency Gigabit Ethernet or PCI Express®™ output clock. Pre-divider and output divider multiplication ratios are selected using device selection control pins. The multiplication ratios are optimized to support most common clock rates used in Gigabit Ethernet and PCI Express® applications. The VCXO requires the use of an external, inexpensive pullable crystal. The VCXO uses external passive loop filter components which allows configuration of the PLL loop bandwidth and damping characteristics.

Features

  • Three differential LVPECL output pairs
  • One differential input supports the following input types: LVPECL, LVDS, LVHSTL, HCSL
  • Accepts input frequencies from 19.6MHz to 136MHz, including: 25MHz, 62.5MHz, 100MHz and 125MHz input clocks
  • Attenuates the phase jitter of the input clock by using a low-cost fundamental mode VCXO crystal
  • Outputs common Gigabit Ethernet or PCI Express® clock rates
  • VCXO PLL bandwidth can be optimized for jitter attenuation and reference tracking using external loop filter connection
  • Absolute pull range: ±50ppm
  • FemtoClock frequency multiplier provides low jitter, high frequency output
  • FemtoClock VCO range: 490MHz - 680MHz
  • RMS phase jitter @ 156.25MHz, using a 25MHz crystal (1.875MHz – 20MHz): 0.421ps (typical)
  • Full 3.3V supply, or mixed 3.3V core 2.5V output supply
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Options

下单器件 ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
813253BGLF Obsolete PGG24 TSSOP 24 C Yes Tube
Availability
813253BGLFT Obsolete PGG24 TSSOP 24 C 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
应用指南 &白皮书
AN-828 Termination - LVPECL Application Note PDF 322 KB
AN-831 The Crystal Load curve Application Note PDF 395 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 442 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 115 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 120 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 160 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 143 KB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 136 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
AN-801 Crystal-High Drive Level Application Note PDF 202 KB
PCN / PDN
PDN# : CQ-14-03 Quarter PDN for Declined Market Product Discontinuation Notice PDF 539 KB