Overview

Description

The 844256D is a Crystal-to-LVDS Clock Synthesizer/Fanout Buffer designed for SONET and Gigabit Ethernet applications. The output frequency can be set using the frequency select pins and a 25MHz crystal for Ethernet frequencies, or a 19.44MHz crystal for SONET. The low phase noise characteristics of the 844256D make it an ideal clock for these demanding applications.

Features

  • Six differential LVDS output pairs
  • Crystal oscillator interface
  • Output frequency range: 62.5MHz - 625MHz
  • Crystal input frequency range:15.625MHz - 25.5MHz
  • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz – 20MHz): 0.43ps (typical)
  • Full 3.3V or mixed 3.3V core, 2.5V output supply mode
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Comparison

Applications

Documentation

Design & Development

Models