SY89838U - Micrel Semiconductor

SY89838U Precision 1:8 LVDS Clock Fanout Buffer

The SY89838U is a low jitter, low skew, high-speed 1:8 fanout buffer with a unique, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89838U unique 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or “runt” pulses during switchover. In addition, a unique fail-safe.

Features

Precision Edge®
• Selects between two clocks, and provides 8 precision, low skew LVDS output copies
• 2:1 MUX input provides a glitch-free, stable LVDS output
• Guaranteed AC performance over temperature and supply voltage:
  – Wide operating frequency: 1kHz to >1.5GHz
  – <150ps tr/tf
  – <40ps output-to-output skew
• Unique patent-pending input isolation design minimizes crosstalk
• Fail-safe input prevents oscillation
• Ultra-low jitter design:
  – 150fs RMS phase jitter
  – <0.7psRMS MUX crosstalk induced jitter
• Unique patent-pending input termination and VT pin accepts DC- and AC-coupled inpu.