GS1535-CFUE3-LOS

Video Processing Overview

The GS1535-CFUE3-LOS is a multi-rate serial digital automatic reclocker designed for SMPTE 292M, 259M, and 344M compliant signals. It supports data rates of 143, 177, 270, 360, 540, 1483.5, and 1485 Mb/s, as well as DVB-ASI at 270 Mb/s. The device features a 4:1 input multiplexor, on-chip 50Ω termination, and LVPECL outputs. It operates on a single 3.3V supply within a temperature range of 0°C to 70°C.

Video Processing Feature Summary

• Integrates a slew rate phase lock loop (S-PLL) with frequency and phase acquisition loops to recover embedded clocks and re-time data while removing high-frequency jitter components from bit-serial streams.
• Includes a 4:1 input multiplexor allowing connection of four independent video or data streams, selectable via logic pins, with configurable automatic mute or bypass when the PLL is not locked.
• Supports both automatic and manual data rate selection modes; in auto mode, it detects incoming standards, while manual mode allows forced locking to specific rates using external SS pins.

Video Processing Applications

• SMPTE 292M Serial Digital Interfaces
• SMPTE 259M Serial Digital Interfaces
• SMPTE 344M Serial Digital Interfaces

Video Processing Procurement Notes

Verify that the ordering suffix CFUE3 corresponds to the Pb-free and Green package variant as specified in the datasheet. Confirm the LOS designation aligns with distributor-specific stock or lot codes rather than functional changes. Ensure compatibility with the required 14.140 MHz reference crystal and check for any obsolete status updates from Gennum or Semtech.

Video Processing Selection Notes

Select this component for applications requiring retiming of SD and HD serial digital video signals. It is suitable for systems needing a 4:1 input mux and seamless interfacing with cable drivers like the GS1528. Consider the 64-pin LQFP package constraints and the requirement for an external 14.140 MHz crystal for VCO centering during frequency acquisition.

Video Processing Part Context

Manufactured by Gennum Corporation, now part of Semtech, the GS1535 belongs to the HD-LINX II family of serial digital processors. It serves as a critical interface component in professional broadcast and post-production environments, ensuring signal integrity by cleaning jitter before transmission over long cables or distribution networks.

Video Processing Replacement Considerations

The GS1535-CFU is the non-Pb-free equivalent of the GS1535-CFUE3. No other direct functional substitutes are documented in the provided source material.

Video Processing FAQ

How does the GS1535 handle non-SMPTE data rates?

In both auto and manual modes, the GS1535 can enter a bypass mode to pass non-SMPTE data rates without reclocking them.

What is the function of the ASI/177 pin?

When set HIGH, the ASI/177 pin disables the 177 Mb/s search in auto mode to prevent false locking caused by harmonics present in DVB/ASI idle patterns.