Loss-of-Sync Alarm

Complete LOS Alarm Stand-Alone Solution

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The MAX7461 single-channel loss-of-sync alarm (active-low LOS) provides composite video sync detection in NTSC, PAL, and SECAM standard-definition television (SDTV) systems. The MAX7461's advanced detection circuitry delivers robust performance by preventing false loss-of-sync alarms due to noise. The device accepts an AC-coupled composite (CVBS), luma (Y), or any other video signal with sync and outputs a logic-level signal. The open-drain active-low LOS output is low when no sync is detected and high impedance when sync is detected. The device operates from a single +5V supply.

The MAX7461 is available in a 5-pin SOT23 package and is specified for operation over the -40°C to +85°C temperature range.

MAX7461: Functional Diagram MAX7461: Functional Diagram Enlarge+

Key Features

  • Accepts CVBS, Y, or Any Other Video with Sync
  • Loss-of-Sync Alarm Output
  • Robust Performance in Noisy Environments
  • Wire-OR Alarm Output
  • NTSC, PAL, and SECAM
  • Small 5-Pin SOT23 Package


  • Consumer Electronics
  • Security Systems
Product Reliability Reports: MAX7461.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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