Products - Automotive

XD6121-24 CMOS Voltage Detector with Watchdog

CMOS Voltage Detector with Watchdog image


Property XD6121-24
Type Watchdog with ON/OFF Control
Detect Voltage 1.6V ~ 4.6V
Accuracy ± 2%
Operating Voltage 1.0V ~ 6.0V
Supply Current 5µA (typ.)
Ouput N-ch Open Drain
Packages SOT-25

Product Description

XD6121-24 CMOS Voltage Detector with Watchdog

  • ON/OFF Control
  • Watchdog
  • Built-In Delay

The XD6121/XD6122/XD6123/XD6124 series are highly accurate, low power consumption CMOS voltage detectors with an integrated watchdog function and EN pin for turning the watchdog ON and OFF.

The series consist of a reference voltage source, delay circuit, comparator and output driver.  The watchdog timeout period & release delay period is internally set so it is possible to implement a highly-integrated system monitor without needing additional external components.

By making use of the newly added EN/ENB pin the watchdog function can be turned OFF allowing the series to be used as a simple voltage detector. With the XD6122/XD6124 series, since the EN/ENB pin is internally pulled up to VIN or pulled down to VSS, it is possible to use the watchdog function even when the pin is OPEN.

The detect voltages are internally fixed between 1.6V ~ 5.0V in increments of 100mV, using laser trimming technology. Six watchdog timeout period settings are available; 1.6s, 800ms, 400ms, 200ms, 100ms & 50ms. Five release delay times are available; 400ms, 200ms, 100ms, 50ms & 3.13ms.


  • Standard Detect Voltages: 1.6V, 2.2V, 2.3V, 2.4V, 2.9V, 3.0V, 3.1V, 4.4V, 4.5V or 4.6V
  • Operating Voltage Range: 1.0V~6.0V
  • Hysteresis Range: VDFL x 5% (Typ)
  • Output Configuration: N-Channel Open Drain, CMOS
  • SOT-25 & USP-6C Packages