R5105N Series [For automotive applications]

Microprocessor Supervisory Circuit

Data Sheet / Flyer
Data Sheet * Flyer

The R5105N Series are CMOS-based microprocessor supervisory circuit, or high accuracy and ultra low supply current voltage detector with built-in delay circuit and watchdog timer. When the supply voltage is down across the threshold, or the watchdog timer does not detect the system clock from the microprocessor, the reset output is generated.

The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the accuracy is ±1.0%. The released delay time (Power-on Reset Delay) circuit is built-in, and output delay time is adjustable with an external capacitor, and the accuracy is ±16%*. When the supply voltage becomes higher than the released voltage, the reset state will be maintained during the delay time. The output type of the reset is selectable, Nch open-drain, or CMOS.

The time out period of the watchdog timer can be also set with an external capacitor, and the accuracy is ±33%*.

There are another 4 products by the difference of packages and the function of voltage detector and watchdog timer. The package of R5105N is SOT-23-6.

  • *) Accuracy to center value of (Min.+Max.)/2
Supply Current Typ. 11μA
Operating Voltage Range 0.9V to 6.0V
< Voltage Detector Part >  
Detector Threshold Range 1.5V to 5.5V (0.1V steps)
Detector Threshold Accuracy ±1.0%
Power-on Reset Delay Time accuracy ±16%* (-40°C <= Topt <= 105°C)
Power-on reset delay time of the voltage detector Typ. 370ms with an external capacitor : 0.1μF
< Watchdog Timer Part >  
Built-in a watchdog timer's time out period accuracy ±33%* (-40°C <= Topt <= 105°C)
Timeout period for watchdog timer Typ. 310ms with an external capacitor : 0.1μF
Reset timer for watchdog timer Typ. 34ms with an external capacitor : 0.1μF
Package SOT-23-6
  • *) Accuracy to center value of (Min.+Max.)/2
  • Supervisory circuit for equipment with using microprocessors.
Data Sheet Flyer Package Info. Mark Info. Quality Assurance Data
R5105N Series R5105N Series SOT-23-6 R5105N Reliability

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