R5108 Series
Watchdog Timer Equipped with SENSE Pin with VD

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  • Description

    The R5108 Series are CMOS-based system power ICs with a voltage detector (VD) and watchdog timer (WDT) integrated in a single chip.

    R5108 monitors the power system of devices equipped with microprocessors and prevents system runaway with a reset signal when a malfunction occurs. R5108 is equipped with the function that inhibits clock monitoring of the WDT (INH). Since R5108 has a SENSE pin for monitoring voltage separately from the power pin, its reset signal does not become unstable under the condition that the power supply is sufficient to operate the IC, and the "L" can be maintained.

  • Spec
    Consumer Industrial Automotive
    Input Voltage Range 1.5 V to 6.0 V (7.0 V)
    Operating Temperature Range -40°C to 105°C (125°C) -40°C to 125°C (150°C) -40°C to 125°C (150°C)
    -40°C to 105°C (150°C)
    Supply Current Typ. 11 µA
    Timeout Period Typ. 310 ms (CTW = 0.1 µF)
    Timeout Period Accuracy ±33%
    Reset Time Typ. 34 ms (CTW = 0.1 µF)
    Package SSOP-8G
    VD Detector Threshold Range 1.5 V to 5.5 V (0.1 V step)
    VD Detector Threshold Accuracy ±1.0%
    VD Detector Threshold Temperature Coefficient Typ. ±100 ppm/°C
    VD Release Output Delay Time Typ. 370 ms (CD = 0.1 µF)
    VD Release Delay Time Accuracy ±16% ±18% ±18% (−40°C ≤ Ta ≤ 125°C)
    ±16% (−40°C ≤ Ta ≤ 105°C)
  • Technical
    • Typical Application

      Typical Application

    • Timing Chart

      Timing Chart

      * VTCD : Threshold voltage of CD pin when a power-on reset pulse inverting.
      * Vref2H : CTW pin voltage at the end of WDT timeout period.
      * Vref2L : CTW pin voltage at the begin of WDT timeout period.
      * tPHL : Output delay time
      * tWDI : tWD/10 (SCK pulses input during this period are ignored.)

  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

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Functional Description

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Category:Watchdog Timers

Features +VD,SENSE pin
min (V)
max (V)