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R5101 Series

System Power Supply with Watchdog Timer

  • Consumer
  • RoHS

The R5101 Series are CMOS-based system power ICs with a voltage regulator (VR) featuring 50mA output, a voltage detector (VD) and a watchdog timer (WDT) integrated in a single chip. R5101 monitors the power system of devices equipped with microprocessors and prevents system runaway with a reset signal when a malfunction occurs. The output delay time of the VD and watchdog timeout period/reset time can be adjusted by an external capacitor with a high degree of accuracy. The R5101 is equipped with the function that inhibits clock monitoring of the WDT (CE).

Specs & Datasheets

Input Voltage Range 1.5 V to 10.0 V (12.0 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 5 µA
Timeout Period Typ. 120 ms
Package SSOP-8G
VD Detector Threshold Range 1.7 V to 4.5 V (0.1 V step)
VD Detector Threshold Accuracy ±2.5%
VD Release Output Delay Time Min. 7 ms, Typ. 14 ms, Max. 35 ms (CD = 0.001 µF)
LDO Output Voltage Range 1.8 V to 5.0 V (0.1V step)
LDO Output Voltage Accuracy ±2.5%
LDO Output Current Limit 50 mA

Download Datasheet

Technical Documents

Typical Application

Typical Application

Timing Chart

Timing Chart

* Vref2H : CTW pin voltage at the end of WDT timeout period.
* Vref2L : CTW pin voltage at the begin of WDT timeout period.
* TSCKW : SCK input pulse width

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
SSOP-8G R5101G R5101G-FE

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

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