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M51957A

VOLTAGE DETECTING/ SYSTEM RESETTING IC SERIES

Renesas Electronics 

M51957A,B/M51958A,B

Voltage Detecting, System Resetting IC Series

REJ03D0778-0300

Rev.3.00

Sep 18, 2007

Description

M51957A,B/M51958A,B are semiconductor integrated circuits for resetting of all types of logic circuits such as CPUs,

and has the feature of setting the detection voltage by adding external resistance.

They include a built-in delay circuit to provide the desired retardation time simply by adding an external capacitor.

They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping

circuit.

Features

• Few external parts

• Large delay time with a capacitor of small capacitance (td ≈ 100 ms, at 0.33 µF) (M51957, M51958)

• Low threshold operating voltage (Supply voltage to keep low-state at low supply voltage):

0.6 V (Typ) at RL = 22 kΩ

• Wide supply voltage range: 2 V to 17 V

• Wide application range

Application

• Reset circuit of Pch, Nch, CMOS, microcomputer, CPU and MCU, Reset of logic circuit, Battery check circuit,

switching circuit back-up voltage, level detecting circuit, waveform shaping circuit, delay waveform generating

circuit, DC/DC converter, over voltage protection circuit

Recommended Operating Condition

• Supply voltage range: 2 V to 17 V

Pin Arrangement

M51957AL/BL

M51958AL/BL

M51957AFP/BFP

M51958AFP/BFP

5 Output

4 Delay capacitor

3 GND

2 Input

1 Power-supply

(Top view)

Outline: 5P5T

NC 1

8 NC

Input 2

7 Power-supply

NC 3

6 Output

GND 4

5 Delay capacitor

(Top view)

NC: No Connection

Outline: PRSP0008DE-C (recommend)

PRSP0008DA-A (8P2S-A) (not recommend for new design)

REJ03D0778-0300 Rev.3.00 Sep 18, 2007

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