REJ03D0775-0400 Rev.4.00 Sep 18, 2007

Page 1 of 7

M51951A,B/M51952A,B

Voltage Detecting, System Resetting IC Series

REJ03D0775-0400

Rev.4.00

Sep 18, 2007

Description

M51951A,B/M51952A,B are semiconductor integrated circuits designed for detecting supply voltage and resetting all

types of logic circuits such as CPUs.

They include a built-in delay circuit to provide a retardation time (200

µs Typ).

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

circuit.

Features

• Few external parts

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

• 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

Package: PLZZ0004CB-A (SOT-89)

M51951AML/BML

M51952AML/BML

2

Output

(Top view)

Package: PRSS0003DF-A (TO-92L)

M51951ASL/BSL

M51952ASL/BSL

12

(Top view)

3

1

GND

Supply voltage

3

1. Supply voltage

2. GND

3. Output

Package: 5P5T

(Top view)

M51951AL/BL

M51952AL/BL

Output

GND

Supply voltage

5

1

2

3

4

NC

NC