REJ03D0912-0402 Rev.4.02

Page 1 of 13

Apr 01, 2010

RNA51957A, B

Voltage Detecting, System Resetting IC Series

Description

RNA51957A,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 F)

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

0.6 V (Typ) at RL = 22 k



 Wide supply voltage range: 2 V to 17 V

 Wide application range

 Ordering Information

Part Name

Package Type

Package Code

Package

Abbreviation

Taping Abbreviation

(Quantity)

Surface

Treatment

RNA51957AFPH0

SOP-8 pin

PRSP0008DE-C

FP

H (2,500 pcs / Reel)

0 (Ni/Pd/Au)

RNA51957APT0

DIP-8 pin

PRDP0008AF-B

P

T (1,000 pcs / Reel)

0 (Ni/Pd/Au)

RNA51957BFPH0

SOP-8 pin

PRSP0008DE-C

FP

H (2,500 pcs / Reel)

0 (Ni/Pd/Au)

RNA51957BPT0

DIP-8 pin

PRDP0008AF-B

P

T (1,000 pcs / Reel)

0 (Ni/Pd/Au)

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

REJ03D0912-0402

Rev.4.02

Apr 01, 2010