M51957A,B/M51958A,B
Voltage Detecting, System Resetting IC Series
REJ03D0778-0200
Rev.2.00
Aug 20, 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 R
L
= 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
5 Output
4 Delay capacitor
3 GND
NC 3
2 Input
1 Power-supply
(Top view)
Outline: 5P5T
GND 4
(Top view)
NC: No Connection
Outline: PRSP0008DE-C (recommend)
PRSP0008DA-A (8P2S-A) (not recommend for new design)
5 Delay capacitor
6 Output
NC 1
Input 2
M51957AFP/BFP
M51958AFP/BFP
8 NC
7 Power-supply
REJ03D0778-0200 Rev.2.00 Aug 20, 2007
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