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Renesas Electronics Components Datasheet

M51957B Datasheet

System Resetting IC

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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 k
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
Page 1 of 13


Renesas Electronics Components Datasheet

M51957B Datasheet

System Resetting IC

No Preview Available !

M51957A,B/M51958A,B
Block Diagram
M51957A, B
Power-
supply
A: Built-in Load
B: Open Collector
Input
+
1.25V
5µA
Typ
25µA
Typ
Output
Input
M51958A, B
Power-
supply
A: Built-in Load
B: Open Collector
+
1.25V
5µA
Typ
25µA
Typ
+
Output
GND Delay capacitor
Operating Waveform
M51957A, B
1.25V
t
H
td td
L
td 0.34 × Cd(pF) µs
t
GND Delay capacitor
1.25V
H
L
M51958A, B
t
td td
td 0.34 × Cd(pF) µs
t
REJ03D0778-0300 Rev.3.00 Sep 18, 2007
Page 2 of 13


Part Number M51957B
Description System Resetting IC
Maker Renesas
Total Page 14 Pages
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