M51943A,B/M51944A,B
Voltage Detecting, System Resetting IC Series
REJ03D0773-0400
Rev.4.00
Sep 18, 2007
Description
M51943A,B/M51944A,B are semiconductor integrated circuits designed for detecting supply voltage and resetting all
types of logic circuits such as CPUs.
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):
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
M51943AL/BL
M51944AL/BL
M51943AML/BML
M51944AML/BML
5 Output
M51943ASL/BSL
M51944ASL/BSL
3 Output
4 NC
2 GND
3 GND
1 Supply voltage
2 NC
(Top view)
1 Supply voltage
Package: PLZZ0004CB-A (SOT-89)
(Top view)
Package: 5P5T
1. Supply voltage
2. GND
3. Output
1
2
3
(Top view)
Package: PRSS0003DF-A (TO-92L)
REJ03D0773-0400 Rev.4.00 Sep 18, 2007
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