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© Semiconductor Components Industries, LLC, 2011
August, 2011 − Rev. 1
1 Publication Order Number:
AND8426/D
AND8426/D
Programming the
Hysteresis Voltage Of
Universal Voltage Monitors
MC34161, MC33161 and
NCV33161
Prepared by: Cimiy Chan
ON Semiconductor
Device Application Input Voltage Output Power Topology I/O Isolation
MC34161
MC33161
NCV33161
Universal Voltage Monitor N/A N/A N/A N/A
Circuit Description
Figure 1. General Block Diagram of MC34161/MC33161
The Figure 1 shows the basic block diagram of MC34161/MC33161. It can be used for wide variety of voltage sensing
application. They offer the circuit designer an economical solution for positive and negative voltage detection. The circuit
consists of two comparators with hysteresis, a unique mode select input for channel programming, a output of 2.54 V reference,
and two open collector outputs capable of sinking in excess of 10 mA.
Most of the comparators for the voltage monitoring provide hysteresis which is used for reducing the sensitivity to noise or
a slowly moving input (low slew rate) signal. From the information of MC34161/MC33161 datasheet, the hysteresis is fixed
to around 25 mV typically. However, this hysteresis value may not be enough for some applications for reducing the sensitivity
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APPLICATION NOTE
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