ME7044A Datasheet, PDF (4/7 Pages) List of Unclassifed Manufacturers – Voltage Detector

Rev 0.0.1. SEP. 2003
ME70XXA Voltage Detector
Functional Description
The ME70XXA series is a set of voltage detectors
equipped with a high stability voltage reference which
is connected to the negative input of a
comparator―denoted as VREF in the following figure
for NMOS output voltage detector.
When the voltage drop to the positive input of the
comparator (i,e,VB) is higher than VREF, VOUT goes
high, and VB is expressed as VBH=VDD×RB / (RA
+RB). If VDD is decreased so that VB falls to a value
less than VREF, the comparator output inverts from
high to low, VOUT goes low, VC is high. If VDD falls
below the minimum operating voltage, the output
becomes undefined.
The figure demonstrates the NMOS output type with
positive output polarity (VOUT is normally open, active
low).
Application circuits shown are examples of positive
output polarity (normally open, active low) unless
otherwise specified.
Application Circuits
Microcomputer Reset Circuit
Normally a reset circuit is required to protect the
microcomputer system from malfunctions due to power
fail . The following examples show how different output
configurations perform a reset function in various
systems.
NMOS open drain output application for
separate power supply
NMOS open drain output application with R-C
delay
NMOS Output Voltage Detector (ME70XXA)
Shanghai Union Microsystems, Inc
www.union-ic.com