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ASM708CSA Datasheet(PDF) 6 Page - Alliance Semiconductor Corporation

Part # ASM708CSA
Description  Low Power uP Supervisor Circuits
Download  16 Pages
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Manufacturer  ALSC [Alliance Semiconductor Corporation]
Direct Link  https://www.alliancememory.com
Logo ALSC - Alliance Semiconductor Corporation

ASM708CSA Datasheet(HTML) 6 Page - Alliance Semiconductor Corporation

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Notice: The information in this document is subject to change without notice
Low Power µP Supervisor Circuits
ASM705 / 706 / 707 / 708
ASM813L
rev 1.5
February 2005
Monitoring a Negative Voltage
The Power-Fail circuitry can also monitor a negative supply
rail. When the negative rail is OK, PFO will be LOW, and
when the negative rail is failing (not negative enough), PFO
goes HIGH (the opposite of when positive voltages are
monitored). To trigger a reset, these outputs need to be
inverted: adding the resistors and transistor as shown
achieves this. The RESET output will then have the same
sense as for positive voltages: good = HIGH, bad = LOW. It
should be noted that this circuit’s accuracy depends on the
VCC line, the PFI threshold tolerance, and the resistors.
VCC
PFI
MR
PFO
VCC
R1
R2
ASM70x
RESET
GND
To
µP
Figure 5: Monitoring a negative voltage
2N3904
R3
R4
VCC - 1.25
R1
=
1.25 - VTRIP
R2
Negative Input Voltage
+


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