Texas Instruments LM8365, User Manual, Page: 4 / 18

SNVU493 – October 2015
Applications
For the following operation examples, we will use an LM8365 with a typical voltage threshold of 2.7 V.
1 RST Response to VIN Undervoltage
In a typical application, the RESET output can order a microprocessor to enter reset when VCC drops
below its minimum operating voltage. Jumpers J1, J2, and J3 are left unpopulated resulting in the
minimum programmed output delay. As shown in
Figure 1 , the RST voltage follows VIN as long as the
VIN voltage is above the RESET threshold. When VIN falls below this threshold, the RESET pin outputs
low. When VIN rises above the threshold, the RST voltage is pulled back up to VIN, corresponding to the
RESET pin outputting high. The LM8365 provides proper voltage supervision in critical situations like
undervoltage input to a microprocessor.
Figure 1. RST Response to Low VIN
4 Applications SNVU493 – October 2015
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