Aporc03 is a Power-on-Reset circuit. Reset signals are generated on both the rising and falling
edge of the supply voltage. During power-on, POR output follows the supply voltage as long as it
is below the threshold voltage. When the threshold voltage is reached, the POR signal turns low.
A delay of a few microseconds is provided to allow the supply voltage to stabilize. During power-
off, the POR output turns high at reaching the threshold voltage without any delay. An inverted
PORB signal is also provided