3-Pin UC Supervisor CircuitThe FM1233A is a supervisor circuit that monitors a micropro-
cessor power supply or other system voltage and issues a reset
pulse when a fault condition exists. Several different threshold
voltages are offered to accommodate 3.3V and 3.0V systems
with different tolerances.
FM1233A features a precision temperature-compensated volt-
age reference and Comparator When VCC falls to the threshold
voltage, a RESET pulse is issued, holding the output in the
active state. When power rises above VTH, the reset remains
asserted for a minimum period (tRST) to allow the system Clock
and other circuits to stabilize. The reset output of FM1233A is of
open-drain active low type.
The FM1233A also CAN monitor a Switch closure on its output,
enabling it to recognize an external reset from a pushbutton
Switch or a P. In the case of a Switch the closure will be
debounced by circuitry internal to the FM1233A. By Fairchild Semiconductor
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FM1233A Pb-Free | FM1233A Cross Reference | FM1233A Schematic | FM1233A Distributor |
FM1233A Application Notes | FM1233A RoHS | FM1233A Circuits | FM1233A footprint |