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FM1233A - 3-Pin C Supervisor Circuit

General Description

The FM1233A is a supervisor circuit that monitors a microprocessor 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.

Key Features

  • a precision temperature-compensated voltage 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 pushbutto.

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Other Datasheets by Fairchild (now onsemi)

Part Number Description
FM1233B 3-Pin C Supervisor Circuit
FM1233D 3-Pin C Supervisor Circuit
FM1233E 3-Pin C Supervisor Circuit

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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FM1233A 3-Pin µC Supervisor Circuit September 2004 FM1233A 3-Pin µC Supervisor Circuit General Description The FM1233A is a supervisor circuit that monitors a microprocessor 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 voltage 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.