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FM1233ADS3X Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FM1233ADS3X Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 7 page ©2004 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com September 2004 FM1233A Rev. E FM1233A 3-Pin µC Supervisor Circuit General Description The 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 µP. In the case of a switch, the closure will be debounced by circuitry internal to the FM1233A. Features ■ Precision monitoring of 3.3V and lower voltage microprocessor systems ■ VTH values of 3.08V, 2.88V and 2.72V ■ Automatic restart of microprocessor after power failure ■ Reset Timeout Period Choice: – Options AC and AD: 140ms (min)/256ms (typ) – Option ABA: 17ms (min)/32ms (typ) – Available on request: 64ms (typ) and 128ms (typ) ■ Internal 5kΩ pull-up resistor ■ Operating Temperature -40°C to +105°C ■ Monitors external pushbutton override ■ Internal switch debounce circuitry ■ SOT23-3 package Typical Operating Circuit Connection Diagram SOT23-3 Package 1 FM1233A Controller 2 3 VCC GND RESET GND VCC RESET 1 FM1233A 2 3 |
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