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FM1233DDS3X Folha de dados(PDF) 1 Page - Fairchild Semiconductor |
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FM1233DDS3X Folha de dados(HTML) 1 Page - Fairchild Semiconductor |
1 / 7 page ©2002 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com February 2003 FM1233D Rev. D FM1233D 3-Pin µC Supervisor Circuit General Description The FM1233D 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 5V systems with different tolerances. The device 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 for approximately 250 ms to allow the system clock and other cir- cuits to stabilize. The reset output of FM1233D is of open-drain active low type. Features s Precision monitoring of 5V and lower voltage microprocessor systems s VTH values of 4.62V, 4.38V and 4.12V s Automatic restart of microprocessor after power failure s 140ms (min) power-on RESET delay (typ.: 256ms) s Internal 5k Ω pull-up resistor s Other reset choices available: 32 to 128ms s Operating Temperature -40°C to +105°C s SOT23-3 package Typical Operating Circuit Connection Diagram SOT23-3 Package 1 FM1233D Controller 2 3 VCC GND RESET GND VCC RESET 1 FM1233D 2 3 |
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