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Fairchild Semiconductor - 3-Pin C Supervisor Circuit

Numéro de référence FM1233D
Description 3-Pin C Supervisor Circuit
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FM1233D fiche technique
February 2003
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 5kpull-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
VCC
GND
Connection Diagram
3
FM1233D
12
RESET
Controller
GND 1
FM1233D 3 VCC
RESET 2
SOT23-3 Package
©2002 Fairchild Semiconductor Corporation
FM1233D Rev. D
1
www.fairchildsemi.com

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