FM1233ECS3X 查看數據表（PDF） - Fairchild Semiconductor
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FM1233ECS3X Datasheet PDF : 7 Pages
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February 2003
FM1233E
3-Pin µC Supervisor Circuit
General Description
The FM1233E 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 3V 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 FM1233E is of open-drain
active low type.
Features
s Precision monitoring of 3.3V and lower voltage
microprocessor systems
s VTH values of 2.88V, 2.72V
s Automatic restart of microprocessor after power failure
s 140ms (min) power-on RESET delay (typ.: 256ms)
s Internal 5kΩ 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
VCC
GND
Connection Diagram
3
FM1233E
1
2
RESET
Controller
GND 1
FM1233E 3 VCC
RESET 2
SOT23-3 Package
©2003 Fairchild Semiconductor Corporation
1
FM1233E Rev. D
www.fairchildsemi.com
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