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FM1233D Datasheet

  • FM1233D

  • 3-Pin レC Supervisor Circuit

  • 34.34KB

  • 7頁

  • FAIRCHILD

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FM1233D 3-Pin 碌C Supervisor Circuit
February 2003
FM1233D
3-Pin 碌C 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 V
CC
falls to the threshold
voltage, a RESET pulse is issued, holding the output in the
active state. When power rises above V
TH
, 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
V
TH
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
鈩?/div>
pull-up resistor
s
Other reset choices available: 32 to 128ms
s
Operating Temperature -40擄C to +105擄C
s
SOT23-3 package
Typical Operating Circuit
VCC
3
FM1233D
Controller
1
GND
2
RESET
Connection Diagram
GND
1
FM1233D
3
VCC
RESET
2
SOT23-3 Package
漏2002 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FM1233D Rev. D

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