FM1233D datasheet(4/7 Pages) FAIRCHILD

tên linh kiện	FM1233D

Giải thích chi tiết về linh kiện	3-Pin 關C Supervisor Circuit

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FM1233D Rev. D

Pin Descriptions

Circuit Timing (Ex: FM1233D)

When operating properly with 5V VCC (for example), RESET will

also be about 5V. When VCC starts to fall, RESET will follow it

down as shown. When VCC drops below VTH, RESET drops to

ground ("issues a RESET") and stays there unless VCC also

falls below its minimum operating voltage, approx. 1V. At this

point, the supervisor loses control, and its output may rise, only

to again follow VCC down to the ground.

When VCC begins to rise, RESET follows it until 1.0V or so is

reached, whereupon the device regains control, RESET is

pulled to ground, etc. When VCC rises above VTH, RESET

comes out of RESET 140 ms later.

If it is required that a lower value than GND + 1.0V is needed

on RESET signal during VCC ≤ 1V, a 100K resistor may be used

on the device output to GND.

Pin Number

Name

Function

1

GND

GROUND

2

RESET

RESET remains LOW while VCC is below VTH, and

for at least 140ms after VCC rises above VTH.

3VCC

5V

VTH

1V

GND

5V

VTH

1V

GND

VCC

RESET

140ms

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