FM1233D 데이터 시트보기 (PDF) - Fairchild Semiconductor
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FM1233D Datasheet PDF : 7 Pages
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Pin Descriptions
Pin Number
1
2
Name
GND
RESET
3
VCC
Circuit Timing (Ex: FM1233D)
5V
VTH
Function
GROUND
RESET remains LOW while VCC is below VTH, and
for at least 140ms after VCC rises above VTH.
VCC
1V
GND
5V
VTH
RESET
1V
GND
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.
140ms
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.
FM1233D Rev. D
4
www.fairchildsemi.com
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