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FM1233ACS3X View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
Manufacturer
FM1233ACS3X
Fairchild
Fairchild Semiconductor Fairchild
FM1233ACS3X Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
Pin Descriptions
Pin Number
1
2
3
Name
GND
RESET
VCC
Circuit Timing (Ex: FM1233A)
3.3V
VTH
Function
GROUND
RESET remains LOW while VCC is below VTH, and for at least
the minimum Reset Timeout period after VCC rises above VTH.
VCC
1V
GND
3.3V
VTH
RESET
1V
GND
140ms
(min)
When operating properly with 3V VCC (for example), RESET will
also be about 3V. 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 after the minimum Reset Timeout period.
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.
FM1233A Rev. E
4
www.fairchildsemi.com
 

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