FM1233ACS(2001) View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
FM1233ACS Datasheet PDF : 7 Pages
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Pin Descriptions
Pin Number
1
2
Name
GND
/RESET
3
VCC
Circuit Timing (Ex: FM1233A)
Function
GROUND
/RESET remains LOW while VCC is below
VTH, and for at least 140ms after VCC rises
above VTH.
VCC
3.3V
VTH
1V
GND
3.3V
VTH
RESET
1V
GND
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.
140ms
(min)
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.
FM1233A Rev. B
4
www.fairchildsemi.com
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