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FM803MS3X Datasheet(PDF) 4 Page - Fairchild Semiconductor

Part # FM803MS3X
Description  3-Pin 關C Supervisor Device
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FM803MS3X Datasheet(HTML) 4 Page - Fairchild Semiconductor

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FM803 Rev. C.3
Pin Descriptions
Pin Number
Name
Function
1
GND
GROUND
2
/RESET
/RESET remains LOW while VCC is below
V
TH, and for at least 140ms after VCC rises
above V
TH.
3VCC
Circuit Timing (Ex: FM803)
When operating properly with 5V VCC (for example), /RESET will
also be about 5V. When V
CC starts to fall, /RESET will follow it
down as shown. When V
CC 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 V
CC 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.
3.3V
VTH
1V
GND
3.3V
VTH
1V
GND
VCC
RESET
140ms
(min)


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