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FM809MS3X Datasheet(PDF) 4 Page - Fairchild Semiconductor

Part # FM809MS3X
Description  3-Pin UC Supervisor Circuits
Download  9 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FM809MS3X Datasheet(HTML) 4 Page - Fairchild Semiconductor

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FM809/810 Rev. G
Pin Descriptions
* with overbar, FM809 (RESET); without, FM810 (RESET).
Circuit Timing (e.g.: FM809)
When operating properly with 5V in (for example), VOUT will also
be about 5V. When VIN starts to fall, VOUT will follow it down as
shown. When VIN drops below VTH, VOUT drops to ground
("issues a RESET") and stays there unless VIN 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 VIN down to the ground.
When VIN begins to rise, VOUT follows it until 1.0V or so is
reached, whereupon the device regains control, VOUT is pulled
to ground, etc. When VIN rises above VTH, VOUT 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 for the FM809, to VCC for the
FM810).
Pin Number
Name
Function
1
GND
GROUND
2
RESET*
RESET (RESET) remains LOW (HIGH) while VCC is below VTH,
and for at least 140ms after VCC rises above VTH.
3VCC
5V
VTH
1V
GND
5V
VTH
1V
GND
INPUT
OUTPUT
140ms


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