FM809 Fairchild Semiconductor, FM809 Datasheet - Page 4

• Manufacturer Part Number: FM809
• Description: 3-Pin C Supervisor Circuits
• Manufacturer: Fairchild Semiconductor

FM809/810 Rev. F
Pin Descriptions
* with overbar, FM809 (RESET); without, FM810 (RESET).
Circuit Timing
When operating properly with 5V in (for example), V
be about 5V. When V
shown. When V
("issues a RESET") and stays there unless V
its minimum operating voltage, approx. 1V. At this point, the
supervisor loses control, and its output may rise, only to again
follow V
Pin Number
IN
down to the ground.
1
2
3
IN
drops below V
IN
(e.g.: FM809)
starts to fall, V
GND
GND
V
V
5V
1V
5V
1V
TH
TH
TH
, V
OUT
OUT
RESET*
Name
will follow it down as
GND
V
CC
IN
drops to ground
also falls below
OUT
OUTPUT
will also
INPUT
GROUND
RESET (RESET) remains LOW (HIGH) while V
and for at least 140ms after V
4
When V
reached, whereupon the device regains control, V
to ground, etc. When V
RESET 140 ms later.
If it is required that a lower value than GND + 1.0V is needed
on RESET signal during V
on the device output (to GND for the FM809, to V
FM810).
IN
begins to rise, V
140ms
Function
CC
IN
rises above V
CC
rises above V
OUT
≤ 1V, a 100K resistor may be used
follows it until 1.0V or so is
TH
TH
.
CC
, V
is below V
OUT
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comes out of
OUT
CC
is pulled
TH
for the
,