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FMFFM1233AC Datasheet(PDF) 5 Page - Fairchild Semiconductor

No. de pieza FMFFM1233AC
Descripción Electrónicos  3-Pin uC Supervisor Circuit
Download  7 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FMFFM1233AC Datasheet(HTML) 5 Page - Fairchild Semiconductor

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FM1233A Rev. E
General Description
The FM1233A features a highly accurate voltage reference to
which VCC is compared. Once VCC is below the specified thresh-
old, it will drive the RESET line and continue to hold it low until
VCC returns above the threshold and the time for the RESET
pulse duration has expired. The FM1233A is immune to short
negative going transients on the VCC line. The placement of a
0.1µF bypass capacitor as close as possible to the VCC pin pro-
vides additional transient immunity.
For a VCC value below 1.0V, the FM1233A does not sink very
much current on the RESET pin. This is not a problem in most
systems since common devices are not functional in this range.
If it is desired for the FM1233A reset to be functional below this
range, use a 100K
Ω pull-down resistor between RESET and
VSS.
Bi-Directional Reset
The FM1233A permits a pushbutton (or a signal) to initiate a
reset externally. Once this external reset is detected on the
reset pin, FM1233 also actively asserts the reset signal to main-
tain the Reset Timeout period when the external reset is not
present .
FM1233 internally debounces glitches seen during a typical
push button closure. For proper operation, the external switch
should be paralleled by an external capacitor of 100pF to
0.01µF.
Connecting an External Reset to the FM1233A
1
FM1233
Controller
2
3
VCC
GND
100pF
PUSH
BUTTON
RESET


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