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FM1233BDS3X Datenblatt(PDF) 4 Page - Fairchild Semiconductor

Teilenummer FM1233BDS3X
Bauteilbeschribung  3-Pin 關C Supervisor Circuit
Download  6 Pages
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FM1233BDS3X Datenblatt(HTML) 4 Page - Fairchild Semiconductor

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FM1233B Rev. D
General Description
The FM1233B features a highly accurate voltage reference to
which VCC is compared. Once VCC is below the specified
threshold, 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 FM1233B 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
provides additional transient immunity.
For a VCC value below 1.0V, the FM1233B 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 FM1233B reset to be functional below this
range, use a 100K
Ω pull-down resistor between RESET and
VSS.
Bi-Directional Reset
The FM1233B permits an external pushbutton to initiate a reset.
Such a connection to pin 2 will be debounced, RESET will go
low and recover in typically 250ms. For proper operation, the
external switch should be paralleled by an external capacitor of
100pF to 0.01µF.
Connecting an External Reset to the FM1233B
1
FM1233
Controller
2
3
VCC
GND
100pF
PUSH
BUTTON
RESET


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