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FM1233A(2001) View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
Manufacturer
FM1233A
(Rev.:2001)
Fairchild
Fairchild Semiconductor Fairchild
FM1233A Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
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 provides 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 100KΩ pull-down resistor between /RESET and VSS.
Bi-Directional Reset
The FM1233A 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 FM1233A
VCC
3
FM1233
Controller
GND
1
2
/RESET
PUSH
BUTTON
100pF
FM1233A Rev. B
5
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