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參數資料
| 型號： | FMFFM1233AC |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 3-Pin ?C Supervisor Circuit |
| 中文描述： | 3引腳？?監電路 |
| 文件頁數： | 5/7頁 |
| 文件大小： | 66K |
| 代理商： | FMFFM1233AC |
F
5
www.fairchildsemi.com
FM1233A Rev. E
General Description
The FM1233A features a highly accurate voltage reference to
which V
CC
is compared. Once V
CC
old, it will drive the RESET line and continue to hold it low until
V
CC
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 V
0.1μF bypass capacitor as close as possible to the V
vides additional transient immunity.
is below the specified thresh-
CC
line. The placement of a
CC
pin pro-
For a V
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
pull-down resistor between RESET and
V
SS
.
Bi-Directional Reset
CC
value below 1.0V, the FM1233A does not sink very
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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