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參數(shù)資料
| 型號： | M74HC123A |
| 廠商： | 意法半導體 |
| 英文描述： | Dual Retriggerable Monostable Multivibrator(可再觸發(fā)單穩(wěn)態(tài)多諧振蕩器) |
| 中文描述： | 雙Retriggerable單穩(wěn)態(tài)觸發(fā)器（可再觸發(fā)單穩(wěn)態(tài)多諧振蕩器） |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 291K |
| 代理商： | M74HC123A |
FUNCTIONAL DESCRIPTION (continued)
RE-TRIGGERED OPERATION
When a second trigger pulse follows the first its ef-
fect will depend on the state of the multivibrator. If
the capacitor Cx is being charged the voltagelevel
of R/C external falls to Vrefl again and Q remains
high i.e. the retrigger pulse arrives in a time shorter
than the period Rx
Cx seconds, the capacitor
charging time constant. If the second trigger pulse
is very closeto the initialtrigger pulse itisineffective
; i.e. thesecond triggermust arrive in the capacitor
discharge cycle to be ineffective; Hence the mini-
mum time for a second trigger to be effective de-
pendson V
CC
and Cx.
RESETOPERATION
CL isnormallyhigh. If CLislow,thetriggeris not ef-
fective because Q output goes low and trigger con-
trol flip-flop is reset.
Also transistor Op is turned on and Cx is charged
quickyto V
CC
. This means if CL input goes low, the
IC becomes waiting state both inoperating and non
operating state.
TRUTH TABLE
INPUTS
B
H
L
X
OUTPUTS
NOTE
A
CL
H
H
H
H
Q
Q
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
OUTPUT ENABLE
INHIBIT
X
H
L
L
X
L
L
H
H
H
X
L
L
H
X:Don’tCare Z: High Impedance
INPUT AND OUTPUT EQUIVALENT CIRCUIT
M54/M74HC123/123A
4/14
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