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参数资料
| 型号： | M54HC423 |
| 厂商： | 意法半导体 |
| 英文描述： | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| 中文描述： | 双RETRIGGERABLE单稳态触发器 |
| 文件页数： | 4/14页 |
| 文件大小： | 290K |
| 代理商： | M54HC423 |
FUNCTIONAL DESCRIPTION (continued)
RE-TRIGGERED OPERATION
When a second trigger pulse follows the first its
effect will depend onthestate 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
minimum time for a second trigger to be effective
depends on V
CC
and Cx.
RESETOPERATION
CL is normally high. If CL is low, the trigger is not
effective because Q output goes low and trigger
control 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
L
Q
Q
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
INHIBIT
X
H
L
X
L
L
H
H
X
L
H
X:Don’tCare Z: High Impedance
INPUT AND OUTPUT EQUIVALENT CIRCUIT
M54/M74HC423/423A
4/14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M54HC423A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| M54HC423AB1R | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| M54HC423AC1R | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| M54HC423AF1R | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| M54HC423AM1R | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
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