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參數(shù)資料
| 型號(hào)： | SN54AHCT123AFKR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 諧振器 |
| 英文描述： | AHCT/VHCT SERIES, DUAL MONOSTABLE MULTIVIBRATOR, CQCC20 |
| 封裝： | CERAMIC, CC-20 |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大?。?/td> | 163K |
| 代理商： | SN54AHCT123AFKR |
SN54AHCT123A, SN74AHCT123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS420C – JUNE 1998 – REVISED DECEMBER 1999
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
retriggering data
The minimum input retriggering time (tMIR) is the minimum time required after the initial signal before retriggering the
input. After tMIR, the device retriggers the output. Experimentally, it also can be shown that to retrigger the output
pulse, the two adjacent input signals should be tMIR apart, where tMIR = 0.30 × tw. The retrigger pulse duration is
calculated as shown in Figure 3.
tMIR
tRT
tPLH
tw
Input
Output
tRT = tw + tPLH = (K × RT × CT) + tPLH
Where:
tMIR = Minimum Input Retriggering Time
tPLH = Propagation Delay
tRT = Retrigger Time
tw
= Output Pulse Duration Before Retriggering
Figure 3. Retrigger Pulse Duration
The minimum value from the end of the input pulse to the beginning of the retriggered output should be approximately
15 ns to ensure a retriggered output. This is illustrated in Figure 4.
Input
Output
tMRT = Minimum Time Between the End of the Second Input Pulse and the Beginning of the Retriggered Output
tMRT = 15 ns
tMRT
Figure 4. Input/Output Requirements
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