參數(shù)資料
型號: SN74AHCT123APWLE
廠商: TEXAS INSTRUMENTS INC
元件分類: 諧振器
英文描述: AHCT/VHCT SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16
封裝: PLASTIC, TSSOP-16
文件頁數(shù): 16/16頁
文件大?。?/td> 216K
代理商: SN74AHCT123APWLE
SN54AHCT123A, SN74AHCT123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS420E – JUNE 1998 – REVISED AUGUST 2000
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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