參數(shù)資料
型號(hào)： SN54LV123A
廠商： Texas Instruments, Inc.
英文描述： DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
中文描述： 雙RETRIGGERABLE單穩(wěn)多諧振蕩器與施密特觸發(fā)輸入
文件頁(yè)數(shù)： 11/14頁(yè)
文件大?。?/td> 224K
代理商： SN54LV123A
SN54LV123A, SN74LV123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
WITH SCHMITT-TRIGGER INPUTS
SCLS393A – APRIL 1998 – REVISED DECEMBER 1999
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
retriggering data
The minimum input retriggering time (t
MIR
) is the minimum time required after the initial signal before retriggering the
input. After t
MIR
, the device retriggers the output. Experimentally, it also can be shown that, to retrigger the output
pulse, the two adjacent input signals should be t
MIR
apart, where t
MIR
= 0.30
×
t
w
. The retrigger pulse duration is
calculated as shown in Figure 3.
tMIR
tRT
tw
tPLH
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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