參數(shù)資料
型號(hào)： SN54AHC123AFK
廠商： Texas Instruments, Inc.
英文描述： DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
中文描述： 雙RETRIGGERABLE單穩(wěn)態(tài)多頻振蕩器
文件頁(yè)數(shù)： 10/23頁(yè)
文件大小： 598K
代理商： SN54AHC123AFK
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352G
–
JULY 1997
–
REVISED APRIL 2003
10
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 (see 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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