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SN74AHC123A-EP Arkusz danych(PDF) 9 Page - Texas Instruments

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Numer części SN74AHC123A-EP
Szczegółowy opis  DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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Retriggering Data
t
MIR
t
RT
t
PLH
t
w
Input
Output
t
=t +t
=(K
R
RT
w
PLH
T
T
PLH
´
´ C ) + t
Where:
t
=MinimumInputRetriggering Time
MIR
t
=PropagationDelay
PLH
t
=Retrigger Time
RT
t
=OutputPulseDurationBeforeRetriggering
w
Input
Output
t
=Minimum TimeBetweentheEndoftheSecondInputPulseandtheBeginningoftheRetriggeredOutput
MRT
t
=15ns
MRT
t
MRT
SN74AHC123A-EP
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
SCLS703A – JULY 2006 – REVISED MARCH 2007
APPLICATION INFORMATION (continued)
NOTE: Operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied.
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 = 0.3 × tw. The retrigger pulse
duration is calculated as shown in Figure 3.
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).
Figure 4. Input/Output Requirements
9
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