Datasheet

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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 =MinimumInputRetriggering Time
MIR
t =PropagationDelay
PLH
t =Retrigger Time
RT
t =OutputPulseDurationBeforeRetriggering
w
Input
Output
t =Minimum TimeBetweentheEndoftheSecondInputPulseandtheBeginningoftheRetriggeredOutput
MRT
t =15ns
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 (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
= 0.3 × t
w
. 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
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