SN54AHC123A, SN74AHC123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS352H − JULY 1997 − REVISED OCTOBER 2005

10

POST OFFICE BOX 655303

APPLICATION INFORMATION

retriggering data

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 (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