Maurice Tutor

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Category > Computer Science Posted 17 Jul 2017 My Price 4.00

capacitance

The output pulse width from a 74121 OS is given by the approximate formula

width=

where RT is the resistance connected between the REXT/CEXT pin and Vcc and CT is the capacitance connected between the CEXT  pin and the REXT/CEXT pin. The value for RT can be varied between 2 and  40 kΩ, CTand can be as large as 1000 μF.

(a) Show how a 74121 can be connected to produce a negative-going pulse with a 5-ms duration whenever either of two logic signals (E or F) makes a NGT. Both E and F are normally in the HIGH state.

(b) Modify the circuit so that a control input signal, G, can disable the OS output pulse, regardless of what occurs at E or F.

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Maurice Tutor
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Status NEW Posted 17 Jul 2017 10:07 PM My Price 4.00

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