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Systèmes élec. & informatiques (MESISI120424)
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74HC393, quelle(es) affirmation (s) est vraie (s)?
The master resets are active-HIGH asynchronous inputs to each 4-bit counter identified by the "1" and "2" in the pin description.A HIGH level on the nMR input overrides the clock and sets the outputs LOW.
74HC393, quelle (es) affirmation (s) est fausse (s) ?
The 74HC/HCT393 are 4-bit binary ripple counters with separate clocks (1CP and 2 CP) and master reset (1MR and 2MR) inputs to each counter. The operation of each half of the "393" is the same as the "93" except no externalclock connections are required.The counters are triggered by a HIGH-to-LOW transition of the clock inputs. The counter outputs are internally connected to provide clock inputs to succeeding stages.
Le circuit intégrés 74 HC4051:
choisir le ou les affirmations correctes:
74HC393, quelle (es) affirmation (s) est fausse (s) ?
The 74HC/HCT393 are 4-bit binary ripple counters with separate clocks (1CP and 2 CP) and master reset (1MR and 2MR) inputs to each counter. The operation of each half of the "393" is the same as the "93" except no externalclock connections are required.The counters are triggered by a HIGH-to-LOW transition of the clock inputs. The counter outputs are internally connected to provide clock inputs to succeeding stages.
Le circuit intégrés 74 HC4051:
choisir le ou les affirmations correctes:
74HC74, quelle est l'affirmation fausse ?
- H = High-level = « 1 » logique
- L = Low-level = « 0 » logique
- I = Input
- O = Output
- Une tension en entrée > VIH est un H logique,
- Une tension en entrée < VIL est un L logique,
- Le comportement du composant n’est pas défini pour une tension intermédiaire (entre VIL et VIH) !
Quelle (es) affirmation (s) est (sont) vraie (s)?
Soit le circuit suivant:
Pour réaliser un compteur qui compte jusqu'à 3 et recommence
74HC393, quelle(es) affirmation (s) est vraie (s)?
The master resets are active-HIGH asynchronous inputs to each 4-bit counter identified by the "1" and "2" in the pin description.A HIGH level on the nMR input overrides the clock and sets the outputs LOW.