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Systèmes élec. & informatiques (MESISI120424)
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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 ci-dessous est alimenté avec un signal PWM (e(t) est un signal PWM) on peut récupérer la tension moyenne du signal :
La tension moyenne d'un signal PWM ayant un rapport cyclique de 20% et une amplitude Vcc=10V est:
Le circuit intégrés 74 HC4051:
choisir le ou les affirmations correctes:
Pour réaliser un compteur qui compte jusqu'à 7 et recommence
The 74HC74 is dual positive edge triggered D-type flip-flop. They have individual data (nD), clock (nCP), set (nSD) and reset (nRD) inputs, and complementary nQ and nQ outputs. Data at the nD-input, that meets the set-up and hold time requirements on the LOW-to-HIGH clock transition, is stored in the flip-flop and appears at the nQ output.
Quelle affirmation est fausse?
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 affirmation est fausse ?
Quelle est la formule pour calculer la température en degrés Celsius à partir de la tension de sortie du TMP36 ?