Basic Digital Electronics by Alvis J. Evans

By Alvis J. Evans

While you're simply beginning out in electronics or want fresh . this is often THE ebook . really easy to appreciate . have to prepare for an uncomplicated digital examination . this is often THE publication . nice e-book , you will adore it . every thing IS defined IN HUMAN phrases now not advanced engineer phrases . it's a needs to personal for digital technicians .

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62. In other words, the outputs of all the gates must float in order to get a high output level. 8 There are special-purpose logic gates that come with Schmitt-triggered inputs. Unlike the conventional logic gates, Schmitt-triggered gates have two input threshold voltages. One threshold voltage is called the positive threshold voltage (VT +), while the other is called the negative threshold voltage (VT −). Example Schmitt-triggered ICs include the quad 7404 inverter, the quad 2-input NAND gate, and the dual 4-input NAND gate shown below.

At first it appears that figuring out what the cross-NOR SR flip-flop does given only two input voltages is impossible, since each of the NOR gates’ inputs depend on the outputs—and what are the outputs anyway? ) Well, first of all, you know that a NOR gate will output a high (logic 1) only if both inputs are low (logic 0). From this you can deduce that if S = 1 and R = 0, Q must be 1 and ෆ Q must be 0, regardless of the outputs—this is called the set condition. Likewise, by similar argument, we can deduce that if S = 0 and R = 1, Q must be 0 and ෆ Q must be 1—this is called the reset condition.

9 Interfacing Logic Families Mixing of logic families, in general, should be avoided. Obvious reasons for not mixing include differences in input/output logic levels, supply voltages, and output drive capability that exist among the various families. Another important reason involves differences in speed between the various families; if you mix slow-logic ICs with faster-logic ICs, you can run into timing problems. There are times, however, when mixing is unavoidable or even desirable. ) only exists in CMOS, but the rest of your system consists of TTL.

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