Get Basic Digital Electronics PDF

By Alvis J. Evans

ISBN-10: 079061118X

ISBN-13: 9780790611181

While you are simply beginning out in electronics or want clean . this is often THE ebook . really easy to appreciate . have to prepare for an easy digital examination . this is often THE ebook . nice booklet , you are going to love it . every little thing IS defined IN HUMAN phrases now not advanced engineer phrases . it's a needs to personal for digital technicians .

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Considered obsolete when compared to the newer CMOS line of IC's, and is much slower than any of the TTL series. The 4000 series is also susceptible to damage from electrostatic discharge. 1V IOH(max) = -4mA (source) IOL(max) = 4mA (sink) VOL(max) Comments Improvement in speed over the 4000 CMOS series; as speedy as the 74LSxx TTL series, depending on the operating frequency. Also provides greater noise immunity and greater voltage and temperature operating ranges than TTL. This is a very popular series used today.

These devices are not to be confused with the typical logic gates you have seen so far. Logic gates with open-collector outputs have entirely different output characteristics. 62 shows a NAND gate with open-collector (OC) output. Notice that the Q3 transistor is missing in the OC NAND gate. By removing Q3, the output no longer goes high when A and B logic levels are set to 00, 01, or 10. Instead, the output floats. When A and B logic levels are both high (1), the output is grounded. This means that the OC gate can only sink current, it cannot source current!

68 illustrates what to do with unused inputs for TTL and CMOS NAND and NOR ICs. 362 PRACTICAL ELECTRONICS FOR INVENTORS VCC VCC 1 Used inputs VCC 14 1 13 2 13 12 3 12 3 12 4 11 4 11 4 5 10 5 5 6 9 6 8 7 2 13 3 7 X GND 1 VDD 2 VCC 14 VDD VDD Used inputs TTL 7420 X Used inputs 10 X 9 GND 8 TTL 7427 X 6 Connect unused inputs of a used NAND gate HIGH to maintain proper logic function. Don't assume they'll be naturally HIGH for TTL. Connect unused input of a NOR gate LOW to maintain proper logic function.

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Basic Digital Electronics by Alvis J. Evans


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