Download PDF by R. M. M. Oberman (auth.): Electronic Counters

By R. M. M. Oberman (auth.)

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Extra info for Electronic Counters

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In fact this integrated circuit contains an independent operating 3-bit binary counter and a pulse halver. The sections of 4-bit counters in this book are always indicated with the letters W, X, Y, Z, representing the counter sections with weights 8, 4, 2, 1 respectively. This allows an easy extension of a counter with higher weighted sections without disturbing the systematic relation Electronic counters 30 between weight and letter indication. The same type of relation between weight and letter indication can be obtained in the following way: A= I, B = 2, C = 4, D = 8, etc.

1 Complete counting cycle The most used type of electronic counter is the natural binary counter (ordinarily called binary counter), that is a counter which runs under the control of n successive counting pulses a through code combinations which are the binary equivalent of the decimal numbers 0 ... n. 1 wx y z 8 4 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 0 0 0 0 0 1 1 0 1 0 1 1 1 0 0 0 a 0 0 1 1 0 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 0 1 Asynchronous binary counters 29 In the beginning of the design of electronic counters the asynchronous or ripple-through mode of operation was nearly always used.

N. 1 wx y z 8 4 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 0 0 0 0 0 1 1 0 1 0 1 1 1 0 0 0 a 0 0 1 1 0 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 0 1 Asynchronous binary counters 29 In the beginning of the design of electronic counters the asynchronous or ripple-through mode of operation was nearly always used. 1 for a 4-bit binary counter. 1. 1 Asynchronous binary counter The operation of this type of counter is asynchronous with respect of the incoming counting pulse. It has the inherent disadvantage that the state of the counter follows the incoming counting pulse with a varying delay.

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