By R. M. M. Oberman (auth.)
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Extra info for Electronic Counters
The commercially available counters of this type miss a check, whether or not its counting operation has been disturbed by outside interference, reversing the state of one or more flip-flops. 3 the fundamental circuit is given of a divide-by-12 counter. This is also a 4-bit binary counter with its operating cycle shortened to 12 by means of extra control circuits. It is commercially available as the SN7492 type counter. 3 Asynchronous divide-by-12 counter pulse-halver (flip-flop Z) and a divide-by-6 counter (sections W, X, Y).
Texas Instruments Integrated Circuits Data Book, SN7493, Texas Instruments Inc. July 1971, 9-19/9-28 2. Texas Instruments Integrated Circuits Data Book, SN7490, Texas Instruments Inc. July 1971,9-4/9-13 3. Texas Instruments Integrated Circuits Data Book, SN7492, Texas Instruments Inc. 1 Explain the difference between a synchronous and an asynchronous operating counter, and show how the fundamental speed disadvantage of an asynchronous counter can be eliminated. 2 Explain the difficulties in design of an asynchronous operating divide-by-N down-counter, in terms of conflict between asynchronous and synchronous operating circuits.
Furthermore, it is noted that the outputs of a binary counter show up and down-counting without changing its internal operation when an exclusive-0 R gate is inserted in each of the flip-flop outputs. One of the inputs of these exclusive-0 R gates has to be connected with the up-down mode control. 1 all were 4-bit binary counters operating in a cycle of 16 pulses. In many applications, however, shorter cycles are wanted. Divide-by-12 counters and decade counters are 48 Electronic counters commercially available in integrated form.