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synchronous counter
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Topic: synchronous counter (Read 1321 times)
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Abayomi
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synchronous counter
«
on:
September 09, 2016, 08:35:02 pm »
Am trying to design a circuit that I will use one synchronous decade counter (74192) to control one 7-segment decoder(7447) . This decoder through a 1-4 demultiplexer is used to drive three 7-segments displays individually. The problem am now having is how to hold the voltages at each output of the demultiplexer when switching between outputs
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Abayomi
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Re: synchronous counter
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Reply #1 on:
September 09, 2016, 09:39:15 pm »
Any help please
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MosherIV
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Re: synchronous counter
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Reply #2 on:
September 10, 2016, 09:16:42 am »
There are 2 tecniques:
1 latch the data/pattern into a buffer.
2. Do the multiplexing so fast that the eye sees all 3 displays, relies on persistence of vision.
For more/better help you will have to show a schematic of your circuit.
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David Hess
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DavidH
Re: synchronous counter
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Reply #3 on:
September 11, 2016, 02:49:02 am »
Usually the multiplexer drives the 7447 with 4-bit BCD and the 7-segment displays are scanned. This works fine even with 8 displays and the multiplexer only needs to be 4 bits wide instead of 7 or 8 bits wide.
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