Synchronous Counter (16 bits?)

Discussion in 'The Projects Forum' started by Salvatore, Mar 9, 2016.

1. Salvatore Thread Starter New Member

Mar 9, 2016
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Hello people of the AAC community (I'm new to the AAC forums, so bear with me).

So, to the point. I am given by a teacher this project:

Create and design a Synchronous Counter that starts from the number 42110 reaches 103110 and restarts (a loop from 421 to 1031).

I have to use one of these ics: 74ls163, 74ls191, 74ls93 (in the quantity that's needed) and a Timer555 in burst mode (astable).

I think that i'll go with 4 ics of 74ls163 (correct me if i'm wrong, regarding the number of ics needed). We want the timer to give pulses every 1-2sec (what are the R and C values to achieve that)?
I would appreciate it if you could help me with the design (schematics, wiring etc).

Salvatore

2. blocco a spirale AAC Fanatic!

Jun 18, 2008
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I'm sure your teacher would appreciate it if you do the design for your project.

3. Salvatore Thread Starter New Member

Mar 9, 2016
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Don't get me wrong, i don't want anyone to do the hard job for me. As far as i know the design will be based on this logic
Also i know that i must use the proper logic ics to make the counter stop at 1031. What i want from the people of the forum is to give me some answers on what I ask above and to give me any help they are willing to give. That's all. Sorry for the misunderstanding (and also for my mediocre use of the English language).

4. AnalogKid Distinguished Member

Aug 1, 2013
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Step 3 - the 555 timing components are indicated in a graph in the datasheet.

Step 2 - Do the start and end count values have any characteristics that make this problem easier?

Step 1 - Why 4 counter chips? How many bits does the entire count cycle span? How many chips to cover this span? Why?

ak

5. hp1729 Well-Known Member

Nov 23, 2015
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Your counters are PRESETTABLE? Preset to 421 on a count of 1031.

6. Salvatore Thread Starter New Member

Mar 9, 2016
6
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thanks for the help. The preset number is 421 (decimal) and we want to count till i get to 1031 (decimal). Since the counters will count in binary i thought that 4 4bit counters give us 16 bits since 1031 in binary is 0000010000000111

7. Salvatore Thread Starter New Member

Mar 9, 2016
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and you lost me. i guess the counters must be presetable since i want the count to start from 421 (decimal)

8. blocco a spirale AAC Fanatic!

Jun 18, 2008
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You need 11 bits to count to 1031, so why not use 3x 4-bit counters?

9. Salvatore Thread Starter New Member

Mar 9, 2016
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i guess you are right since these (0000)010000000111 aren't going to change

10. absf Senior Member

Dec 29, 2010
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Do you need to display the result in 7 segment LED or discrete LED?

11. AnalogKid Distinguished Member

Aug 1, 2013
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GUYS - THIS IS HOMEWORK. THE QUESTIONS WERE FOR *H*I*M*.

12. hp1729 Well-Known Member

Nov 23, 2015
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Look at the data sheets for the ICs suggested.

13. absf Senior Member

Dec 29, 2010
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You can preset the counter to 421 during power-up and preset it when it has reach the count 1031 using some 2-inputs gates.

Allen

Salvatore likes this.
14. hp1729 Well-Known Member

Nov 23, 2015
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Data sheets will often include basic application examples.

Salvatore likes this.
15. hp1729 Well-Known Member

Nov 23, 2015
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Not really. 10-bit Ripple Carry Out + a few counts.

16. Salvatore Thread Starter New Member

Mar 9, 2016
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thanks for the help you provided me with, everyone. I think i'll start the project on monday. Hope it goes as planned