Discussion in 'Homework Help' started by spidermanIIII, Jun 15, 2014.

1. ### spidermanIIII Thread Starter Member

Nov 22, 2013
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first thank you for trying to help me, I am new in studding electronics the problem is I tried to read the data sheet but there are some things I can't understand P0 to P3 are Parallel Inputs what is the meaning of parallel input in decade counter and how can I use them secondly what is CEP and CET and what are they use for and what is TC

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2. ### shteii01 AAC Fanatic!

Feb 19, 2010
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497
From datasheet:
CEP - count-enable P
CET - count-enable T
They both need to be set to High (2-5 volts) to start the count.

The inputs ABCD is to load the starting value. I guess if you connect them to ground (Low), then you load a starting value of 0000. If I read datasheet right, the '160 is BCD counter. So the counter goes:
0000
0001
0010
-
-
-
1001
You start at 0, you end at 9.

3. ### spidermanIIII Thread Starter Member

Nov 22, 2013
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thank you sir but I wanna know what will happen if i connect CET and CEP once active low and once active high what will happen

4. ### shteii01 AAC Fanatic!

Feb 19, 2010
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Nothing.
The count starts when they are both High. If they are both Low, the count is off. If one is High, the other is Low, the count is off.

5. ### shteii01 AAC Fanatic!

Feb 19, 2010
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If you look at the logic diagram of '160, you will see that CEP and CET are connected to AND gate. Do you know truth table for an AND gate?

The output of an AND gate is High only when inputs are High.

So when you send CEP Low and CET High, the output of the AND gate is Low. When you send CEP High and CET Low, the output of the AND gate is Low.

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6. ### spidermanIIII Thread Starter Member

Nov 22, 2013
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sir I see the logic diagram and I fond CEP and CET are conected to NAND gate but the output where it is going to in the attached image

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7. ### shteii01 AAC Fanatic!

Feb 19, 2010
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I was looking at this one: http://www.ti.com/lit/ds/symlink/sn74160.pdf

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8. ### spidermanIIII Thread Starter Member

Nov 22, 2013
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sir can you help me to understand what highlighted

9. ### spidermanIIII Thread Starter Member

Nov 22, 2013
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this is what i highlighted

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10. ### shteii01 AAC Fanatic!

Feb 19, 2010
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The count is paused.
All the cases are listed in the Mode Select Table.

Nov 22, 2013
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