guys i need help! please give me an idea or schematic diagram of circ, about down counter using 74193 ic ..

 

• Down from what?
• To what?
• Do you know how it starts?
• Will it run once or how will it reset?
• When will it stop?

 

• Down from what?
• To what?
• Do you know how it starts?
• Will it run once or how will it reset?
• When will it stop?

DOWN FROM 0 TO 9 .. IT WILL RESET AT 0 THEN BACK TO 9...

 

DOWN FROM 0 TO 9 .. IT WILL RESET AT 0 THEN BACK TO 9...

Can you count from 9 to 0 backwards?

 

9 TO 0.. IT WILL RESET AT 0 THEN BACK TO 9...

 

Is this homework? And there were a couple of my questions you did not answer.

Have you read the datasheet?

 

Is this homework? And there were a couple of my questions you did not answer.

Have you read the datasheet?

this is an activity, yes i have read the data sheet.. i have tried my idea but the count is 9-7-5-3-1, then back to 9..

circuit must have a continuity sir, it will not run once...

 

i have tried my idea but the count is 9-7-5-3-1

Post the circuit of your idea.
Is the 'activity' a school/college project?

 

And how does it start? Just by powering on?

Is the count from 9 to 0 or is it 9-7-5-3-1? Details are important?

Assuming it's the latter sequence, is there something unique about it? Can you describe it to us? How would you represent it in binary?

 

Post the circuit of your idea.
Is the 'activity' a school/college project?

this is the schematic.. i need it for college project

 

And how does it start? Just by powering on?

Is the count from 9 to 0 or is it 9-7-5-3-1? Details are important?

Assuming it's the latter sequence, is there something unique about it? Can you describe it to us? How would you represent it in binary?

by putting the source on.. the count is from 9-7-5-3-1.. there is nothing unique .. when i turn on the source the clock pulse start then the 7segment just display 9-7-5-3-1 number again and again... 1001 - 0111 - 0101 - 0011 - 0001..

 

Using the A,B,C,D inputs, what value do you need to load in to reset the counter?

 

Using the A,B,C,D inputs, what value do you need to load in to reset the counter?

need the 1 NAND 1 value to reset the counter. 0101,0111,1101,1111???

 

by putting the source on.. the count is from 9-7-5-3-1.. there is nothing unique .. when i turn on the source the clock pulse start then the 7segment just display 9-7-5-3-1 number again and again... 1001 - 0111 - 0101 - 0011 - 0001..

Alec_T asked a good question!

And may I add, there IS something unique about that sequence. Look at it again, either in decimal or binary...

 

Hello,

Have a good look at the binairy values of the A,B,C and D outputs.
How do they relate to the wanted sequence?
Also what values do you need at the input of the counter to start at 9?

Bertus

 

Hello,

Have a good look at the binairy values of the A,B,C and D outputs.
How do they relate to the wanted sequence?
Also what values do you need at the input of the counter to start at 9?

Bertus

Hello,

Have a good look at the binairy values of the A,B,C and D outputs.
How do they relate to the wanted sequence?
Also what values do you need at the input of the counter to start at 9?

Bertus

need 1001 value to start at 9.

 

Alec_T asked a good question!

And may I add, there IS something unique about that sequence. Look at it again, either in decimal or binary...

there is nothing unique , the circuit just display 9-7-5-3-1 values

 

there is nothing unique , the circuit just display 9-7-5-3-1 values

I'm going to be a spoil sport and let you off the hook. In the given sequence the least significant digit is always a 1. So tie that input to the display high. What do the remaining digits do? That's right they go {100, 011, 010, 001, 000}. Those values concatenated with a constant, always 1, least significant digit, make up the desired sequence. Preset the counter to 4, aka 100, let it count down to 0, and reset the counter to 4 on the next clock after the counter reaches 0. Recognizing patterns is half the secret to clever logic and state machine design. It has always worked for me.

 

I'm still puzzled. Do you want to count 9-8-7-6-5-4-3-2-1-0-9-8-7-6-........; or should it be 9-7-5-3-1-0-9-7-5-....... ?

 

Seems like the LSB is stuck high.