Multiplexer/Demultiplexer

• May 18, 2005

• #1

H

Help

Advanced Member level 2

Joined

Feb 15, 2005

Messages

617

Helped

7

Reputation

14

Reaction score

3

Trophy points

1,298

Activity points

7,065

Hi,

Anyone can teach me how to use MC14051 Multiplexer/Demultiplexer??

Now i need to control:
1st i need 15 signal so i have 15 input and output is the addressing 4bit.

2nd After finish the 1st step, use a same IC the 4bit addressing become an input and preview 15 signal input become output.

How i doing to contor the signal if using this IC??

Thanks..

 

• May 18, 2005

• #2

S

shafee001

Advanced Member level 4

Joined

May 6, 2004

Messages

114

Helped

16

Reputation

32

Reaction score

4

Trophy points

1,298

Location

Egypt

Activity points

1,078

the pin out of that 4051 and data sheet are attached

 

• May 18, 2005

• #3

H

Help

Advanced Member level 2

Joined

Feb 15, 2005

Messages

617

Helped

7

Reputation

14

Reaction score

3

Trophy points

1,298

Activity points

7,065

Hi,

Can you tell me how to control/connect the multiplexing or demultilexing function? Is it we control by the Z (common input/ouput)?
If Z=1 the Y0-Y7 is input and A0-A2 is output.
If Z=0 the Y0-Y7 is output and A0-A2 is input. am i right??

The 4051 IC just only 7bit, if i need control 16bit in 1 IC which IC should i choose?? (DG506A i think it jst the multiplexing only)

Thanks

 

• May 18, 2005

• #4

S

sp

Full Member level 6

Joined

Jan 1, 2004

Messages

395

Helped

23

Reputation

46

Reaction score

2

Trophy points

1,298

Location

Floating Garden

Activity points

4,044

The 4051 IC just only 7bit, if i need control 16bit in 1 IC which IC should i choose?? (DG506A i think it jst the multiplexing only)

Click to expand...

how about trying cascading both chips...the same type of chips....

regards,
sp

 

• May 19, 2005

• #5

H

Help

Advanced Member level 2

Joined

Feb 15, 2005

Messages

617

Helped

7

Reputation

14

Reaction score

3

Trophy points

1,298

Activity points

7,065

Hi
Can let me know which IC??

Thank you

 

• May 19, 2005

• #6

I

IanP

Advanced Member level 7

Joined

Oct 5, 2004

Messages

7,929

Helped

2,311

Reputation

4,624

Reaction score

531

Trophy points

1,393

Location

West Coast

Activity points

66,416

You can use 2 of 4051s, that will give you 16-to-1 or 1-to-16 multiplexer/demultiplexer. You will have to use address inputs A, B and C as well as Inhibit (as address D, connected through negation to IC2). And, you will have to use external gates to mutiplex/demultiplex 2 outputs to 1 and then, in 2nd stage, one input to 2 inputs of both 4051. To accomplish the latter you will need to use the same logic signal as for Inhibit.
regards,
IanP

 

• May 19, 2005

• #7

H

Help

Advanced Member level 2

Joined

Feb 15, 2005

Messages

617

Helped

7

Reputation

14

Reaction score

3

Trophy points

1,298

Activity points

7,065

Hi,

Can you show me the schematic of connection...?? So that it's more clear...

Thanks...

 

• May 19, 2005

• #8

I

IanP

Advanced Member level 7

Joined

Oct 5, 2004

Messages

7,929

Helped

2,311

Reputation

4,624

Reaction score

531

Trophy points

1,393

Location

West Coast

Activity points

66,416

Fo step 1, use the attached drawing. Keep in mind that 4051 is partially analog circuit so the I0-I15 and Out1/2 sugnals can be from -4,5V to +4.5V. Address lines A, B, C and di are of 0-5V TTL/CMOS levels.
(Summing Opamp at the output is not required, you can connect both pins Out1 and Out2 together..it is just in case you need to feed this signal somewhere else).

For step 2, just feed signal without opamp to both pins Out1 and Out2, and depending on the A, B, C and D address lines you will pick up this signal at one of I0 to I15 lines, this time working as outputs.

Good luck and regards,
IanP

 

• May 19, 2005

• #9

H

Help

Advanced Member level 2

Joined

Feb 15, 2005

Messages

617

Helped

7

Reputation

14

Reaction score

3

Trophy points

1,298

Activity points

7,065

Hi,

IanP said:

For step 2, just feed signal without opamp to both pins Out1 and Out2, and depending on the A, B, C and D address lines you will pick up this signal at one of I0 to I15 lines, this time working as outputs.
IanP

Click to expand...

Sorry... Please can you explain your step2 more crealy because i not understand? Is it the 2 output connected together?

16-to-1_4051
If my ABCD = 1001 and my I0=1 then the output is hight
If my ABCD = 1101 and my I3=1 then the output is hight ..... is it??

1-to-16_4051
If my ABCD = 1001 and my Outpu=1 then the I0=>O0=1
If my ABCD = 1101 and my Outpu=1 then the I3=>O3=1 ..... is it??

What is your summing-opamp function??

Thanks....

 

• May 19, 2005

• #10

I

IanP

Advanced Member level 7

Joined

Oct 5, 2004

Messages

7,929

Helped

2,311

Reputation

4,624

Reaction score

531

Trophy points

1,393

Location

West Coast

Activity points

66,416

First, forget about the opamp. If you read my post carefully, I said that in your example it is not required.
Addressing:
ABCD=0000 --->I0
ABCD=0001 --->I1
..
ABCD=1001 --->I9
..
ABCD=1101 --->I13
For example,
ABCD=1101 is the line 13, so this will be the second 4051, 5th input/output.
It is my sincere belief that you have got it now..
Regards,
IanP

 

• May 20, 2005

• #11

H

Help

Advanced Member level 2

Joined

Feb 15, 2005

Messages

617

Helped

7

Reputation

14

Reaction score

3

Trophy points

1,298

Activity points

7,065

Hi,

Thanks alot .. for your explanation, i will go and try in practical..

Thank You..

 

• Mar 6, 2010

• #12

C

clubmed7

Newbie level 3

Joined

Feb 1, 2010

Messages

3

Helped

0

Reputation

0

Reaction score

0

Trophy points

1,281

Location

Malaysia

Activity points

1,296

mux 4051..did anyone here has this 4051 library ?i need it.. please help me..

 

• Mar 6, 2010

• #13

keith1200rs

Super Moderator

Staff member

Joined

Oct 9, 2009

Messages

10,865

Helped

2,065

Reputation

4,130

Reaction score

1,596

Trophy points

1,403

Location

Yorkshire, UK

Activity points

57,270

Search for CD4051

Keith