| Author |
Message |
neoaspilet11
Joined: 29 Sep 2005
Posts: 276
Helped: 21
Location: Cebu, Philippines
|
 22 Nov 2005 5:40 Is there any Positive Logic Output demultiplexer? |
|
|
|
|
Guys,
Is there any chip similar to 74XX138 but its outputs are not inverted?
Thanks for any replies,
neo
|
|
| Back to top |
|
 |
IanP
Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast
|
22 Nov 2005 6:05 Re: Is there any Positive Logic Output demultiplexer? |
|
|
|
|
I don't think you will find one ..
What about using 8 inverters on 138 outputs?
Try 74LS240 with EN1 and EN2 connected to 0V ..
Regards,
IanP
|
|
| Back to top |
|
|
neoaspilet11
Joined: 29 Sep 2005
Posts: 276
Helped: 21
Location: Cebu, Philippines
|
22 Nov 2005 6:40 Is there any Positive Logic Output demultiplexer? |
|
|
|
|
| Yes, IanP. that would work, In fact that is my solution by placing inverters on 74XX138 outputs. But that would not help decreasing the chip count.
|
|
| Back to top |
|
|
IanP
Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast
|
22 Nov 2005 6:52 Re: Is there any Positive Logic Output demultiplexer? |
|
|
|
|
Another option to reduce the number of ICs and replace combination of 138+240 with one IC would be to program and burn a PLD ..
Have a look at: http://home.att.net/~r.g.brown/alta/PLDTUTOR.PDF
Regards,
IanP
|
|
| Back to top |
|
|
Google
AdSense
|
22 Nov 2005 6:52 Ads |
|
|
|
|
|
|
| Back to top |
|
|
sabari
Joined: 02 Oct 2004
Posts: 66
Helped: 1
|
22 Nov 2005 8:26 Is there any Positive Logic Output demultiplexer? |
|
|
|
|
| Yes that would work, In fact that is my solution by placing inverters on 74XX138 outputs. But that would not help decreasing the chip count.
|
|
| Back to top |
|
|
echo47
Joined: 07 Apr 2002
Posts: 4206
Helped: 566
|
22 Nov 2005 11:21 Is there any Positive Logic Output demultiplexer? |
|
|
|
|
http://www.semiconductors.philips.com/pip/74HCT238.html
http://focus.ti.com/docs/prod/folders/print/cd74act238.html
Google for "non-inverting demultiplexer".
|
|
| Back to top |
|
|
