Looking for a TTL 74 Series Chip

[Tim]

The one I need would be similar to the 74148, but I need it to latch the
3 bit output. I have tried Google, but it always ends up with the 74148,
74238, 74348 or the 3 to 8 line instead.

I am hoping someone remembers using these and could direct me to the
proper part number.

Thanks in advance,

- Tim -

 

[Rich Webb]

On Wed, 13 Oct 2010 21:54:47 -0300, Tim <tim@tim.tim> wrote:

The one I need would be similar to the 74148, but I need it to latch the
3 bit output. I have tried Google, but it always ends up with the 74148,
74238, 74348 or the 3 to 8 line instead.

I am hoping someone remembers using these and could direct me to the
proper part number.

I don't but, if all else fails, you may consider implementing the
function in a GAL or small CPLD. Or, just add some D flip-flops
downstream of the encoder, suitably clocked?

--
Rich Webb Norfolk, VA

 

[petrus bitbyter]

"Tim" <tim@tim.tim> schreef in bericht
news:MPG.27202ced946a3d38989751@news.aliant.net...

The one I need would be similar to the 74148, but I need it to latch the
3 bit output. I have tried Google, but it always ends up with the 74148,
74238, 74348 or the 3 to 8 line instead.

I am hoping someone remembers using these and could direct me to the
proper part number.

Thanks in advance,

- Tim -

Guess you need a 74278 though I doubt it to be available anymore. FAIK there
have not been LS or HCT versions either. As Rich mentioned already the
function can be easily programmed in a GAL20V8 or similar. (At least I can
do so.) Though unless you making a one of, you better consider another
approach as the small GALs tend to become obsolete.

petrus bitbyter

 

[Tim]

Thanks for the response, but I think I'll just add a latch to the 74148
chip. That seems to be the easiest approach.

- Tim -



In article <4cb6e29c$0$8612$e4fe514c@dreader14.news.xs4all.nl>,
petrus.bitbyter@hotmail.com says...

"Tim" <tim@tim.tim> schreef in bericht
news:MPG.27202ced946a3d38989751@news.aliant.net...
The one I need would be similar to the 74148, but I need it to latch the
3 bit output. I have tried Google, but it always ends up with the 74148,
74238, 74348 or the 3 to 8 line instead.

I am hoping someone remembers using these and could direct me to the
proper part number.

Thanks in advance,

- Tim -

Guess you need a 74278 though I doubt it to be available anymore. FAIK there
have not been LS or HCT versions either. As Rich mentioned already the
function can be easily programmed in a GAL20V8 or similar. (At least I can
do so.) Though unless you making a one of, you better consider another
approach as the small GALs tend to become obsolete.

petrus bitbyter

--
Email - tempowl@nospam.nbnet.nb.ca (remove the nospam part)

And If I Forgot To Mention My Location, I'm In The Fredericton Area

 

[Tim]

I guess such a critter does not exist. I will be adding a latch to the
74148 style chip to solve the issue.


Thanks for responses.

- Tim -







In article <MPG.27202ced946a3d38989751@news.aliant.net>, tim@tim.tim
says...

The one I need would be similar to the 74148, but I need it to latch the
3 bit output. I have tried Google, but it always ends up with the 74148,
74238, 74348 or the 3 to 8 line instead.

I am hoping someone remembers using these and could direct me to the
proper part number.

Thanks in advance,

- Tim -

--
Email - tempowl@nospam.nbnet.nb.ca (remove the nospam part)

And If I Forgot To Mention My Location, I'm In The Fredericton Area