Tim
Guest
Thu Oct 14, 2010 1:54 am
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
Guest
Thu Oct 14, 2010 2:47 am
On Wed, 13 Oct 2010 21:54:47 -0300, Tim <tim_at_tim.tim> wrote:
Quote:
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
Guest
Thu Oct 14, 2010 11:59 am
"Tim" <tim_at_tim.tim> schreef in bericht
news:MPG.27202ced946a3d38989751_at_news.aliant.net...
Quote:
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
Guest
Thu Oct 14, 2010 10:17 pm
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_at_dreader14.news.xs4all.nl>,
petrus.bitbyter_at_hotmail.com says...
Quote:
"Tim" <tim_at_tim.tim> schreef in bericht
news:MPG.27202ced946a3d38989751_at_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_at_nospam.nbnet.nb.ca (remove the nospam part)
And If I Forgot To Mention My Location, I'm In The Fredericton Area
Tim
Guest
Thu Oct 14, 2010 10:18 pm
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_at_news.aliant.net>, tim_at_tim.tim
says...
Quote:
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_at_nospam.nbnet.nb.ca (remove the nospam part)
And If I Forgot To Mention My Location, I'm In The Fredericton Area
