Maker Pro
Maker Pro

Looking for a TTL 74 Series Chip

T

Tim

Jan 1, 1970
0
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 -
 
R

Rich Webb

Jan 1, 1970
0
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?
 
P

petrus bitbyter

Jan 1, 1970
0
Tim said:
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
 
T

Tim

Jan 1, 1970
0
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 -
 
T

Tim

Jan 1, 1970
0
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 -
 
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