74688 vs 74684

[[email protected]]

I have been looking for a 74688 for my project (elektor Logic Analyzer)
But have not been able to find any who sells it anymore.

The 74684 is though easily obtainable. The pinout-differens is that of
pin one on the 688 has an Enable-input (which is connected to ground
for enabeling for ever in this project) and the same pin one on the 684
has an output of no interest for me. Otherwise they look the same - but
will they really perform the same way?

I have bought a 684 but then again I get nervouse. Huuuhh. The
datasheets can be found (among many other places) on
www.alldatasheet.com

Could somebody with more experiens than me please comment. I would then
be able to loose that Huuuhh-feeling.
Happy easter hollydays!

 

[Andrew Holme]

I have been looking for a 74688 for my project (elektor Logic
Analyzer) But have not been able to find any who sells it anymore.

The 74684 is though easily obtainable. The pinout-differens is that of
pin one on the 688 has an Enable-input (which is connected to ground
for enabeling for ever in this project) and the same pin one on the
684 has an output of no interest for me. Otherwise they look the same
- but will they really perform the same way?

I have bought a 684 but then again I get nervouse. Huuuhh. The
datasheets can be found (among many other places) on
www.alldatasheet.com

Could somebody with more experiens than me please comment. I would
then be able to loose that Huuuhh-feeling.
Happy easter hollydays!

Yes, they're otherwise functionally identical. Compare the internal
schematics. This datasheet covers both:
http://diana.ee.pucrs.br/~lep/ftp/inicio/datasheets/circ_int/ttl/motorola/74684.pdf

Just don't gound pin 1

 

[[email protected]]

My deepest respect to Mr Andrew. All of my Huuhhh are now gone far
away. I'm happy again. )