3 ms·
Wouldn't replacing the 74S86 with a 74VHC86 have worked? I'm a hobbyist, so my knowledge is pretty limited[1], but I was under the impression that the VHC serie
by Declanomous 9y ago
Wouldn't replacing the 74S86 with a 74VHC86 have worked? I'm a hobbyist, so my knowledge is pretty limited[1], but I was under the impression that the VHC series chips were drop-in replacements for the S series in both timing and logic levels.
[1] Read as 'I know just enough to be dangerous, but not enough to understand why what I'm doing is dangerous.'
- CodeWriter23 9y agoThe way to confirm your assumption is to look at the different typical timing waveform charts from the data sheet for each part. I once traced hundreds of thousands of dollars worth of bunk boards back to some RAM chips substituted on the basis of being a "drop in replacement" by the procurement department. The timing diagrams revealed the replacements possessed different timing characteristics. Enough so that the chips would occasionally leave the bus floating when the memory was read from the host side.
- katastic 9y ago"It's not a hardware problem, it's a human problem!"