2 Apr
2022
2 Apr
'22
4:11 p.m.
On 4/2/2022 5:49 AM, Noel Chiappa via cctalk wrote:
And, if that 'LS123 wasn't made by TI, it could be considered suspect
until it has been checked out with a 'scope. I remember, from somewhere
back in the day, that not all '123s were created equal, and that TI's
were demonstrably better than the others in terms of stability and
trustworthiness. I also recall *vaguely* one experience where replacing
a '123 made by someone else with a TI one fixed the issue.
JRJ
does
[disabling the MCLK counter via DCLO, asserted by the two
E126 monostable chain from ACLO] happen just on power-down, or on
power-up too? I'd need to understand how that two monostable chain
works in both cases, which I currently don't. (I only understand
monostables when pulses trigger them, not edges, which is a big part of
why I don't completely understand it.)
So this was bugging me, so I hauled out my TI TTL databook and looked up the
LS123.