12 Jan
2012
12 Jan
'12
9:45 p.m.
On Jan 12, 2012, at 10:00 PM, Ethan Dicks wrote:
One thing to be careful of is that 4116s are sensitive
to the order
that rail voltages are applied and removed. Some classic memory
circuits explicitly control the order, but others I've seen are less
stringent, depending on, I think, charging a large electolytic cap on
the rail that is supposed to be brought up last (can't remember the
proper order - someone else here might, or it should be in the
datasheet). You should be able to find the schematics for the
Defender power supply - be on the lookout for any parts that look odd
or look like they might affect on/off or rise time.
Good to keep in mind. It's worked fine with the AT supply so far, and I don't
remember seeing a sequencing requirement in the datasheets, but it's possible I
overlooked it. Jameco still sells replacements fairly cheap, but I don't relish the
thought of having to replace 24 of them. :-)
- Dave