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Subject: Re: Weird logic problem
Date: Wed, 16 Oct 2002 21:24:08 +0100
NNTP-Posting-Date: 16 Oct 2002 20:23:43 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Some 1n caps from o/p's to ground may help......
"Richard Webb" wrote in message
> Hi all,
> I'm working on a high speed DSP board. From my DSP I've got some
> decoding which generates chip selects which allows me to write data to
> 74LVC373 latches. The problem is that the data is being latched at the
> times. I've found that when writing as intended the latches work fine, but
> the other latches which aren't being driven are seeing odd spikes on their
> enable lines, which latches data into them when it shouldn't be. The thing
> is that these weird spikes are stopped when I either put a scope probe on
> them, or when I touch my finger on that pin of the IC, or if i just touch
> the pin with a bare piece of wire. It's almost like the pin is
> despite being driven from another logic IC. Does anyone recognise this
> and know what might cause it? I can't find a mistake on the board, but I
> know there must be one becuase the prototype with the same circuit works
> great. Any help would be really appreciated, I'm pulling my hair out with
> this one!
> Richard Webb.
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