If you read the data sheets for most 74XX chips the maximum normal
use is shown to be 5.5VDC, and the absolute maximum voltage (failure
quite certain above this) is 7.0VDC. 74FXX, 74LSXX also fall in the
same regions.
Google "data sheet pdf 74(whatever family/number you are interested in)"
John :-#)#
At 11:18 PM -0500 5/31/04, solarfox@texas.net wrote:
>On Mon, 31 May 2004 22:52:35 -0500, you wrote:
>
>>So, even if a chip's tolerance is listed as +5.25V on it's data sheet, it
>>can still "survive" at the higher voltage?
>
> I think perhaps some manufacturers' chips must be more robust than
>others, because I _have_ seen TTL's get zapped by supply voltages exceeding
>5.25Vdc before, even when the supply didn't drift as far as 6Vdc...
>Nonetheless, it can't hurt to adjust the voltage down to read a proper 5V
>at the edge connector and see if things start working -- you might get
>lucky. :) And if the board still doesn't work, you're no worse off than
>you were before...
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Received on Tue Jun 1 02:31:02 2004
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