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Old 22nd Feb 2021, 11:41 pm   #4
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 4,468
Default Re: Plastic or ceramic ICs?

When I was using them in the early 1970's, as well as a wider temperature range, the military TTL devices were specced for a wider supply voltage tolerance. From memory, standard 74xx series was 5V +- 0.25V, 54xx series 5V +- 0.5V.
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