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Ambiguous 74 series logic #1

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NukemD opened this issue Dec 30, 2021 · 1 comment
Open

Ambiguous 74 series logic #1

NukemD opened this issue Dec 30, 2021 · 1 comment

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@NukemD
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NukemD commented Dec 30, 2021

The multitap board design uses generic specifications for 74xx series logic, but uses TSSOP packages where those designations fall apart. Is there an actual part number that can be specified for every 74xx series logic chip in TSSOP?

An example is the 74HC125. You have a half dozen different manufacturers of the chip with different suffixes like PW, PWR, MCT, MCTX that are all not trivial. They differentiate things like the outputs, which would make or break the board. Some have 4 inputs and 4 outputs, some have 4 inputs and 3 outputs and some have 4 inputs and 1 output.

It's not just limited to that one chip though, all of them have different variations available, so the only thing you can do is pick some out and hope those are the right variants that you put in the design.

@splash5
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splash5 commented Jan 4, 2022

AFAIK, the 74 series logic ICs are all the same pinout from DIP/SOP/TSSOP package.
For different suffixes like PW, PWR or MCT, which is named by its manufacturer, but the pinout should be all the same.
If I picked only PW (which is made by Nexperia or TI), someone might think that 74HC125MTC is not compatible.

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