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First of all, I don't know if this kind of question is allowed here, so sorry if it isn't.

I am looking for a 7400 series register which has common in and out pins (like for the RAM ou EEPROM: 28C16) with a load signal and a store signal. I searched on Google but I didn't found anything (maybe my searches are wrong).

Does it exist and if yes, what is its name/reference?

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    \$\begingroup\$ How about an 8 bit addressable latch... assets.nexperia.com/documents/data-sheet/74HC_HCT259.pdf \$\endgroup\$
    – Trevor_G
    Commented Sep 7, 2017 at 20:55
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    \$\begingroup\$ Wikipedia may help, too: en.wikipedia.org/wiki/List_of_7400_series_integrated_circuits \$\endgroup\$
    – calcium3000
    Commented Sep 7, 2017 at 20:59
  • \$\begingroup\$ Mmh, not really, I would like to be able to modify all the content at once \$\endgroup\$
    – Ardakaniz
    Commented Sep 7, 2017 at 21:01
  • \$\begingroup\$ Yeah, I know this list, but there's 80 different register and none of them indicate common in/out (actually, I think, I has been a bit lazy and didn't check every register...) \$\endgroup\$
    – Ardakaniz
    Commented Sep 7, 2017 at 21:06
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    \$\begingroup\$ "I would like to be able to modify all the content at once " please don't make this a moving target question.... \$\endgroup\$
    – Trevor_G
    Commented Sep 7, 2017 at 21:09

2 Answers 2

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There isn't a register that has common input and output pins, but you can certainly wire up a '373 or '374 (8-bit latch or register with tristate outputs) to achieve that functionality:

schematic

simulate this circuit – Schematic created using CircuitLab

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After deeper research on the Wikipedia list of the 7400 series (https://en.wikipedia.org/wiki/List_of_7400_series_integrated_circuits), I found out the 74299 which has common in/out pins.

I searched with the wrong keyword which should have been "bidirectionnal register".

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