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Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age. Note that this is a very old chip.
digital logic – TTL tri-state 16×4 RAM chip not working – Electrical Engineering Stack Exchange
You need pullup resistors. Of course you need it ASAP.
They were only made in the s. Post as a guest Name. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them.
Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.
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Papabravo Well-Known Member Oct 10, Look at the datasheet again. Thread starter earlbesario Start date Oct 2, Sign up using Email datazheet Password. I’m usually pretty good at spotting such “revivals”, but this one escaped.
Articles Top Articles Search resources. The wires I had bought were faulty. Here’s the datasheet and the store page: Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at It’s not clear from the original post that the goal is to use a 74LS in a circuit.
If you’re after some memory pull some cache chips from an old Home Questions Tags Users Unanswered. Click here to register now.
(PDF) 74189 Datasheet download
It’s neither elegant, nor efficient but it does perform the function. In my 40 47189 years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions.
Datasheet, PDF – Alldatasheet
Papabravo Well-Known Member Oct 2, Note that the value given is positive 40 uAwhich means that the external circuit must source current in order to drive the input high — i.
Media New media New comments Search media. Just look at the date of the OP