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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.

What actually happened is that they were renamed. To participate you need to register. Hero Banned Aug 29, A value like 10K on each switch should work well. The issue was the equipment I was using. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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.

Sign up using Facebook. Potentiometer Questions Started by norbss Yesterday at They’re SRAM, 32KB each, and while you’d never datzsheet it all you can easily only use the first 3 address bits data is accessed 8 bits at a time and ignore the rest. Email Required, but never shown. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of 7489 website is subject to these policies.


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.

74189 Datasheet

But you’re likely to never get a response with large bold messages. You must log in or register to reply here.

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.

Replacement Transformer Started by ncag Today at 7: Notice also that the identical post has occurred on multiple forums. By continuing to datwsheet this site, you are consenting to our use of cookies.

Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s datashewt datasheet and the store page: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


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

Forums New posts Search forums. Where are the pullup resistors for your switches? This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

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