74189 DATASHEET PDF

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Welcome to our site! In my 40 plus years in the business I don’t think I’ve ever seen datasheey despite using the part on numerous occasions.

Yes I know the LEDs are inverted but the chips sense outputs are inverted too. Notice also that the identical post has occurred on multiple forums. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

Papabravo Well-Known Member Oct 10, Forums New daatsheet Search forums.

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I’m usually pretty good at spotting such “revivals”, but this one escaped. Are these guys all members of the same class, or worse, team in a dataaheet 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.

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The issue was the equipment I was using. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.

Hero Banned Aug 29, What actually happened is that they were renamed.

For a better experience, please enable JavaScript in your browser before proceeding. If you’re after some memory pull some cache chips from an old Just look at the date of the OP Replacement Transformer Started by ncag Today at 7: They were only made in the s.

Where are the pullup resistors for your switches? By continuing to use this site, you are consenting to our use of cookies.

TTL-series SRAM demonstration

Media New media New comments Search media. I thought pullup resistors were only necessary for CMOS. Note that the value given is positive 40 uAwhich means that the external circuit must source current in order datashete drive the input high — i.

Post as a guest Name. Sign up using Facebook. But you’re likely to never get a response with large bold messages.

74189 Datasheet

A value like 10K on each switch should work well. They’re SRAM, 32KB each, and while you’d never need it all you can easily only use the first 3 address bits data is accessed 8 bits at a time and ignore the rest.

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(PDF) 74189 Datasheet download

Here’s the datasheet and the store page: Note that this is a very old chip. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Home Questions Tags Users Unanswered. You need pullup resistors. Potentiometer Questions Started by norbss Yesterday at Email Required, but never shown.

Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: