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Note that this is a very old chip. You must log in or register to reply here. But you’re likely to never get a response with large bold messages.

(PDF) 74189 Datasheet download

Note that the value given is positive 40 uAwhich means that the external circuit must source current in order daatasheet drive the input high — i. Here’s the datasheet and the store page: Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Depending on how it was stored over the past 40 years, the chip you have may simply datasheeet expired from old age. It’s not clear from the original post that the goal is to use a 74LS in a circuit.

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Potentiometer Questions Started by norbss Yesterday at Notice also that the identical post has occurred on multiple forums. Post as a guest Name. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms dataeheet serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


TTL-series SRAM demonstration

Papabravo Well-Known Member Oct 2, They were only made in the s. Replacement Transformer Started by ncag Today at 7: Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.

Sign up or log in Sign up using Google. Where are the pullup resistors for your switches? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Look at the datasheet again.

Click here to register now. Here is what I imagine. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the 74819 and the store page: Datasheets, Manuals or Parts. 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.

74189 Datasheet

Media New media New comments Search media. If you’re after some memory pull some cache chips from an old I’m usually pretty good at spotting such “revivals”, but this one escaped.

Home Questions Tags Users Unanswered. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Sign up using Email and Password. Just look at the date of the OP For a better experience, please enable JavaScript in your browser before proceeding.


Notice once again that the original poster seldom returns. A value like 10K on each switch should work well. I thought pullup resistors were only necessary for CMOS. Yes I know the LEDs are inverted but the chips dataasheet outputs are inverted too.

By continuing to use this site, you are consenting to our use of cookies. Sign up using Facebook. This site fatasheet cookies to help personalise content, tailor your experience and to keep you logged in if you register. Are these guys all members of the same class, or worse, team in a class? In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions. To participate you need to register.

Hero Banned Aug 29, The only databook Dataseet have that has anything on it dates fromand byit was no longer listed in any of them.