74189 DATASHEET PDF

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Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at The issue was datasheft equipment I was using. For a better experience, please enable JavaScript in your browser before proceeding. Look at the datasheet again.

Forums New posts Search forums. It’s not clear from the original post that the goal is to use a 74LS in a circuit. 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. Sign up or log in Sign up using Google.

Hero Banned Aug 29, Yes I know the LEDs are inverted but the chips sense outputs are inverted too. 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. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations. You need pullup resistors. Thread starter earlbesario Start date Oct 2, 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.

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In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions. Post as a guest Name.

Home Questions Tags Users Unanswered. Click here to register now. Datasgeet is what I imagine. Potentiometer Questions Started by norbss Yesterday at The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Media New media New comments Search media. Here’s the datasheet and the store page: They were only made in the s.

Note that this is a very old chip. I’m usually pretty good at spotting such “revivals”, but this one escaped. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Email Required, but never shown.

(PDF) 74189 Datasheet download

Datasheets, Manuals or Parts. The wires I had bought were faulty. Papabravo Well-Known Member Oct 2, A value like 10K on each switch should work well. Where are the pullup resistors for your switches? Sign up using Email and Password. Sign up using Facebook.

Datasheet PDF –

Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: To participate you need to register. But you’re likely to never get a response with large daatasheet messages.

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Electro Tech is an online community with overdatasheeh who enjoy talking about and building electronic circuits, projects and gadgets. Notice once again that the original poster seldom returns. Depending on how it was stored over the past 40 years, the chip you have may simply have dataasheet from old age. Articles Top Articles Search resources. You must datawheet in or register to reply here. Just look at the date of the OP Welcome to our site!

Papabravo Well-Known Member Oct 10, What actually happened is that they were renamed. 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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It’s neither elegant, nor efficient but it does perform the function. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I thought pullup resistors were only necessary for CMOS.

Of course you need datashedt ASAP. If you’re after some memory pull some cache chips from an old Notice also that the identical post has occurred on multiple forums.