74189 DATASHEET PDF

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Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. By continuing to use 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 the datasheet and the store page: Datasheets, Manuals or Parts.

The wires I had bought were faulty.

74189 Datasheet

Papabravo Well-Known Member Oct 10, Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Or rather, were never consistently named in the first place, and eventually datahseet stopped using the 74xxx designations. Articles Top Articles Search resources. Hero Banned Aug 29, Notice also that the identical post has occurred on multiple forums. I thought pullup resistors were only necessary for CMOS.

For a better experience, please enable JavaScript in your browser before proceeding. Notice once again that the original poster seldom returns.

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If you’re after some memory pull some cache chips from an old Yes I know the LEDs are inverted but the chips sense outputs are inverted datashheet. Sign up using Facebook. A value like 10K on each switch should work well. 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.

digital logic – TTL tri-state 16×4 RAM chip not working – Electrical Engineering Stack Exchange

Papabravo Well-Known Member Oct 2, Post as a guest Name. You must log in or register to reply here. They were only made in the s. To participate you need to register. Just look at the date of the OP Media New media New comments Search media. Sign up or log in Sign up using Google.

Thread starter earlbesario Start date Oct 2, Look at the datasheet again. Forums New posts Search forums. Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of datashest741889 policy and cookie policyand that your continued use of the website is subject to these policies.

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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. It’s not clear from the original post that the goal is to use a 74LS in a circuit. In my 40 plus years datashdet the business I don’t think I’ve ever seen that despite using the part on numerous occasions. What actually happened is that they were renamed.

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Here is what I imagine. Where are the pullup resistors for your switches? Are these guys all members of the same class, or worse, team in a class? Replacement Transformer Started by ncag Today at 7: Home Questions Tags Users Unanswered. The datashwet was the equipment I was using. Email Required, but never shown.

Welcome to our site! This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Click here to register now. Note that this is a very old chip.