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Sign up or log in Sign up using Google. What actually happened is that they were renamed. Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age.

Articles Top Articles Search resources. Yes I know the LEDs are inverted but the chips sense outputs are inverted too. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and dataheet. For 774189 better experience, please enable JavaScript in your browser before proceeding.

Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: You need pullup resistors. Hero Banned Aug 29, Papabravo Well-Known Member Oct 2, 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.


The issue was the equipment I was using. But you’re likely to never get a response with large bold messages. By continuing to use this site, you are consenting to our use of cookies.

IC+ datasheet & applicatoin notes – Datasheet Archive

It’s not clear from the original post that the goal is to use a 74LS in a circuit. Datashret New media New comments Search media.

Welcome to our site! Papabravo Well-Known Member Oct 10, They’re SRAM, 32KB each, and while you’d never need it all you can easily only use the first 3 address bits data dstasheet accessed 8 bits at a time and ignore the rest. Notice once again that the original poster seldom returns. Notice also that the identical post has occurred on multiple forums.

Click here to register now. In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions.

74189 Datasheet

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. Sign up using Email and Password.


By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It’s neither elegant, nor efficient but it does perform the function. You must log in or register to reply here.

This site uses 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? Look at the datasheet again. To participate you need to register.

electronic enthusiasts out there!!! internal circuirtry of 74LS189-64-bit RAM

Home Questions Tags Users Unanswered. Sign up using Facebook. If you’re after some memory pull some cache chips from an old Potentiometer Questions Started by norbss Yesterday at Datasheets, Manuals or Parts. The wires I had bought were faulty. Forums New posts Search forums. Where adtasheet the pullup resistors for your switches?

Of course you need it ASAP. Note that this 7418 a very old chip. I’m usually pretty good at spotting such “revivals”, but this one escaped.