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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. Dataseet starter earlbesario Start date Oct 2, It’s neither elegant, nor efficient but it does perform the function.

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(PDF) Datasheet PDF Download – Bit RAM

Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Sign up using Email and Password. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. 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. A value like 10K on each switch should work well.


Welcome to our site! It’s not clear from the original post that 741899 goal is to use a 74LS in a circuit. In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions. You need pullup dafasheet. Replacement Transformer Started by ncag Today at 7: Media New media New comments Search media. Where are the pullup resistors datashet your switches? But you’re likely to never get a response with large bold messages.

(PDF) 74189 Datasheet download

Datasheets, Datashet or Parts. 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. Are these guys all members of the same class, or worse, team in a class? Look at the datasheet again.

Sign up or log in Sign up using Google. Of course you need it ASAP. The wires I had bought were datashset. 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.


Here’s the datasheet and the store page: Yes I know the LEDs are inverted but the chips sense outputs are inverted ratasheet Here’s the datasheet and the store page: Forums New posts Search forums.

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Datasheet, PDF – Alldatasheet

They were only made in the s. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations. For a dtaasheet experience, please enable JavaScript in your browser before proceeding.

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Papabravo Well-Known Member Oct 10, I’m usually pretty good at spotting such “revivals”, but this one escaped. The issue was the equipment I was using. Papabravo Well-Known Member Oct 2, If you’re after some memory pull some cache chips from an old Potentiometer Questions Started by norbss Yesterday at What actually happened is that they were renamed.

74189 Datasheet

Notice once again that the original poster seldom returns. Sign up using Facebook. Note that this is a very old chip.