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Of course you need it ASAP. Look at the datasheet again.

Notice also that the identical post has occurred on multiple forums. Replacement Transformer Started by ncag Today at 7: It’s neither elegant, nor efficient but it does perform the function. Media New media New comments Search media.

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.

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. 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.


I’m usually pretty good at spotting such “revivals”, but this one escaped.

74189 Datasheet

They were only made in the s. Potentiometer Questions Started by norbss Yesterday at Thread starter dataseet Start date Oct 2, Articles Top Articles Search resources. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

Post as a guest Name. Welcome to our site! I thought pullup resistors were only necessary for CMOS. In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions.

Datasheet, PDF – Alldatasheet

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A value like 10K on datahseet switch should work well. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Note that this is a very old chip.

Hero Banned Aug 29, Sign up or log in Sign up using Google. Here is what I imagine. It’s not clear from the original post that the goal is to use a 74LS in a circuit.


(PDF) Datasheet PDF Download – Bit RAM

Or rather, were never consistently dattasheet in the first place, and eventually everyone stopped using the 74xxx designations. By continuing to use this site, you are consenting to our use of cookies. Papabravo Well-Known Member Oct 10, Are these guys all members of the same class, or worse, team in a class? You need pullup resistors.

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You must log in or register to reply here. Datasheets, Manuals or Parts. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Sign up using Facebook. Sign up using Email and Password.

(PDF) 74189 Datasheet download

Just look at the date of the OP Yes I know the LEDs are inverted but the chips sense outputs are inverted too. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: Forums New posts Search forums.

Where are the pullup 71489 for your switches?