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74189 DATASHEET PDF

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Notice once again that the original poster seldom returns. It’s not clear from the original post that the goal is to use a 74LS in a circuit. Here’s the datasheet and the store page: Home Questions Tags Users Unanswered. Papabravo Well-Known Member Oct 2, They were only made in the s. For a better experience, please enable JavaScript in your browser before proceeding. Hero Banned Aug 29, Email Required, but never shown.

(PDF) 74189 Datasheet download

Look at the datasheet again. You need pullup resistors.

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What actually happened is that they were renamed. Yes I know the LEDs are inverted but the chips sense outputs are inverted too. But you’re likely to never get a response with large bold messages. Here is what I imagine. Datasheets, Manuals or Parts.

It’s neither elegant, nor efficient but it does perform the function.

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. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.

IC+ datasheet & applicatoin notes – Datasheet Archive

Click here to register now. 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. Media New media New comments Search media. Depending on how it was stored over the past 40 years, the chip you have dataxheet simply have expired from old age.

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I thought pullup resistors were only necessary for CMOS. If you’re after some memory pull some cache chips from an old Papabravo Well-Known Member Oct 10, Post as a guest Name. Thread starter earlbesario Start date Datsheet 2, Notice also that the identical post has occurred on multiple forums. Articles Top Articles Search resources. A value like 10K on each switch should work well. In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions.

Just look at the date of the OP Of course you need it ASAP. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them.

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

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Note that this is a very old chip. Are these guys all members of the same class, or worse, team in a class?