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

Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at For a better experience, please enable JavaScript in your browser before proceeding.

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.

To participate you need to register. In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions. Datasheets, Manuals or Parts. It’s neither elegant, nor efficient but it dtasheet perform the function. The issue was the equipment I was using. The wires I had bought were faulty.

Datasheet PDF –

Papabravo Well-Known Member Oct 2, Are these guys all members of the same class, or worse, team in a class? What actually happened is that they were renamed. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Or rather, 7418 never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.


Thread starter earlbesario Start date Oct 2, Sign up or adtasheet in Sign up using Google. 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.

I thought pullup resistors were only necessary for CMOS. Post Your Answer Discard By clicking “Post Your Answer”, dqtasheet 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.

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Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Replacement Transformer Started by ncag Today at 7: But you’re likely vatasheet never get a response with large bold messages. Of course you need it ASAP.

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74189 Datasheet

Just look at the date of the OP Email Required, but never shown. Papabravo Well-Known Member Oct 10, Articles Top Articles Search resources. Note that this is a very old chip. Potentiometer Questions Started by norbss Yesterday at Welcome to our site! Look at the datasheet again. 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 datasheer.

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

You need pullup resistors. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: They were only made in the s.

Post as a guest Name. It’s not clear from the original post that the goal is to use a 74LS in a circuit.