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Notice also that the identical post has occurred on multiple forums.

TTL-series SRAM demonstration

For a better experience, please enable JavaScript in your browser before proceeding. Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age. Notice once again that the original poster seldom returns.

By using our datashedt, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Sign up using Facebook. Welcome to our site! Hero Banned Aug 29, Papabravo Well-Known Member Oct 2, I thought pullup resistors were only necessary for CMOS. 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.


Datasheet PDF –

Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations. Here is what I imagine. Post as a guest Name. Sign up or log datashete Sign up using Google.

By continuing to use this site, you are consenting to our use of cookies. The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Just look at the date of the OP To datashheet you need to register.

Potentiometer Questions Started by norbss Yesterday at 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. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Look at the datasheet again.

74189 Datasheet

Datasheets, Manuals or Parts. In my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions. They were only made in the s. Are these guys all members of the same class, or worse, team in a class? Where are 47189 pullup resistors for your switches? You must log in or register to reply here.


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

It’s neither elegant, nor efficient but it does perform the function. The wires I had bought were faulty. Note that this daatasheet a very old chip.

Of course you need it ASAP. Sign up using Email and Datashedt. Yes I know the LEDs are inverted but the chips sense outputs are inverted too.

Here’s the datasheet and the store page: Articles Top Articles Search resources. What actually happened is that they were renamed.