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electronic enthusiasts out there!!! internal circuirtry of 74LS189-64-bit RAM
It’s neither elegant, nor efficient but it does perform the function. Email Required, but never shown. Replacement Transformer Started by ncag Today at 7: Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: Datasheets, Manuals or Parts.
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TTL-series SRAM demonstration
Here’s the datasheet and the store page: The issue was the equipment I was using. 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. You must log in or register to reply here. Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age.
Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations. It’s not clear from the original post that the 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.
I’m usually pretty good at spotting such “revivals”, but this one escaped. Papabravo Well-Known Member Oct 2, Are these guys all members of the same class, or worse, team in a class? Sign up using Facebook. 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.
Of course you need it ASAP. Click here to register now. Electro Tech is an online community with overmembers who enjoy talking about and datwsheet electronic circuits, projects and gadgets.
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.