W27c512-45 pdf

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Author Topic: W27C programmer Read times. Hello - I'm posting in beginners because that's what I am and since I found a few other posts here around the same type of topic, I figured it was the better option than bugging those who know better than I.

I got a few W27C very cheap and figured I would give it a whirl to limit the number of chips needed for some of my plans. I had not realized I needed different voltages to overwrite data. So my first step is to create a reader and then add a writer component to it. But I have a few questions. I have an arduino mini lined up and ready to do this. Not sure how to design a "buffer" around this. I don't see anything preventing this from happening.

Most of the time limits are minimum, and the max limits seems to all be around erasing which isn't using addressing. Should I look for a 14 volt supply voltage and step everything down, or step up from 5v? I think stepping up is best as that's the typical operation voltage. What is this telling me?

What's the diagram supposed to do - is that what's in the chip, or something that's expected to be in the circuit using the chip? Would something like a TL do it? I don't have mine handy at the moment so I can't check but it handles most of the devices I've tried it on. Cost me less than 40 bucks. Quote from: bitman on May 11, , pm. I don't see Windows only being all that much of a problem. My last device programmer required a real parallel port, I just kept an ancient laptop with Win98 on it around just for using that programmer.

Eventually switched to a slightly newer but still ancient XP laptop. You don't have to use your primary PC. Besides using an open collector driver or a discrete solution, some TTL logic families have gates with a diode in series with the emitter of the upper transistor which allows the output to be pulled above the positive supply assuming that the gate output is not low. The , 74L00, , , and 74L04 are examples of gates like this however it is not guaranteed that they will work this way in their specifications so they need to be qualified by the user.