AT28C64 DATASHEET PDF

July 17, 2019 posted by

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AT28C64 Datasheet PDF

This does exactly what you say, i. Well no connect could mean do not connect or does not connect.

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They can usually answer these types of questions.

AT28C64 Datasheet(PDF) – ATMEL Corporation

And if the datasheet is not absolutely clear, contact the vendor. Is it OK dafasheet to connect such pins to outputs of shift registers and be able to make a AT28C64 like a drop-in replacement for AT28C or are the NC pins internally connected to something?

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In the future I will do many of these circuits, however I haven’t yet decided if I need the full 32KB of memory.

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Other times there may not even be a wire bond between the silicon and the pin, so you are free to do whatever you want with it.

I created a circuit in which all the address inputs of an AT28C are connected to outputs of shift registers 74HC Sign up or log in Sign up using Google.

Sign up using Facebook. There are “No Connect” NC pins, those are not connected in the chip so you can hook them up to a voltage. With that resistor in series with pin 1, swapping in an 8K ROM instead of the 32K one should work just fine.

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In general, except in cases where the manufacture is specifically supporting compatible footprints between different parts, you should not connect to the NC pins.

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After looking at the datasheets, I notice the difference in pin-out between the two chips is that on the AT28C64, A13 and A14 are replaced with NC no connects. That’s the obvious part. Email Required, eatasheet never shown.

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Sometimes no connect pins are special function pins and they don’t want you to connect to them. For memory chips in particular, pins that get used as address pins in larger parts and are NC pins in smaller parts can usually be connected. The datasheet of the AT28C64 makes it pretty clear: