AT28CPC Microchip Technology / Atmel EEPROM 64K 5V w/RDYBSY – NS COM TEMP datasheet, inventory, & pricing. Microchip AT28C64 EEPROM are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Microchip AT28C64 EEPROM. AT28CPC 64k (8k X 8) Parallel EePROMs Features. Fast Read Access Time ns Fast Byte Details, datasheet, quote on part number: AT28C 15PC.
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AT28C64 Datasheet PDF
They can usually answer these types of questions. The datasheet of the AT28C64 makes it pretty clear: Email Required, but never shown.
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. I created a circuit in which all the address inputs of an AT28C are connected to outputs of shift registers 74HC Sign up using Facebook.
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. That’s the obvious part. Is it OK anyway 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?
With that resistor in series with pin 1, swapping in an 8K ROM instead of the 32K one should af28c64 just fine.
AT28C64 datasheet & applicatoin notes – Datasheet Archive
In the future I will do many of these circuits, however I haven’t yet decided if I need the full 32KB of memory. Sign up using Email and Password. Well no connect could mean do not connect or does not connect.
This does exactly what you say, i. Sometimes no connect pins are special function pins and they don’t want you to connect to them. And if the datasheet is not absolutely datqsheet, contact the vendor.
Datawheet 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. In general, except in cases where the manufacture is specifically supporting compatible footprints between different parts, you should not connect to the NC pins.