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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The datasheet of the AT28C64 makes it pretty clear: With that resistor in series with pin 1, swapping in an 8K ROM instead of the 32K one should work just fine.
Post as a guest Name. I created a circuit in which all the address inputs of an AT28C are connected to outputs of shift registers 74HC And if the datasheet is not absolutely clear, contact the vendor.
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AT28C64 Datasheet pdf – 64K EEPROM with Ready/Busy – Atmel
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Sometimes no connect pins are special function pins and they don’t want you to connect to them. ah28c64
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. 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. at228c64
AT28C64 Datasheet PDF
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AT28C64 Datasheet PDF
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?
Well at2864 connect could mean do not connect or does not connect.
In general, except in cases where the manufacture is specifically supporting compatible footprints between different parts, you should not connect to the NC pins. There are “No Connect” NC pins, those are not connected in the chip so you can hook them up to a voltage.