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I am building an eeprom programmer for the 28C64A (dip package) with my old basic stamp ii "homework" board (lost my arduino in the move). I have the first four address and data pins, as well as W E and G connected from P0 to P10. I am working with what I already have, so buying shift registers and friends is not an option. My question is that I read over the eeproms datasheet and it said nothing about leaving unconnected pins floating, so is it okay to do that, or must they be grounded?

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Read the part about input current. Close to zero, right? It's a CMOS chip, so you must tie all the inputs to appropriate logic levels (high or low, depending on what you want).

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  • \$\begingroup\$ Just in case the "C" in the middle of the part number didn't give it away... \$\endgroup\$ – Ignacio Vazquez-Abrams Mar 2 '14 at 20:26

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