I am building a memory module for an 8-bit computer, and am running into an issue. (Following this schematic, but using an IDT6116 instead of the AS6C6264 shown)
The chip is receiving 5V, which is within the tolerances listed on the datasheet. I have connected the outputs to 8 LEDs and tied all address inputs low. The CE and OE pins have been tied low (as shown in the schematic), and the WE pin is tied high. At first everything works as expected. I can view each byte of junk data the SRAM has been initialized with. After a while in this state the chip will begin to heat up and then all of the outputs switch to low, regardless of their previous state and without any intervention on my part. The datasheet I am referring to for the IDT6116 SRAM chip can be found here. The SRAM chip does not appear to be damaged by this, as when power is cycled off and back on again it returns to working normally. I have observed this behavior with all 3 IDT6116 chips I ordered.