The Am27C040 is a 4 Mbit ultraviolet erasable programmable read-only memory. It is organized as 512K bytes, operates from a single +5 V supply, has a static standby mode, and features fast single address location programming. The device is available in windowed ceramic DIP packages and plastic one-time programmable (OTP) packages. Data can be typically accessed in less than 90 ns, allowing high-performance microprocessors to operate without any WAIT states. The device offers separate Output Enable (OE#) and Chip Enable (CE#) controls,