The TMS27C020 series are 262144 by 8-bit (2097152-bit), ultraviolet (UV) light erasable, electrically programmable read-only memories (EPROMs). The TMS27PC020 series are one-time programmable (OTP) electrically programmable read-only memories (PROMs). The product has a storage capacity of 262144 by 8 bits, suitable for microprocessor-based systems, and features high-speed SNAP! pulse programming and power saving CMOS technology.