Fast Programmable 256K Read Only Memory with On-Chip Test Circuits

A 32K X 8 bits EPROM which satisfies all requirements for a high-density EPROM, has been developed. The fast programming time is achieved by introducing a DSA structure into the memory cell. The low power consumption and fast access time are realized by utilizing n-well CMOS peripheral circuits. Various test circuits are implemented to alleviate lengthy screening time. Typical programming time, access time, and power dissipation are 3/spl mu/byte, 100 ns, and 5 mA, respectively.