A 140 mm/sup 2/ 64 Mb AND flash memory with a 0.4 /spl mu/m technology

This 3.3 V single supply flash memory is for hand-held computers. Low bit cost is a requirement for portable use. AND flash memories have the advantages of small cell size leading to low bit cost and small program/erase size, resulting in fast efficient operation. This 64Mb flash memory is designed for serial-access flash memory cards. Memory array area is reduced by a source line plate layout. Peripheral circuit area is reduced by command/address multiplex for the input circuit, serial address comparison for the redundancy circuit, and an internal low-voltage erase circuit for the X decoder. Using the above methods, a 139.9 mm/sup 2/ chip and 67.4% cell efficiency are realized.