C2MOS 4K static RAM

Abstract

size, compared with an NMOS RAM of the same capacity, CMOS RAMS have, to date, been limited, at most, to 1K bits. Recently-, higher packing density and reduced cost have been required o f a MOS memory system. CMOS RAMS are no exception. In response t o this demand, a C'MOS(C1ockcd CMOS) 4K static RAM, measuring 4.7 mm square, has been developed. The target for large scale integration, namely 4K bits, within reasonable chip size, has been realized with the following features: (1 ) The RAM is static, in the sense that the content of the On the other hand, having the disadvantage of increased chip