Ultra high speed 1K-bit RAM with 7.5 ns access time

A 1024-BIT ECL RAM with typical address access time of 7.5 ns, faster than previously-reported RAMs will be discussed. Write cycle time of 10 11s and write-enable pulsewidth of 3.5 ns are also possible. The memory consists of four blocks of each 256 words x 1 bit, which can be independently selected by four block select terminals, and therefore, may be used as either a 256 words x 4 bits or a 1024 words x 1 bit device