The MCM63F737K and MCM63F819K are 4Mbit synchronous fast static RAMs designed to provide a burstable, high performance, secondary cache. The MCM63F737K (organized as 128K words by 36 bits) and the MCM63F819K (organized as 256K words by 18 bits) integrate input registers, a 2bit address counter, and high speed SRAM onto a single monolithic circuit for reduced parts count in cache data RAM applications. Synchronous design allows precise cycle control with the use of an external clock (K). Addresses (SA), data inputs (DQx), and all control signals except output enable (G), sleep mode (ZZ), and linear burst order (LBO) are clock (K) controlled through positiveedgetriggered noninverting registers. Bursts can be initiated with either ADSP or ADSC input pins. Subsequent burst addresses can be generated internally by the MCM63F737K and MCM63F819K (burst sequence operates in linear or interleaved mode dependent upon the state of LBO) and controlled by the burst address advance (ADV) input pin. Write cycles are internally selftimed and are initiated by the rising edge of the clock (K) input. This feature eliminates complex offchip write pulse generation and provides increased timing flexibility for incoming signals. Synchronous byte write (SBx ), synchronous global write (SGW ), and synchronous write enable (SW) are provided to allow writes to either individual bytes or to all bytes. The bytes are designated as "a", "b", etc. SBa controls DQa, SBb controls DQb, etc. Individual bytes are written if the selected byte writes SBx are asserted with SW. All bytes are written if either SGW is asserted or if all SBx and SW are asserted.