The ZBT RAM is an 8Mbit synchronous fast static RAM designed to provide Zero Bus Turnaroundr. The ZBT RAM allows 100% use of bus cycles during backtoback read/write and write/read cycles. The MCM63Z836 (organized as 256K words by 36 bits) and the MCM63Z918 (organized as 512K words by 18 bits) are fabricated in Motorola's high performance silicon gate CMOS technology. This device integrates input registers, an output register, a 2bit address counter, and high speed SRAM onto a single monolithic circuit for reduced parts count in communication applications. Synchronous design allows precise cycle control with the use of an external positiveedgetriggered clock (CK). CMOS circuitry reduces the overall power consumption of the integrated functions for greater reliability.