I2L Static shift register

摘要

Each bit of the register includes a plurality of active elements which perform as NOR logic gates. Each active element comprises an I2L unit consisting of a bipolar inverter transistor and a bipolar injector transistor. Each element is cross-coupled with the previous element and the subsequent element, resulting in the static characteristic of the register. Data transfer control signals are generated which consist of a number of time synchronized pulse trains. Each pulse train is applied to a different one of the active elements in a bit and serves to energize same when positive (high). The shift register is bi-directional. The direction of data transfer is determined solely by the sequence of the data transfer control signals. The register is reset by causing all components of the control signal to simultaneously go low and thereafter restarting same in the proper sequence.