Microcircuits KR1804VA1 are a 4-bit channel transceiver and are designed to connect internal micro-computer devices to the common bus (commands) for use in the microprocessor systems as a buffer register device that performs the function of a bi-directional interface for building controllers of various organization, measuring systems , various data processing systems. Provide bi-directional data transfer and unlimited increase in bit depth. They have a two-port transmitter input, outputs to a channel with a load capacity of 100 mA with an open collector, receiver outputs with three states: threshold voltage of the receiver at a low level of 1.5 V, high level of 2.4 V. There is no parity scheme. Contain 464 integral elements.