MC74F646

    These devices consist of bus transceiver circuits with 3-state D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes to a high logic level. Output Enable (OE) and DIR pins are provided to control the transceiver function. In the transceiver mode, data of MC74F646 present at the high impedance port may be stored in either the A or the B register or in both. The select controls of MC74F646 can multiplex stored and real-time (transparent mode) data.The direction control determines which bus will receive data when the enable OE is Active LOW. In the isolation mode (OE HIGH), A data may be stored in the B register and/or B data may be stored in the A register.