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SN74ABT646ANSR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74ABT646ANSR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 24 page SN54ABT646A, SN74ABT646A OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3STATE OUTPUTS SCBS069H − JULY 1991 − REVISED MAY 2004 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information(continued) Output-enable (OE) and direction-control (DIR) inputs are provided to control the transceiver functions. In the transceiver mode, data present at the high-impedance port can be stored in either register or in both. The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. The direction control (DIR) determines which bus receives data when OE is low. In the isolation mode (OE high), A data can be stored in one register and/or B data can be stored in the other register. When an output function is disabled, the input function still is enabled and can be used to store and transmit data. Only one of the two buses, A or B, can be driven at a time. These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. |
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