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SN74LVTH245ANSRE4 Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVTH245ANSRE4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 21 page SN54LVTH245A, SN74LVTH245A 3.3V ABT OCTAL BUS TRANSCEIVERS WITH 3STATE OUTPUTS SCBS130T − MAY 1992 − REVISED SEPTEMBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) These devices are designed for asynchronous communication between data buses. They transmit data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the devices so the buses are effectively isolated. 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. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict. terminal assignments 1234 A A1 DIR VCC OE B A3 B2 A2 B1 C A5 A4 B4 B3 D A7 B6 A6 B5 E GND A8 B8 B7 FUNCTION TABLE INPUTS OPERATION OE DIR OPERATION L L B data to A bus L H A data to B bus H X Isolation logic diagram (positive logic) DIR OE A1 B1 To Seven Other Channels 1 2 19 18 Pin numbers shown are for the DB, DW, FK, J, NS, PW, RGY, and W packages. SN74LVTH245A . . . GQN OR ZQN PACKAGE (TOP VIEW) 1 234 A B C D E |
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