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SN74LVTH16245AGQLR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVTH16245AGQLR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page SN54LVTH16245A, SN74LVTH16245A 3.3V ABT 16BIT BUS TRANSCEIVERS WITH 3STATE OUTPUTS SCBS143P − MAY 1992 − REVISED SEPTEMBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) These devices can be used as two 8-bit transceivers or one 16-bit transceiver. They allow data transmission 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 that the buses are effectively isolated. Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, 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. 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 123456 A 1DIR NC NC NC NC 1OE B 1B2 1B1 GND GND 1A1 1A2 C 1B4 1B3 VCC VCC 1A3 1A4 D 1B6 1B5 GND GND 1A5 1A6 E 1B8 1B7 1A7 1A8 F 2B1 2B2 2A2 2A1 G 2B3 2B4 GND GND 2A4 2A3 H 2B5 2B6 VCC VCC 2A6 2A5 J 2B7 2B8 GND GND 2A8 2A7 K 2DIR NC NC NC NC 2OE NC − No internal connection FUNCTION TABLE (each 8-bit section) INPUTS OPERATION OE DIR OPERATION L L B data to A bus L H A data to B bus H X Isolation GQL OR ZQL PACKAGE (TOP VIEW) A B C D E F G H J K 1 2345 6 |
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