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SN74LVTH244APWRE4 Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVTH244APWRE4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 24 page SN54LVTH244A, SN74LVTH244A 3.3-V ABT OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS SCAS586J − DECEMBER 1996 − REVISED OCTOBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The ’LVTH244A devices are organized as two 4-bit line drivers with separate output-enable (OE) inputs. When OE is low, the devices pass data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. 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 1A1 1OE VCC 2OE B 1A2 2A4 2Y4 1Y1 C 1A3 2Y3 2A3 1Y2 D 1A4 2A2 2Y2 1Y3 E GND 2Y1 2A1 1Y4 FUNCTION TABLE (each buffer) INPUTS OUTPUT OE A OUTPUT Y L H H L LL H X Z SN74LVTH244A . . . GQN OR ZQN PACKAGE (TOP VIEW) 1 234 A B C D E |
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