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SN74LVC244ADBLE Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVC244ADBLE Datasheet(HTML) 2 Page - Texas Instruments |
2 / 23 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) GQN OR ZQN PACKAGE (TOP VIEW) 1 2 3 4 A B C D E SN74LVC244A OCTAL BUFFER/DRIVER WITH 3-STATE OUTPUTS SCAS414X – NOVEMBER 1992 – REVISED MARCH 2005 The SN74LVC244A is organized as two 4-bit line drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in a mixed 3.3-V/5-V system environment. 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. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. TERMINAL ASSIGNMENTS 1 2 3 4 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 Y OE A L H H L L L H X Z 2 |
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