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SN74LVC257ADTG4 Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LVC257ADTG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 23 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) 4Y 3Y 2Y 1Y A/B OE 4B 4A 3B 3A 2B 2A 1B 1A 4 2 3 7 5 6 9 11 10 12 14 13 1 15 Pin numbers shown are for the D, DB, J, NS, PW, RGY, and W packages. SN54LVC257A, SN74LVC257A QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCAS294N – JANUARY 1993 – REVISED JUNE 2005 Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators 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. FUNCTION TABLE INPUTS OUTPUT Y OE A/B A B H X X X Z L L L X L L L H X H L H X L L L H X H H LOGIC DIAGRAM (POSITIVE LOGIC) 2 |
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