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SN74LV138ATNSR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74LV138ATNSR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 19 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) SN74LV138AT 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCLS691 – AUGUST 2005 The conditions at the binary-select inputs (A, B, C) and the three enable inputs (G1, G2A, G2B) select one of eight output lines. The two active-low (G2A, G2B) and one active-high (G1) enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications. This device is fully specified for partial-power-down application susing Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. FUNCTION TABLE ENABLE INPUTS SELECT INPUTS OUTPUTS G1 G2A G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X H X X X X H H H H H H H H X X H X X X H H H H H H H H L X X X X X H H H H H H H H H L L L L L L H H H H H H H H L L L L H H L H H H H H H H L L L H L H H L H H H H H H L L L H H H H H L H H H H H L L H L L H H H H L H H H H L L H L H H H H H H L H H H L L H H L H H H H H H L H H L L H H H H H H H H H H L 2 |
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