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SN74HCT138PWT Datasheet(PDF) 2 Page - Texas Instruments |
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SN74HCT138PWT Datasheet(HTML) 2 Page - Texas Instruments |
2 / 21 page SN54HCT138, SN74HCT138 3LINE TO 8LINE DECODERS/DEMULTIPLEXERS SCLS171E − MARCH 1984 − REVISED SEPTEMBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two active-low (G) and one active-high (G) 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. FUNCTION TABLE INPUTS OUTPUTS ENABLE SELECT 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 XH X XX H HH HH HH H L XX X XX H HH HH HH H H LL L LL L HH HH HH H H LL L LH H L H HH HH H H LL L HLH H L HH HH H H LL L HH H HH L H HH H H LL H LL H HH H L HH H H LL H LH H HH HH L H H H LL H HLH HH HH H L H H L L H H H H H H H H H H L |
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