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SN74AHCT139 데이터시트(PDF) 2 Page - Texas Instruments |
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SN74AHCT139 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 18 page SN54AHCT139, SN74AHCT139 DUAL 2-LINE TO 4-LINE DECODERS/DEMULTIPLEXERS SCLS267M – DECEMBER 1995 – REVISED MARCH 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The active-low enable (G) input can be used as a data line in demultiplexing applications. These decoders/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its driving circuit. FUNCTION TABLE (each decoder/demultiplexer) INPUTS OUTPUTS G SELECT OUTPUTS G B A Y0 Y1 Y2 Y3 H X X H H H H L L LL HH H L L HH LH H L H LH HL H L H H H H H L logic diagram (positive logic) Select Inputs Select Inputs 2B 2A 2G 1B 1A 1G Data Outputs 2Y3 2Y2 2Y1 2Y0 1Y3 1Y2 1Y1 1Y0 1 2 3 15 14 13 4 5 6 7 12 11 10 9 Pin numbers shown are for the D, DB, DGV, J, N, NS, PW, and W packages. |
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