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SN74HC148D Datenblatt(PDF) 7 Page - Texas Instruments |
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SN74HC148D Datenblatt(HTML) 7 Page - Texas Instruments |
7 / 17 page SN54HC148, SN74HC148 8LINE TO 3LINE PRIORITY ENCODERS SCLS109G − MARCH 1984 − REVISED APRIL 2004 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION 0 1 23 4 5 67 EI EO A0 A1 A2 GS ’HC148 0 1 23 4 5 67 EI EO A0 A1 A2 GS ’HC148 ’HC08 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Enable (active low) 01 2 3 Encoded Data (active low) Priority Flag (active low) 16-Line Data (active low) 0 1 23 4 5 67 EI EO A0 A1 A2 GS ’HC148 0 1 23 4 5 67 EI EO A0 A1 A2 GS ’HC148 ’HC00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Enable (active low) 01 2 3 Encoded Data (active high) Priority Flag (active high) 16-Line Data (active low) Figure 2. Priority Encoder for 16 Bits Because the ’HC148 devices are combinational logic circuits, wrong addresses can appear during input transients. Moreover, a change from high to low at EI can cause a transient low on GS when all inputs are high. This must be considered when strobing the outputs. |
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