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MC14028BCP Arkusz danych(PDF) 5 Page - ON Semiconductor |
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MC14028BCP Arkusz danych(HTML) 5 Page - ON Semiconductor |
5 / 8 page MC14028B http://onsemi.com 5 APPLICATIONS INFORMATION Expanded decoding can be performed by using the MC14028B and other CMOS Integrated Circuits. The circuit in Figure 2 converts any 4–bit code to a decimal or hexadecimal code. The accompanying table shows the input binary combinations, the associated “output numbers” that go “high” when selected, and the “redefined output numbers” needed for the proper code. For example: For the combination DCBA = 0111 the output number 7 is redefined for the 4–bit binary, 4–bit gray, excess–3, or excess–3 gray codes as 7, 5, 4, or 2, respectively. Figure 3 shows a 6–bit binary 1–of–64 decoder using nine MC14028B circuits and two MC14069UB inverters. The MC14028B can be used in decimal digit displays, such as, neon readouts or incandescent projection indicators as shown in Figure 4. Figure 2. Code Conversion Circuit and Truth Table INPUTS D MC14028B CB A DC B A D C B A MC14028B Q9 Q0 Q9 Q0 15 – 8 15 – 0 OUTPUT NUMBERS Code and Redefined Output Numbers Hexadecimal Decimal Inputs Output Numbers D C B A 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 2 3 0 2 2 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 3 2 0 3 3 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 4 7 1 4 4 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 5 6 2 3 0 1 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 6 4 3 1 4 0 1 1 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 7 5 4 2 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 8 15 5 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 9 14 6 5 1 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 10 12 7 9 6 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 11 13 8 5 1 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 12 8 9 5 6 1 1 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 13 9 6 7 7 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 14 11 8 8 8 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15 10 7 9 9 |
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