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MC14028BFELG Arkusz danych(PDF) 4 Page - ON Semiconductor |
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MC14028BFELG Arkusz danych(HTML) 4 Page - ON Semiconductor |
4 / 7 page MC14028B http://onsemi.com 4 Figure 1. Dynamic Signal Waveforms Inputs B, C, and D switching in respect to a BCD code. Inputs A, B, and D low. All outputs connected to respective CL loads. f in respect to a system clock. 20 ns 20 ns 90% 50% 10% 1/f VDD VSS 20 ns 20 ns INPUT A INPUT C Q4 10% 90% 50% VDD VSS VOH VOL tPLH tPHL tTLH tTHL 50% 90% 10% LOGIC DIAGRAM Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 D C B A 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 |
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