組合邏輯電路一ppt課件-文庫吧資料
2025-01-21 07:09本頁面
【正文】 為 編碼器 。ABF A B A B? ??18 四位二進(jìn)制數(shù)碼比較器 74LS85 A 3A 2A 1A 0B 3B 2B 1B 0I I = I F F =F 7 4 8 519 四位二進(jìn)制數(shù)碼比較器 74LS85 F A B F A = BF A BA 3 B 3 1 0 0A 3 B 3 A 2 B 2 A 1 B 1 A 0 B 0 I I I =X X X X X XA 3 B 3 0 1 0X X X X X XA 3 = B 3 A 2 B 2A 2 B 2A 3 = B 3A 3 = B 3A 3 = B 3A 3 = B 3A 3 = B 3A 2 = B 2A 2 = B 2A 2 = B 2A 2 = B 2A 1 B 1A 1 B 1A 1 = B 1A 1 = B 1XXXX1 0 0X X X0 1 0X X X1 0 0X X X0 1 0X X X1 0 0X X X0 1 0X X XXXA 0 B 0A 0 B 0A 3 = B 3 A 2 = B 2 A 1 = B 1 A 0 = B 0A 3 = B 3 A 2 = B 2 A 1 = B 1 A 0 = B 0A 3 = B 3 A 2 = B 2 A 1 = B 1 A 0 = B 0A 3 = B 3 A 2 = B 2 A 1 = B 1 A 0 = B 01 0 01 0 00 1 00 1 00 0 1X X 10 0 01 1 0A 3 = B 3 A 2 = B 2 A 1 = B 1 A 0 = B 0 1 1 00 0 020 四位二進(jìn)制數(shù)碼比較器 74LS85 FAB FA B FAB FA B FA = B IAB IA = B IA B 7485 FA = B 1 A3 A2 A1 A0 B3 B2 B1 B0 A3 A2 A1 A0 B3 B2 B1 B0 用一片 7485實(shí)現(xiàn) 4位二進(jìn)制數(shù)的比較 21 例 2：設(shè)計(jì)兩個(gè) 8位二進(jìn)制數(shù)的比較電路 解：設(shè)兩個(gè) 8位二進(jìn)制數(shù)分別為 A=A7A6A5A4A3A2A1A0、 B=B7B6B5B4B3B2B1B0 A 3 A 2 A 1 A 0 B 3 B 2 B 1 B 0I I =I F F = F 7 4 L S 8 5A 3 A 2 A 1 A 0 B 3 B 2 B 1 B 0I I =I F F = F 7 4 L S 8 5A 3 A 2 A 1 A 0 B 0B 1B 2B 3A 7 A 6 A 5 A 4 B 4B 5B 6B 7F A B F A = B F A B001四位二進(jìn)制數(shù)碼比較器 74LS85 特點(diǎn)： 串行結(jié)構(gòu)，位數(shù)增多時(shí)，速度受限。ABF A B? ?39。 A B
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