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M74HC181 Scheda tecnica(PDF) 3 Page - STMicroelectronics |
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M74HC181 Scheda tecnica(HTML) 3 Page - STMicroelectronics |
3 / 13 page TRUTH TABLE 1 Selection ACTIVE LOW DATA M = H Logic Functions M = L: Arithmetic Operations S3 S2 S1 S0 Cn = L (no carry) Cn = H (with carry) L L L L F = A F = A Minus 1 F = A L L L H F = AB F = AB Minus 1 F = AB L L H L F = A + B F = AB Minus 1 F = (AB) L L H H F = 1 F = Minus 1 (2’s Compl) F = Zero L H L L F =A+B F =A Plus (A + B) F = A Plus (A + B) Plus 1 L H L H F = B F = AB Plus (A + B) F = AB Plus (A + B) Plus 1 LH H L F = A ⊕ B F = A Minus B Minus 1 F = A Minus B L H H H F = A + B F =A+B F = (A + B) Plus 1 H L L L F = AB F = A Plus (A + B) F = A Plus (A + B) Plus 1 HL L H F = A ⊕ B F = A Plus B F = A Plus B Plus 1 H L H L F = B F = AB Plus (A + B) F = AB Plus (A + B) Plus 1 H L H H F = A + B F =A+B F = (A +B) Plus 1 H H L L F = 0 F = A Plus A * F = A Plus A Plus 1 H H L H F = AB F = AB Plus A F = AB Plus A Plus 1 H H H L F = AB F = AB Plus A F = AB Plus A Plus 1 H H H H F = A F = A F = A Plus 1 * Each bit is shifted to the next more significant position. FIGURE 1 M74HC181 3/13 |
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