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SN74AS181AN 데이터시트(PDF) 6 Page - Texas Instruments |
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SN74AS181AN 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 17 page SN54AS181B, SN74AS181A ARITHMETIC LOGIC UNITS/FUNCTION GENERATORS SDAS209B – DECEMBER 1982 – REVISED DECEMBER 1994 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Table 1 SELECTION ACTIVE-LOW DATA SELECTION M = H M = L; ARITHMETIC OPERATIONS S3 S2 S1 S0 LOGIC FUNCTIONS 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 COMP) 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 L H 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 H L 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 PLUS 1 F = A PLUS 1 † Each bit is shifted to the next more significant position. Table 2 SELECTION ACTIVE-HIGH DATA SELECTION M = H M = L; ARITHMETIC OPERATIONS S3 S2 S1 S0 LOGIC FUNCTIONS Cn = H (no carry) Cn = L (with carry) L L L L F = A F = A F = A PLUS 1 L L L H F = A + B F = A + B F = (A+ B) PLUS 1 L L H L F = AB F = A + B F = (A + B) PLUS 1 L L H H F = 0 F = MINUS 1 (2’s COMPL) F = ZERO L H L L F = AB F = A PLUS AB F = A PLUS AB PLUS 1 L H L H F = B F = (A + B) PLUS AB F =( A + B) PLUS AB PLUS 1 L H H L F = A ⊕ B F = A MINUS B MINUS 1 F = A MINUS B L H H H F = AB F = AB MINUS 1 F = A B H L L L F = A + B F = A PLUS AB F = A PLUS AB PLUS 1 H L L H F = A ⊕ B F = A PLUS B F = A PLUS B PLUS 1 H L H L F = B F = (A + B) PLUS AB F = (A + B) PLUS AB PLUS 1 H L H H F = AB F = AB MINUS 1 F = AB H H L L F = 1 F = A PLUS A† F = A PLUS A PLUS 1 H H L H F = A + B F = (A + B) PLUS A F = (A + B) PLUS A PLUS 1 H H H L F = A + B F = (A + B) PLUS A F =(A + B) PLUS A PLUS 1 H H H H F = A F = A MINUS 1 F = A † Each bit is shifted to the next more significant position. |
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