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SN74AS882ADW 데이터시트(PDF) 8 Page - Texas Instruments |
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SN74AS882ADW 데이터시트(HTML) 8 Page - Texas Instruments |
8 / 9 page SN54AS882A, SN74AS882A 32-BIT LOOK-AHEAD CARRY GENERATORS SDAS235 – D2661, DECEMBER 1982 – REVISED NOVEMBER 1985 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 8 TYPICAL APPLICATION DATA The application given in Figure 1 illustrates how the ’AS882A can implement look-ahead carry for a 32-bit ALU (in this case, the popular ’AS881A) with a single package. Typical carry times shown are derived using the standard Advanced Schottky load circuit. ’AS881A ’AS881A ’AS881A Cn+16 Cn + 8 ’AS881A 6 ns 6 ns A B Cn Cn–4 ’AS881A Cn–4 Cn Cn B A B A F F F ’AS881A Cn F A B 6 ns F Cn–4 Cn–4 Cn–4 P0G0G1 P1G2 P2P4G4 P3G3 F F B A B A B A B A F G5 P5G6 P6G7 P7 Cn + 24 7 ns MSB LSB Cn ’AS882A Cn + 32 Cn Cn Cn Cn Cn–4 Cn–4 Cn–4 ’AS881A ’AS881A 6 ns 6 ns 6 ns 6 ns 6 ns 6 ns Figure 1 Likewise, Figure 2 illustrates the same 32-bit ALU using two ’AS882s. This shows the worst-case delay from LSB to MSB to be 19 ns as opposed to 25 ns in Figure 1. Cn 6 ns 7 ns F F A 44 B 4 A 4 B 4 A LSB B 4 Cn L P0G0 H G1 P1 G2 P2 Cn Cn Cn + 8 4 B A 4 B 4 4 A F Cn 6 ns 4 A B 4 F F ’AS881A ’AS881A ’AS881A ’AS881A ’AS881A ’AS881A ’AS881A ’AS881A Cn Cn Cn Cn F F F A B 4 A 4 B Cn + 16 Cn + 24 Cn + 32 P3G3P4G4P6G6P7G7 G5 P5 ’AS882A P0G0P1G1Cn + 16 P2 Cn G2P3G3 P4G4 ’AS882A P5G5G6 P6 Cn + 24 P7G7 Cn + 32 MSB 6 ns 6 ns 6 ns 6 ns 6 ns Figure 2 |
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