74F283

INTEGRATED CIRCUITS 74F283 4-bit binary full adder with fast carry Product specification IC15 Data Handbook 1989 Mar 03 Philips Semiconductors Philips Semiconductors Product specification 4-bit binary full adder with fast carry 74F283 FEATURES High speed 4-bit addition Cascadable in 4-bit increments Fast Internal carry look-ahead DESCRIPTION The 74F283 adds two 4-bit binary words (An plus Bn) plus the incoming carry. The binary sum appears on the sum outputs (Σ0–Σ3) and the outgoing carry (COUT) according to the equation: CIN+20(A0+B0)+21(A1+B1)+22(A2+B2)+23(A3+B3) =Σ0+2Σ1+4Σ2+8Σ3+16COUT where (+)=plus Due to the symmetry of the binary add function, the 74F283 can be used with either all active-High operands (positive logic) or with all active-Low operands (negative logic). See Function Table. In case of all active-Low operands (negative logic) the results Σ1–Σ4 and COUT should be interpreted also as active-Low. With active-High inputs, CIN cannot be left open; it must be held Low when no “carry in” is intended. Interchanging inputs of equal weight does not affect the operation, thus A0, B0, CIN can arbitrarily be assigned to pins 5, 6, 7, etc. Due to pin limitations, the intermediate carries of the 74F283 are not brought out for use as inputs or outputs. However, other means can be used to effectively insert a carry into, or bring a carry out from, an intermediate stage. PIN CONFIGURATION Σ1 B1 A1 Σ0 A0 B0 CIN GND 1 2 3 4 5 6 7 8 16 VCC 15 B2 14 A2 13 Σ2 12 A3...