SN54/74LS83A 4-BIT BINARY FULL ADDER WITH FAST CARRY The SN54 / 74LS83A is a high-speed 4-Bit binary Full Adder with internal carry lookahead. It accepts two 4-bit binary words (A1 – A4, B 1 – B4) and a Carry Input (C0). It generates the binary Sum outputs ∑1 – ∑4) and the Carry Output (C4) from the most significant bit. The LS83A operates with either active HIGH or active LOW operands (positive or negative logic). The SN54 / 74LS283 is recommended for new designs since it is identical in function with this device and features standard corner power pins. 4-BIT BINARY FULL ADDER WITH FAST CARRY LOW POWER SCHOTTKY CONNECTION DIAGRAM DIP (TOP VIEW) Σ4 15 B4 16 C4 14 C0 13 GND 12 B1 11 A1 10 Σ1 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 2 3 4 5 6 7 8 A4 Σ3 A3 B3 VCC Σ2 B2 A2 PIN NAMES LOADING (Note a) Operand A Inputs Operand B Inputs Carry Input Sum Outputs (Note b) Carry Output (Note b) A1 – A4 B1 – B4 C0 Σ1 – Σ4 C4 HIGH LOW 1.0 U.L. 1.0 U.L. 0.5 U.L. 10 U.L. 10 U.L. 0.5 U.L. 0.5 U.L. 0.25 U.L. 5 (2.5) U.L. 5 (2.5) U.L. J SUFFIX CERAMIC CASE 620-09 16 1 16 1 1 ORDERING INFORMATION SN54LSXXJ SN74LSXXN SN74LSXXD LOGIC DIAGRAM 13 B1 10 11 A2 B2 8 A3 7 3 B3 D SUFFIX SOIC CASE 751B-03 16 NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges. C0 A1 N SUFFIX PLASTIC CASE 648-08 A4 4 B4 1 16 Ceramic Plastic SOIC VCC = PIN 5 GND = PIN 12 = PIN NUMBERS LOGIC SYMBOL 10 11 8 7 3 4 1 16 13 C0 B1 A2 B2 A3 B3 A4 B4 C4 ∑1∑2 ∑3 ∑4 C4 9 6 2 15 14 C1 9 ∑1 C2 6 ∑2 C3 2 ∑3 15 ∑4 14 C4 FAST AND LS TTL DATA 5-81 14 SN54/74LS83A FUNCTIONAL DESCRIPTION The LS83A adds two 4-bit binary words (A plus B) plus the incoming carry. The binary sum appears on the sum outputs (∑1 – ∑4) and outgoing carry (C4) outputs. C0 + (A1+B1)+2(A2+B2)+4(A3+B3)+8(A4+B4) = ∑1+2∑2+4∑3+8∑4+16C4 Where: (+) = plus Due to the symmetry of the binary add function the LS83A can be used with either all inputs and outputs active HIGH (positive logic) or with all inputs and outputs active LOW (negative logic). Note that with active HIGH Inputs, Carry Input can not be left open, but must be held LOW when no carry in is intended. Example: C0 A1 A2 A3 A4 B1 B2 B3 B4 ∑1 ∑2 ∑3 ∑4 C4 Logic Levels L L H L H H L L H H H L L H Active HIGH 0 0 1 0 1 1 0 0 1 1 1 0 0 1 (10+9 = 19) Active LOW 1 1 0 1 0 0 1 1 0 0 0 1 1 0 (carry+5+6 = 12) Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 10, 11, 13, etc. FUNCTIONAL TRUTH TABLE C (n–1) An Bn ∑n Cn L L L L H H H H L L H H L L H H L H L H L H L H L H H L H L L H L L L H L H H H C1 — C3 are generated internally C0 — is an external input C4 — is an output generated internally GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54, 74 – 0.4 mA IOL Output Current — Low 54 74 4.0 8.0 mA FAST AND LS TTL DATA 5-82 SN54/74LS83A DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage Min Typ Unit 2.0 54 V V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = – 18 mA 0.8 – 0.65 – 1.5 Test Conditions Guaranteed Input HIGH Voltage for All Inputs 0.7 74 54 2.5 3.5 V 74 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = VIH per Truth Table 54, 74 0.25 0.4 V IOL = 4.0 mA 74 0.35 0.5 V IOL = 8.0 mA 20 40 µA VCC = MAX, VIN = 2.7 V mA VCC = MAX, VIN = 7.0 V – 0.4 – 0.8 mA VCC = MAX, VIN = 0.4 V –100 mA VCC = MAX mA VCC = MAX Input HIGH Current C0 A or B IIH Max C0 A or B 0.1 0.2 IIL Input LOW Current C0 A or B IOS Output Short Circuit Current (Note 1) ICC Power Supply Current All Inputs Grounded All Inputs at 4.5 V, Except B All Inputs at 4.5 V – 20 39 34 34 VCC = VCC MIN, VIN = VIL or VIH per Truth Table Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C) Limits Symbol Parameter Min Typ Max Unit tPLH tPHL Propagation Delay, C0 Input to any Σ Output 16 15 24 24 ns tPLH tPHL Propagation Delay, Any A or B Input to Σ Outputs 15 15 24 24 ns tPLH tPHL Propagation Delay, C0 Input to C4 Output 11 15 17 22 ns tPLH tPHL Propagation Delay, Any A or B Input to C4 Output 11 12 17 17 ns Test Conditions VCC = 5.0 V CL = 15 pF Figures 1 and 2 AC WAVEFORMS VIN 1.3 V 1.3 V tPHL VOUT 1.3 V VIN 1.3 V 1.3 V tPLH tPLH 1.3 V VOUT Figure 1 1.3 V Figure 2 FAST AND LS TTL DATA 5-83 tPHL 1.3 V