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| SN54/74LS283 4-BIT BINARY FULL ADDER WITH FAST CARRY The SN54 / 74LS283 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 LS283 operates with either active HIGH or active LOW operands (positive or negative logic). 4-BIT BINARY FULL ADDER WITH FAST CARRY LOW POWER SCHOTTKY CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 B3 15 A3 14 3 13 A4 12 B4 11 4 10 C4 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 16 1 J SUFFIX CERAMIC CASE 620-09 1 2 2 B2 3 A2 4 1 5 A1 6 B1 7 C0 8 GND 16 1 N SUFFIX PLASTIC CASE 648-08 PIN NAMES LOADING (Note a) HIGH LOW 0.5 U.L. 0.5 U.L. 0.25 U.L. 5 (2.5) U.L. 5 (2.5) U.L. 16 1 D SUFFIX SOIC CASE 751B-03 A1 - A4 B1-B4 C0 1 - 4 C4 Operand A Inputs Operand B Inputs Carry Input Sum Outputs (Note b) Carry Output (Note b) 1.0 U.L. 1.0 U.L. 0.5 U.L. 10 U.L. 10 U.L. ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC NOTES: a) 1 TTL Unit Load (U.L.) = 40 A 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. LOGIC SYMBOL 5 3 14 12 6 2 15 11 A1 A2 A3 A4 B1 B2 B3 B4 7 C0 1 2 3 4 4 1 13 10 C4 9 VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 5-1 SN54/74LS283 LOGIC DIAGRAM C0 7 A1 5 B1 6 A2 3 B2 2 A3 14 B3 15 A4 12 B4 11 C1 C2 C3 4 1 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS 2 1 3 13 4 10 9 C4 FUNCTIONAL DESCRIPTION The LS283 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 Example: C0 logic levels Active HIGH Active LOW L 0 1 A1 L 0 1 A2 H 1 0 A3 L 0 1 A4 H 1 0 B1 H 1 0 B2 L 0 1 Due to the symmetry of the binary add function the LS283 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. B3 L 0 1 B4 H 1 0 1 H 1 0 2 H 1 0 3 L 0 1 4 L 0 1 C4 H 1 0 (10+9=19) (carry+5+6=12) Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 7, 5 or 3. FAST AND LS TTL DATA 5-2 SN54/74LS283 FUNCTIONAL TRUTH TABLE C (n - 1) L L L L H H H H An L L H H L L H H Bn L H L H L H L H n L H H L H L L H Cn 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 VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 0.4 4.0 8.0 Unit V C mA mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 C0 Any A or B IIH Input HIGH Current C0 Any A or B IIL IOS ICC Input LOW Current C0 Any A or B Short Circuit Current (Note 1) Power Supply Current Total, Output HIGH Total, Output LOW - 20 0.1 0.2 - 0.4 - 0.8 - 100 34 39 0.35 0.5 20 40 V A A mA mA mA mA mA VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX VCC = MAX, VIN = 7.0 V 2.7 3.5 0.25 0.4 V V 2.5 - 0.65 3.5 0.8 - 1.5 V V Min 2.0 0.7 V Typ Max Unit V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VIN = 2.7 V mA Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. FAST AND LS TTL DATA 5-3 SN54/74LS283 AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay, C0 Input to Any Output Propagation Delay, Any A or B Input to Outputs Propagation Delay, C0 Input to C4 Output Propagation Delay, Any A or B Input to C4 Output Min Typ 16 15 15 15 11 11 11 12 Max 24 24 24 24 17 22 17 17 Unit ns ns CL = 15 pF Figures 1 & 2 ns ns Test Conditions AC WAVEFORMS 1.3 V tPLH 1.3 V VOUT tPHL VIN VOUT 1.3 V tPHL 1.3 V tPLH VIN Figure 1 Figure 2 FAST AND LS TTL DATA 5-4 |
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