SN74LS283 4-Bit Binary Full Adder with Fast Carry The SN74LS283 is a high-speed 4-Bit Binary Full Adder with internal carry lookahead. It accepts two 4-bit binary words (A1 – A4, B1 – 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). http://onsemi.com LOW POWER SCHOTTKY GUARANTEED OPERATING RANGES Symbol VCC Parameter Supply Voltage Min Typ Max Unit 4.75 5.0 5.25 V 0 25 70 °C TA Operating Ambient Temperature Range IOH Output Current – High – 0.4 mA IOL Output Current – Low 8.0 mA 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Semiconductor Components Industries, LLC, 1999 December, 1999 – Rev. 6 1 Device Package Shipping SN74LS283N 16 Pin DIP 2000 Units/Box SN74LS283D 16 Pin 2500/Tape & Reel Publication Order Number: SN74LS283/D SN74LS283 CONNECTION DIAGRAM DIP (TOP VIEW) VCC B3 A3 Σ3 A4 B4 Σ4 C4 16 15 14 13 12 11 10 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 Σ2 2 B2 3 A2 4 Σ1 5 A1 6 B1 7 C0 8 GND LOADING (Note a) PIN NAMES A1 – A4 B1 – B4 C0 S1 – S4 C4 Operand A Inputs Operand B Inputs Carry Input Sum Outputs Carry Output 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 U.L. 5 U.L. NOTES: a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW. LOGIC SYMBOL 5 3 14 12 6 2 15 11 A1 A2 A3 A4 B1 B2 B3 B4 7 C4 C0 ∑1 ∑2 ∑3 ∑4 4 1 13 10 VCC = PIN 16 GND = PIN 8 http://onsemi.com 2 9 SN74LS283 LOGIC DIAGRAM C0 A1 7 B1 A2 6 5 B2 A3 2 3 C1 4 ∑1 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS B3 A4 15 14 C2 ∑2 11 C3 10 13 1 B4 12 ∑3 9 ∑4 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. 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. C0 + (A1 + B1) + 2(A2 + B2) + 4(A3 + B3) + 8(A4 + B4) = ∑1 + 2 ∑2 + 4 ∑3 + 8 ∑4 + 16C4 Where: (+) = plus 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 7, 5 or 3. http://onsemi.com 3 SN74LS283 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 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL O Output LOW Voltage IIH Max 2.0 0.8 – 0.65 2.7 – 1.5 3.5 Unit Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = – 18 mA V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table 0.25 0.4 V IOL = 4.0 mA 0.35 0.5 V IOL = 8.0 mA C0 20 µA Any A or B 40 µA C0 0.1 mA Any A or B 0.2 mA C0 – 0.4 mA Any A or B – 0.8 mA – 100 mA VCC = MAX Power Supply Current Total, Output HIGH 34 mA VCC = MAX Total, Output LOW 39 Input HIGH Current IIL Input LOW Current IOS Short Circuit Current (Note 1) ICC Typ – 20 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. http://onsemi.com 4 VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, MAX VIN = 2 2.7 7V VCC = MAX, MAX VIN = 7 7.0 0V MAX VIN = 0 4V VCC = MAX, 0.4 SN74LS283 AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Limits Typ Max Unit tPLH tPHL Symbol Propagation Delay, C0 Input to Any Σ Output Parameter 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 11 17 22 ns tPLH tPHL Propagation Delay, Any A or B Input to C4 Output 11 12 17 17 ns Min Test Conditions CL = 15 pF Figures 1 & 2 AC WAVEFORMS VIN 1.3 V VIN tPHL VOUT tPLH 1.3 V tPLH 1.3 V 1.3 V VOUT Figure 1. Figure 2. http://onsemi.com 5 tPHL SN74LS283 PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. –A– 16 9 1 8 B F C L S –T– SEATING PLANE K H G D M J 16 PL 0.25 (0.010) M T A M http://onsemi.com 6 DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01 SN74LS283 PACKAGE DIMENSIONS D SUFFIX PLASTIC SOIC PACKAGE CASE 751B–05 ISSUE J –A– 16 9 1 8 –B– P NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 8 PL 0.25 (0.010) M B S G R K F X 45 _ C –T– SEATING PLANE J M D 16 PL 0.25 (0.010) M T B S A S http://onsemi.com 7 DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019 SN74LS283 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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