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SN74LS283 Dataheets PDF



Part Number SN74LS283
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description 4-Bit Binary Full Adder
Datasheet SN74LS283 DatasheetSN74LS283 Datasheet (PDF)

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). GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA .

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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). GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA Operating Ambient Temperature Range 4.75 5.0 5.25 V 0 25 70 °C IOH Output Current − High IOL Output Current − Low −0.4 mA 8.0 mA http://onsemi.com LOW POWER SCHOTTKY 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B © Semiconductor Components Industries, LLC, 2006 July, 2006 − Rev. 8 16 1 SOEIAJ M SUFFIX CASE 966 ORDERING INFORMATION Device Package Shipping SN74LS283N 16 Pin DIP 2000 Units/Box SN74LS283D SOIC−16 38 Units/Rail SN74LS283DR2 SOIC−16 2500/Tape & Reel SN74LS283M SOEIAJ−16 See Note 1 SN74LS283MEL SOEIAJ−16 See Note 1 1. For ordering information on the EIAJ version of the SOIC package, please contact your local ON Semiconductor representative. 1 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 2 3 4 56 78 Σ2 B2 A2 Σ1 A1 B1 C0 GND PIN NAMES A1 − A4 B1 − B4 C0 S1 − S4 C4 Operand A Inputs Operand B Inputs Carry Input Sum Outputs Carry Output LOADING (Note a) 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 C0 C4 9 ∑1 ∑2 ∑3 ∑4 4 1 13 10 VCC = PIN 16 GND = PIN 8 http://onsemi.com 2 C0 A1 7 5 B1 6 A2 3 B2 2 SN74LS283 LOGIC DIAGRAM A3 14 B3 15 A4 12 B4 11 C1 C2 C3 4 VCC = PIN 16 GND = PIN 8 ∑1 = PIN NUMBERS 1 ∑2 13 ∑3 10 ∑4 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 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. Example: logic levels Active HIGH Active LOW C0 A1 A2 A3 A4 B1 B2 B3 B4 ∑1 ∑2 ∑3 ∑4 C4 L LHL HHL LHHH L LH 0010 11001 1 1 0 01 1101 00110 0 0 1 10 (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. http://onsemi.com 3 SN74LS283 FUNCTIONAL TRUTH TABLE C (n −1) An Bn ∑n Cn L L L L L L L H H L L H L H L L H H L H H L L H L H L H L H H H L L H H H 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 VIH Parameter Input HIGH Voltage Min Typ Max Unit Test Conditions 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 0.8 V Guaranteed Input LOW Voltage for All Inputs VIK Input Clamp Diode Voltage −0.65 −1.5 V VCC = MIN, IIN = − 18 mA VOH Output HIGH Voltage 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VOL Output LOW Voltage 0.25 0.4 0.35 0.5 V IOL = 4.0 mA V IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table C0 Any A or B IIH Input HIGH Current C0 Any A or B 20 μA 40 μA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V 0.2 mA C0 IIL Input LOW Current Any A or B −0.4 mA VCC = MAX, VIN = 0.4 V −0.8 mA IOS Short Circuit Current (Note 1) − 20 −100 mA Power Supply Current ICC Total, Output HIGH Total, Output LOW 34 mA 39 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. VCC = MAX VCC = MAX http://onsemi.com 4 SN74LS283 AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Limits Symbol Parameter Min Typ Max Unit tPLH Propagation Delay, C0 Input tPHL to Any Σ Output 16 15 24 24 ns tPLH Propagation Delay, Any A or B Input tPHL to Σ Outputs 15 15 24 24 ns tPLH Propagation Delay, C0 Input tPHL to C4 Output 11 11 17 22 ns tPLH Propagation Delay, Any A or B Input tPHL to C4 Output 11 12 17 17 ns Test Conditions CL = 15 pF Figures 1 & 2 VIN VOUT 1.3 V tPHL 1.3 V Figure 1. AC WAVEFORMS VIN 1.3 V tPLH tPLH tPHL.


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