SN54/74LS283 4-BIT BINARY FULL ADDER WITH FAST CARRY

1 5-1 FAST AND LS TTL DATA4-BIT BINARY FULL ADDERWITH FAST CARRYThe SN54 / 74ls283 is a high-speed 4-BIT BINARY Full ADDER with internalcarry lookahead. It accepts two 4-BIT BINARY words (A1 A4, B1 B4) and aCarry Input (C0). It generates the BINARY Sum outputs ( 1 4) and the CarryOutput (C4) from the most significant bit. The LS283 operates with either ac-tive HIGH or active LOW operands (positive or negative logic).14131211109123456716158 VCC 2B3A3 3A4 4B4C4B2A2 1A1B1C0 GNDCONNECTION DIAGRAM DIP (TOP VIEW)NOTE:The Flatpak versionhas the same pinouts(Connection Diagram) asthe Dual In-Line NAMESLOADING (Note a)HIGHLOWA1 A4 Operand A B4 Operand B 1 4 Sum Outputs (Note b)10 ( ) Output (Note b)10 ( ).

2 A) 1 TTL Unit Load ( ) = 40 A mA ) The Output LOW drive factor is for Military (54) and 5 for Commercial(74) Temperature BINARY FULL ADDERWITH FAST CARRYLOW POWER SCHOTTKYORDERING INFORMATIONSN54 LSXXXJC eramicSN74 LSXXXNP lasticSN74 LSXXXDSOICJ SUFFIXCERAMICCASE 620-09N SUFFIXPLASTICCASE 648-08161161161D SUFFIXSOICCASE 751B-03 LOGIC SYMBOL53 14 12 6 2 15 119741 13 10A1A2A3A4B1B2B3B4 1 2 3 4 VCC = PIN 16 GND = PIN 8C0C45-2 FAST AND LS TTL DATASN54/ 74ls283 LOGIC DIAGRAMC0A1B1A2B2A3B3A4B4 1 2 3 4C4 VCC = PIN 16 GND = PIN 8 = PIN NUMBERSC1C2C314126734591112101315 FUNCTIONAL DESCRIPTIONThe LS283 adds two 4-BIT BINARY words (A plus B)

3 Plus theincoming CARRY . The BINARY sum appears on the sum outputs( 1 4) and outgoing CARRY (C4) + (A1 + B1) + 2(A2 + B2) + 4(A3 + B3) + 8(A4 + B4) = 1 + 2 2+ 4 3 + 8 4 + 16C4 Where: (+) = plusDue to the symmetry of the BINARY add function the LS283can 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 Inputcan not be left open, but must be held LOW when no CARRY in :C0A1A2A3A4B1B2B3B4 1 2 3 4C4logic levelsLLHLHHLLHHHLLHA ctive HIGH00101100111001(10+9=19)Active LOW11010011000110( CARRY +5+6=12)Interchan ging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 7, 5 or AND LS TTL DATASN54/ 74ls283 FUNCTIONAL TRUTH TABLEC (n 1)

4 AnBn nCnLLLLLLLHHLLHLHLLHHLHHLLHLHLHLHHHLLHHH HHHC1 C3 are generated internallyC0 is an external inputC4 is an output generated internallyGUARANTEED OPERATING RANGESS ymbolParameterMinTypMaxUnitVCCS upply Ambient Temperature Range5474 550252512570 CIOHO utput Current High54, 74 Current CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)SblPLimitsUiTCdi iSymbolParameterMinTypMaxUnitTest ConditionsVIHI nput HIGH Input HIGH Voltage forAll InputsVILI nput LOW Input LOW Voltage forVILI nput LOW InputsVIKI nput Clamp Diode Voltage = MIN, IIN = 18 mAVOHO utput HIGH = MIN, IOH = MAX, VIN = VIHVOHO utput HIGH ,OH,INIHor VIL per Truth TableVOLO utput LOW Voltage54, = mAVCC = VCC MIN,VIN=VILor VIHVOLO utput LOW = mAVIN = VIL or VIHper Truth TableIIHIGH CC020 AVCC= MAX VIN=27 VIIHI nput HIGH CurrentAny A or B40 AVCC = MAX, VIN = VIIHI nput HIGH MAX VIN=70 VAny A or = MAX.

5 VIN = VIILI nput LOW CurrentC0 MAX VIN=04 VIILI nput LOW CurrentAny A or B = MAX, VIN = VIOSS hort Circuit Current (Note 1) 20 100mAVCC = MAXICCP ower Supply CurrentTotal, Output HIGH34mAVCC = MAXCCT otal, Output LOW39 CCNote 1: Not more than one output should be shorted at a time, nor for more than 1 AND LS TTL DATASN54/74LS283AC CHARACTERISTICS (TA = 25 C, VCC = V)SblPLimitsUiTCdi iSymbolParameterMinTypMaxUnitTest ConditionstPLHtPHLP ropagation Delay, C0 Inputto Any Output16152424nsC15 FtPLHtPHLP ropagation Delay, Any A or B Inputto Outputs15152424nsCL = 15 pFtPLHtPHLP ropagation Delay, C0 Inputto C4 Output11111722nsLpFigures 1 & 2tPLHtPHLP ropagation Delay, Any A or B Inputto C4 Output11121717nsFigure 1 Figure VVINVOUTtPHLtPLHtPLHtPHLAC WAVEFORMS