74LS283 4-bit Binary Full Add with Fast Carry


The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS283 full adders perform the addition of two 4-bit binary words. The sum (2) outputs are provided for each bit and the resultant carry (C4) is obtained from the fourth bit.

74LS283 Features

  • Full Added Performs Addition of Two 4-bit Binary Numbers
  • Full Carry Look Ahead across the 4-bits
  • Fast Add Times
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS283 Specifications

Supply Voltage4.75 – 5.25Vdc
Maximum Clock Frequency40Mhz
Power Dissipation2mW/gate @100kHz
Minimum Output Current8mA
Propagation Delay10nS
Fan Out (TTL Loads)20

74LS283 Pinout Diagram

74LS283 Pin Description

Pin NoPin NameDescription
1Σ2Sum Output
2B2Operand B Input
3A2Operand A Input
4Σ1Sum Output
5A1Operand A Input
6B1Operand B Input
7C0Carry Input
9C4Resultant Carry Output
10Σ4Sum Output
11B4Operand B Input
12A4Operand A Input
13Σ3Sum Output
14A3Operand A Input
15B3Operand B Input
16VCCPositive Supply


  • A Full Adder’s circuit can be used as a part of many other larger circuits like Ripple Carry Adder, which adds n-bits simultaneously.
  • The dedicated multiplication circuit uses Full Adder’s circuit to perform Carryout Multiplication.
  • Full Adders are used in ALU- Arithmetic Logic Unit.

74LS283 Alternative Equivalent

Download 74LS283 4-bit Binary Full Add with Fast Carry Datasheet from the link given below.