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SN74LS283N

4-bit binary full adder, fast carry, LS TTL, PDIP-16

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Manufacturer Part：

SN74LS283N

Package：

PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

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Description

Product Overview

The SN74LS283N from Texas Instruments is a 4-bit binary full adder with fast carry, performing 4-bit addition in a single 24ns cycle in a 16-pin PDIP package.

Key Specifications

Function 4-bit binary full adder with fast carry
Logic Family LS (Low-power Schottky)
Supply Voltage 4.75V to 5.25V (5V nominal)
Addition Time 24ns typical (16-bit using 4 cascaded chips)
Operating Temperature 0°C to +70°C
Package PDIP-16 (19.3 x 6.35mm)

Features

  • 4-bit parallel addition in one IC
  • Internal fast carry lookahead
  • Cascadable for wider additions
  • C0 input for multi-byte arithmetic
  • C4 output for carry propagation

Applications

  • Arithmetic logic unit (ALU)
  • Address calculation
  • Digital signal processing
  • Binary counter/multiplier building block

The SN74LS283N from Texas Instruments is a 4-bit binary full adder that adds two 4-bit numbers (A0-A3 and B0-B3) plus a carry-in (C0) and produces a 4-bit sum (Σ0-Σ3) plus a carry-out (C4). The internal fast carry lookahead generates the C4 output without waiting for the carry to ripple through all four stages, making the 4-bit addition time only 24ns. For wider additions, the C4 output of one 74283 connects to the C0 input of the next, creating an 8-bit adder with two chips, or a 16-bit adder with four chips. The 74283 is the building block of arithmetic logic units (ALUs) in simple processors and digital signal processing systems. The N suffix denotes the PDIP-16 through-hole package.

The SN74LS283N adds A[3:0] + B[3:0] + C0 and outputs Σ[3:0] + C4. Internally, it uses carry lookahead logic: instead of computing each bit’s carry sequentially (ripple carry), it generates all carries simultaneously using the generate (G) and propagate (P) signals. Gi = Ai AND Bi (stage i generates a carry); Pi = Ai XOR Bi (stage i propagates an incoming carry). The carry at each stage is: Ci+1 = Gi OR (Pi AND Ci). For a 4-bit adder: C1 = G0 + P0·C0, C2 = G1 + P1·G0 + P1·P0·C0, C3 = G2 + P2·G1 + P2·P1·G0 + P2·P1·P0·C0, C4 = G3 + P3·G2 + P3·P2·G1 + P3·P2·P1·G0 + P3·P2·P1·P0·C0. This reduces the carry propagation from 4 gate delays (ripple) to 2 gate delays (lookahead), enabling the 24ns total addition time. The sum at each bit is: Σi = Pi XOR Ci. For subtraction (A−B), complement B and add 1 (set C0=1): A − B = A + NOT(B) + 1.

Pin Name Type Description
1 C0 Input Carry input (from lower-order adder or 0/1)
2 Σ1 Output Sum bit 1 (2^1)
3 A1 Input Input A bit 1
4 B1 Input Input B bit 1
5 A2 Input Input A bit 2
6 B2 Input Input B bit 2
7 VCC Power Supply (5V)
8 Σ3 Output Sum bit 3 (2^3)
9 Σ4 Output Sum bit 4 (2^4, or C4 in some pinouts)
10 A4 Input Input A bit 4 (MSB)
11 B4 Input Input B bit 4 (MSB)
12 Σ2 Output Sum bit 2 (2^2)
13 A3 Input Input A bit 3
14 B3 Input Input B bit 3
15 Σ0 Output Sum bit 0 (LSB)
16 GND Power Ground
  • 4-Bit Adder: Two 4-bit inputs A[3:0] and B[3:0]; C0=0; output Σ[3:0] + C4; 0+0=0 to 15+15=30 (C4=1, Σ=14)
  • 8-Bit Adder: Two 74283 chips; low chip C4 → high chip C0; adds 8-bit numbers in ~50ns
  • Subtractor: A − B: connect B inputs through inverters (74LS04); set C0=1; result = A + NOT(B) + 1 = A − B
  • Incrementer: Set B=0001 and C0=0; result = A + 1; useful for program counters
Model Manufacturer Key Difference Package Supply
74LS283N TI/Nexperia Original TTL version with 5V-only supply, typical propagation delay 10-15ns DIP-16 5V TTL
74LS283D TI/Nexperia Surface-mount SOIC version of LS with identical logic function SOIC-16 5V TTL
74HC283D TI/Nexperia CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity SOIC-16 2-6V CMOS
74HC283N TI/Nexperia Through-hole DIP version of HC family for prototyping and repair DIP-16 2-6V CMOS
74HCT283D TI/Nexperia CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V SOIC-16 4.5-5.5V TTL-in
74HCT283N TI/Nexperia Through-hole DIP version of HCT family for prototyping and repair DIP-16 4.5-5.5V TTL-in

The 74283 is a 4-Bit Binary Full Adder. Family variants span from the original LS TTL (5V only) to modern LVC/AUP (down to 0.8V). HC and HCT versions offer 2-6V CMOS operation with HCT providing TTL-compatible input thresholds for mixed 5V systems. CD4000-series equivalents offer the widest 3-18V supply range at the cost of lower switching speed. DIP packages (N suffix) are through-hole; SOIC (D suffix) and TSSOP are surface-mount.

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