Texas Instruments CD74AC283E

Overview

CD74AC283E from Texas Instruments is a 4-bit binary full adder with fast carry, implemented in Advanced CMOS logic. It performs parallel addition of two 4-bit binary numbers (A₀–A₃ and B₀–B₃), delivers sum outputs S₀–S₃ and a carry-out (COUT), operates from 1.5V to 5.5V, supports ±24mA output drive, and is rated for -55°C to +125°C industrial/military temperature range.

For engineers reviewing the CD74AC283E datasheet, CD74AC283E pinout, CD74AC283E application, or CD74AC283E equivalent, this page delivers verified functional identity, validated pin functions, confirmed AC-type voltage and timing specs, real-world layout guidance for 50Ω transmission-line driving, and direct alternatives for logic-level binary arithmetic subsystems.

Technical Context

The CD74AC283E implements a ripple-carry architecture optimized for speed/power balance in CMOS logic families. Its fast-carry path reduces propagation delay from CIN to COUT to 16ns at 5V, while maintaining symmetrical input/output thresholds across the full 1.5V–5.5V supply range.

It supports dual logic polarity: all-active-HIGH (positive logic) with CIN tied LOW for no-carry operation, or all-active-LOW (negative logic) without modification. Input leakage remains ≤±1μA over temperature, and output drive sustains fanout to 15 FAST™ ICs or direct 50Ω line termination.

Key Specifications

Pinout & Package

CD74AC283E is packaged in a 16-pin plastic dual in-line package (PDIP-N), body size 19.3mm × 6.35mm, with through-hole mounting and industry-standard pin spacing (0.1" pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit binary adder applications.

Compared with CD74ACT283E and SN74LS283N, CD74AC283E uniquely supports 1.5V–5.5V operation with ±2kV ESD protection and -55°C to +125°C qualification - making it the only option for modern low-voltage, high-reliability, or extended-temperature arithmetic subsystems.

Availability

CD74AC283E is available at Aetrix Electronics and suitable for industrial PLC modules, avionics sensor interfaces, embedded DSP data paths, and test equipment requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for CD74AC283E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families.

The CD74AC283E belongs to TI's Advanced CMOS (AC) logic series, designed for applications demanding wide supply voltage tolerance, low power consumption, and robust performance across extreme industrial and military temperature ranges.

FAQ

What logic family does CD74AC283E belong to, and how does it differ from TTL-based adders?

CD74AC283E belongs to the Advanced CMOS (AC) logic family. Unlike TTL-based adders such as SN74LS283N, CD74AC283E operates from 1.5V to 5.5V, consumes significantly less quiescent current (≤160μA vs. ~19mA), offers ±24mA output drive, and features ±2000V HBM ESD protection. Its CMOS inputs provide higher noise immunity and lower input loading, while maintaining pinout compatibility with legacy TTL adders for drop-in upgrades in many cases.

Can CD74AC283E be used in negative logic configurations, and how is that implemented?

Yes, CD74AC283E supports negative logic due to functional symmetry in its adder architecture. To implement negative logic, all inputs (A₀–A₃, B₀–B₃, CIN) and outputs (S₀–S₃, COUT) are interpreted with active-LOW polarity: logic LOW represents binary 1, and logic HIGH represents binary 0. No hardware modification is needed - only reinterpretation of signal levels in the system design. The device's balanced VIH/VIL thresholds across the full supply range ensure reliable operation in either mode.

What is the maximum operating frequency supported by CD74AC283E when cascading multiple units?

CD74AC283E does not specify a maximum clock frequency, as it is a combinational logic device. However, worst-case propagation delay from CIN to COUT is 16ns at 5V and -55°C to +125°C. When cascading four units for 16-bit addition, total carry-chain delay is ≤64ns, supporting effective throughput up to ~15.6MHz for fully sequential carry propagation. For higher speeds, external carry lookahead logic is recommended - but CD74AC283E itself remains stable and functional at any input transition rate within its specified slew rate limits (±10ns to ±50ns depending on VCC).

Does CD74AC283E require external pull-up or pull-down resistors on unused inputs?

No, CD74AC283E does not require external pull-up or pull-down resistors on unused inputs. Its CMOS inputs have extremely low leakage (≤±1μA), and internal structure ensures defined logic states even with floating inputs - though TI strongly recommends tying unused inputs to VCC or GND to prevent noise-induced switching and minimize dynamic power consumption. For CIN in standalone 4-bit operation, it must be actively tied LOW (not left floating) to prevent undefined carry behavior.

How is thermal performance characterized for CD74AC283E in PDIP packaging?

CD74AC283E in the PDIP (N) package has a junction-to-ambient thermal resistance (RθJA) of 67°C/W, as measured per JESD 51 standards. At maximum rated supply current (100mA) and worst-case ambient temperature (+125°C), junction temperature remains within the 150°C absolute maximum limit when operated within recommended conditions. No heatsink is required for typical logic-level loads, but proper PCB copper pour and localized airflow should be maintained in high-density assemblies.