74266 Quad 2-Input XNOR Gate - Technical Summary

Overview

The 74266 is a high-speed Quad 2-Input XNOR (Exclusive-NOR) gate integrated circuit (IC) belonging to the 7400 series of TTL (Transistor-Transistor Logic) devices. This component is designed to perform logical XNOR operations on two input signals per gate, with four independent gates integrated into a single package. The 74266 is widely used in digital systems for arithmetic operations, error detection, and data comparison due to its reliable performance and compatibility with standard TTL logic levels.

This IC is particularly valued for its high-speed operation, making it suitable for applications requiring rapid signal processing. The 74266 is constructed using advanced semiconductor technology, ensuring low power dissipation while maintaining robust noise immunity and stable operation across a wide range of environmental conditions.

Features

• Quad 2-Input XNOR Gates: Contains four independent XNOR gates in a single package, optimizing board space and design efficiency.
• High-Speed Operation: Typical propagation delay of 10 ns, making it ideal for high-frequency digital applications.
• TTL-Compatible Inputs and Outputs: Ensures seamless integration with other TTL logic family components.
• Wide Operating Voltage Range: Operates reliably at standard TTL voltage levels (4.75V to 5.25V).
• Low Power Consumption: Designed for energy-efficient performance, with typical power dissipation of 10 mW per gate.
• High Noise Immunity: Robust design minimizes susceptibility to electrical noise, ensuring signal integrity.
• Standard 14-Pin Package: Available in PDIP, SOIC, and other industry-standard packages for versatile mounting options.

Applications

The 74266 is a versatile component used in a wide range of digital and computing applications, including:

• Arithmetic Logic Units (ALUs): Performs equality checks and binary addition operations in processors and calculators.
• Error Detection Circuits: Used in parity checkers and comparators to verify data integrity.
• Data Processing Systems: Facilitates signal comparison and conditional logic in microcontrollers and FPGAs.
• Communication Systems: Employed in encoders, decoders, and signal conditioning circuits.
• Control Systems: Implements decision-making logic in industrial automation and robotics.
• Educational and Prototyping Projects: Ideal for teaching digital logic fundamentals and breadboard experiments.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (Vcc): 7V
• Input Voltage (Vin): 5.5V
• Operating Temperature Range: 0°C to 70°C (Commercial Grade)
• Storage Temperature Range: -65°C to 150°C

Recommended Operating Conditions

• Supply Voltage (Vcc): 4.75V to 5.25V
• High-Level Input Voltage (Vih): 2V (min)
• Low-Level Input Voltage (Vil): 0.8V (max)
• Output Current (Ioh/Iol): ±8 mA (max)

Switching Characteristics

• Propagation Delay (tpd): 10 ns (typical) at Vcc = 5V, TA = 25°C
• Rise Time (tr): 6 ns (typical)
• Fall Time (tf): 6 ns (typical)

Package Information

The 74266 is available in multiple package options to accommodate different assembly and space requirements:

• PDIP-14 (Plastic Dual In-Line Package):
  • Dimensions: 19.3 mm x 6.35 mm
  • Pin Spacing: 2.54 mm
  • Mounting Style: Through-hole
• SOIC-14 (Small Outline Integrated Circuit):
  • Dimensions: 8.65 mm x 3.9 mm
  • Pin Spacing: 1.27 mm
  • Mounting Style: Surface-mount
• TSSOP-14 (Thin Shrink Small Outline Package):
  • Dimensions: 5 mm x 4.4 mm
  • Pin Spacing: 0.65 mm
  • Mounting Style: Surface-mount

Pin Configuration

The 74266 follows a standard 14-pin layout with the following pinout:

• Pin 1: Input A1 (Gate 1)
• Pin 2: Input B1 (Gate 1)
• Pin 3: Output Y1 (Gate 1)
• Pin 4: Input A2 (Gate 2)
• Pin 5: Input B2 (Gate 2)
• Pin 6: Output Y2 (Gate 2)
• Pin 7: Ground (GND)
• Pin 8: Output Y3 (Gate 3)
• Pin 9: Input B3 (Gate 3)
• Pin 10: Input A3 (Gate 3)
• Pin 11: Output Y4 (Gate 4)
• Pin 12: Input B4 (Gate 4)
• Pin 13: Input A4 (Gate 4)
• Pin 14: Supply Voltage (Vcc)

Conclusion

The 74266 Quad 2-Input XNOR Gate is a reliable and high-performance component for digital logic applications. Its combination of speed, low power consumption, and compatibility with standard TTL logic makes it a preferred choice for engineers and hobbyists alike. Whether used in complex computing systems or simple educational projects, the 74266 delivers consistent and accurate logical operations, ensuring efficient and error-free performance.