onsemi

SN74LS688DW

SN74LS688DW Description

The SN74LS688DW is an 8-bit identity comparator from the 74LS series, manufactured by onsemi. This integrated circuit is designed to compare two 8-bit binary words and provide an output signal indicating whether the two words are identical. The SN74LS688DW operates within a supply voltage range of 4.85V to 5.25V and features an active low output, which asserts when the compared words are identical (A=B).

The device is housed in a surface-mount package, specifically a 20-lead small outline integrated circuit (SOIC) package, making it suitable for compact and high-density PCB designs. The operating temperature range of 0°C to 70°C ensures reliable performance in a variety of environmental conditions.

SN74LS688DW Features

• Operating Temperature: 0°C to 70°C, ensuring reliable operation in standard industrial environments.
• Max Propagation Delay: 23ns at 5V and 45pF, providing fast response times suitable for high-speed digital systems.
• Supply Voltage Range: 4.85V to 5.25V, ensuring compatibility with standard TTL logic levels.
• Output Function: Active low, indicating equality (A=B) when the compared words match.
• Number of Bits: 8-bit comparison capability, allowing for the comparison of two 8-bit binary words.
• Output Current: 400µA for high output and 24mA for low output, ensuring robust signal drive capabilities.
• Mounting Type: Surface mount, ideal for modern PCB designs that require compact and space-efficient components.
• Package: 20-lead SOIC, offering a small footprint and ease of integration into various electronic systems.

SN74LS688DW Applications

The SN74LS688DW is well-suited for a variety of applications where the comparison of binary words is required. Some specific use cases include:

• Data Processing Systems: Used in data processing applications to compare data words for error detection and correction.
• Memory Management: Ideal for memory systems where address comparison is necessary for data retrieval and storage.
• Digital Signal Processing: Useful in DSP systems for comparing signal values and making conditional decisions.
• Control Systems: Employed in control systems to compare input and output values for feedback and control logic.
• Communication Systems: Used in communication protocols for data integrity checks and synchronization.

Conclusion of SN74LS688DW

The SN74LS688DW is a versatile and reliable 8-bit identity comparator that offers fast response times and robust performance. Its active low output function and compatibility with standard TTL levels make it an ideal choice for a wide range of digital systems. Despite being marked as obsolete, the SN74LS688DW remains a valuable component for applications requiring high-speed, accurate binary word comparison. Its compact surface-mount package and wide operating temperature range further enhance its suitability for modern electronic designs. For engineers and designers looking for a reliable comparator solution, the SN74LS688DW is a proven choice that delivers consistent performance in various industrial and commercial applications.