SN74ALS688NSR

Comparators Overview

The SN74ALS688NSR is an 8-bit identity comparator from Texas Instruments' ALS logic family, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum propagation delay of 20 ns. The device features active-low outputs with a low-level output current capability of 24 mA and a high-level output current of -2.6 mA. Designed for surface-mount installation, it functions reliably across an operating temperature range of 0°C to +70°C.

Comparators Feature Summary

• Performs 8-bit magnitude comparison to determine equality between two binary inputs
• Provides active-low output signaling when input values are identical
• Utilizes Schottky-clamped ALS technology for enhanced switching speed

Comparators Applications

• Digital data validation circuits requiring byte-level equality checks
• Address decoding systems in microprocessor-based architectures
• Error detection logic in digital communication interfaces

Comparators Procurement Notes

Verify the specific suffix 'SR' indicates tape-and-reel packaging configuration distinct from tube variants. Confirm the manufacturer designation as Texas Instruments to ensure component authenticity. Cross-reference the datasheet revision date against production lot codes to validate technical specifications. Ensure compliance with RoHS directives if required by the target assembly process.

Comparators Selection Notes

Select this component when an 8-bit identity comparison function is required in surface-mount designs. The ALS series offers a balance of speed and power consumption suitable for general-purpose digital logic. Consider the 20-pin SOIC footprint for PCB layout compatibility. Verify that the active-low output polarity aligns with downstream gate requirements without additional inversion stages.

Comparators Part Context

This part belongs to the SN74ALS688 family of 8-bit identity comparators. It serves as the surface-mount equivalent to through-hole variants like the SN74ALS688N. The device integrates eight independent comparison channels into a single integrated circuit, providing a compact solution for parallel data verification tasks in standard 5V logic environments.

Comparators Replacement Considerations

The SN74ALS688DR is a documented pin-compatible alternative from Texas Instruments offering the same functional specifications in a different SOIC package width.