74LS626N

Overview

The SN74LS626N is a high-speed silicon-gate LS TTL identity comparator manufactured by Rochester Electronics. It features 16-bit parallel comparison with inverted outputs, indicating equality when all input bits match. The device utilizes a 20-pin plastic dual in-line package (PDIP) with a standard 0.300-inch width. Designed for commercial temperature ranges up to 70°C, it operates within standard TTL voltage levels. Key specifications include fuse-programmable inputs for customization and a single functional block architecture. The component belongs to the ALS/LS logic family, providing reliable digital signal processing for data validation tasks.

Feature Summary

• 16-bit parallel identity comparison with inverted output
• Fuse-programmable inputs for configuration flexibility
• Commercial temperature range operation up to 70°C
• 20-pin PDIP plastic package

Applications

• Digital data bus validation
• Memory address matching circuits
• Parallel data integrity verification

Procurement Notes

Verify lead times and authenticity through authorized distributors. Confirm RoHS compliance status as listings indicate non-compliance. Check for obsolete status or alternative sourcing options given the component's age. Ensure packaging matches the specified DIP-20 form factor for board compatibility.

Selection Notes

Select this component for applications requiring 16-bit equality checking in TTL environments. Consider the inverted output polarity when designing downstream logic. Verify thermal requirements against the 70°C maximum operating limit. Evaluate pin count constraints against the 20-pin DIP footprint.

Part Context

This part is part of the broader 74LS series of logic integrated circuits, widely used in legacy digital systems. Rochester Electronics often supplies recycled or surplus versions of these components. The specific 'N' suffix denotes the plastic DIP package variant. It serves as a specialized comparator within the general-purpose logic IC landscape.

Replacement Considerations

Direct pin-compatible replacements may be limited due to the specific 16-bit identity function. Generic comparators might require additional logic gates. Verify electrical characteristics such as propagation delay and output drive capability before substituting with other 74LS family parts.