SN74ALS280DR

Overview

The SN74ALS280DR is a universal 9-bit parity generator/checker from the Texas Instruments 74ALS series. It features advanced Schottky circuitry and provides both odd (Σ ODD) and even (Σ EVEN) outputs for flexible system integration. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C. It utilizes a 14-pin Small-Outline (D) package.

Feature Summary

• Generates or checks parity for nine data lines with dedicated odd and even output terminals
• Cascadable architecture allows expansion for n-bit parity applications up to 81 bits
• Compatible with existing MSI parity circuits, enabling direct substitution in legacy designs

Applications

• Parity generation and checking for 9-bit data lines
• System upgrades replacing SN74ALS180 and SN74AS180 parity generators/checkers
• Implementation of extended word-length parity systems via cascading

Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the plastic small-outline (D) package configuration. Confirm that the component meets RoHS3 specifications as indicated in distributor records. Ensure the procurement channel sources parts consistent with the manufacturer's current production status and packaging standards.

Selection Notes

Select this component when designing systems requiring 9-bit parity handling with high-performance Schottky logic. It is suitable for upgrading older architectures utilizing SN74ALS180 or SN74AS180 devices without redesigning input connections. Consider its cascadability if larger bit-widths are required.

Part Context

This part belongs to the Texas Instruments 74ALS logic family, known for advanced Schottky performance. It functions as a universal parity generator/checker, distinct from standard logic gates by providing simultaneous odd and even parity results. The DR suffix indicates surface-mount packaging.

Replacement Considerations

SN74ALS280N

FAQ

How does the SN74ALS280 handle parity expansion?

The device can be cascaded to implement parity for word lengths up to 81 bits.

What is the relationship between the SN74ALS280 and SN74ALS180?

The SN74ALS280 can substitute for the SN74ALS180 in existing designs to produce an identical function, despite lacking internal expander inputs.