SN74ALS280N3

Overview

The SN74ALS280N3 is a universal 9-bit parity generator/checker from the Texas Instruments ALS logic series. It features advanced Schottky circuitry and provides complementary Σ EVEN and Σ ODD outputs to support both odd- and even-parity applications. 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. Propagation delays are specified between 3 ns and 22 ns depending on the input-to-output path. It utilizes a standard plastic 14-pin DIP package.

Feature Summary

• Generates or checks parity for nine data lines with complementary outputs
• Cascadable architecture allows expansion for n-bit parity applications
• Compatible replacement for legacy MSI parity circuits without expander inputs

Applications

• System upgrades involving existing SN74ALS180 or SN74AS180 designs
• Implementation of 25-line or 81-line parity generation and checking
• Data integrity verification in digital communication systems

Procurement Notes

Verify that the specific ordering suffix 'N3' corresponds to the standard PDIP-14 package configuration documented in official Texas Instruments datasheets. Confirm RoHS compliance status and lead finish specifications directly with the manufacturer, as packaging materials and environmental certifications may vary by production lot and region.

Selection Notes

Select this component when upgrading legacy systems requiring 9-bit parity functionality. Ensure the design accommodates the specific propagation delay characteristics of the ALS family. Verify that the application requires complementary outputs for both even and odd parity states simultaneously.

Part Context

This device belongs to the Texas Instruments SN74ALS280 family of parity generators/checkers. It is designed to replace older SN74ALS180 and SN74AS180 devices in existing designs by utilizing terminal 4 as an input and leaving terminal 3 unconnected internally.

Replacement Considerations

SN74ALS280N

FAQ

How does the SN74ALS280N3 handle cascading for word lengths exceeding 9 bits?

The device supports cascading to implement longer word lengths up to 81 bits. This is achieved by connecting the outputs of multiple units, potentially using exclusive-OR gates for specific configurations like 18- or 27-line parity.

What is the function of terminal 3 on the SN74ALS280N3?

Terminal 3 has no internal connection. In the context of replacing SN74ALS180/AS180 devices, this lack of internal connection, combined with the use of terminal 4 as an input, facilitates identical functionality without expander inputs.