SN74AS280D

Overview

The SN74AS280D is a universal 9-bit parity generator and checker utilizing advanced Schottky high-performance circuitry. It provides complementary odd (Σ ODD) and even (Σ EVEN) outputs to support both parity schemes. The device features buffered inputs to reduce drive requirements and allows for cascading to expand word-length capability up to 81 bits. It operates within a supply voltage range of 4.5 V to 5.5 V and an operating temperature range of 0°C to 70°C.

Feature Summary

• Generates or checks parity for nine data lines with dedicated odd and even outputs
• Cascadable architecture enables expansion for n-bit parity applications
• Buffered inputs lower the drive requirements for connected logic sources

Applications

• Upgrading existing systems using MSI parity circuits
• Implementing 25-line parity generator/checker configurations
• Constructing 81-line parity generator/checker arrays

Procurement Notes

Verify that the specific package variant matches the required board layout, as the SN74AS280 family includes Plastic Small-Outline (D) packages and Standard Plastic (N) 300-mil DIPs. Confirm RoHS compliance status and lead finish specifications against current environmental declarations before finalizing procurement orders.

Selection Notes

Select this component when upgrading from SN74ALS180 or SN74AS180 devices while maintaining identical functionality without expander inputs. Ensure the design accommodates the specific output current capabilities and propagation delay characteristics inherent to the AS logic series compared to other families.

Part Context

This device belongs to the Texas Instruments SN74AS logic family, which utilizes advanced Schottky technology for high-speed performance. It serves as a direct functional replacement for older parity generators like the SN74ALS180 and SN74AS180 in legacy designs, offering improved speed and simplified integration through its internal input buffering.

Replacement Considerations

The SN74ALS280 provides an identical function and can be substituted directly in existing designs.