SN74AS280N

Overview

The SN74AS280N is a universal 9-bit parity generator/checker utilizing advanced Schottky high-performance circuitry. It provides complementary odd and even parity outputs for nine data lines (A through I). The device operates within a supply voltage range of 4.5 V to 5.5 V, with 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 features buffered inputs to lower drive requirements and supports cascading for expanded word lengths up to 81 bits.

Feature Summary

• Generates or checks odd and even parity for nine data lines simultaneously
• Cascadable architecture allows expansion for word lengths up to 81 bits
• Compatible with existing MSI parity circuits without expander inputs

Applications

• Data integrity verification in digital communication systems
• Memory subsystem error detection logic
• System upgrades replacing legacy SN74ALS180 and SN74AS180 parity generators

Procurement Notes

Verify that the specific orderable part number matches the required package style, as the SN74AS280 family includes both plastic DIP and small-outline variants. Confirm the suffix indicates the standard PDIP-14 configuration if through-hole mounting is necessary. Ensure the active status aligns with long-term availability requirements for the design lifecycle.

Selection Notes

Select this component when high-speed parity generation is required for nine-bit data words. The buffered inputs reduce loading on upstream drivers compared to unbuffered alternatives. Consider the AS series performance characteristics against ALS variants if power consumption versus speed trade-offs favor the advanced Schottky technology.

Part Context

This device belongs to the Texas Instruments SN74AS logic family, which utilizes advanced Schottky technology for high-speed operation. It serves as a direct functional replacement for older parity checkers like the SN74ALS180 and SN74AS180, offering identical functionality despite the absence of dedicated expander pins by utilizing terminal 4 for cascading.

Replacement Considerations

SN74ALS280N is a verified substitute within the same datasheet offering similar functionality with different electrical characteristics.