74ACT280MTR

Overview

The 74ACT280 is a 9-bit parity generator and checker fabricated using advanced high-speed CMOS technology. It features nine data inputs (A to I) and two outputs: ΣODD and ΣEVEN. The device generates odd or even parity based on the number of high-level inputs, maintaining symmetry in propagation delays. It operates within a voltage range of 4.5V to 5.5V, with a typical propagation delay of 7ns at 5V. Quiescent supply current is maximized at 4μA at 25°C. Outputs drive 50Ω transmission lines with symmetrical impedance of 24mA minimum.

Feature Summary

• Advanced high-speed CMOS fabrication for low power dissipation
• Direct interface capability with TTL, NMOS, and CMOS systems
• Symmetrical output impedance ensuring balanced signal integrity
• Built-in protection circuits against static discharge

Applications

• Data bus error detection and correction
• Communication system parity checking
• Memory module data integrity verification
• Industrial control system input validation

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors. Confirm package type matches design requirements, as the 74ACT280MTR indicates a tape-and-reel SOP-14 variant. Check datasheet revision dates to ensure compatibility with specific electrical tolerances. Validate that the obsolete status does not impact long-term supply chain stability for production runs.

Selection Notes

Select this component when designing 5V logic systems requiring robust parity generation. Ensure operating temperatures align with the -55°C to 125°C range. Verify input voltage levels meet the specified VIH and VIL thresholds for reliable interfacing. Consider the pin-compatible nature with standard 74 series devices for straightforward PCB layout transitions.

Part Context

This part belongs to the 74ACT family of high-speed CMOS logic devices. It serves as a specialized function block within digital logic circuits, distinct from general-purpose gates. The ACT series bridges performance gaps between older TTL standards and modern CMOS efficiency, providing enhanced speed without sacrificing power consumption metrics.

Replacement Considerations

The datasheet confirms pin and function compatibility with the standard 74 Series 280. Designers may substitute equivalent parts from other manufacturers provided they match the 74ACT electrical specifications and package dimensions exactly.