SN74ACT1073NSR

Specialty Logic Overview

The SN74ACT1073NSR is a 16-bit bus-termination array with an integrated bus-hold function, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and accepts input voltages up to 5.5 V. The device features low power consumption similar to CMOS technology and includes center-pin VCC and GND configurations to minimize high-speed switching noise. It provides ESD protection exceeding JESD 22 standards, specifically 2000-V human-body model and 200-V machine model ratings. The component is housed in a 20-pin SOP (NS) package.

Specialty Logic Feature Summary

• Integrated bus-hold function maintains bus lines at the last valid logic state without requiring external pull-up or pull-down resistors.
• Low-impedance diodes clamp undershoots and overshoots caused by line reflections to ensure signal integrity.
• Inputs are TTL-voltage compatible while maintaining low power consumption characteristics typical of CMOS devices.

Specialty Logic Applications

• Terminating output of driving devices in CMOS systems
• Holding inputs of driven devices at logic levels prior to establishing high-impedance states
• Preventing floating bus lines in digital circuits

Specialty Logic Procurement Notes

Verify the specific ordering suffix 'NSR' corresponds to the SOP tape-and-reel packaging configuration. Confirm that the active production status aligns with current project requirements. Ensure compatibility with the specified -40°C to +85°C operating temperature range for the intended application environment.

Specialty Logic Selection Notes

Select this component when terminating 16-bit buses in CMOS environments where signal integrity is critical. The integrated bus-hold feature eliminates the need for discrete resistors, simplifying board layout. Verify that the 4.5 V to 5.5 V supply voltage range matches the system power rails and that TTL-compatible inputs interface correctly with upstream drivers.

Specialty Logic Part Context

This device belongs to the SN74ACT series of logic integrated circuits from Texas Instruments. It is designed specifically for bus termination applications in CMOS systems. The part number indicates a 20-pin SOP package variant supplied in tape-and-reel format for automated assembly processes.

Specialty Logic Replacement Considerations

SN74ACT1073DW: SOIC tube version of the same functional device.

Specialty Logic FAQ

How does the bus-hold function operate?

The bus-hold function uses a CMOS-buffer stage with a high-resistance feedback path between its output and input to keep a bus line tied to the last valid logic state generated by an active driver before the bus switches to a high-impedance state.

What is the purpose of the internal diodes?

The integrated low-impedance diodes clamp the voltage of undershoots and overshoots caused by line reflections, ensuring defined voltage levels on floating bus lines and maintaining signal integrity.