SN74AS756DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AS756DW is an octal buffer and line driver from the Texas Instruments AS logic family, housed in a 20-pin Small-Outline (DW) package. It features open-collector outputs with symmetrical active-low output-enable inputs. The device operates on a supply voltage ranging from 4.5 V to 5.5 V. Electrical characteristics include a low-level output current of up to 64 mA and a high-level output leakage current of 0.1 mA at 5.5 V. Propagation delays range from 1 ns to 20 ns depending on the signal path. The component is rated for operation within a temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Eliminates the need for three-state overlap protection in bus-oriented designs
• Open-collector outputs capable of driving bus lines or memory address registers
• PNP input structure reduces DC loading on preceding drivers

Buffers, Drivers, Receivers, Transceivers Applications

• 3-state memory address drivers
• Clock drivers
• Bus-oriented receivers and transmitters

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific procurement lot matches the SN74AS756DW designation rather than the SN74AS757 variant, as they share identical pinouts but differ in output polarity. Confirm the SOIC-20 package dimensions align with the required PCB footprint. Ensure the operating environment remains within the specified 0°C to 70°C commercial temperature range to maintain electrical performance guarantees.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring high fan-out and improved fan-in capabilities without the complexity of managing three-state overlap conditions. The open-collector architecture allows for wired-OR connections on shared buses. Verify that the system power supply strictly adheres to the 4.5 V to 5.5 V limits to prevent damage to the internal PNP input structures.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments 74AS series, known for advanced Schottky bipolar technology offering higher speed than standard LS logic. The SN74AS756 specifically provides eight inverting buffers with open-collector outputs. It serves as a complementary counterpart to the non-inverting SN74AS757 within the same datasheet specification.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74AS757DWR

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SN74AS756 differ from the SN74AS757?

The SN74AS756 provides inverting outputs, whereas the SN74AS757 provides non-inverting outputs. Both devices share the same pinout configuration and open-collector output structure.

What is the function of the open-collector outputs?

The open-collector outputs allow the device to drive bus lines or buffer memory address registers by enabling multiple outputs to be connected together without short-circuiting, eliminating the need for three-state overlap protection.