SN74AS756N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AS756N is an octal buffer and line driver from the Texas Instruments AS logic series, housed in a 20-pin PDIP package. It operates on a supply voltage (VCC) ranging from 4.5 V to 5.5 V with a typical nominal value of 5 V. The device features eight inputs and eight outputs with inverting polarity. Electrical characteristics include a low-level output current (IOL) of up to 64 mA at 0.55 V maximum VOL. Switching performance under standard test conditions (CL = 50 pF, RL = 500 Ω) specifies propagation delays (tPLH/tPHL) between input and output ranging from 1 ns to 7 ns, while enable-to-output delays range from 1 ns to 19.5 ns.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Designed to improve performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers by eliminating the need for 3-state overlap protection.
• Features open-collector outputs capable of driving bus lines or buffer memory address registers.
• Utilizes PNP inputs to reduce DC loading on preceding circuitry.

Buffers, Drivers, Receivers, Transceivers Applications

• Memory address drivers
• Clock drivers
• Bus-oriented receivers and transmitters

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the Package Option Addendum to confirm the exact physical package type, such as the standard plastic DIP (N), small-outline (DW), or ceramic variants. Ensure the selected part matches the required operating temperature range, as catalog versions are rated for 0°C to 70°C while military versions cover -55°C to 125°C. Confirm RoHS compliance status if environmental regulations apply to the assembly process.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring high fan-out and improved fan-in capabilities for bus structures. The open-collector architecture allows for wired-OR connections and direct interfacing with higher voltage loads without external level shifters. Consider the AS logic family's speed-power trade-offs compared to ALS or F families when balancing power consumption against signal integrity requirements in high-speed digital environments.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74AS756/757 family of octal buffers and line drivers. It serves as an open-collector version of the ′AS240A and ′AS241 devices. The SN74AS756 provides inverting outputs, whereas the companion SN74AS757 offers non-inverting outputs. Both share identical pinouts and electrical characteristics, differing only in logical polarity, allowing designers to choose based on signal inversion needs within the same mechanical footprint.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

• SN74AS757N

Buffers, Drivers, Receivers, Transceivers FAQ

What is the primary advantage of using the SN74AS756 over standard 3-state buffers?

It eliminates the need for separate 3-state overlap protection circuitry, thereby improving system density and performance in bus-oriented designs.

How does the open-collector output configuration benefit bus applications?

The open-collector outputs can drive bus lines directly and support wired-OR logic, simplifying interface design for memory address registers and multi-drop communication buses.