SN74AS757N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AS757N is an octal buffer and line driver from the Texas Instruments AS logic family, housed in a 20-pin PDIP package. It features open-collector outputs designed to drive bus lines or memory address registers without requiring 3-state overlap protection. The device operates on a supply voltage (VCC) ranging from 4.5 V to 5.5 V. It provides a low-level output current (IOL) of up to 64 mA and includes symmetrical active-low output-enable inputs.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Open-collector outputs eliminate the need for 3-state overlap protection in bus-oriented designs
• PNP input structure reduces DC loading on driving circuits
• High fan-out and improved fan-in capabilities enhance signal integrity
• Symmetrical active-low output-enable inputs allow flexible control configurations

Buffers, Drivers, Receivers, Transceivers Applications

• Driving bus lines in high-density digital systems
• Buffering memory address registers
• Clock distribution drivers
• Bus-oriented receivers and transmitters

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'N' confirms the Plastic Dual In-Line Package (PDIP) with 20 pins. Confirm RoHS compliance status as indicated in the packaging data. Ensure the operating temperature range matches the application requirements, as this catalog version is rated for 0°C to 70°C. Check for any obsolete status indicators if sourcing from secondary distributors.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select the SN74AS757N when open-collector outputs are required for wired-AND bus configurations. Choose this over totem-pole variants if eliminating 3-state overlap protection circuitry is a design priority. Consider the AS series speed characteristics and the specific 64 mA sink capability for heavy bus loads compared to standard TTL or ALS families.

Buffers, Drivers, Receivers, Transceivers Part Context

This component belongs to the Texas Instruments SN74ASxx logic family, known for Advanced Schottky technology providing high speed. It is functionally related to the SN74AS756, which offers complementary inverting/non-inverting outputs, whereas the SN74AS757 provides non-inverting outputs. Both share the same octal buffer architecture and pinout compatibility.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74AS756N serves as a functional substitute if inverting outputs are acceptable or if complementary OE inputs are needed instead of symmetrical ones. Verify that the replacement maintains the open-collector output configuration and PDIP-20 package form factor.