SN74LS640-1NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS640-1NS is an octal bus transceiver manufactured by Texas Instruments, belonging to the 74LS logic series. It features a single circuit with eight bits per element and provides three-state outputs. The device operates within a supply voltage range of 4.75V to 5.25V and supports TTL input and output levels. It is housed in a 20-SOIC package with a width of 5.30mm and is designed for surface-mount installation. The component functions as an inverting transceiver suitable for bidirectional data communication on buses.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture providing eight-bit bidirectional data transfer capability
• Three-state output design enabling direct connection to system data lines without additional buffering
• TTL-compatible input and output voltage levels ensuring interoperability with standard logic families
• Inverting polarity configuration for signal direction control

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data communication on system buses
• Memory interface circuits requiring octal data transfer
• I/O port expansion in digital systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix '1N' against the manufacturer's official datasheet to confirm pinout and electrical characteristics match project requirements. Ensure the 20-SOIC package dimensions align with PCB footprint constraints. Confirm RoHS status and moisture sensitivity level (MSL 3) compliance for assembly processes. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal, inverting, three-state bus transceiver with TTL compatibility is required. The 74LS series offers moderate speed suitable for general-purpose digital applications. Consider the 20-SOIC surface-mount package for space-constrained designs. Verify that the 4.75V to 5.25V operating voltage range matches the system power supply. Evaluate propagation delay specifications if timing constraints are critical for the target application.

Buffers, Drivers, Receivers, Transceivers Part Context

This device is part of the Texas Instruments 74LS logic family, which utilizes Low-power Schottky technology to balance power consumption and switching speed. The SN74LS640 variant specifically serves as an octal bus transceiver, differing from non-inverting counterparts like the SN74LS645. It shares the 20-pin form factor common to many octal logic devices, facilitating design reuse across different logic functions within the same family.

Buffers, Drivers, Receivers, Transceivers FAQ

Is the SN74LS640-1NS inverting or non-inverting?

The SN74LS640-1NS is an inverting bus transceiver, meaning the output signal is logically inverted relative to the input.

What is the maximum supply voltage for this device?

The maximum recommended supply voltage is 5.25V, with a minimum of 4.75V, adhering to standard 5V logic tolerances.