SN74LS642NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS642NS is an octal bus transceiver from the Texas Instruments LS logic family, housed in a 20-pin PDIP package. It features TTL input and output levels with inverting polarity. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a propagation delay of 25 ns at 5 V. It provides a maximum low-level output current of 24 mA and a maximum high-level output current of -15 mA. The component functions as a standard transceiver for bidirectional data transfer.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture supporting eight-bit data transmission
• TTL-compatible input and output signal levels
• Inverting polarity configuration for data direction control

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus interfacing between microprocessors and memory modules
• I/O port expansion in digital logic systems
• Data buffering and isolation in communication circuits

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'N' confirms the PDIP through-hole package variant rather than surface-mount options. Confirm the manufacturer source is Texas Instruments or an authorized distributor to ensure LS logic family specifications are met. Check RoHS compliance status if required by project regulations. Validate pinout compatibility with existing PCB footprints before procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal, inverting bus transceiver with TTL compatibility is required. The PDIP package suits prototyping or through-hole manufacturing processes. Ensure the system design accommodates the 25 ns propagation delay and the specified current drive capabilities. Compare against non-inverting variants like the SN74LS645 if signal inversion is not desired.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments SN74LS642 series, which provides octal bus transceiver functionality. It is distinct from the SN74LS640, which offers three-state outputs, and the SN74LS645, which provides non-inverting operation. The SN74LS642NS specifically denotes the plastic dual in-line package version of this standard logic family member.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

• SN74LS642N
• SN74LS642PW