SNJ54LS640FK

Overview

The SNJ54LS640FK is an octal bus transceiver featuring three-state outputs, manufactured by Texas Instruments. It utilizes a leadless ceramic chip carrier (LCCC) package with 20 pins and operates within a temperature range of -55°C to 125°C. The device belongs to the LS logic family and supports bidirectional data transfer controlled by a single direction control signal.

Feature Summary

• Octal bus transceiver architecture providing eight independent data channels
• Three-state output capability for direct system bus interfacing
• Single common direction control signal manages data flow orientation

Applications

• Memory-to-memory transfers in computer systems
• Bus-oriented communications between microprocessors and peripherals
• Control signals transmission across multiple data lines

Procurement Notes

Verify that the specific ordering suffix FK corresponds to the LCCC package variant. Confirm military-grade qualification requirements if applicable, as indicated by the SN prefix. Ensure environmental specifications align with the -55°C to 125°C operating range documented in the datasheet.

Selection Notes

Select this component when high-density packaging is required alongside extended temperature operation. The LS series offers standard propagation delays suitable for general-purpose digital applications. Verify voltage compatibility with the target system's power supply rails before integration.

Part Context

This part is part of the SN54LS640 through SN54LS645 series of octal bus transceivers. The SNJ54LS640FK specifically denotes the military-qualified version housed in a ceramic LCCC package. It shares functional similarities with other variants in the series but differs in package type and operational temperature limits.

Replacement Considerations

SNJ54LS640J serves as a ceramic DIP alternative within the same family.