SN74LS348N

Overview

The SN74LS348N is an 8-line to 3-line priority encoder manufactured by Texas Instruments. It belongs to the LS logic family and features three-state outputs. The device accepts eight active-low data inputs and encodes them into a 3-bit binary code on the outputs, prioritizing higher-order inputs. It includes enable inputs for system expansion and control. The component is housed in a 16-pin PDIP package designed for through-hole mounting.

Feature Summary

• Encodes eight active-low inputs into a 3-bit binary output with priority assigned to higher-order lines
• Provides three-state outputs to facilitate bus-oriented systems and direct connection to data buses
• Includes dedicated enable inputs to manage chip activation and allow cascading for larger encoding applications

Applications

• Interrupt controller circuits requiring priority handling of multiple signal sources
• Keyboard encoding systems for converting key presses into digital codes
• Data routing and selection logic in microprocessor-based systems

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and electrical characteristics. Ensure the procurement channel provides valid traceability for industrial or commercial use cases. Confirm that the through-hole PDIP package matches the target PCB footprint requirements before finalizing orders.

Selection Notes

Select this component when an 8-input priority encoding function is required within a TTL-compatible logic environment. The LS series offers standard propagation delays suitable for general-purpose digital logic. Consider the three-state output capability if the design requires sharing a common data bus among multiple devices without external tri-state buffers.

Part Context

This part is a member of the Texas Instruments SN74LS logic family, which utilizes low-power Schottky technology. The SN74LS348 specifically addresses the need for efficient data compression and interrupt management in legacy and modern digital designs. It serves as a fundamental building block for creating complex decision-making logic in embedded systems.

Replacement Considerations

Compatible substitutes include the SN54LS348 for military temperature ranges and generic equivalents such as the MC74LS348 from ON Semiconductor. Verify pin compatibility and electrical specifications before substituting.