SN74LS155ANE4

Overview

The SN74LS155ANE4 is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments SN74LS series. It features two independent decoders with common address inputs and separate gated enable inputs. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0°C to 70°C. It utilizes Schottky process technology for high-speed performance and includes input clamp diodes to limit high-speed termination effects. The component is housed in a 16-pin PDIP package.

Feature Summary

• Dual decoder architecture with shared address lines
• Separate gated enable inputs for each decoder section
• Schottky process implementation for enhanced switching speed
• Integrated input clamp diodes for signal protection

Applications

• Address decoding in microprocessor systems
• Data demultiplexing applications
• Function generator circuits
• Wired-OR logic implementations

Procurement Notes

Verify that the ordering suffix E4 indicates lead-free packaging compliant with RoHS standards. Confirm the specific package variant matches the required PCB footprint, as this part number corresponds to the PDIP configuration. Ensure the procurement channel provides valid traceability documentation consistent with Texas Instruments catalog production data.

Selection Notes

Select this component when a dual decoder or demultiplexer function is required within standard TTL logic families. Consider the LS series characteristics regarding power consumption versus speed trade-offs compared to other variants. Verify that the common address input structure aligns with the system's control line availability and that the active-low output state meets the downstream circuit requirements.

Part Context

This device belongs to the SN74LS155A family of dual 2-line to 4-line decoders. It shares functional similarities with the SN74LS156, which differs primarily by having open-collector outputs suitable for wired-OR configurations. The SN74LS155A represents a standard catalog product designed for general-purpose digital logic applications requiring reliable decoding capabilities.

Replacement Considerations

SN74LS156NE4 offers identical pinout and functionality but features open-collector outputs instead of totem-pole outputs.