SN74ALS240AN

Overview

The SN74ALS240AN is an octal buffer and line driver from the Texas Instruments SN74ALS series. It features eight inverting outputs with three-state capability, housed in a 20-pin PDIP package. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical characteristics include a low-level output current of 48 mA and a high-level output current of -16 mA. Propagation delay is typically 9 ns at nominal supply voltage. The component supports through-hole mounting and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Provides eight inverting buffer channels with three-state output control for bus-oriented communication systems.
• Delivers high drive capability suitable for driving heavy capacitive or resistive loads on data buses.
• Features low power consumption relative to standard TTL while maintaining fast switching speeds.

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented architectures

Procurement Notes

Verify the specific ordering suffix to confirm the package type and tape/reel versus tube packaging configuration. Ensure the requested variant matches the required logic family specifications and environmental compliance standards before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring octal buffering with three-state isolation. Consider the ALS logic family balance between speed and power dissipation compared to standard or HC alternatives. Verify that the 20-pin DIP footprint aligns with the target PCB layout constraints.

Part Context

This part belongs to the SN74ALS (Advanced Low-power Schottky) logic family, which offers improved performance over standard 74LS devices. The SN74240A designation specifically identifies the octal buffer/driver topology within the broader Texas Instruments logic portfolio.

Replacement Considerations

Compatible substitutes include the SN74AS240AN for higher speed requirements and the SN74HC240AN for lower power applications. Verify pin compatibility and electrical parameter alignment when transitioning between these variants.