SN74ALS240ADW

Overview

The SN74ALS240ADW is a dual four-bit bus driver manufactured by Texas Instruments, belonging to the Advanced Low-Power Schottky (ALS) logic family. It features 3-state outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides a propagation delay of 9 ns at nominal supply voltage. It supports a maximum low-level output current of 48 mA and a high-level output current of -400 µA. Designed for surface-mount applications, it is housed in a 20-pin LDCC package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Dual four-bit architecture providing independent control over two separate data buses
• Advanced Low-Power Schottky technology ensuring high-speed operation with reduced power consumption
• Three-state outputs allowing direct connection to bus lines without additional drivers

Applications

• Memory map control systems
• Clock drivers
• Bus-oriented transmissions

Procurement Notes

Verify the specific suffix 'DW' corresponds to the 20-pin plastic leaded chip carrier (LDCC) package configuration. Confirm that the component meets the required RoHS compliance standards for your manufacturing process. Ensure the ordering part number matches the exact pinout and electrical specifications documented in the official Texas Instruments datasheet for the SN74ALS240A series.

Selection Notes

Select this component when designing systems requiring high-speed bidirectional data transfer between microprocessors and peripheral devices. The ALS series offers a superior speed-power product compared to standard TTL. Consider the 48 mA sink capability for driving heavy capacitive loads on bus structures. Verify that the system voltage remains strictly within the 4.5 V to 5.5 V range to maintain signal integrity and prevent device damage.

Part Context

This device is part of the broader SN74ALS240A family of octal bus transceivers. While variations exist in packaging options such as SOIC or TSSOP, the ADW designation specifically identifies the LDCC form factor. It serves as a critical interface element in digital logic circuits, facilitating efficient data routing in complex embedded architectures where multiple components share common data pathways.

Replacement Considerations

Compatible substitutes include the SN74ALS240AN and SN74ALS240N from Texas Instruments, provided the through-hole DIP package is acceptable. Other manufacturers may offer equivalent parts under different numbering schemes, but verification of pin compatibility and electrical parameters against the original datasheet is mandatory.