SN74ALS240A-1DBR

Overview

The SN74ALS240A-1DBR is an octal buffer and line driver manufactured by Texas Instruments. It features eight inverting inputs with three-state outputs, designed for high-speed digital applications. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical characteristics include a high-level output current of -15 mA and a low-level output current of 24 mA. The static current consumption is specified at 4 mA, while the operating supply current reaches 14 mA. It is housed in a 20-pin SSOP package and supports surface-mount installation.

Feature Summary

• Octal configuration providing eight independent inverting buffers or drivers
• Three-state output capability allowing direct bus connection without external switches
• Designed for improved performance over standard ALS logic families

Applications

• High-speed data buffering on system buses
• Driving capacitive loads in digital communication interfaces
• Memory address and data bus buffering

Procurement Notes

Verify the specific suffix 'DBR' indicates the SSOP-20 package and tape-and-reel packaging format. Confirm the '-1' designation aligns with the required low-level output current specifications compared to the standard SN74ALS240A variant. Ensure compatibility with 4.5V to 5.5V power supplies during integration.

Selection Notes

Select this component when eight-channel inverting buffering with three-state control is required. The SN74ALS240A-1DBR is suitable for designs needing higher drive strength than standard LS logic but compatible with ALS speed. Consider the SSOP-20 footprint constraints and thermal requirements for surface-mount assembly processes.

Part Context

This part belongs to the Texas Instruments SN74ALS series of bipolar logic devices. The SN74ALS240A family provides octal buffers/drivers with three-state outputs. The '-1' variant typically denotes specific electrical parameter adjustments, such as optimized low-level output current, distinguishing it from the standard SN74ALS240A model.

Replacement Considerations

The standard SN74ALS240ADWR serves as a functional equivalent but may differ in low-level output current specifications due to the absence of the '-1' designation. Verify pinout compatibility between SSOP and SOIC packages if substituting.