SN74ALS240ADBR

Overview

The SN74ALS240ADBR is an octal buffer and line driver from Texas Instruments, belonging to the ALS logic series. It features eight inverting inputs with three-state outputs housed in a 20-pin SSOP package. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical specifications include a high-level output current of -15 mA and a low-level output current of 24 mA. Static current consumption is specified at 4 mA, while operating supply current reaches 14 mA. The component supports surface mount installation and functions reliably within a temperature range of 0°C to +70°C.

Feature Summary

• Provides eight independent inverting buffer channels with three-state output control for bus-oriented applications.
• Utilizes Advanced Low-Power Schottky (ALS) bipolar technology to ensure high-speed switching performance.
• Designed for direct interface with TTL-compatible systems through standardized input and output characteristics.

Applications

• Memory address decoding circuits requiring signal buffering and inversion.
• Clock drivers distributing timing signals across multiple system components.
• Bus-oriented architectures utilizing tri-state outputs for data isolation.

Procurement Notes

Verify the specific suffix 'DBR' confirms the SSOP-20 tape-and-reel packaging configuration. Ensure the ALS logic family designation matches system requirements for bipolar technology characteristics. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Validate that the 4.5V to 5.5V operating voltage aligns with the target power supply design constraints.

Selection Notes

Select this component when bipolar ALS speed and drive capability are required over CMOS alternatives. The SSOP-20 package offers a compact footprint suitable for dense board layouts. Consider the 15mA source and 24mA sink currents for driving moderate capacitive loads. Verify thermal management needs given the 14mA operating current draw under active conditions.

Part Context

This part belongs to the SN74ALS240A family of octal buffers. It shares functional pinouts with other variants like the SN74ALS240ADWR but differs in packaging. The ADWR variant uses SOIC-20, while the ADBR utilizes SSOP-20. Both maintain identical electrical performance profiles defined by the ALS logic standard.

Replacement Considerations

SN74ALS240ADWR serves as a direct functional substitute with identical electrical specifications, differing only in the SOIC-20 package versus SSOP-20. SN74LS240ADBRE4 offers similar functionality using LS logic technology, though with different speed and power characteristics.