SN74ALS240ANSR

Overview

The SN74ALS240ANSR is an octal buffer and line driver from the Texas Instruments SN74ALS series, housed in a 20-pin SOIC package. It features eight inverting outputs with three-state capability, controlled by active-low output enable inputs. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a low-level output current of 8 mA and a high-level output current of -400 uA. Propagation delay is specified at 11 ns, with an operating temperature range from 0°C to +70°C.

Feature Summary

• Provides eight inverting buffer channels with independent three-state control for bus-oriented architectures.
• Delivers high noise immunity and fast switching speeds characteristic of Advanced Low-Power Schottky logic.
• Designed for direct interface with TTL-compatible systems while maintaining CMOS input characteristics.

Applications

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

Procurement Notes

Verify the specific suffix 'ANSR' corresponds to the SOIC-20 surface-mount package and tape-and-reel delivery format. Confirm that the ALS logic family specification aligns with system requirements for 5V operation and drive strength. Check for RoHS compliance status as indicated in official documentation, noting potential variations between legacy and current production runs.

Selection Notes

Select this component when designing systems requiring octal buffering with three-state isolation on a 5V supply. It serves as a suitable replacement for standard 74S240 devices where lower power consumption is prioritized over the higher speed of AS variants. Ensure the application environment remains within the 0°C to +70°C commercial temperature range.

Part Context

This part belongs to the SN74ALS family, representing Advanced Low-Power Schottky technology. It offers a balance between the speed of the 74S series and the power efficiency of the 74LS series. The SN74ALS240 variant specifically provides octal configuration, distinguishing it from hex or quad buffer counterparts in the same logic family.

Replacement Considerations

SN74ALS240N is a verified pin-to-pin alternative in a PDIP-20 package. SN74ALS240APW is another compatible option available in a TSSOP-20 package. Verify package dimensions and thermal characteristics when substituting these variants.