SN74ALS240ANS

Overview

The SN74ALS240ANSR is an octal buffer and driver featuring three-state outputs, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum low-level output current of 24 mA. The device utilizes Advanced Low-Power Schottky (ALS) logic technology with pnp inputs to reduce DC loading. Designed for bus-oriented applications, it provides symmetrical active-low output-enable inputs. The component is housed in a 20-pin SOP package and is rated for operation over a temperature range of 0°C to 70°C.

Feature Summary

• Octal configuration providing eight independent buffered channels
• Three-state outputs designed to drive bus lines or memory address registers
• pnp input structure reduces DC loading on driving circuits
• Symmetrical active-low output-enable inputs facilitate bus management

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented receivers
• Bus-oriented transmitters

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and reel specifications. Ensure that the selected variant matches the required operating temperature range and electrical characteristics for the intended application environment before finalizing procurement.

Selection Notes

Select this component when designing systems requiring high fan-out and improved fan-in capabilities for bus architectures. Consider the ALS logic family for its balance of speed and power consumption. Verify compatibility with existing system voltage levels and ensure that the three-state control signals align with the symmetrical active-low enable requirements of the design.

Part Context

This part belongs to the SN54/74ALS240A series of octal buffers/drivers. It is functionally related to other devices in the family such as the SN74ALS241 and SN74ALS244, offering designers choices between inverting and noninverting outputs. The SN74ALS240A specifically provides inverting outputs with active-low enables, distinguishing it from noninverting variants within the same logic family.

Replacement Considerations

SN74ALS240AN

FAQ

What is the polarity of the outputs for the SN74ALS240A?

The SN74ALS240A features inverting outputs.

How many output-enable inputs does the device have?

The device has two symmetrical active-low output-enable inputs.