SN74ALS244CNS

Overview

The SN74ALS244CNS is an octal buffer and line 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 low-level output current of up to 24 mA. The device utilizes PNP inputs to reduce DC loading and is characterized for operation from 0°C to 70°C. It is housed in a 20-pin Small Outline Package (SOP) with NS suffix.

Feature Summary

• Octal buffers and line drivers designed for bus-oriented receivers and transmitters
• Three-state outputs facilitate connection to bus lines or memory address registers
• PNP inputs provide reduced DC loading on driving circuits

Applications

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

Procurement Notes

Verify the specific ordering suffix 'NS' corresponds to the SOP package variant when sourcing. Confirm that the standard version meets the required electrical specifications, noting that the -1 version differs only in maximum IOL ratings. Ensure compatibility with the 0°C to 70°C operating temperature range for commercial applications.

Selection Notes

Select this component for designs requiring high-density octal buffering with three-state control. The ALS logic family offers improved speed and power consumption compared to standard LS series. Verify input voltage levels align with the source logic family to ensure proper switching thresholds across the recommended operating temperature range.

Part Context

This part belongs to the SN74ALS244C family of octal buffers and line drivers. It shares functional similarities with the SN74ALS240A, SN74ALS241C, SN74AS240A, and SN74AS241A, which offer variations in output inversion and output-enable configurations. The device is distinct from the SN74LS244 due to its Advanced Low-power Schottky technology.

Replacement Considerations

SN74ALS244CN

FAQ

What is the function of the OE inputs?

The OE (Output Enable) inputs control the three-state condition of the outputs. When active, they allow data transfer; when inactive, the outputs enter a high-impedance state.

How does the PNP input structure benefit the circuit?

The PNP inputs reduce DC loading on the preceding driving circuits, allowing for better signal integrity and potentially faster switching speeds in bus applications.