DM74S244N

Overview

The DM74S244N is an octal 3-STATE buffer and line receiver manufactured by onsemi (formerly Fairchild Semiconductor). It operates within a supply voltage range of 4.75V to 5.25V and supports a free-air operating temperature from 0°C to +70°C. The device features non-inverting logic with PNP data inputs providing 400mV hysteresis for improved noise rejection. It delivers typical sink currents of 64mA and source currents of -15mA, with propagation delays typically ranging from 6ns to 9ns depending on load conditions.

Feature Summary

• Octal 3-STATE outputs designed to drive bus lines directly
• PNP inputs reduce DC loading on bus lines
• Hysteresis at data inputs improves noise margins
• Capable of driving terminated lines down to 133Ω

Applications

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

Procurement Notes

Verify the component status as this part may be obsolete or discontinued. Confirm that the manufacturer has transitioned production rights or that existing stock remains available through authorized channels. Ensure the package type matches the required PCB footprint and validate that the operating temperature range meets the specific environmental requirements of the target application before finalizing procurement.

Selection Notes

Select this component when high fanout and noise immunity are required in bus-oriented systems. The inclusion of input hysteresis makes it suitable for environments with signal integrity challenges. Consider the power dissipation characteristics and ensure adequate thermal management is provided during continuous operation to maintain performance within specified limits over the recommended operating temperature range.

Part Context

This device belongs to the 74S series of logic integrated circuits, known for Schottky transistor technology offering high speed. It serves as a non-inverting counterpart to the DM74S240. The component utilizes a 20-Lead Plastic Dual-In-Line Package (PDIP) conforming to JEDEC MS-001 standards, facilitating through-hole mounting on printed circuit boards for standard digital logic applications.

Replacement Considerations

Direct parameter-equivalent substitutes include the SN74AS240AN and SN74BCT240N from Texas Instruments.