74HC244D

Overview

The Toshiba Semiconductor and Storage 74HC244D is an octal buffer and line driver fabricated using silicon gate CMOS technology. It features two independent four-bit buffers with three-state outputs, enabling bidirectional data transmission on bus-oriented systems. The device operates within a supply voltage range of 2V to 6V and supports input levels compatible with standard CMOS logic. Designed for high-speed applications, it offers low power consumption and improved switching speeds compared to equivalent LS-TTL devices. The component is housed in a 20-pin SOIC package.

Feature Summary

• Octal configuration providing eight buffered channels for efficient bus management
• Three-state output capability allowing direct connection to system buses without additional drivers
• CMOS fabrication ensuring low static power dissipation and high noise immunity
• Non-inverting logic function maintaining signal polarity during transmission

Applications

• Memory address drivers for storage systems
• Clock distribution circuits for timing signals
• Bus-oriented transceivers for data communication
• I/O port expansion in microcontroller systems

Procurement Notes

Verify the specific manufacturer designation as Toshiba Semiconductor and Storage to ensure component authenticity. Confirm that the ordering suffix corresponds to the SOIC-20 package variant. Check current lifecycle status, as availability may be limited due to potential obsolescence phases. Ensure compatibility with existing PCB footprints and verify RoHS compliance requirements for the target assembly process.

Selection Notes

Select this component when an octal buffer with three-state outputs is required for bus isolation or driving. Consider the 2V to 6V operating range for flexibility in various logic families. Evaluate the propagation delay specifications against system timing constraints. Compare pinout compatibility with legacy designs if replacing older buffer types in existing hardware architectures.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It serves as a fundamental building block for digital systems requiring signal buffering and bus driving capabilities. The octal configuration allows for parallel data handling, making it suitable for wide data paths. Its design aligns with industry-standard logic functions while offering modern CMOS performance characteristics.

Replacement Considerations

Compatible substitutes include SN74HC244 from Texas Instruments and MM74HC244 from ON Semiconductor. Verify pin compatibility and electrical parameters before substitution. Ensure the alternative device meets the same voltage and temperature specifications.