CD74HC243E

Overview

The CD74HC243E is a high-speed CMOS logic quad-bus transceiver manufactured by Harris Corporation. It features four bidirectional data paths with three-state outputs, enabling efficient bus-oriented memory and communication systems. The device operates within a supply voltage range of 2V to 6V and supports an operating temperature range from -55°C to 125°C. Packaged in a standard 20-pin DIP format, it provides robust signal integrity for digital applications requiring low power consumption and wide voltage tolerance.

Feature Summary

• Provides four independent bidirectional data transmission channels
• Features three-state outputs for direct bus connection without additional drivers
• Supports operation across a wide industrial temperature range

Applications

• Bus-oriented memory systems
• Communication systems requiring bidirectional data transfer
• Digital signal routing in embedded controllers

Procurement Notes

Verify the manufacturer origin carefully, as Texas Instruments acquired Harris Semiconductor's logic product lines. Ensure the specific part number matches the required package style and that any ordering suffixes do not indicate functional variations or different compliance statuses compared to the base specification.

Selection Notes

Select this component when designing systems requiring bidirectional data flow between buses. Consider the HC series speed and power characteristics relative to system requirements. Verify compatibility with the target logic family voltages and ensure the three-state control signals align with the system's bus arbitration logic.

Part Context

This component belongs to the 74HC logic family, known for high-speed CMOS performance similar to TTL but with lower power consumption. The CD74HC243E specifically addresses the need for versatile data direction control in complex digital architectures, serving as a critical interface element in legacy and specialized electronic designs.

Replacement Considerations

The CD74HC243EE4 is a verified equivalent variant offered by Texas Instruments. When substituting, confirm that the pinout and electrical specifications remain identical to ensure seamless integration into existing circuit layouts without redesign.