CD74HC243EG4

Overview

The CD74HC243EG4 is a high-speed CMOS logic quad-bus transceiver manufactured by Texas Instruments. It features three-state outputs and operates within a supply voltage range of 2 V to 6 V. The device utilizes a 14-pin SOIC surface-mount package. Key electrical characteristics include a maximum propagation delay of 90 ns at 2 V and output drive capabilities of -7.8 mA for high level and 7.8 mA for low level. It supports an operating temperature range from -55 °C to +125 °C.

Feature Summary

• Provides four bidirectional bus channels with three-state output control
• Compatible with standard CMOS input and output voltage levels
• Designed for high-speed data transfer applications in digital systems

Applications

• Data bus driving and buffering in computer architectures
• Memory module interface circuits
• General-purpose bidirectional data transmission lines

Procurement Notes

Verify the component authenticity by checking the manufacturer marking and date code against official Texas Instruments documentation. Ensure the package type matches the required SOIC-14 footprint on the PCB. Confirm that the supply voltage requirements align with the system design, as the device operates between 2 V and 6 V. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a quad-channel bidirectional bus transceiver with three-state outputs is required. It is suitable for designs needing CMOS compatibility and operation across a wide voltage range. Consider the propagation delay specifications relative to the system clock speed. Ensure the thermal management strategy accommodates the specified operating temperature range of -55 °C to +125 °C.

Part Context

This part belongs to the Texas Instruments 74HC series of high-speed CMOS logic devices. The 74HC family is known for replacing older TTL technologies with lower power consumption and higher noise immunity. The CD74HC243 specifically functions as a bus transceiver, facilitating data movement between different parts of a digital circuit while providing isolation through its three-state capability.

Replacement Considerations

Compatible substitutes include the CD74HC243E and CD74HC243M96. Verify pinout compatibility and electrical parameters before substitution. The 'G4' suffix indicates lead-free and RoHS compliance; ensure equivalent parts meet the same environmental standards.