CD74HCT243E

Overview

The CD74HCT243E is a high-speed CMOS logic quad-bus transceiver manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-compatible input levels with CMOS output levels. The device provides non-inverting data transmission across four channels in a 14-pin SOIC package. Key electrical specifications include a maximum propagation delay of 20 ns at 4.5 V with a 50 pF load, a maximum high-level output current of -6 mA, and a maximum low-level output current of 6 mA. It supports an operating temperature range from -55 °C to +125 °C.

Feature Summary

• Provides bidirectional bus transmission for four bits of data
• Features three-state outputs for efficient bus sharing
• Ensures compatibility between TTL inputs and CMOS outputs

Applications

• Mobile communications equipment
• Personal computers and peripherals
• Consumer electronics
• Telecommunications systems

Procurement Notes

Verify the specific suffix 'E' corresponds to the 14-pin plastic small-outline (SOIC) package when sourcing. Confirm that the component meets RoHS compliance standards required for your assembly process. Ensure the supplier provides valid traceability documentation for the Texas Instruments manufacturing origin. Check for any specific handling requirements related to electrostatic discharge during storage and installation.

Selection Notes

Select this component when a quad-bus transceiver with three-state control is required for system interconnects. It is suitable for designs needing interface conversion between TTL and CMOS logic families. Consider the 14-pin SOIC footprint for surface-mount assembly constraints. Evaluate the 20 ns propagation delay against your system's timing requirements to ensure signal integrity is maintained.

Part Context

This part belongs to the Texas Instruments CD74HCT series of high-speed CMOS logic devices. The HCT series is specifically designed to be compatible with standard TTL logic inputs while offering the benefits of CMOS technology. The CD74HCT243 variant functions as a non-inverting bus transceiver, distinct from other series members like the CD74HC243 which may have different input threshold characteristics.

Replacement Considerations

The CD74HC243E serves as a functional substitute within the same family, though it utilizes HC logic thresholds rather than HCT. Verify that the replacement's input voltage levels are compatible with the existing circuit design before implementation.