CD74HCT240EE4

Overview

The CD74HCT240EE4 is a high-speed CMOS logic inverting octal buffer and line driver with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55°C to +125°C. The device features buffered inputs, high-current bus driver outputs capable of driving standard LSTTL loads, and two active-low output enables. It is housed in a 20-pin PDIP package.

Feature Summary

• Inverting octal buffer configuration with three-state outputs
• Direct compatibility with LSTTL input logic levels
• High-current bus driver outputs for signal transmission
• Dual active-low output enable control

Applications

• Bus-oriented transmissions
• Clock drivers
• Buffered registers

Procurement Notes

Verify the specific 'E4' suffix against current manufacturer documentation to confirm lead-free compliance and RoHS status. Ensure the ordering part number matches the exact package type and thermal rating required for the target application environment.

Selection Notes

Select this component when TTL-compatible input thresholds are required alongside high-speed CMOS performance. The HCT series ensures direct interfacing with LSTTL systems without level shifting. Verify that the 20-pin PDIP package dimensions fit the available PCB footprint and assembly constraints.

Part Context

This device belongs to the CDx4HCT240 family of high-speed CMOS logic buffers. It shares functional similarities with the HC240 but offers HCT-specific electrical characteristics for TTL compatibility. The EE4 variant denotes specific packaging and environmental compliance attributes defined by Texas Instruments.

Replacement Considerations

CD74HC240EE4 (Non-inverting variant)

FAQ

What is the logic function of the CD74HCT240?

The CD74HCT240 functions as an inverting octal buffer with three-state outputs.

How many output enable controls does the device have?

The device has two active-low output enables.