MC74HC240ADTR2G

Overview

The MC74HC240ADTR2G is an octal 3-state inverting buffer and line driver manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V and supports an operating temperature from -55°C to +125°C. The device features two active-low output enables and provides high noise immunity characteristic of CMOS devices. Propagation delays vary with voltage: 80 ns at 2.0 V, 40 ns at 3.0 V, 16 ns at 4.5 V, and 14 ns at 6.0 V. Output drive capability supports up to 15 LSTTL loads.

Feature Summary

• Octal 3-state inverting buffer/line driver design
• Outputs directly interface to CMOS, NMOS, and TTL logic families
• Compatible with standard CMOS outputs and LSTTL outputs when pullup resistors are used

Applications

• Memory address drivers
• Clock drivers
• Sub-oriented systems

Procurement Notes

Verify the specific ordering suffix 'DTR2G' corresponds to the TSSOP-20 package and tape-and-reel shipping configuration. Confirm RoHS compliance and Pb-free status requirements for the target assembly process. Ensure the application environment remains within the specified -55°C to +125°C operating temperature range and 2.0 V to 6.0 V supply voltage limits.

Selection Notes

Select this component for applications requiring octal bus driving with inverting functionality and 3-state control. It serves as a pinout-compatible alternative to LS240 devices while offering CMOS input compatibility. Consider the propagation delay specifications relative to the system clock speed and supply voltage to ensure timing margins are met.

Part Context

This part belongs to the MC74HC240A series of high-performance silicon-gate CMOS logic devices. It shares functional similarities with the HC244A but differs in output polarity. The device contains 120 FETs or 30 equivalent gates and is designed for robust performance in digital signal processing and memory interfacing environments.

Replacement Considerations

The datasheet notes the device is identical in pinout to the LS240. No other specific substitute part numbers are documented in the provided source material.