74LVT240MTCX

Overview

The onsemi 74LVT240MTCX is a low-voltage octal buffer and line driver featuring three-state outputs, housed in a 20-lead Thin Shrink Small Outline Package (TSSOP). It operates within a supply voltage range of 2.7V to 3.6V and supports an input voltage up to 5.5V, enabling interface compatibility with 5V systems. The device provides high drive capability with output currents of -32mA for HIGH states and +64mA for LOW states. Designed using advanced BiCMOS technology, it delivers propagation delays as low as 1.1ns at 3.3V while maintaining low power dissipation.

Feature Summary

• Provides bus-hold functionality on data inputs to eliminate the need for external pull-up resistors for unused inputs
• Supports live insertion and extraction operations without causing system disruption
• Ensures glitch-free bus loading through power-up/down high impedance behavior
• Offers robust electrostatic discharge protection exceeding specified thresholds for human-body, machine, and charged-device models

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented transmitters or receivers

Procurement Notes

Verify the specific package variant matches the required footprint, as the MTC suffix denotes the TSSOP-20 configuration. Confirm that the absence of the 'H' suffix indicates the standard LVT version rather than the LVTH variant with bus-hold features. Ensure the design accounts for the recommended operating conditions, specifically the 2.7V to 3.6V supply voltage range and the -40°C to +85°C temperature limits. Cross-reference the datasheet revision to confirm current manufacturing status and any potential pinout changes.

Selection Notes

Select this component when a low-voltage octal buffer is required to interface between 3.3V logic and 5V tolerant environments. The 74LVT240MTCX is suitable for applications demanding high drive strength and fast switching speeds in compact surface-mount designs. Consider the LVTH240 variant if bus-hold functionality is necessary to simplify circuit design by removing external pull-up components. Evaluate the trade-off between the higher drive current capabilities and the resulting power consumption during active operation.

Part Context

This component belongs to the 74LVT/74LVTH family of low-voltage logic devices manufactured originally by Fairchild Semiconductor and now distributed by onsemi. These parts are designed to replace older 5V logic families while offering improved performance and lower power consumption. The TSSOP packaging allows for higher board density compared to wider SOIC packages, making it ideal for modern compact electronic designs requiring multiple buffered channels.

Replacement Considerations

The 74LVTH240MTCX serves as a functional substitute, differing primarily by the inclusion of bus-hold inputs. Other manufacturers may offer equivalent octal buffers with similar electrical characteristics, but verification of pin compatibility and voltage levels is essential.