74LCX240TTR

Overview

The STMicroelectronics 74LCX240TTR is a low-voltage CMOS octal bus buffer featuring three-state inverted outputs and 5V tolerant inputs and outputs. Fabricated using sub-micron silicon gate C2MOS technology, it operates within a supply voltage range of 2.0 V to 3.6 V, with data retention down to 1.5 V. The device provides high-speed performance with a maximum propagation delay of 6.5 ns at 3.0 V. It offers symmetrical output impedance with minimum drive currents of ±24 mA at 3.0 V, ensuring PCI bus level compliance. The component includes power-down protection on all I/Os and robust ESD immunity exceeding 2 kV HBM.

Feature Summary

• Features 5V tolerant inputs and outputs for direct interfacing with 5V signal environments while operating at lower voltages.
• Provides high-speed operation with balanced propagation delays and symmetrical output impedance suitable for memory address drivers.
• Includes power-down protection circuits on inputs and outputs to prevent excessive current consumption during power-off states.

Applications

• Three-state memory address drivers
• Clock drivers
• Bus-oriented communications

Procurement Notes

Verify the package type matches the TSSOP-20 designation associated with the 'TTR' suffix in official ordering tables. Confirm that the required operating temperature range aligns with the industrial specifications provided in the datasheet. Ensure design compatibility with the specified absolute maximum ratings to prevent device damage.

Selection Notes

Select this component when an octal bus buffer with 5V tolerance is required for 3.3V systems. It serves as a pin-compatible replacement for standard 74 series 240 devices. Consider its low power consumption and high speed relative to the 5V AC/ACT family for optimized system performance.

Part Context

This part belongs to the 74LCX logic family, designed for low-voltage applications. It utilizes advanced CMOS technology to achieve performance comparable to older 5V families while reducing power consumption. The device is manufactured by STMicroelectronics and is available in surface-mount packages including TSSOP.

Replacement Considerations

The 74LCX240TTR is functionally compatible with other 74 series 240 variants. Verify pinout and electrical characteristics against specific legacy parts before substitution.