74LVQ245TTR

Overview

The 74LVQ245TTR is a low voltage CMOS octal bus transceiver with 3-state outputs manufactured by STMicroelectronics. It operates within a supply voltage range of 2V to 3.6V, featuring typical propagation delays of 5.7ns at 3.3V and maximum quiescent current of 5µA. The device provides symmetrical output impedance with minimum drive currents of 12mA at 3.0V and supports PCI bus levels at 24mA. It includes ESD protection exceeding 2kV and is pin-compatible with the standard 74 Series 245.

Feature Summary

• Octal bidirectional bus interface with configurable direction control via DIR input
• Low power dissipation and low noise operation suitable for 3.3V applications
• High speed performance with balanced propagation delays and transmission line driving capability
• Enhanced latch-up immunity and robust ESD protection circuits

Applications

• Two-way asynchronous communication between data buses
• Driving transmission lines with impedances as low as 75 ohms
• PCI bus level interfacing in low voltage systems

Procurement Notes

Verify that the component matches the specific TSSOP-20 package configuration indicated by the ordering suffix. Confirm compliance with RoHS standards and lead-free manufacturing requirements. Ensure the operating environment stays within the specified temperature range of -55°C to +125°C. Check for any specific handling precautions related to the sub-micron silicon gate technology used in fabrication.

Selection Notes

Select this component when designing low voltage systems requiring an octal bus transceiver compatible with standard 74 Series logic pinouts. It is suitable for applications demanding high-speed data transfer with minimal power consumption. Consider its ability to drive 75-ohm transmission lines if signal integrity over long traces is required. Verify that the 2V to 3.6V operating range aligns with the system's power supply constraints.

Part Context

This part belongs to the 74LVQ series of low voltage CMOS logic devices from STMicroelectronics. It utilizes sub-micron silicon gate and double-layer metal wiring C2MOS technology. The device serves as a direct replacement for standard 74 Series 245 transceivers while offering improved electrical characteristics such as lower power dissipation and higher speed performance.

Replacement Considerations

The datasheet confirms pin and function compatibility with the 74 Series 245. Designers should verify that the lower operating voltage range (2V to 3.6V) meets the system requirements compared to traditional 5V variants.