74LCX16245TTR

Overview

The 74LCX16245TTR is a low-voltage CMOS 16-bit bus transceiver with 3-state outputs, fabricated using sub-micron silicon gate and double-layer metal wiring C²MOS technology. It operates within a voltage range of 2.0V to 3.6V, supporting 1.5V data retention. The device features 5V tolerant inputs and outputs, ensuring compatibility with 5V signal environments. Key electrical parameters include a maximum propagation delay (tPD) of 4.5 ns at VCC = 3V, symmetrical output impedance with |IOH| = IOL ≥ 24 mA at VCC = 3V, and balanced propagation delays where tPLH ≈ tPHL. It provides power-down protection on all inputs and outputs.

Feature Summary

• Features 5V tolerant inputs and outputs for interfacing with 5V signal environments while operating at lower voltages.
• Provides high-speed performance with a maximum propagation delay of 4.5 ns at 3V supply voltage.
• Includes power-down protection on inputs and outputs to prevent excessive current consumption during power-off states.
• Offers symmetrical output impedance and balanced propagation delays for reliable data transmission.

Applications

• Two-way asynchronous communication between data buses
• Low-power and high-speed 3.3V applications
• Interfacing 3.3V logic with 5V signal environments

Procurement Notes

Verify the specific ordering code matches the required package type, as the TTR suffix indicates Tape & Reel packaging in the TSSOP-48 format. Confirm that the operating voltage range of 2.0V to 3.6V aligns with your system's power supply requirements. Ensure that the 5V tolerance of inputs and outputs is sufficient for your interface signals. Check for any additional environmental or radiation hardness requirements not covered by standard commercial specifications.

Selection Notes

Select this component when designing systems requiring bidirectional data transfer between buses operating at different voltage levels, specifically 3.3V and 5V. Its low power dissipation makes it suitable for battery-operated devices. The 16-bit width reduces pin count compared to 8-bit alternatives. Consider the TSSOP-48 package for space-constrained PCB layouts. Verify that the 24 mA drive current meets the load requirements of your destination bus.

Part Context

This device belongs to the 74LCX series of low-voltage CMOS logic components from STMicroelectronics. It is functionally compatible with the 74HC and 74HCT series but offers improved speed and lower power consumption at 3.3V operation. The 16245 designation indicates a 16-bit bus transceiver with non-inverting logic and 3-state outputs, commonly used in memory interfaces and microcontroller data paths.

Replacement Considerations

Check for direct pin-compatible replacements such as the 74LCX16245 in tube packaging if reel quantity is not required. Other manufacturers may offer equivalent parts under different part numbers; verify electrical specifications like propagation delay and output current before substitution.

FAQ

What is the maximum propagation delay of the 74LCX16245TTR?

The maximum propagation delay (tPD) is 4.5 ns when the supply voltage (VCC) is 3V.

Can the 74LCX16245TTR interface directly with 5V logic?

Yes, both the inputs and outputs are 5V tolerant, allowing safe interfacing with 5V signal environments even when powered by 3.3V.

Does the device have power-down protection?

Yes, the 74LCX16245TTR includes power-down protection on all inputs and outputs to minimize leakage current when the device is powered off.