74LCXZ245WM

Overview

The 74LCXZ245WM is an octal bidirectional transceiver featuring 3-STATE outputs, designed for low-voltage applications with 5V tolerant inputs and outputs. It operates within a supply voltage range of 2.3V to 3.6V. The device utilizes advanced CMOS technology to achieve high-speed operation while maintaining low power dissipation. Key electrical parameters include a maximum propagation delay of 7.0 ns at 3.3V and output drive capabilities of up to 24 mA. It supports live insertion/withdrawal and includes patented noise reduction circuitry.

Feature Summary

• Provides 5V tolerance on both inputs and outputs for interfacing between low-voltage logic and 5V signal environments.
• Features patented noise and EMI reduction circuitry to improve signal integrity.
• Supports live insertion and withdrawal by ensuring high-impedance states during power-up or power-down sequences.

Applications

• Bus-oriented applications requiring bidirectional data communication
• Interfacing low-voltage (2.5V/3.3V) devices with 5V signal environments
• Systems supporting live insertion or withdrawal of bus components

Procurement Notes

Verify the specific package variant required, as the 'WM' suffix denotes the 20-Lead Small Outline Integrated Circuit (SOIC). Confirm that the design accommodates the recommended operating conditions, specifically the 2.3V to 3.6V supply voltage range. Ensure OE is tied to VCC through a pull-up resistor if high-impedance state during power transitions is critical for the application.

Selection Notes

Select this component when 5V tolerance is required for both input and output sides in a low-voltage system. It is suitable for designs needing high-speed bidirectional transfer with minimal skew. Consider the SOIC-20 package constraints regarding board space and thermal management. Verify that the 24 mA drive current meets the load requirements of the destination bus lines.

Part Context

This device belongs to the LCX family of low-voltage CMOS logic products. It functions as an octal bus transceiver, providing eight non-inverting buffers. The Z designation indicates enhanced 5V tolerance characteristics compared to standard LCX variants. It is manufactured using advanced CMOS processes optimized for speed and power efficiency.

Replacement Considerations

Direct substitutes may include other 8-bit bidirectional transceivers with 5V tolerance from the same manufacturer or competitors. Verify pin compatibility and electrical specifications such as propagation delay and output drive current before substitution.

FAQ

How does the device handle power-up and power-down sequences?

When VCC is between 0V and 1.5V, the device enters a high-impedance state to prevent intermittent low-impedance loading or glitching. To ensure this state, the OE input should be tied to VCC through a pull-up resistor.

What is the maximum propagation delay specified?

The maximum propagation delay (tPD) is 7.0 ns when VCC is 3.3V and the load capacitance is 50 pF.