74LCXZ245MSAX

Overview

The onsemi 74LCXZ245MSAX is an octal bus transceiver featuring non-inverting bidirectional buffers with three-state outputs. It operates within a supply voltage range of 2.3V to 3.6V and supports 5V tolerant inputs and outputs. The device utilizes advanced CMOS technology for high-speed operation while maintaining low power dissipation. Propagation delay is specified at a maximum of 7.0 ns at 3.3V, with a quiescent supply current of 10 µA max. It includes patented noise reduction circuitry and supports live insertion/withdrawal applications.

Feature Summary

• Provides five-volt tolerant inputs and outputs for interfacing between low-voltage and standard logic environments.
• Features patented noise and EMI reduction circuitry to minimize signal interference during operation.
• Maintains high-impedance state during power-up or power-down to prevent intermittent loading and glitching.

Applications

• Bus-oriented data transmission systems
• Memory interface circuits
• Microprocessor control buses

Procurement Notes

Verify the specific package designation MSA20 corresponds to the required 20-Lead Shrink Small Outline Package (SSOP). Confirm that the ordering code suffix matches the intended tape and reel or tube configuration if applicable. Ensure compatibility with the 2.3V to 3.6V operating voltage range for your target system design.

Selection Notes

Select this component when bidirectional data transfer between 3.3V or 2.5V domains and 5V tolerant interfaces is required. The SSOP package offers a compact footprint suitable for space-constrained designs. Consider the propagation delay specifications relative to your system clock speeds to ensure timing requirements are met without additional buffering.

Part Context

This part belongs to the LCX family of low-voltage CMOS logic devices. It serves as a direct functional replacement for similar octal bus transceivers in legacy designs requiring 5V tolerance. The MSAX suffix indicates a specific manufacturing variant within the broader 74LCXZ245 product line, sharing identical electrical characteristics with other package options like SOIC or TSSOP.

Replacement Considerations

Direct pin-compatible substitutes include the 74LCX245 from various manufacturers such as Fairchild, Toshiba, or STMicroelectronics. Verify that alternative sources maintain the same 5V tolerance and low-voltage operational specifications. Check for any differences in output drive strength or propagation delay if strict timing margins exist in the original design.

FAQ

How does the device handle power transitions?

When VCC is between 0V and 1.5V, the outputs enter a high-impedance state to prevent intermittent low-impedance loading or glitching during power-up or power-down sequences.

What controls the direction of data flow?

The T/R (Transmit/Receive) input determines the direction of data flow through the device, allowing data to transmit either from the A bus to the B bus or vice versa.