74LCXH245MSAX

Overview

The onsemi 74LCXH245MSAX is an octal bidirectional transceiver featuring 3-state outputs and integrated bushold circuitry. It operates within a supply voltage range of 2.0V to 3.6V, with recommended specifications provided for 2.3V to 3.6V applications. The device supports 5V tolerant control inputs and delivers ±24mA output drive at VCC = 3.0V. Propagation delay is specified as a maximum of 7.0ns at VCC = 3.3V, with a maximum quiescent supply current of 10µA. It is housed in a 20-lead shrink small outline package (SSOP).

Feature Summary

• Integrated bushold circuitry eliminates the need for external pull-up or pull-down resistors on unused or floating data inputs.
• 5V tolerant inputs allow safe interfacing between low-voltage logic and 5V signal environments.
• Patented noise and EMI reduction circuitry minimizes electromagnetic interference during switching.
• Power-down high impedance state ensures outputs remain disabled when the device is unpowered.

Applications

• Bus-oriented memory and disk controller systems
• High-speed data communication links
• Multiplexer configurations

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current database, as Fairchild part numbers containing underscores may have been converted to dashes during the ON Semiconductor integration. Confirm that the SSOP package variant matches the required footprint and verify RoHS compliance status through official documentation before procurement.

Selection Notes

Select this component when bushold functionality is required to simplify input handling without external resistors. Ensure the application voltage falls within the 2.3V to 3.6V range for optimal performance. Consider the 7.0ns propagation delay limit for timing constraints and verify that the 5V tolerance meets interface requirements with higher voltage logic levels.

Part Context

This device belongs to the LCXH family of low-voltage CMOS octal transceivers. It shares architectural similarities with the standard 74LCX245 but adds bushold features to handle floating inputs. The MSAX designation indicates the shrink small outline package (SSOP) form factor, distinguishing it from SOIC or TSSOP variants within the same logical family.

Replacement Considerations

Direct substitutes include other 74LCXH245 variants from ON Semiconductor or Fairchild, such as the 74LCXH245WM (SOIC) or 74LCXH245MTC (TSSOP), provided the package type is compatible. Standard 74LCX245 devices may serve as functional replacements if bushhold capability is not strictly required.

FAQ

What is the function of the bushold feature?

Bushold maintains unused or floating data inputs at a valid logic level, eliminating the need for external pull-up or pull-down resistors.

How does the device handle power-down conditions?

The device enters a high impedance state for both inputs and outputs when powered down, preventing unwanted current flow.

Is the 74LCXH245 compatible with 5V signals?

Yes, the control inputs are 5V tolerant, allowing safe interfacing with 5V signal environments while operating at lower supply voltages.