74LCXH2245MSA

Overview

The onsemi 74LCXH2245MSA is a low voltage bidirectional transceiver featuring eight non-inverting buffers with 3-STATE outputs. It operates within a supply voltage range of 2.0V to 3.6V and utilizes advanced CMOS technology for high-speed operation with low power dissipation. The device incorporates active bushold circuitry on data inputs, eliminating the need for external pull-up or pull-down resistors. Additionally, it includes an equivalent 26/58 series resistor in the B port outputs to reduce overshoot and undershoot.

Feature Summary

• Features active bushold circuitry on all data inputs to maintain valid logic levels without external components
• Integrates equivalent series resistance in B port outputs to minimize signal overshoot and undershoot
• Provides 5V tolerant control inputs for compatibility with mixed-voltage systems
• Offers power down high impedance outputs to isolate the bus during inactive states

Applications

• Bus-oriented applications requiring bidirectional data transfer
• Mixed voltage level translation between 2.5V and 3.3V domains
• High speed communication interfaces utilizing standard logic families

Procurement Notes

Verify package type MSA20 (20-Lead Shrink Small Outline Package) matches design requirements. Confirm operating temperature range covers -40°C to 85°C. Ensure ESD protection specifications meet system standards. Check RoHS compliance documentation for material restrictions. Validate pinout alignment with schematic before integration.

Selection Notes

Select this component for designs requiring bidirectional buffering with integrated noise reduction. The bushold feature simplifies PCB layout by removing pull resistors. Consider the 26/58 series resistor value if signal integrity analysis indicates excessive ringing on B port lines. Verify input voltage thresholds align with source driver capabilities across the full operating temperature range.

Part Context

This part belongs to the LCXH family of low voltage CMOS logic devices. It is functionally similar to other octal bus transceivers but distinguished by its specific bushold implementation and integrated series resistance. The MSA suffix denotes the shrink small outline package variant, offering a compact footprint suitable for space-constrained surface mount applications.

Replacement Considerations

Direct substitutes include the 74LCXH2245WM (SOIC), 74LCXH2245SJ (SOP), and 74LCXH2245MTC (TSSOP). These variants share identical electrical characteristics and pinouts but differ only in physical package dimensions. Ensure the replacement package fits the existing board footprint or allows for mechanical redesign.

FAQ

What is the purpose of the bushold feature?

Bushold maintains the last known logic state at the input when the driving signal is removed or floating, preventing undefined states without requiring external pull-up or pull-down resistors.

How does the series resistor affect performance?

The equivalent 26/58 series resistor in the B port outputs helps dampen signal reflections, reducing output overshoot and undershoot to improve signal integrity.