MC74LCX646DWR2

Overview

The MC74LCX646DWR2 is an octal bus transceiver from the onsemi LCX logic family, designed for surface-mount applications in SOIC-24 packages. It operates within a supply voltage range of 2 V to 3.6 V, supporting CMOS input and output levels. The device features non-inverting data transmission with three-state outputs, ensuring low power consumption and high noise immunity. Key electrical characteristics include a maximum propagation delay of 10 ns at 3.3 V with 50 pF load, and output drive capabilities of ±24 mA. It functions reliably across an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Octal configuration providing eight independent bidirectional data channels for efficient bus management
• Three-state outputs enable direct connection to system buses without additional pull-up or pull-down resistors
• Low power consumption design suitable for battery-operated and portable electronic equipment
• CMOS compatible inputs and outputs ensure seamless integration with standard digital logic families

Applications

• Mobile communications equipment requiring low voltage operation
• Consumer electronics utilizing battery-powered logic circuits
• Portable computing devices needing compact bus interface solutions
• Industrial control systems operating within specified temperature ranges

Procurement Notes

Verify the specific suffix 'DWR2' against official manufacturer documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with existing PCB footprint designs for SOIC-24 components. Cross-reference lead times and availability directly with authorized distributors, as supply chain conditions may vary. Confirm that the procurement source provides genuine parts with traceable manufacturing dates to maintain quality standards.

Selection Notes

Select this component when designing systems requiring multiple bidirectional data paths under low voltage constraints. The LCX series offers superior speed compared to older HC/HCT families while maintaining lower power dissipation. Consider the 3.6 V maximum rating when interfacing with higher voltage domains, potentially requiring level shifting. Evaluate the 10 ns propagation delay against system timing requirements to ensure signal integrity is maintained across the bus width.

Part Context

This part belongs to the MC74LCX series, which represents low-voltage CMOS technology optimized for performance and power efficiency. The LCX family bridges the gap between traditional 5 V logic and modern 3.3 V or lower voltage systems. It is widely used in applications demanding fast switching speeds with minimal energy consumption, making it a staple in contemporary digital circuit design for communication and computing hardware.

Replacement Considerations

Direct substitutes include other octal bus transceivers from the same LCX family, such as the MC74LCX646DTG in a TSSOP package. Alternative manufacturers may offer pin-compatible equivalents, but verify voltage ratings and propagation delays carefully. Ensure any replacement maintains the three-state output functionality and CMOS input compatibility required by the original design.