MC74LCX540DTR2G

Overview

The MC74LCX540DTR2G is an octal buffer and line driver manufactured by onsemi, belonging to the 74LCX logic family. It operates within a supply voltage range of 2 V to 3.6 V and features eight channels with inverting, three-state outputs. The device utilizes a 20-pin TSSOP surface-mount package and supports SMD/SMT installation. Key electrical characteristics include a propagation delay of 8 ns, high-level output current of -24 mA, and low-level output current of 24 mA. It functions reliably across an operating temperature range from -40 °C to +85 °C.

Feature Summary

• Octal configuration providing eight independent inverting buffer channels for parallel data handling
• Three-state output capability allowing direct connection to bus structures without external drivers
• Low-voltage CMOS technology enabling operation between 2 V and 3.6 V for power efficiency
• High drive strength supporting sink and source currents up to 24 mA

Applications

• Bus-oriented memory and register implementations requiring bidirectional data transfer
• Clock distribution networks utilizing three-state control for signal isolation
• Portable consumer electronics powered by single-cell lithium batteries or low-voltage supplies
• Communication systems needing level shifting between 3.3 V and 5 V domains

Procurement Notes

Verify the complete part number including the suffix DTR2G to ensure correct packaging and tape-and-reel specifications. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Check for recent Product Change Notifications (PCN) regarding pinout or material updates. Ensure the procurement channel provides original manufacturer traceability to avoid counterfeit components.

Selection Notes

Select this component when designing systems requiring eight buffered signals with active drive control. The LCX series is suitable for applications demanding low power consumption alongside moderate speed performance. Verify that the system voltage remains within the 2 V to 3.6 V operational window. Consider the TSSOP-20 footprint constraints during PCB layout planning to ensure adequate thermal dissipation and mechanical stability.

Part Context

This device belongs to the MC74LCX74 series of low-voltage CMOS logic integrated circuits. It complements other members like the MC74LCX74DTR2G flip-flop by providing complementary buffering functionality. The LCX family is designed to bridge 5 V and 3.3 V systems while maintaining compatibility with standard TTL inputs. It serves as a foundational building block for digital interface circuits in modern embedded designs.

Replacement Considerations

Direct substitutes may include other octal buffers from the same LCX family, such as non-inverting variants like the MC74LCX541. Cross-reference pinouts and electrical characteristics carefully when considering alternatives from different manufacturers. Ensure any replacement maintains the 20-TSSOP package dimensions and 3.6 V maximum rating.