MC74LCX540MELG

Overview

The MC74LCX540MELG is an octal buffer and line driver manufactured by onsemi, belonging to the LCX logic family. It features eight non-inverting inputs and inverted outputs with three-state capability. The device operates within a supply voltage range of 2.0 V to 3.6 V. It utilizes a 20-pin SOEIAJ surface-mount package. Key electrical characteristics include a maximum low-level output current of 24 mA and a maximum high-level output current of -24 mA. Propagation delay is specified at 15 ns when driving a 50 pF load at 3.3 V. The component supports industrial temperature ranges from -40 °C to +85 °C.

Feature Summary

• Provides eight-bit bus buffering with inverted output polarity for signal integrity maintenance.
• Integrates three-state output control to facilitate direct connection to system buses without external drivers.
• Supports low-voltage operation down to 2.0 V, enabling compatibility with modern low-power digital systems.

Applications

• High-speed data bus buffering in portable electronic devices
• Clock distribution networks requiring signal inversion and isolation
• Memory interface circuits connecting microcontrollers to storage modules

Procurement Notes

Verify the specific suffix 'MELG' against official datasheets to confirm the SOEIAJ-20 package variant, as standard LCX parts often use SOIC or TSSOP. Ensure the procurement source provides traceability documentation confirming the manufacturer is onsemi. Cross-reference the part number with the latest RoHS compliance statements to meet environmental regulations. Confirm that the supplier handles ESD-sensitive components appropriately during shipping and storage.

Selection Notes

Select this component when designing systems requiring octal buffering with inverted outputs at low voltages. The LCX series offers faster switching speeds compared to older HC/HCT families while maintaining CMOS input compatibility. Consider the three-state feature if bus sharing is required. Evaluate the SOEIAJ-20 package dimensions against PCB layout constraints. Ensure the operating voltage aligns with the 2.0 V to 3.6 V specification to avoid performance degradation or damage.

Part Context

This part belongs to the MC74LCX series of advanced low-voltage CMOS logic devices. The LCX family is designed for high-speed applications with low power consumption. Similar parts in the series include the MC74LCX540 (non-inverted) and MC74LCX541 (inverted with different pinout). The MC74LCX540MELG specifically denotes the inverted output version in the compact SOEIAJ-20 package, distinguishing it from standard SOIC variants.

Replacement Considerations

MC74LCX540MELG is functionally equivalent to MC74LCX540MELR regarding logic functionality, though package variations may exist. Verify pin-to-pin compatibility before substitution. Other compatible alternatives include MC74LCX541MTCX for inverted outputs in TSSOP packages, provided the circuit design accommodates the package change.