M74HC540B1R

Overview

The M74HC540B1R is a high-speed CMOS octal buffer manufactured by STMicroelectronics, belonging to the 74HC series. It features non-inverting logic with three-state outputs controlled by dual inputs. The device operates within a supply voltage range of 2V to 6V and supports through-hole mounting in a 20-DIP package. It provides an output current capability of 6mA for both high and low states, ensuring robust signal driving. The component is rated for an operating temperature range from -55°C to +125°C, suitable for industrial applications.

Feature Summary

• Octal configuration providing eight independent non-inverting buffer channels
• Three-state output architecture allowing bus line sharing and isolation
• Dual input control mechanism for enabling or disabling all outputs simultaneously
• High noise immunity characteristics inherent to HC CMOS technology

Applications

• Bus-oriented memory and address driver circuits
• Clock drivers and buffering for high-speed digital systems
• Voltage level translation between different logic families
• Isolation buffers for microprocessor data buses

Procurement Notes

Verify the obsolete status of this specific part number before procurement planning. Confirm that the 20-DIP package availability aligns with manufacturing requirements. Check for RoHS compliance documentation if environmental regulations apply. Ensure design-in alternatives are identified due to potential discontinuation risks associated with legacy logic families.

Selection Notes

Select this component when an octal non-inverting buffer with three-state capability is required. The wide supply voltage range allows compatibility with various logic levels. Verify that the 20-DIP package fits the PCB layout constraints. Consider the propagation delay specifications relative to the system clock speed to ensure timing margins are met during operation.

Part Context

This component belongs to the standard 74HC logic family, widely used for general-purpose digital switching. The 'B1R' suffix typically denotes specific packaging or tape-and-reel variations, though the core functionality remains consistent with the base 74HC540 specification. It serves as a fundamental building block for complex digital logic designs requiring signal amplification and isolation.

Replacement Considerations

Direct substitutes include the MM74HC540M from ON Semiconductor and the SN74HC541N from Texas Instruments, noting the latter is non-inverting but functionally similar in buffer role. Verify pinout compatibility and electrical parameters such as output current and propagation delay when cross-referencing alternative manufacturers.