SN74HC540DBR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC540DBR is an octal buffer and line driver from the Texas Instruments HC logic family. It features a wide operating voltage range of 2 V to 6 V and high-current 3-state outputs capable of driving bus lines directly or up to 15 LSTTL loads. The device provides inverted data at the outputs and utilizes a data flow-through pinout with inputs and outputs on opposite sides of the package. Recommended operating conditions specify a supply voltage between 2 V and 6 V, with an operating free-air temperature range of -40 °C to +85 °C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal buffers and line drivers with 3-state outputs
• Wide operating voltage range of 2 V to 6 V
• High-current 3-state outputs drive bus lines directly
• Data flow-through pinout facilitates printed circuit board layout

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented transmissions
• Clock buffering and distribution
• Memory module address/data drivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SOIC-20 package and tape-and-reel carrier configuration. Confirm that the RoHS status and lead finish match project requirements. Ensure the component meets the specified -40 °C to +85 °C operating temperature range for the intended application environment.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal inverting buffer with 3-state control is required. The HC series offers low power consumption and compatibility with standard CMOS logic levels. The opposite-side pinout simplifies PCB routing compared to parallel input/output layouts. Verify that the output drive current meets the load requirements within the 2 V to 6 V supply range.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SNx4HC540 family of octal buffers and line drivers. It shares functional similarities with the SN74HC240 but differs in pinout arrangement. The device is designed for general-purpose digital applications requiring signal inversion and bus isolation within the HC logic family specifications.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC540DWR (SOIC-20, Tape & Reel)

Buffers, Drivers, Receivers, Transceivers FAQ

How does the 3-state control function operate?

The 3-state control gate is a 2-input NOR. If either output-enable (OE1 or OE2) input is high, all eight outputs enter a high-impedance state.

What is the significance of the data flow-through pinout?

The pinout places all inputs on one side of the package and all outputs on the opposite side, which greatly facilitates printed circuit board layout.