SN74HC540NSR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC540NSR is an octal buffer and line driver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and features inverted data at the outputs. The device utilizes a 2-input NOR gate for 3-state control, where high signals on either OE1 or OE2 inputs place all eight outputs in a high-impedance state. It provides high-current outputs capable of driving bus lines directly or up to 15 LSTTL loads. Typical propagation delay is 8 ns, with output drive currents of ±6 mA at 5 V. The package is SO (20), measuring 15.00 mm x 5.30 mm.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal buffers and line drivers with 3-state outputs
• Wide operating voltage range from 2 V to 6 V
• High-current 3-state outputs drive bus lines directly
• Data flow-through pinout with inputs and outputs on opposite sides

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented systems
• Clock buffering and distribution
• Memory module addressing

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'SR' corresponds to the SOP (SO) package type and tape-and-reel packaging configuration as defined in the manufacturer's orderable addendum. Confirm that the RoHS status and lead finish meet project requirements. Ensure the moisture sensitivity level rating aligns with the assembly process capabilities. Cross-reference the active production status to guarantee long-term availability.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal buffer with inverted logic and 3-state capability is required for high-speed digital applications. The wide voltage range supports various logic families. The specific pinout facilitates printed circuit board layout by placing inputs and outputs on opposite sides. Verify that the operating temperature range meets environmental specifications.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SNx4HC540 family of octal buffers and line drivers. It shares performance characteristics with the popular 'HC240 series but offers a distinct pinout arrangement. The family includes multiple package options such as CDIP, SOIC, PDIP, and TSSOP. The SN74HC540NSR specifically denotes the catalog version in the SOP package.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC540DWR

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 typical propagation delay?

The typical propagation delay (tpd) is 8 ns.