SN74HC540PWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC540PWR 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 TSSOP-20 package with inputs and outputs positioned on opposite sides to facilitate printed circuit board layout. It provides high-current 3-state outputs capable of driving bus lines directly or up to 15 LSTTL loads, while maintaining low power consumption with a maximum ICC of 80 μA.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal buffers and line drivers featuring 3-state outputs for direct bus line driving
• Data flow-through pinout configuration with inputs and outputs located on opposite sides of the package
• Low power consumption characteristics with a maximum ICC of 80 μA
• High-current 3-state outputs capable of driving up to 15 LSTTL loads

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented systems requiring high-drive capability
• Clock drivers and buffer circuits
• Memory module address and data bus buffering

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'PWR' corresponds to the TSSOP-20 package and tape-and-reel carrier format. Confirm RoHS compliance status and moisture sensitivity level (MSL) ratings prior to assembly. Ensure that unused inputs are tied to logic high or low states to prevent undefined operational conditions during operation.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal inverting buffer with 3-state control is required for high-speed digital applications. The HC series offers performance comparable to the legacy HC240 series but with a more convenient pinout arrangement. Consider the 2 V to 6 V operating range and the specific thermal resistance values associated with the TSSOP package for thermal management planning.

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 distinguishes itself through its specific pinout arrangement where all inputs are placed on one side and all outputs on the other. This design choice simplifies PCB routing compared to standard octal buffer layouts.

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 implemented as a 2-input NOR gate. If either output-enable input (OE1 or OE2) is held high, all eight outputs enter a high-impedance state regardless of the input signals.

What is the typical propagation delay for this device?

The typical propagation delay (tpd) is 8 ns, though actual values vary based on the supply voltage and load capacitance conditions specified in the switching characteristics tables.