MC74ACT540DTR2

Overview

The MC74ACT540DTR2 is an octal buffer and line driver manufactured by onsemi, belonging to the 74ACT logic series. It features eight non-inverting channels with three-state outputs housed in a TSSOP-20 package. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a propagation delay of 13 ns at 5 V, high-level output current of -24 mA, low-level output current of 24 mA, and static current of 8 µA. It supports industrial operating temperatures from -40°C to +85°C.

Feature Summary

• Provides eight non-inverting buffered channels for signal transmission
• Features three-state outputs allowing isolation from bus lines when disabled
• Utilizes TTL-compatible inputs for direct interface with standard logic circuits
• Employs through-pin architecture with inputs and outputs on opposite sides for optimized PCB layout

Applications

• Memory address and data bus driving
• Clock signal distribution and buffering
• Microprocessor I/O port expansion
• Bidirectional bus transceivers

Procurement Notes

Verify the specific suffix DTR2 against official datasheets to confirm tape-and-reel packaging and RoHS compliance status. Ensure the ordering part number matches the exact pinout and electrical specifications required for the design. Cross-reference with manufacturer documentation to validate active status and environmental declarations before finalizing procurement.

Selection Notes

Select this component when designing systems requiring octal buffering with high drive capability and three-state control. The ACT series offers speed comparable to LS-TTL with CMOS power efficiency. Consider the TSSOP-20 package constraints and thermal dissipation requirements. Verify input compatibility with existing logic levels and ensure the 5V supply rail aligns with system power architecture.

Part Context

This device is part of the MC74AC(T)540/541 family of octal buffers and line drivers. It serves as the inverting counterpart to the MC74ACT541. The family is designed for memory and address driving, clock driving, and bidirectional bus transceivers. It shares functional similarities with other 74-series drivers but utilizes a through-pin layout for improved board density.

Replacement Considerations

MC74ACT541DTG (Non-inverting variant)

FAQ

Is the MC74ACT540DTR2 inverting or non-inverting?

The MC74ACT540 is an inverting buffer, whereas the MC74ACT541 is the non-inverting version.

What is the maximum output current capability?

The device provides a high-level output current of -24 mA and a low-level output current of 24 mA.