MC74AC245DT

Overview

The MC74AC245DTG is an octal bidirectional transceiver with three-state outputs in a TSSOP-20 package. It operates on a supply voltage of 2.0 V to 6.0 V and supports propagation delays up to 8.5 ns at 5.0 V. The device provides 24 mA source/sink current capability at both A and B ports, features non-inverting buffers, and includes Transmit/Receive and Output Enable control inputs.

Feature Summary

• Bidirectional data path controlled by Transmit/Receive input
• Three-state outputs for bus-oriented applications
• High current sinking and sourcing capability

Applications

• Bus-oriented memory and instrument control systems
• Clock drivers and buffered oscillators
• Multiplexer circuits

Procurement Notes

Verify the specific suffix 'DT' corresponds to the TSSOP-20 package variant. Confirm RoHS compliance status via the manufacturer's ordering information table. Ensure the application environment remains within the specified -40°C to +85°C operating temperature range and that power dissipation limits are not exceeded during operation.

Selection Notes

Select this component when an octal bidirectional buffer with high drive strength is required. The AC series offers faster switching speeds compared to standard logic families. Verify that the system voltage falls within the 2.0 V to 6.0 V range and that the TSSOP-20 footprint matches the PCB layout requirements.

Part Context

This part belongs to the MC74AC245 family of octal bus transceivers. It shares functional similarities with the MC74ACT245 but differs in input threshold compatibility. The DT suffix specifically denotes the Thin Shrink Small Outline Package (TSSOP) with 20 pins, distinguishing it from SOIC or other package variants.

Replacement Considerations

MC74AC245DWG (SOIC-20 package)

FAQ

How is the direction of data flow determined?

The Transmit/Receive (T/R) input determines the direction. An active-HIGH state enables data flow from A ports to B ports, while an active-LOW state enables data flow from B ports to A ports.

What happens when the Output Enable (OE) input is HIGH?

When the OE input is HIGH, both A and B ports are disabled and placed in a High-Z condition, effectively isolating the transceiver from the bus.