MC74AC245DTR2G

Overview

The MC74AC245DTR2G is an octal bidirectional transceiver with 3-state inputs and outputs, manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V. The device features non-inverting buffers with a propagation delay of up to 8.5 ns at 5.0 V. It provides balanced output source and sink currents of 24 mA at both A and B ports. The component is housed in a TSSOP-20 package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Bidirectional data path controlled by Transmit/Receive input
• High current drive capability of 24 mA at both ports
• Three-state outputs for bus-oriented applications

Applications

• Bus-oriented memory address driving
• TTL level bus oriented transceiver applications
• General purpose bidirectional data transfer

Procurement Notes

Verify the specific ordering suffix 'R2G' corresponds to the tape and reel packaging configuration required for automated assembly processes. Confirm that the TSSOP-20 package dimensions align with the target PCB footprint design constraints. Ensure compliance with RoHS directives as indicated by the Pb-Free designation in the official documentation.

Selection Notes

Select this component when designing systems requiring high-speed bidirectional data transfer between buses. The AC logic family offers faster switching speeds compared to standard variants. Verify that the system power supply remains within the 2.0 V to 6.0 V operational limits to ensure correct functionality and avoid exceeding maximum ratings.

Part Context

This part belongs to the MC74AC245 series of octal bidirectional transceivers. It shares functional similarities with the MC74ACT245, though the ACT variant includes TTL-compatible inputs. The DTR2G suffix specifically denotes the surface-mount TSSOP-20 package format supplied in a tape and reel configuration for manufacturing efficiency.

Replacement Considerations

MC74AC245DTG (Tube Packaging)

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 (high impedance) condition.