MC74AC245DTR2

Overview

The MC74AC245DTR2G is an octal bidirectional transceiver with 3-state outputs from the onsemi 74AC logic family. It operates within a supply voltage range of 2.0 V to 6.0 V and supports a maximum propagation delay of 8.5 ns at 3.3 V. The device provides high current sinking and sourcing capabilities of 24 mA at both A and B ports. It features non-inverting buffers controlled by Transmit/Receive (T/R) and Output Enable (OE) inputs, allowing data flow direction control or high-impedance state activation.

Feature Summary

• Bidirectional data path with non-inverting buffer functionality
• High current drive capability of 24 mA at both A and B ports
• Three-state outputs for bus-oriented applications

Applications

• Bus-oriented data transmission systems
• Memory and memory interface controllers
• Clock drivers and buffered oscillators

Procurement Notes

Verify the specific ordering suffix 'R2' against official documentation to confirm tape and reel packaging specifications. Ensure the component matches the required TSSOP-20 package dimensions and lead-free status indicated by the 'G' suffix in standard part numbers. Confirm that the operating temperature range aligns with system requirements before finalizing procurement.

Selection Notes

Select this component when designing systems requiring octal bidirectional data transfer with high drive strength. The 74AC series offers faster switching speeds compared to HC counterparts while maintaining CMOS compatibility. Consider the 24 mA output current capability for driving heavy loads directly without additional buffering stages.

Part Context

This component belongs to the MC74AC245 family of octal bidirectional transceivers manufactured by onsemi. It is designed for use in bus-oriented applications where data needs to be transferred between two buses. The AC series provides performance improvements over older logic families, making it suitable for modern digital systems requiring efficient data routing.

Replacement Considerations

MC74AC245DTG

FAQ

How is the data flow direction controlled?

Data flow direction is determined by the Transmit/Receive (T/R) input. An active-HIGH T/R enables data flow from A ports to B ports, while an active-LOW T/R 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, effectively isolating the device from the bus.