MC74ACT245NG

Overview

The MC74ACT245NG is an octal bidirectional transceiver with three-state outputs manufactured by onsemi. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum propagation delay of 9.0 ns at 5.0 V. The device provides 24 mA source/sink current capability at both A and B ports, features TTL-compatible inputs, and functions within an ambient temperature range of -40°C to +85°C.

Feature Summary

• Non-inverting buffers ensure data consistency during transmission without altering logical states.
• Bidirectional data path allows flexible flow between A and B ports controlled by the T/R input.
• High drive capability enables connection to multiple loads via 24 mA output currents.
• TTL-compatible inputs facilitate seamless integration with legacy logic devices.

Applications

• Bus-oriented applications requiring high-speed data transfer
• Memory interface circuits for microprocessor systems
• Digital signal routing in communication equipment

Procurement Notes

Verify that the ordering suffix matches the required package type, as standard datasheets list DWG (SOIC-20) and DTG (TSSOP-20). Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer. Ensure the specific variant aligns with your board design requirements before finalizing orders.

Selection Notes

Select this component when TTL-level compatibility is necessary alongside CMOS performance. It is suitable for designs requiring robust drive strength and bidirectional control. Compare against AC series variants if lower voltage operation below 4.5 V is required, noting that ACT series inputs are optimized for 5 V logic levels.

Part Context

This part belongs to the MC74AC/ACT245 family of octal bus transceivers. It shares functional similarities with other 74-series logic devices but offers enhanced speed and drive capabilities typical of the Advanced CMOS Technology line. It serves as a critical interface component in digital systems managing parallel data buses.

Replacement Considerations

MC74ACT245DWG

FAQ

How does the Output Enable (OE) pin affect operation?

When OE is HIGH, both A and B ports are disabled and placed in a High-Z state, effectively disconnecting the transceiver from the bus regardless of the T/R input level.

What determines the direction of data flow?

The Transmit/Receive (T/R) input controls direction. Data flows from A to B when T/R is HIGH, and from B to A when T/R is LOW.