74ACT245PC

Buffers, Drivers, Receivers, Transceivers Overview

The Fairchild Semiconductor 74ACT245PC is an octal bidirectional transceiver featuring three-state outputs, designed for bus-oriented applications. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a propagation delay of 9 ns at 5 V with a 50 pF load. The device provides high current drive capabilities, sourcing and sinking 24 mA on both ports. It utilizes a 20-pin DIP package and functions as a non-inverting buffer for two-way asynchronous communication between data buses.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bidirectional data path controlled by Transmit/Receive input
• Three-state outputs allowing connection to system buses
• TTL-compatible input levels for seamless interfacing

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented memory and I/O systems
• Two-way asynchronous communication between data buses
• Level conversion from TTL or NMOS outputs to High Speed CMOS inputs

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific manufacturer origin, as ON Semiconductor acquired Fairchild's logic business. Confirm that the part number suffix 'PC' corresponds to the standard 20-pin DIP package. Ensure compliance with RoHS directives if required for the target application, noting that older stock may vary in environmental certification status.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal bus transceiver with TTL-compatible inputs is required. It is suitable for designs needing 24 mA output drive strength and operation within the 4.5 V to 5.5 V voltage range. Consider the DIP package constraint for through-hole mounting requirements compared to surface-mount alternatives.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the 74ACT logic family, which combines the speed of Advanced Schottky TTL with the low power consumption of CMOS technology. It is functionally pin-compatible with other 245-type transceivers like the 74HC245 and 74LS245, facilitating upgrades or replacements in existing circuit designs without layout changes.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

MC74ACT245DWR2G (onsemi)

Buffers, Drivers, Receivers, Transceivers FAQ

What determines the direction of data flow?

The Transmit/Receive (T/R) input determines the direction. A high level enables data flow from Port A to Port B, while a low level enables flow from Port B to Port A.

How does the Output Enable pin function?

The Output Enable (OE) pin is active-low. When driven high, it places all I/O ports into a high-impedance state, effectively disconnecting them from the bus.