The 54FCT245LMQB is an octal transceiver with three-state outputs. It is part of the FCT (Fast CMOS Technology) family of logic devices. Manufactured by National Semiconductor (now Texas Instruments), this transceiver is designed for high-speed, bi-directional data transfer between two buses. The direction of data flow is controlled by a direction control (DIR) input. The output enable (OE) input allows the outputs to be placed in a high-impedance state, effectively disconnecting the transceiver from the buses.

Applications

• High-speed data bus transceivers
• Memory interface circuits
• Bidirectional port isolation
• Microprocessor systems
• Digital signal processing
• Data acquisition systems

Features

• High-speed operation: tpd = 4.5 ns (typical)
• Bi-directional data transfer
• Three-state outputs
• Low power consumption
• TTL compatible inputs
• Output Enable control
• Direction control

Benefits

• Enables high-speed data transfer between two buses.
• Provides flexible data flow control.
• Allows for bus isolation when the outputs are disabled.
• Reduces power consumption in bus-oriented systems.
• Simplifies interface with TTL logic devices.
• Facilitates efficient bus management.

Additional Details

The 54FCT245LMQB is designed to operate with a supply voltage of 5V. The direction control (DIR) input determines the direction of data flow. When DIR is HIGH, data flows from A to B; when DIR is LOW, data flows from B to A. The output enable (OE) input must be LOW to enable the outputs. When OE is HIGH, the outputs are in a high-impedance state. The device is characterized for operation over the full military temperature range (-55°C to +125°C). The 54FCT245LMQB is available in a variety of packages, including DIP and surface mount packages.

The FCT series offers significant performance advantages over older logic families, such as the LS and HC series. The 54FCT245LMQB is a robust and versatile transceiver suitable for demanding applications where high-speed data transfer and flexible bus management are essential.