The DM74F243PC is a Quad Bus Transceiver with 3-STATE Outputs from National Semiconductor (now Texas Instruments). It is designed for asynchronous two-way communication between data buses. The device features four independent channels, each capable of transmitting data in either direction. It is commonly used in memory systems, I/O interfaces, and other data transfer applications.

Applications:

• Memory systems
• I/O interfaces
• Data bus isolation
• Bidirectional data transfer
• Peripheral interfaces

Features:

• Quad bidirectional transceivers in a single package
• 3-STATE outputs for bus isolation
• High-speed operation: tpd = 4.5 ns (typical)
• Low power consumption
• TTL compatible inputs
• Output drive capability: 15 LSTTL loads

Benefits:

• Simplifies bus interface design by providing four transceivers in one package.
• Allows for bidirectional data transfer between buses.
• Enables bus isolation when not transmitting data, preventing bus loading.
• Facilitates high-speed data communication.
• Minimizes power consumption, making it suitable for various applications.
• Ensures compatibility with standard TTL logic levels.
• Reduces component count, saving board space and cost.

Additional Details:

The DM74F243PC is available in a PDIP (Plastic Dual In-line Package). Each transceiver has an output enable (OE) input that controls the 3-STATE outputs. When OE is low, the transceiver is enabled and data can be transferred. When OE is high, the outputs are in a high-impedance state, effectively disconnecting the transceiver from the bus. The device operates over a temperature range of 0°C to +70°C. It is a member of the FAST (Fairchild Advanced Schottky TTL) logic family, known for its high speed and low power consumption. The direction of data transfer is controlled by a separate direction (DIR) input for each transceiver. A high level on the DIR input selects data transfer from A to B, while a low level selects data transfer from B to A.