The SN54LS242J is a quad bus transceiver with 3-state outputs from Rochester Electronics. It is part of the 54LS series of low-power Schottky TTL logic devices, offering a balance of speed and power consumption for various digital applications.

Applications

• Bidirectional data bus buffering.
• Memory address decoding.
• Peripheral interface circuits.
• Line driving and receiving.
• Data multiplexing and demultiplexing.
• General-purpose logic circuits.

Features

• Quad Transceiver: Contains four independent transceiver channels for bidirectional data transfer.
• 3-State Outputs: Provides high-impedance output state for bus isolation and multiplexing.
• Low Power Schottky: Offers a good balance of speed and power consumption compared to standard TTL devices.
• High Noise Immunity: Provides reliable operation in noisy environments.
• Operating Temperature Range: Specified for operation over the military temperature range (-55°C to +125°C).
• J Package: Hermetically sealed ceramic DIP package for enhanced reliability and environmental protection.

Benefits

• Bidirectional Data Transfer: Allows data to flow in both directions across a common bus.
• Bus Isolation: 3-state outputs enable easy isolation of devices from the bus when not actively transmitting or receiving data.
• Reduced Power Consumption: Low Power Schottky technology minimizes power dissipation, reducing heat generation and improving energy efficiency.
• Enhanced Reliability: Ceramic package provides excellent protection against environmental factors, ensuring long-term reliability.
• Military Temperature Range: Suitable for demanding applications requiring operation over a wide temperature range.

Additional Details

The SN54LS242J features separate direction control inputs for each transceiver channel, allowing for independent control of data flow. The output enable inputs control the 3-state outputs, enabling the device to be disconnected from the bus when necessary. It operates from a standard 5V power supply. As a part from the 54LS family, it features faster switching speeds than standard TTL and lower power consumption. The "J" suffix indicates a ceramic DIP package, ideal for environments where high reliability is crucial. This part is commonly used in older military and aerospace applications where the wide temperature range and robust packaging are required. Understanding the datasheet for proper voltage levels and timing diagrams is critical for proper operation.