SN74ALS640B-1DWR - Texas Instruments

The SN74ALS640B-1DWR is a high-performance, octal bus transceiver from Texas Instruments, designed with bi-directional data communication in mind. This integrated circuit is part of the Advanced Low-Power Schottky (ALS) series, which is recognized for its balance between speed and power consumption, making it a suitable choice for interfacing between different logic families or driving heavy loads.

Key Features:

• Logic Type: Octal Bus Transceiver with 3-state outputs
• Directionality: Bi-Directional
• Operating Voltage Range: 4.5V to 5.5V
• Output Current: -24mA / 24mA
• Data Rate: High-speed data transfer capabilities
• Package: SOIC-20 Wide Body (DWR suffix)

The device features eight D-type flip-flops that allow for the transmission of data from the A bus to the B bus and vice versa, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can disable the device so that the buses are effectively isolated.

With a typical propagation delay time of just 6ns and a setup time of 3ns, the SN74ALS640B-1DWR ensures swift and reliable data transfer, which is essential for modern digital applications. Moreover, the low-power Schottky circuitry limits power dissipation, yet does not compromise on the switching speeds, which is a hallmark of the ALS logic family.

This transceiver is designed to drive capacitive loads of up to 50pF with ease, which makes it highly versatile for a range of applications, including memory address driving, data transmission systems, and bidirectional bus-oriented systems. Its wide-body SOIC-20 package allows for efficient PCB (Printed Circuit Board) space utilization and is suitable for automated surface-mount assembly processes.

For those looking to integrate the SN74ALS640B-1DWR into their designs, Texas Instruments provides extensive technical support, including datasheets, reference designs, and application notes to ensure a smooth integration process.