MAX13450E/51E: RS-485 transceivers with software-/pin-configurable termination resistors allow remote network configuration

High-speed RS-485 networks require termination resistors at the end of each transmission line. This means that users must manually terminate the end-slave device through an external resistor or DIP switch each time they configure the network. By integrating switchable termination resistors, the MAX13450E/MAX13451E allow users to easily configure the network solely through software. This avoids the process of manual termination, thus enhancing RS-485 network scalability. Additionally, the integrated dual-termination resistors support both 24AWG and Cat 5/Cat 6 cables without the signal integrity problems associated with competitive solutions.

Both devices integrate a low-voltage logic interface (down to 1.62V) to support small-geometry ASICs/FPGAs without the need for additional parts. The MAX13451E has a fault alarm indicator to protect the system against driver errors, and the MAX13450E features a logic-inversion function to reverse the A-B signals in case they are connected incorrectly. Pin-selectable slew-rate limiting improves EMI performance, while robust ESD protection (±30kV, HBM*) and an automotive temperature range protect against harsh industrial environments.