The MAX490ESA+ from Maxim Integrated is a high-performance, low-power transceiver designed for RS-485 and RS-422 communication applications. This device is particularly well-suited for long transmission lines due to its slew-rate-limited driver which reduces electromagnetic interference (EMI) and reflections caused by improperly terminated cables.
Key Features
- Low Quiescent Current: The MAX490ESA+ operates with a very low supply current, typically 300µA, making it ideal for power-sensitive applications.
- Single 5V Supply: This transceiver operates from a single 5V supply, simplifying power supply design.
- Slew-Rate Limitation: The device features a driver with a controlled slew rate, ensuring reduced EMI and eliminating the need for external slew rate control.
- Extended Temperature Range: With an operating temperature range of -40°C to +85°C, the MAX490ESA+ is suitable for industrial environments.
- Half-Duplex Communication: The transceiver supports half-duplex communication, allowing bidirectional communication over a single pair of wires.
- High Driver Output Capability: It can drive up to 32 transceivers on the bus, making it suitable for multi-point data transmission networks.
- ESD Protection: The MAX490ESA+ includes integrated protection against electrostatic discharge (ESD) events.
- Fail-Safe Receiver: The receiver ensures a logic-high output if the input is open circuit, shorted, or connected to a terminated transmission line without any signal present.
Applications
The MAX490ESA+ is versatile and can be used in a variety of applications including industrial control, building automation, factory automation, and any other systems that require robust data communication with noise immunity. Its low-power consumption and controlled driver output make it an excellent choice for battery-powered and remote systems.
Package Information
The device is available in an 8-pin NSOIC package, which offers a compact footprint for space-constrained applications. Its pin configuration is industry-standard, making it easy to integrate into existing designs or for use in new projects.
