The MAX33070E/MAX33071E/MAX33074E are a family of fault-protected RS-485/RS-422 transceivers with high ±65V protection for overvoltage conditions on the communication bus lines, ensuring robust protection in harsh industrial environments. All devices have ±40V of common-mode range (CMR) within V_CCH (+4.5V to +5.5V), exceeding the RS-485 standard of -7V to +12V, making them suitable for electrically noisy environments where different systems have shifting ground levels relative to each other. They also incorporate a high ESD protection circuit capable of protecting against ±40kV of ESD Human Body Model (HBM) for driver outputs and receiver inputs (A and B data lines). Each device contains one driver and one receiver and operates over the +3V to +5.5V supply range, making it convenient for designers to use one part with either +3.3V or +5Vsupply voltages across multiple end equipment.

These devices feature a receiver enable active-low RE input that allows for a low-current shutdown state. The MAX33070E features slew-rate-limited outputs for data rates up to 500kbps. For applications requiring higher bandwidth, the MAX33071E is rated up to 2Mbps, and the MAX33074E up to 20Mbps. These transceivers are optimized for robust communication in noisy environments. A true fail-safe feature guarantees a logic-high on the receiver output when the inputs are open or shorted. Driver outputs are protected against short-circuit conditions. The receivers feature a 1/8-unit load input impedance, allowing up to 256 transceivers on a bus.

The MAX33070E/MAX33071E are available in an 8-pin SO, and the MAX33074E is available in an 8-pin SO with an exposed pad. All three devices operate over the -40°C to +125°C temperature range.

Applications

• Agriculture and Heavy Machinery
• Elevator Control
• Home and Building Automation
• Industrial Automation Equipment
• Motion Controllers
• Power Supply and UPS