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MAX3491AE：+3.3V-Powered, ±20kV ESD-Protected, 20Mbps and Slew-Rate-Limited RS-485/RS-422 Transceivers

High ESD protection increases robustness and reliability of industrial end equipment

Devices in the MAX3483AE family (MAX3483AE/MAX3485AE/MAX3488AE/MAX3490AE/MAX3491AE) are ±20kV ESD-protected RS-485/422 transceivers, optimized for extended cable runs in noisy environments. All devices operate from a single 3.3V supply. The MAX3483AE and MAX3485AE are half-duplex transceivers. The MAX3488AE, MAX3490AE, and MAX3491AE are full-duplex transceivers. All receivers feature a unit-load input impedance, allowing up to 32 devices on a single bus. Each transceiver includes a fail-safe receiver, ensuring that the receiver output (RO) is high when inputs are shorted, open, or connected to a tri-state bus. All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±20kV HBM ESD, ±15kV Air-Gap ESD and ± 8kV Contact ESD in accordance to IEC 61000-4-2. The MAX3483AE, MAX3485AE, MAX3488AE, and MAX3490AE are available in industry standard 8-pin SO package, while the MAX3491AE is available in a 14-pin SO package.

Key Features Integrated Protection Increases Robustness High ESD Protection ±20kV HBM ESD per JEDEC JS-001-2012 ±15kV Air Gap per IEC 61000-4-2 ±8kV Contact ESD per IEC 61000-4-2 Short-Circuit Protected Outputs True Fail-Safe Receiver Prevents False Transition on Receiver Input Short or Open Events Hot-Swap Capability Eliminates False Transitions During Power-Up or Hot Insertion High-Speed Data Rates up to 20Mbps Up to -40°C to +125°C Operating Temperature Allows Up to 128 Transceivers on the Bus

MAX3483AE, MAX3485AE, MAX3488AE, MAX3490AE, MAX3491AE: Functional Diagram Applications/Uses Industrial-Control Local Area Networks Telecommuncations Transceivers for EMI-Sensitive Applications

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