SP3485EN(UMW)

The SP3485EN is a half-duplex, low-power RS-485 transceiver powered by 3.3V, fully compliant with TIA/EIA-485 standard requirements. The SP3485EN integrates one driver and one receiver, both of which can be independently enabled and disabled. When both are disabled, the driver and receiver outputs enter a high-impedance state. The SP3485EN features 1/8 unit load, allowing up to 256 SP3485EN transceivers to be connected on the same communication bus. Error-free data transmission at up to 12Mbps can be achieved. The SP3485EN operates over a supply voltage range of 3.0 to 3.6V, with built-in fault protection, over-temperature protection, current limiting protection, and overvoltage protection.

Applications

• Bus Networking: The SP3485EN RS485 transceiver is designed for bidirectional data communication on multipoint bus transmission lines. These devices can also be used as line repeaters for cable lengths exceeding 4000 feet.
• Daisy-Chain Networking: Also known as daisy-chain topology, this is the standard and recommended RS485 bus wiring topology endorsed by organizations such as TIA. This wiring method offers advantages of low signal reflection and high communication success rate.
• Bus Port Protection: In harsh environments, RS485 communication ports typically require ESD, lightning strike, and surge protection, and may even need protection against 380V power input to prevent damage to smart meters and industrial control hosts.

Key features

• 3.3V supply, half-duplex
• 1/8 unit load, supports up to 256 devices on bus
• Driver output short-circuit protection
• Over-temperature protection
• Low-power shutdown
• Receiver open-circuit protection
• High noise immunity
• Integrated transient voltage suppression
• Data rates up to 12Mbps in electrically noisy environments