ADM3486E Datasheet

• TIA/EIA RS-485/RS-422 compliant
• ±15 kV ESD-protection on RS-485 input/output pins
• Data rates - ADM3486E: 2.5 Mbps
• Half duplex
• Receiver open-circuit, fail-safe design
• Low Power shutdown current
• 32 nodes on the bus
• Outputs high-Z when disabled or powered off
• −7 V to +12 V common-mode input range
• Thermal shutdown and short-circuit protection
• Industry-standard 75176 pinout
• 8-lead SOIC package

• Power/energy metering
• Telecommunications
• EMI-sensitive systems
• Industrial control
• Local area networks

The ADM3486E are 3.3 V low power data transceivers with ±15 kV ESD protection suitable for full and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with TIA/EIA standards RS-485 and RS-422. The ADM3486E are half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and receiver.

The devices have a 12 kΩ receiver input impedance which allows up to 32 transceivers on a bus. Since only one driver should be enabled at any time, the output of a disabled or powered down driver is three-stated to avoid overloading the bus. The driver outputs of the ADM3486E are slew rate limited, in order to reduce EMI and data errors caused by reflections from improperly terminated buses. The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating.

Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the commercial and industrial temperature ranges and are available in narrow 8-lead SOIC packages.