ADM3491 Datasheet

• Operate with 3.3 V supply 
• Interoperable with 5 V logic 
• EIA RS-422 and RS-485 compliant over full common-mode range 
• Data rate options: 10 Mbps 
• Half- and full-duplex options 
• 2 nA supply current in shutdown mode 
• Up to 32 transceivers on the bus 
• −7 V to +12 V bus common-mode range 
• Specified over the –40°C to +85°C temperature range 
• 8 ns skew 
• 14-lead SOIC packages 

• Low power RS-485/RS-422 applications
• Telecom
• Industrial process control
• HVAC 

The ADM3491 is a low power differential line transceiver designed to operate using a single +3.3 V power supply. Low power consumption coupled with a shutdown mode make it ideal for power sensitive applications. It is suitable for communication on multipoint bus transmission lines.

The ADM3491 feature full-duplex communication.

The ADM3491 transmit at up to 10 Mbps. The receiver input impedance is 12 kΩ, allowing up to 32 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. If a significant temperature increase is detected in the internal driver circuitry during fault conditions, then the thermal shutdown circuit forces the driver output into a high impedance state. If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state. The parts are fully specified over the commercial and industrial temperature ranges. The ADM3491 is available in a 14-lead SOIC_N.