The MAX33250E and MAX33251E are isolated 2Tx/2Rx and 1Tx/1Rx RS-232 transceivers, respectively, with a galvanic isolation of 600VRMS (60sec) between the logic UART side and field side. The isolation barrier protects the logic UART side from electrical transient strikes from the field side. It also breaks ground loops and large differences in ground potentials between the two sides that can potentially corrupt the receiving and sending of data. The MAX33250E and MAX33251E conform to the EIA/TIA-232E standard and operate at data rates up to 1Mbps.

The isolated RS-232 transceivers have integrated charge pumps and an inverter to eliminate the need for a high positive and negative voltage supply. Both devices also have integrated charge pump and inverter capacitors to help further reduce PCB space. The supply pin VCCA on the UART logic side operates from a dual voltage supply from +3V to +5.5V. VCCB also operates from +3V to +5.5V, simplifying power requirements and enabling level translation between the two voltages. The transmitters and receivers on the field side of these devices are rated for ±15kV of ESD HBM protection, suitable for applications where RS-232 cables are frequently worked on.

Both are available in a 12-pin, 6mm x 6mm LGA package and operate over the -40°C to +85°C temperature range.

Features and Benefits

High Integration Saves Space and Simplifies Designs
Integrated Charge Pumps and Inverter Eliminates Extra Power Supplies
Four Internal Capacitors Saves PCB Space
Integrated Isolator Saves Up to 63% Versus a Discrete Solution
Integrated Protection for Robust Communications
600VRMS Withstand Isolation Voltage for 60 Seconds (VISO)

Parameter Name	Parameter Value
Network	RS232
Applications	data transmission telemetry
Other characteristics	IC