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600V Isolated 2Tx/2Rx and 1Tx/1Rx RS-232 Transceiver with ±15kV ESD and Integrated Capacitors

Industry’s Smallest RS-232 Isolated Solution with Integrated Capacitors

Product Details

Parametric specs for RS-232 Line Driver/Receivers
# Rx 2
# Tx 2
VSUPPLY (V) 3 to 5.5
Data Rate (kbps) (min) 1000
ICC (mA) (typ) 10
Internal Charge Pump Yes
External Caps 0
ESD Protect. (±kV) 15
Isolation (±kV) 600
Package/Pins THIN LGA/12
Budgetary
Price (See Notes)
6.39
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Parameters

Parametric specs for RS-232 Line Driver/Receivers
# Rx 2
# Tx 2
VSUPPLY (V) 3 to 5.5
Data Rate (kbps) (min) 1000
ICC (mA) (typ) 10
Internal Charge Pump Yes
External Caps 0
ESD Protect. (±kV) 15
Isolation (±kV) 600
Package/Pins THIN LGA/12
Budgetary
Price (See Notes)
6.39

Key Features

  • 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)
    • 200VRMS Working Voltage for >50 years (VIOWM)
    • Integrated ±15kV ESD Human Body Model (HBM)

Applications/Uses

  • Communication Systems
  • Diagnostics Equipment
  • GPS Equipment
  • Industrial Equipment
  • Medical Equipment
  • POS Systems

Description

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.

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Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .