ISL32493E
±60V Fault Protected, 5V, RS-485/RS-422 Transceivers with ±25V CMR and ESD Protection

Key Features

• Fault Protected RS-485 Bus Pins: Up to ±60V
• Extended Common Mode Range: ±25V More than Twice the Range Required for RS-485
• ±16.5kV HBM ESD Protection on RS-485 Bus Pins
• 1/4 Unit Load for Up to 128 Devices on the Bus
• High Transient Overvoltage Tolerance: ±80V
• Full Fail-Safe (Open, Short, Terminated) RS-485 Receivers
• High Rx I_OL for Opto-Couplers in Isolated Designs
• Hot Plug Circuitry; Tx and Rx Outputs Remain Three-State During Power-Up/Power-Down
• Choice of RS-485 Data Rates: 250kbps to 15Mbps
• Low Quiescent Supply Current: 2.3mA
• Ultra Low Shutdown Supply Current: 10µA

Description

The ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, ISL32498E are fault protected, 5V powered, differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 transceiver pins (driver outputs and receiver inputs) are fault protected up to ±60V and are protected against ±16.5kV ESD strikes without latch-up. Additionally, the extended common mode range allows these transceivers to operate in environments with common mode voltages up to ±25V (>2x the RS-485 requirement), making this fault protected RS-485 family one of the most robust on the market.

Transmitters (Tx) deliver an exceptional 2.5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs or allows up to six 120Ω terminations in star network topologies.

Receiver (Rx) inputs feature a "Full Fail-Safe" design that ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. Rx outputs have high drive levels; typically, 15mA @ V_OL = 1V (for opto-coupled, isolated applications).

Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available. See Table 1 on page 2 for key features and configurations by device number.

For fault protected or wide common mode range RS-485 transceivers with cable invert (polarity reversal) pins, please see the ISL32483E data sheet.

Applications

• Utility Meters/Automated Meter Reading Systems
• High Node Count RS-485 Systems
• PROFIBUS™ and RS-485 Based Field Bus Networks, and Factory Automation
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks