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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 at 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.

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 IOL 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

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