ISL31472EIBZ-T

The ISL31470E, ISL31472E, ISL31475E, and ISL31478E are fault protected, extended common- mode range differential transceivers that exceed the RS- 485 and RS- 422 standards for balanced communication. The RS- 485 bus pins (driver outputs and receiver inputs) are protected against overvoltages up to ± 60V. Additionally, these transceivers operate in environments with common- mode voltages up to ± 15V (exceeds the RS- 485 requirement), making this RS- 485 family one of the more robust on the market. Transmitters deliver an exceptional 2.5V (typical) differential output voltage into the RS- 485 specified 54Q load. This yields better noise immunity than standard RS- 485 ICs, or allows up to six 120Q terminations in star topologies. The receiver (Rx) inputs feature a Full Fail- Safe design that ensures a logic high Rx output if the Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. The Rx outputs feature high drive levels - typically 15mA at V₀L = 1V (to ease the design of opto- coupled isolated interfaces). Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available.

Applications

• Utility meters/automated meter reading systems
• High node count systems
• PROFIBUS and field bus networks, and factory automation
• Security camera networks
• Building lighting and environmental control systems
• Industrial/process control networks

Key features

• Fault protected RS-485 bus pins up to ± 60V
• Extended common-mode range, ± 15V larger than required for RS-485
• 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 I₀L 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
• Pb-free (RoHS compliant)