ISL32452EIBZ-T

The ISL32470E, ISL32472E, ISL32475E, and ISL32478E 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 fault protected against overvoltages up to ±60V and are protected against ±16.5kV ESD strikes without latch-up. Additionally, these transceivers operate in environments with common-mode voltages up to ±15V (exceeds the RS-485 requirement), making this fault-protected RS-485 family one of the most robust on the market. The 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 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 and automated meter reading systems
• High node count RS-485 systems
• PROFIBUS and RS-485 based field bus networks, 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
• ±16.5kV HBM ESD protection on RS-485 bus pins
• High transient over-voltage 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
• RS-485 data rates... 250kbps to 15Mbps
• Low quiescent supply current... 3mA
• Ultra low shutdown supply current... 10μA