ISL32492EIBZ

ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, and 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 (CMR) allows these transceivers to operate in environments with common-mode voltages up to ±25V (more than twice the range required for RS-485), 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 network 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 have high drive levels; typically, 15mA at VOL=1V (for opto-coupled, isolated applications). 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 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

Key features

• Fault protected RS-485 bus pins up to ±60V
• Extended CMR ±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