ISL31475E
Fault Protected, Extended Common Mode Range, RS-485/RS-422 Transceivers
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 Over Voltage 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
- Pb-Free (RoHS Compliant)
Description
The ISL31470E, ISL31472E, ISL31475E, 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 54Ω load. This yields better noise immunity than standard RS-485 ICs, or allows up to six 120Ω terminations in star topologies.
Receiver (Rx) inputs feature a Full Fail-Safe design which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. Rx outputs feature high drive levels - typically 15mA @ VOL = 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.
For an RS-485 family with a ±25V extended common mode range, please see the ISL31490E and ISL31480E data sheets.
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
