The ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E, ISL31498E 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 protected against faults up to ±60V. 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 RS-485 family one of the most 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 network 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 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. See Table 1 on page 3 for key features and configurations by device number. For fault protected or wide common mode range devices with cable invert (polarity reversal) please see the ISL32485E datasheet.
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
- 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
- Pb-free (RoHS compliant)
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
Order Information| Part Number | Package Type | Weight(g) | Pins | MSL Rating | Peak Temp (°C) | RoHS Status |
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| ISL31491EIBZ | 8 Ld SOIC | 0.072 | 8 | 2 | 260 | RoHS |
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| ISL31491EIBZ-T | 8 Ld SOIC T+R | 0.072 | 8 | 2 | 260 | RoHS |
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| ISL31491EIBZ-T7A | 8 Ld SOIC T+R | 0.072 | 8 | 2 | 260 | RoHS |
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