特性
- Fault protected RS-485 bus pins: up to ±60V
- Extended common-mode range: ±20V larger than required for RS-485
- ±15kV HBM ESD protection on RS-485 bus pins
- Wide supply range: 3V to 5.5V
- Cable invert pin (ISL32457E and ISL32459E only) corrects for reversed cable connections while maintaining Rx full fail-safe functionality
- 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
- Choice of RS-485 data rates: up to 20Mbps
- Low quiescent supply current: 2.1mA
描述
The ISL3245xE are 3. 3V to 5V powered, fault protected, extended Common-Mode Range (CMR) differential transceivers for balanced communication. The RS-485 bus pins (driver outputs and receiver inputs) are protected against overvoltages up to ±60V, and against ±15kV ESD strikes. These transceivers operate in environments with common-mode voltages up to ±20V (exceeds the RS-485 requirement), making this RS-485 family one of the most robust on the market. The transmitters are RS-485 compliant with VCC ≥ 4. 5V and deliver a 1. 1V differential output voltage into the RS-485 specified 54Ω load even with VCC = 3V. 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 full fail-safe operation is maintained even when the Rx input polarity is switched (cable invert function on ISL32457E and ISL32459E). The ISL32457E and ISL32459E include a cable invert function that reverses the polarity of the Rx and Tx bus pins in case the cable is misconnected during installation.
产品参数
| 属性 | 值 |
|---|---|
| Transmitters (#) | 1 |
| Receivers (#) | 1 |
| Fault Voltage Level (±V) | 60 |
| Common Mode Input Range (V) | - |
| Devices Allowed on Bus | 128 |
| Half/Full Duplex | Half |
| Cable Invert | Yes |
| High ESD Protection | Yes |
| Hot Plug | No |
| Data Rate (Mbps) | 0.25 |
| Supply Voltage Vcc Range | 3.0-5.5 |
| Slew Rate Limited | Yes |
| Tx/Rx Enable | Yes |
| Supply Current Icc (µA) | 2.1 |
| SHDN ICC | 10 µA |
应用方框图
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工业称重秤
适合高精度或便携式低功耗应用场景的精准且可扩展的工业称重秤。
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可连接 EtherCAT 和 CAN 的质量流量控制器
质量流量控制器（MFC）可以进行质量和流量测量，可用于控制半导体制造设备中的燃气。
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其他应用
- Utility Meters/Automated Meter Reading Systems
- Air Conditioning Systems
- Security Camera Networks
- Building Lighting and Environmental Control Systems
- Industrial/Process Control Networks