特性
- IEC 61000 ESD protection on RS-485 I/O pins: ±16.5kV
- Class 3 ESD level on all other pins: >7kV HBM
- ±3kV EFT immunity of bus I/O pins
- Full fail-safe (open, short, terminated/floating) receivers
- Hot plug - Tx and Rx outputs remain three-state during power-up
- True 1/8 unit load allows up to 256 devices on the bus
- Single 3.3V supply
- High data rates: up to 250Kbps
- Low quiescent supply current: 800μA (Max)
- Ultra-low shutdown supply current: 10nA
- -7V to +12V common-mode input/output voltage range
- Half and full duplex pinouts
- Current limiting and thermal shutdown for driver overload protection
- Tiny MSOP packages consume 50% less board space
- Pb-free (RoHS compliant)
描述
The RAA788172 3V half-duplex powered RS-485/RS-422 transceiver features a high output drive and high EFT and ESD protection. The device is immune to ±3kV IEC 61000-4-4 EFT transients and can withstand up to ±16.5kV IEC 61000-4-2 ESD strikes without latch‑up.
The RAA78817x family includes half and full-duplex transceivers with active-high driver-enable pins and active-low receiver-enable pins. These transceivers support data rates of 250kbps, 500kbps, and 20Mbps with a performance that is characterized from -40 °C to +85 °C.
产品参数
| 属性 | 值 |
|---|---|
| Transmitters (#) | 1 |
| Receivers (#) | 1 |
| Devices Allowed on Bus | 256 |
| Half/Full Duplex | Half |
| Supply Voltage Vcc Range | 3.0 to 3.6 |
| High ESD Protection | Yes-EFT Immunity |
| Hot Plug | Yes |
| Data Rate (Mbps) | 0.25 |
| Slew Rate Limited | Yes |
| Tx/Rx Enable | Yes |
| IS Enabled/Disabled | 510/480 µA |
| SHDN ICC | 0.01 µA |
| VL Pin | No |
| Advanced Features | Ruggedized |
应用
- Industrial networks in factory automation
- Building automation: lighting, elevators, HVAC
- Industrial process control networks
- Security camera networks
- Networks with a star topology
- Long-haul networks in coal mines and oil rigs
- High node-count networks
- Automated utility e-meter reading systems
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Overview of the key features, advantages and target applications for the RAA78817x family of 3.3V RS-485/422 transceivers with +/-3kV EFT immunity and the RAA78815x family of 5V RS-485/422 transceivers with +/-5KV EFT immunity.