特長
- IEC 61000-4-2 ESD protection on RS-485 I/O pins
- Air-gap discharge: ±15kV
- Contact discharge: ±8kV
- HBM Class 3B ESD level on all other pins: ±9kV
- IEC 61000-4-4 Electrical Fast Transient (EFT) protection on RS-485 I/O pins: ±5kV
- 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 or 5V supply
- Data rate: Up to 20Mbps
- Low quiescent supply current: 400μA (Typ.)
- Low shutdown (SHDN) current: < 0.6μA (Typ.)
- -7V to +12V common-mode input/output voltage range
- Full-duplex operation
説明
The RRA48356 is a ±15kV IEC 61000-4-2 ESD-protected, 3.3V to 5V powered single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. This device has very low bus currents (+125μA/-100μA), so it presents a true 1/8 unit load to the RS-485 bus. This allows up to 256 transceivers on the network without violating the RS-485 specification's 32-unit load maximum, and without using repeaters. For example, in a remote utility meter reading system, individual meter readings are routed to a concentrator using an RS-485 network, so the high allowed node count minimizes the number of repeaters required.
Hot plug circuitry ensures that the transmitter (Tx) and receiver (Rx) outputs remain in a high-impedance state while the power supply stabilizes.
Rx inputs feature a full fail-safe design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or terminated but undriven.
The RRA48356 is configured for full-duplex (separate Rx input and Tx output pins) applications.
パラメータ
| 属性 | 値 |
|---|---|
| Vcc (V) | 3.0-5.5 |
| Tx/Rx per Port | 1/1 |
| Half/Full Duplex | Full |
| Devices Allowed on Bus | 256 |
| ESD Standard | IEC 61000-4-2 |
| Data Rate RS-485/RS-232 | 20 |
| Temp. Range (°C) | -40 to +105°C |
製品比較
| RRA48356 | RRA48316 | RRA48326 | RRA48355 | |
| Half/Full Duplex | Full | Full | Full | Half |
| Data Rate RS-485/RS-232 | 20 | 0.25 | 1 | 20 |
| ESD Standard | IEC 61000-4-2 | IEC 61000-4-2 | IEC 61000-4-2 | IEC 61000-4-2 |
| Pkg. Type | MSOP, SOICN | MSOP, SOICN | MSOP, SOICN | MSOP, SOICN |
| Lead Count (#) | 10, 14 | 10, 14 | 10, 14 | 8 |
| Pkg. Dimensions (mm) | 3.0 x 3.0 x 0.85, 8.7 x 3.9 x 0.00 | 3.0 x 3.0 x 0.85, 8.7 x 3.9 x 0.00 | 3.0 x 3.0 x 0.85, 8.7 x 3.9 x 0.00 | 3.0 x 3.0 x 0.00, 4.9 x 3.9 x 0.00 |
アプリケーション
- Automated utility meter reading systems
- High node count systems
- Field bus networks
- Security camera networks
- Building environmental control/lighting systems
- Industrial/Process control networks
