特性
- IEC61000 ESD protection on RS-485 I/O pins: ±15kV
- Class 3 ESD level on all other pins: >7kV HBM
- 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 10Mbps
- Low quiescent supply current: 800µA (max)
- Ultra low shutdown supply current: 10nA
- -7V to +12V common mode input/output voltage range
- Half duplex pinouts
- Three state Rx and Tx outputs available
- Current limiting for driver overload protection
- Pb-free (RoHS compliant)
描述
Support is limited to customers who have already adopted these products.
The Intersil ISL3178AE is ±15kV IEC61000 ESD protected, 3. 3V-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), which 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 via an RS-485 network, so the high allowed node count minimizes the number of repeaters required. Receiver (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. Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes. The ISL3178AE is a half duplex version. It multiplexes the Rx inputs and Tx outputs to allow transceivers with output disable functions in an 8 Ld package.
应用
- Automated utility meter reading systems
- High node count systems
- Field bus networks
- Security camera networks
- Building environmental control/ lighting systems
- Industrial/process control network
