ISL3178AE
±15kV ESD Protected, 3.3V, Full Fail-Safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
Key Features
- 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 (Only Versions with Output Enable Pins)
- 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)
Description
The Intersil ISL3178AE is ±15kV IEC61000 ESD Protected, 3.3V-powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. This device has very low bus currents (+125mA/-100mA), 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.
Applications
- Automated Utility Meter Reading Systems
- High Node Count Systems
- Field Bus Networks
- Security Camera Networks
- Building Environmental Control/Lighting Systems
- Industrial/Process Control Networks
