ISL3158AE
±16.5kV ESD (IEC61000-4-2) Protected, Large Output Swing, 5V, Full Fail-Safe, 1/8 Unit Load, RS-485/RS-422 Transceiver
Key Features
- High Driver VOD: 2.4V (Min) @ RD = 54Ω
- Better Noise Immunity, or Drive Up to 8 Terminations
- IEC61000 ESD Protection on RS-485 I/O Pins: ±16.5kV
- Class 3 ESD Level on all Other Pins: >7kV HBM
- Full Fail-safe (Open, Short, Terminated and Undriven) Receivers
- High Rx IOL to Drive Opto-Couplers for Isolated Applications
- Hot Plug Circuitry - Tx and Rx Outputs Remain Three-State During Power-up/Power-down
- True 1/8 Unit Load Allows up to 256 Devices on the Bus
- Specified for Single 5V, 10% Tolerance, Supplies
- High Data Rates: up to 10Mbps
- Low Quiescent Supply Current: 600µA Ultra Low Shutdown Supply Current: 70nA
- -7V to +12V Common Mode Input Voltage Range
- Half Duplex Pinouts
- Pb-free (RoHS compliant)
- Three-State Rx and Tx Outputs
- Current Limiting for Driver Overload Protection
Description
The ISL3158AE is a BiCMOS, IEC61000 ESD protected, 5V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. Each driver output and receiver input is protected against ±16.5kV ESD strikes without latch-up.
The ISL3158AE transmitter delivers exceptional differential output voltages (2.4V min), into the RS-485 required 54Ω load, for better noise immunity or to allow up to eight 120Ω terminations in "star" or other non-standard bus topologies. This device has very low bus currents (+125µA/-75µA), 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.
Receiver (Rx) inputs feature a "Full Fail-Safe" design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven bus. Rx outputs feature high drive levels - typically 28mA @ VOL = 1V (to ease the design of optocoupled isolated interfaces).
Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state until the power supply has stabilized, and the Tx outputs are fully short circuit protected.
The ISL3158AE 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
- Utility Meters and Automated Meter Reading Systems
- High Node Count Systems
- PROFIBUS® and Field Bus Networks, and Factory Automation
- Security Camera Networks
- Building Lighting and Environmental Control Systems
- Industrial/Process Control Networks
