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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 @ V_OL = 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.

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

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