±15kV ESD Protected, 3.3V, Full Fail-safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers The Intersil ISL317XE are ±15kV IEC61000 ESD Protected, 3.3V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. These devices have very low bus currents (+125μA/-100μA), so they present 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. Features • IEC61000 ESD Protection on RS-485 I/O Pins . . . . . ±15kV - Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM • Pb-Free Plus Anneal Available (RoHS Compliant) • 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 20Mbps • Low Quiescent Supply Current . . . . . . . . . . .800μA (Max) - Ultra Low Shutdown Supply Current . . . . . . . . . . .10nA • -7V to +12V Common Mode Input/Output Voltage Range • Half and Full Duplex Pinouts • Three State Rx and Tx Outputs Available • Current Limiting and Thermal Shutdown for driver Overload Protection • Tiny MSOP Packages Consume 50% Less Board Space 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