Intersil's ISL3159E - ¡À15kV ESD Protected, +125¡ãC, 40Mbps, 5V, PROFIBUS®, Full Fail-safe, RS-485/RS-422 Transceivers

Intersil¡¯s ISL3159E is a ¡À15kV IEC61000 ESD Protected, 5V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. It also features the larger output voltage and higher data rate - up to 40Mbps - required by high speed PROFIBUS applications, and is offered in Industrial and Extended Industrial (-40¡ãC to +125¡ãC) temperature ranges. The low bus currents (+220¦ÌA/-150¦ÌA) present a ¡°1/5 unit load¡± to the RS-485 bus, thus allowing up to 160 transceivers on the network without violating the RS-485 specification¡¯s load limit, and without using repeaters.

This transceiver requires a 5V ¡À10% tolerance supply, and delivers at least a 2.1V differential output voltage over this supply range. This translates into better noise immunity (data integrity), longer reach, or the ability to drive up to six 120¦¸ terminations in ¡°star¡± or other non-standard bus topologies, at the exceptional 40Mbps data rate.

SCSI applications benefit from the ISL3159¡¯s low receiver and transmitter part-to-part skews, which make it perfect for high speed parallel applications where large numbers of bits must be simultaneously captured. The low bit-to-bit skew eases the timing constraints on the data latching signal.

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. Rx outputs feature high drive levels (typically >30mA @ V_OL = 1V) to ease the design of optically isolated interfaces.

Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes. Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage. Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive.

• IEC61000 ESD Protection on RS-485 I/O Pins ¡À15kV
  • Class 3 HBM ESD Level on all Other Pins >9kV
• Large Differential V_OUT 2.8V into 54¦¸ Better Noise Immunity, or drive up to 6 Terminations
• High Data Rates up to 40Mbps
• Specified for +125¡ãC Operation
• 11/13ns (Max) Tx/Rx Propagation Delays; 1.5ns (Max) Skew
• 1/5 Unit Load Allows up to 160 Devices on the Bus
• Full Fail-Safe (Open, Shorted, Terminated/Undriven) Receiver
• High Rx IOL to Drive Opto-Couplers for Isolated Applications
• Hot Plug - Tx and Rx Outputs Remain Three-State During Power-Up
• Low Quiescent Supply Current 4mA
• Low Current Shutdown Mode 1¦ÌA
• -7V to +12V Common Mode Input Voltage Range
• Three-State Rx and Tx Outputs
• Operates from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver Overload Protection
• Pb-Free Plus Anneal Available (RoHS Compliant)