The ISL3259E is a ±15kV 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 100Mbps) required by high speed PROFIBUS applications. The low bus currents (+220μA/-150μA) present a 1/5 unit load to the RS-485 bus. This allows 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 supply, and delivers at least a 2. 1V differential output voltage. This translates into better noise immunity (data integrity), longer reach, or the ability to drive up to six 120Ω terminations in “star” or other non-standard bus topologies. SCSI applications benefit from the ISL3259E’s low receiver and transmitter part-to-part skews. The ISL3259E is perfect for high speed parallel applications requiring simultaneous capture of large numbers of bits. 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 @ VOL = 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: ±15kV
  • Class 3 HBM ESD level on all other pins: >9kV
  • Large differential VOUT: 2.8V into 54Ω Better noise immunity, or drive up to 6 terminations
  • Very high data rate: up to 100Mbps
  • 11/13ns (maximum) Tx/Rx propagation delays; 1.5ns (maximum) 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: 1μA
  • -7V to +12V common mode input voltage range
  • Three-State Rx and Tx outputs
  • Operates from a single +5V supply
  • Current limiting and thermal shutdown for driver overload protection
  • Pb-free (RoHS compliant)



  • PROFIBUS® DP and FMS Networks
  • SCSI "Fast 40" Drivers and Receivers
  • Motor Controller/Position Encoder Systems
  • Factory Automation
  • Field Bus Networks
  • Security Networks
  • Building Environmental Control Systems
  • Industrial/Process Control Networks


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Design & Development



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IBS 32 KB Model - IBIS
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