ISL4489EIBZ-T

The ISL4489E is ESD protected, “fractional”unit load, BiCMOS, 5V powered, single transceivers thatmeet both the RS-485 and RS-422 standards for balancedcommunication. Each driver output and receiver input isprotected against ±15kV ESD strikes, without latch-up.Unlike competitive versions, these Intersil devices arespecified for 10% tolerance supplies (4.5V to 5.5V).Rx inputs and Tx outputs present a “1/8 unit load” to theRS-485 bus, which allows a total of 256 transmitters andreceivers on the network for large node count systems.These devices are configured for full duplex (separate Rxinput and Tx output pins) applications, so they are ideal forRS-422 networks requiring high ESD tolerance on the buspins. The ISL4489E utilizes a slew rate limited driver whichreduces EMI, and minimizes reflections from improperlyterminated transmission lines, or unterminated stubs inmultidrop and multipoint applications. Data rates up to 15Mbps are achievable by using theISL4491E, which features higher slew rates.Receiver (Rx) inputs feature a “fail-safe if open” design,which ensures a logic high Rx output if Rx inputs are floating.Driver (Tx) outputs are short circuit protected, even forvoltages exceeding the power supply voltage. Additionally,on-chip thermal shutdown circuitry disables the Tx outputs toprevent damage if power dissipation becomes excessive.

• Pb-free Available as an Option (RoHS Compliant)
• RS-485 I/O Pin ESD Protection is ±15kV HBM - Class 3 ESD Level on all Other Pins is >7kV HBM
• 1/8 Unit Load Allows up to 256 Devices on the Bus
• High Data Rates (ISL4491E) is up to 15Mbps
• Slew Rate Limited Version for Error Free Data Transmission (ISL4489E)
• Very Low Quiescent Current:
  • 140µA (ISL4489E)
  • 370µA (ISL4491E)
• -7V to +12V Common Mode Input Voltage Range
• Three-State Rx and Tx Outputs
• Full Duplex Pinout
• Operates from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver Overload Protection