The ISL3179EFBZ-T7A and ISL3180E are high ESD protected, 3.3V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Each device has low bus currents (+220μA/-150μA), so they 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 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 terminated but undriven.The ISL3180E is configured for full duplex applications. The ISL3179EFBZ-T7A half duplex version multiplexes the Rx inputs and Tx outputs to allow a transceiver with an output disable function in 8 Ld packages.Hot plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes.
Feature
- High ESD protection on RS-485 I/O pins
- ISL3179E: ±16.5kV IEC61000
- ISL3180E: ±12kV HBM
- Class 3 HBM level on all other pins (ISL3179E): >9kV
- Specified for +125°C operation
- High data rates: up to 40Mbps
- 5V tolerant logic inputs
- 1/5 unit load allows up to 160 devices on the bus
- Full fail-safe (open, shorted, terminated/undriven) receiver
- Hot plug - Tx and Rx outputs remain three-state during power-up
- Low quiescent current: 4mA (max)
- Low current shutdown mode: 1μA (max)
- -7V to +12V common-mode input voltage range
- Three-state Rx and Tx outputs
- 16/16.5ns (max) Tx/Rx propagation delays; 1.5ns (max) skew
- Operates from a single +3.3V supply (10% tolerance)
- Current limiting and thermal shutdown for driver overload protection
- Pb-free (RoHS compliant)
