High ESD Protected, +125°C, 40Mbps, 3.3V, Full Fail-Safe RS-485/RS-422 Transceivers

The ISL3179E and ISL3180E are high ESD protected (see Table 2 on page 2), 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.

Features
• 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)

Applications
• Motor controller/position encoder systems
• Factory automation
• Field bus networks
• Security networks
• Building environmental control systems
• Industrial/process control networks