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