±15kV ESD Protected, 3.3V, Full Fail-Safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

The Intersil ISL317xE are ±15kV IEC61000 ESD protected, 3.3V powered single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. These devices have very low bus currents (+125mA/-100mA), so they present a true “1/8 unit load” to the RS-485 bus. This allows up to 256 transceivers on the network without violating the RS-485 specification’s 32 unit load maximum, and without using repeaters. For example, in a remote utility meter reading system, individual meter readings are routed to a concentrator using an RS-485 network, so the high allowed node count minimizes the number of repeaters required.

Features

• IEC61000 ESD protection on RS-485 I/O pins . . . . ±15kV

- Class 3 ESD level on all other pins . . . . . . . >7kV HBM

• Full fail-safe (open, short, terminated/floating) receivers

• Hot plug - Tx and Rx outputs remain three-state during

power-up (only versions with output enable pins)

• True 1/8 unit load allows up to 256 devices on the bus

• Single 3.3V supply

• High data rates. . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps

• Low quiescent supply current. . . . . . . . . . . . .800µA (Max)

- Ultra low shutdown supply current . . . . . . . . . . . . .10nA

• -7V to +12V common-mode input/output voltage range

• Half and full duplex pinouts

• Three state Rx and Tx outputs available

• Current limiting and thermal shutdown for driver overload protection

• Tiny MSOP packages consume 50 less board space

• Pb-free (RoHS compliant)

Applications

• Automated utility meter reading systems

• High node count systems

• Field bus networks

• Security camera networks

• Building environmental control/lighting systems

• Industrial/process control networks