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The Intersil ISL3178AE is ±15kV IEC61000 ESD protected, 3.3V-powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. This device has very low bus currents (+125µA/-100µA), which presents 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 via an RS-485 network, so the high allowed node count minimizes the number of repeaters required.

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.

Hot Plug circuitry ensures that the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes.

The ISL3178AE is a half duplex version. It multiplexes the Rx inputs and Tx outputs to allow transceivers with output disable functions in an 8 Ld package.

Key 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
• True 1/8 unit load allows up to 256 devices on the bus
• Single 3.3V supply
• High data rates: up to 10Mbps
• Low quiescent supply current: 800µA (max)
  • Ultra low shutdown supply current: 10nA
• -7V to +12V common mode input/output voltage range
• Half duplex pinouts
• Three state Rx and Tx outputs available
• Current limiting for driver overload protection
• 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