RS-485, RS-422 & RS-232

Intersil has a rich interface history dating back to the 1970’s. Our RS-485 and RS-422 transceivers are used by the biggest names in industrial process control, telecommunications, and hundreds of different applications.

Six ways Intersil enhances your RS-485 serial port

1. Enhanced ESD Protection:

IEC61000 ESD, wide differential voltage, and full failsafe to protect your data port.

+ More about ESD protection
See high ESD products »

2. Fault protected:

Over Voltage Protected for DC faults that will damage the devices on the bus.

+ More about fault protection
See fault protected products »


3. High Speed:

Data rates from 40Mbps to 100Mbps for ultra-fast data transfer.

+ More about high speed transceivers
See high speed products »

4. Low Power:

Operation down to 1.8v supply for remote or battery operated apps.

+ More about low power transceivers
See low power products »


5. Low cost:

Basic feature operating off of 5V and 3.3V supply.

+ More about low cost transceivers
See low cost products »

6. Multi-protocol:

Selectable RS-485 and RS-232 ports in one package.

+ More about multi-protocol transceivers
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Featured Products

ISL3172E: 3.3V Half Duplex, RS-485/RS-422 Transceiver

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. More »


ISL32492E, ISL32495E, ISL32498E: 5V, RS-485/RS-422 Transceivers More »

ISL3330: 3.3V, ±15kV ESD Protected, RS-232/RS-485 Transceivers

These devices are BiCMOS interface ICs that are user configured as either a single RS-422/RS-485 differential transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver. More »


ISL32613E, ISL32614E: ±16.5kV ESD Protected, +125°C, 1.8V to 3.6V, Low Power, SOT-23, RS-485/RS-422 Transmitter More »


Selecting the Right RS-485 Family for your Application

IEC61000 Enhanced ESD Protection

Full featured transceivers include improved ESD protection on bus pins that connect to an exposed port on a piece of equipment. Exposure makes the port susceptible to ESD events. Even connecting a charged interface cable could destroy an unprotected transceiver.

ESD protection falls under two standards: Human Body Model (HBM) standard and the IEC61000-4-2 (IEC). The HBM test emulates the types of ESD events seen during manufacturing and handling, while the IEC ESD test is an end equipment test intended to harden equipment to ESD events seen in the field.

The special ESD structures utilized in Intersil’s full featured families allow these transceivers to meet the highest level for each of the standards.

View all high IEC61000 ESD products »

View all high HBM ESD products »

Ruggedized Fault Protected: Over-Voltage Protected (OVP)

Over-voltage protected, or fault protected, transceivers are designed so that the RS-485 bus pins can handle voltages much higher than those required by the RS-485 standard. This protects the device when power is routed in the same conduit as the data cable.

Intersil devices also feature a wide common mode voltage range (CMR) to compensate for the common mode voltage pick-up that occurs in long networks and noisy environments.

The ±16.5kV HBM ESD, the OVP and wide CMR features combined make the Intersil devices some of the most robust RS-485 transceivers available.

View all fault protected products »

High Speed Transceivers

Applications like robotics, motor control and data acquisition require high data rates for minimal latency and increased throughput. Intersil’s full featured, high speed family specifies the maximum Rx and Tx skews at 1.5ns, and the maximum part-to-part skew at 4ns.

  • ISL3179E (3V) and ISL3159E (5V) are specified at 40Mbps
  • ISL3259E (5V) operates at data rates up to 100Mbps
  • ISL3159E and ISL3259E have a Tx VOD > 2.1V (for high speed Profibus DP networks)
  • 125°C option to compensate for high temperatures in motor control applications
  • MSOP and DFN packages available

View all high speed transceivers »

Low Voltage and Low Power

Most current generation RS-485 families have a “hot plug” function that disables the device when Vcc drops considerably below its nominal voltage (e.g., at 2.5V for Vcc=3.3V), so 2.5V or 1.8V applications require ICs specifically designed for those operating voltages.

Single Tx (ISL32614E), Single Rx (ISL32610E), and Transceivers (ISL32602/603E) designed for low operating voltages:

  • Operate from voltages as low as 1.8V
  • Feature quiescent supply currents (Icc) as low as 80µA
  • Operate at data rates as high as 256kbps (Applications requiring higher data rates can use the ISL32603E or ISL32614E at 460kbps by powering them from a 3.3V supply)

Power critical applications such as remote sensor links and battery operated security systems benefit from this level of performance.

View all low power products »

Low Cost RS-485 Transceivers

Short, simple, low-node-count networks can often use low-cost RS-485 transceivers.

  • Short networks don't pick up much common mode voltage (CMV) and don't need more than the RS-485 standard CMR or over voltage protection (OVP).
  • Simple networks with ≤ 32 nodes don’t require fractional unit load devices, and electrostatic discharge (ESD) protection may not be required. (Although some basic devices do include ±8kV to ±15kV human body model ESD protection).
  • RS-422 networks with single, always enabled drivers, do not require bus biasing because the bus is constantly driven
  • An electrically short bus doesn’t need to be treated as a transmission line and doesn't require bus termination. (This may not apply in multi-driver RS-485 systems).

View all low cost transceivers »


Many applications need both a RS-232 and RS-485 serial port. The dual protocol devices integrate both the RS-232 and RS-485 into a single package. The single channel device can be programmed to be either a RS-232 or a RS-485 interface. The two channel configuration is very flexible as each channel can be either a RS-232 or a RS-485 port.

Both 3.3V and 5V supply options are available. In-line package and a more compact QFN package are available. The QFN package has additional features including a logic supply pin (VL) and selectable RS-485 data rates. The RS-232 data rate can operate up to 400kbps.

View all multi-protocol products »

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