Serial transceivers stand up to ESD

New single- and dual-port dual-protocol transceivers feature the industry's highest ESD withstand rating and are ideal for space-constrained high reliability applications.

Intersil has introduced a family of single- and dual-port dual-protocol transceivers.

Featuring the industry's highest ESD withstand rating and best price/performance ratio in a tiny, space saving QFN package, the products are ideal solutions for space-constrained high reliability applications.

The devices offer a full complement of features, configurations and capabilities for applications that require flexible serial interface configuration combined with high levels of ESD protection.

The family includes two dual port ICs, the ISL81334 and ISL41334 and the ISL81387 and ISL41387 single port devices.

Each transceiver features 15kV (HBM) ESD protection in compact packages that provide designers with high flexibility for connecting either RS232 or RS485/RS422 devices.

All four versions operate on 5V supplies, provide datarates of 20Mbit/s, feature flow-through pinouts to simplify board layouts, and include 2.7V differential output voltage to provide optimal noise immunity in RS485/422 networks.

Applications include single board computers, factory automation systems, security networks, industrial and process control networks, point-of-sale equipment, gaming such as slot machines and level translators.

The ISL41334 and ISL41387 provide additional functionality, including lower speed and edge rate options for EMI-sensitive designs, or to allow longer bus lengths.

These devices also features a logic supply voltage pin (VL) that sets the VOH level of logic outputs and the switching points of logic inputs, to be compatible with another supply voltage in mixed voltage systems.

When any port on each of the devices is in RS232 mode, an onboard charge pump generates compliant +/-5V output levels.

Each transceiver is RS232 compliant with the Rx outputs handling up to +/-25V and the Tx output handling +/-8V.

In RS485 mode, each transceiver supports both the RS485 and RS422 differential communication standards.

The RS485 receiver features full failsafe operation so output remains high even if inputs are open or shorted.

The RS485 transmitter supports as many as three datarates; two are slew-rate limited.

The charge pumps are disabled when both ports on the dual port ICs are in RS485 mode, to save power, minimise noise and eliminate pump capacitors.

The ISL41334 and ISL41387 are available in 40-pin QFN packages, an innovative Intersil option that offers significant board area savings for space-constrained applications such as point-of-sale terminals.

The ISL81334 and ISL81387 are available in 20-lead SSOP or SOIC packages.

Other key features for the devices are a 20Mbit/s datarate in RS485 mode, fast RS232 datarate up to 650Kbit/s, loopback mode to facilitate board self-test, low current shutdown mode, and flow-through pinouts to simplify layouts.

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