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Intersil transceivers meet RS-485, RS-422 standards

Posted: 29 Oct 2003 ?? ?Print Version ?Bookmark and Share

Keywords:rs-485? rs-422? intersil? transceiver?

The ISL83483, ISL83485, ISL83488, ISL83490 and ISL83491 devices from Intersil Corp. are BiCMOS 3.3V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, the transceivers are specified for 10 percent tolerance supplies (3V to 3.6V).

The ISL83483 and ISL83488 use slew rate limited drivers which reduce EMI, and minimize reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications.

Data rates up to 10Mbps are achieved by using the ISL83485, ISL83490, or ISL83491, which feature higher slew rates.

The ISL83488, ISL83490, and ISL83491 are configured for full duplex applications. The ISL83488 and ISL83490 are offered in 8-lead packages for applications not requiring receiver (Rx) and driver (Tx) output disable functions. Half duplex configurations (ISL83483, ISL83485) multiplex the Rx inputs and Tx outputs to provide transceivers with Rx and Tx disable functions in 8-lead packages.

The product's Rx inputs feature a "fail-safe if open" design, which ensures a logic high output if Rx inputs are floating. All devices present a "single unit load" to the RS-485 bus, which allows up to 32 transceivers on the network. Meanwhile, Tx outputs are short circuit protected, even for voltages exceeding the power supply voltage. Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive.

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