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Intersil's seven new data transceivers comply to RS-485, RS-422

Posted: 23 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? bicmos? data transceiver? transceiver? isl8307xe?

Intersil Corp.'s seven new devices are BiCMOS 3.3V powered, single data transceivers that meet both the RS-485 and RS-422 standards for differential data communications.

The ISL8307xE family features enhancements over the company's current portfolio of transceivers, covering the range of features associated with the RS-485 protocol. In addition to full fail-safe receivers and hot swap circuitry, these new products provide fractional unit loads that allow up to 256 nodes on the bus along with full or half duplex operation and three data rate options. The transceivers also provide ESD protection of greater than 15kV human body model (HBM) on the bus input/output (I/O) pins and 7kV HBM ESD on all other pins.

"Our new 3.3V family complements the 5V family (ISL8308xE) of transceivers we introduced last fall and brings our total transceiver portfolio to well over 100 devices," said Randy Pitts, product marketing manager for Interface products in Intersil's Analog Signal Processing Products Group. "These industry-leading full feature 3.3V parts join our expanding family of 5V, full duplex, half duplex, slew-rate limited, high speed and fractional load interface products to serve just about any data transmission application."

The ISL8307xE 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 un-driven. This prevents Rx output chattering for predictable performance during bus faults, Intersil explained. Hot swap circuitry is included on all the devices to ensure that the transmitter (Tx) and Rx outputs remain tri-stated during power up, ensuring that data is not disrupted when a node is plugged into an active bus. Additionally, three data rate options provide two slew rate-limited options for low data rates (250kbps and 500kbps) and a high-speed option for up to 20Mbps data rates.

The ISL83070E, ISL83071E, ISL83072E, ISL83073E, ISL83075E, ISL83076E and ISL83078E devices also feature a quiescent supply current of 800?A (max), shutdown supply current of 10nA, Common mode input/output voltage range between -7V and 12V, and current limiting and thermal shutdown for driver overload protection.

The entire family of transceivers is available in 8- and 14-lead SOIC packages, while the ISL83072E/75E/78E half duplex devices are housed in the tiny 8-lead MSOP package. Suggested resale price is $1.26 each in 1,000-piece quantities. These products are also available on tape and reel.

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