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Intersil transceivers boost performance

Posted: 22 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? electronica forum? linearlink? bicmos transceiver? transceiver?

Intersil Corp. also used the electronica forum in Munich to introduce more of its "LinearLink" family of BiCMOS transceivers.

These are 5V devices that meet both the RS-485 and RS-422 standards for balanced (differential) communication that are typically deployed for long distance transmission and/or in noisy environments.

The ISL83080E thru ISL83088E family of transceivers boast several feature enhancements over the current portfolio including a full fail-safe design, hot swap capability, a fractional unit load to the RS-485 bus, three data rate options and >15kV ESD protection. The transceivers' receiver (Rx) inputs cite a true fail-safe design, which ensures a logic high Rx output if Rx inputs are floating, shorted or terminated but un-driven. This prevents Rx chattering for predictable performance during bus faults.

Hot Plug circuitry is included on the slew rate limited devices to ensure that the transmitter (Tx) and Rx outputs remain in a high-impedance tri-state during power up/power down. This ensures data is not disrupted when a node is plugged onto an active bus.

Two data rate options offer slew rate-limiting (115kbps and 500kbps) while a third high-speed option provides data rates up to 10Mbps.

These devices are also one-eighth fractional-unit load transceivers that enable up to 256 nodes on the RS-485 bus (as compared to only 32 nodes for single-unit load devices). The large number of nodes on a single bus saves cost and complexity, by eliminating the need for repeaters in large networks. Applications using this feature include e-power meters, factory automation communications, process control, environmental control systems and security systems.

Power up

The power-up circuitry ensures that the Tx and Rx outputs remain in a high impedance state until the power supply has stabilized. 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, and the Tx outputs automatically re-enable once the IC cools down.

These ICs are ESD protected to 15kV on all Tx and Rx bus pins and up to 7kV on all logic pins, which improves survivability from random static charges during manufacturing and use. Unlike some competitive devices, these new RS-485 and RS-422 transceivers are specified for 10 percent tolerance supplies (4.5V to 5.5V).

Specified for single 5V, 10 percent tolerance, supplies, the ISL8308x features a 1/8 unit load that allows up to 256 devices on the bus, data rates of up to 10Mbps, quiescent supply current of 560?A, shutdown supply current of 70?A, common mode input voltage range of -7V to 12V, half and full duplex pinouts, tri-state receiver and transmitter outputs, and current limiting and thermal shutdown for driver overload protection.

- eeProductCenter

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