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Transceivers save 70% board space

Posted: 01 Sep 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Intersil? transceiver? ISL317XE?

Intersil's new family of RS-485/RS-422 transceivers

Intersil Corp. announced that members of its new family of 3.3V RS-485/RS-422 transceivers save 50 to 70 percent of valuable board space and deliver the industry's only full-featured IEC61000 ESD-protected transceivers with 20Mbps data transmission rate.

The nine-member ISL317XE family promises maximum reliability of exposed transmitter and receiver pins with IEC61000 electrostatic discharge (ESD) protection that allows customers to develop the most rugged systems possible.

"IEC61000 ESD protection on the I/O pins and 7kV HBM on all other pins in Intersil's ISL317XE family provides a high degree of reliability in both manufacturing and end consumer applications and eliminates the need for external protection circuitry," said Randy Pitts, marketing manager of Intersil's interface products group.

The line's enhanced features include full fail-safe design and hot plug capability, full/half duplex and three data rate options. The family's full fail-safe feature eliminates external components and ensures consistent performance when bus faults occur.

The new RS-485/RS-422 transceivers come in MSOP sizes that allow designs to drop old 8- and 14-lead SOIC transceivers. The 8-lead MSOP package provides a 50 percent board space savings over 8-lead SOIC packages, while Intersil's 10-lead MSOP package helps save 70 percent over old 14-lead SOIC package options.

"We believe the ongoing change from 5V to 3.3V supply voltages is permanent," Pitts said. "Our board space advantage over our competitors will become more important as those changes continue throughout the industry."

Applications include factory automation, security networks, building environmental control systems, industrial/process control systems and automated utility meter reading systems.

The ISL317XE family covers all features and configurations associated with the RS-485 protocol.

Data rate options are offered to match the application speed. For low-speed applications, the family offers slew-rate-limited versions at 250Kbps: ISL3170E/71E/72E, and 500Kbps: ISL3173E/74E/75E. The ISL3176E/77E/78E devices operate up to 20Mbps for high-speed applications.

Hot plug circuitry
The ISL317XE family's hot plug circuitry ensures active data on the bus won't be corrupted when the new device is connected to it. Slew-rate limited drivers reduce electromagnetic interference and minimize reflections from improperly terminated transmission lines or unterminated stubs in multidrop and multipoint applications. Slew-rate limited versions also have receiver input filtering to reduce the impact of noise on slow input signals.

All devices present a light "one-eighth unit load" to the RS-485 bus, allowing up to 256 transceivers on the network. Tx outputs and Rx inputs maintain this load even when the voltages exceed the supply voltages by as much as -7V and 9V.

Rx inputs feature a full fail-safe design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or terminated but undriven. The hot plug circuitry ensures that the Tx and Rx outputs remain tri-state during power up/power down. Driver outputs are short-circuit protected, even for voltages exceeding the power supply voltage. Also, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive.

Pricing for the ISL317XE transceivers starts at $1.68 in 1,000-unit quantities.

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