Product category:
Communications ICs (Wired)
News Release from: Intersil | Subject: ISL8307xE family
Edited by the Electronicstalk Editorial
Team on 11 July 2005
Serial transceivers survive noisy
environments
Intersil has introduced seven data transceivers that are BiCMOS 3.3V powered, single transceivers meeting both RS485 and RS422 standards for differential datacommunications.
Intersil has introduced seven data transceivers that are BiCMOS 3.3V powered, single transceivers meeting both RS485 and RS422 standards for differential datacommunications The industry-leading, full feature parts join Intersil's expanding family of 5V, full duplex, half duplex, slew-rate limited, high speed and fractional load interface products enabling the company to serve just about any data transmission application
This article was originally published on Electronicstalk on 8 Oct 2008 at 8.00am (UK)
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The parts use balanced data-transmission schemes and are robust solutions for transmitting data over long distances and in noisy environments.
The devices are ideal for applications in factory automation, security networks, building environmental control systems, industrial process control systems and automated utility meter-reading systems.
The ISL8307xE family features enhancements over the current portfolio of Intersil transceivers, covering the range of features associated with the RS485 protocol.
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In addition to full fail-safe receivers and hot swap circuitry, the devices 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.
The ESD protection provides a high degree of reliability in both manufacturing and end-customer applications and eliminates the need for external protection circuitry.
The devices are packaged in tiny MSOP packages, which are 50% smaller that standard SOIC packages.
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 undriven.
This prevents Rx output chattering for predictable performance during bus faults.
Hot swap circuitry is included on all the devices to ensure that the transmitter (Tx) and Rx outputs remain tristated during power up.
This ensures data isn't disrupted when a node is plugged into an active bus.
Three data rate options provide two slew rate-limited options for low datarates (250 and 500Kbit/s) and a high-speed option for up to 20Mbit/s datarates.
The devices are one-eighth (fractional) unit load transceivers that enable up to 256 nodes on the RS485 bus as compared with 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 (ie e-power meters, factory automation, process/environmental control or security systems).
Power-up circuitry ensures that the Tx and Rx outputs remain in a high impedance state until the power supply has stabilised.
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.
Unlike some competing devices, the ISL8307xE family of RS485 and RS422 transceivers are specified for 10% tolerance supplies (3.0 to 3.6V).
Intersil's 3.3V family complements its existing 5V family (ISL8308xE) of transceivers and brings the company's total transceiver portfolio to well over 100 devices.
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