Product category:
Communications ICs (Wired)
News Release from: National Semiconductor | Subject: DP83849C, DP83849ID, DP83849I and DP83849IF
Edited by the Electronicstalk Editorial
Team on 27 October 2006
Industrial transceivers add diagnostics
Application-specific dual-port industrial physical layer transceivers feature flex-port switching technology and advanced cable diagnostics.
National Semiconductor has introduced four application-specific, dual-port industrial physical layer transceivers with flex-port switching technology and advanced cable diagnostics National's DP83849 Phyter family of commercial and industrial transceivers address the expansive, unique needs of embedded design engineers who are developing products that require high-speed industrial connectivity and dual-port functionality for redundancy and system management
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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"National Semiconductor understands the requirements of embedded networking applications and is overcoming the challenges with products that feature unique industry innovations, such as flex-port switching capability", said Jeff Bock, Global Marketing Manager for Freescale's consumer and industrial microcontrollers.
"National's Phyter dual family has outstanding reliability and interoperability that enable Freescale to provide a robust, high-performance connected solution on our ColdFire 68K microcontrollers and PowerQUICC evaluation boards and reference designs".
National's highly integrated DP83849C, DP83849ID, DP83849I and DP83849IF dual-port transceivers include a powerful cable diagnostic that features time domain reflectometry (TDR) and a dynamic link quality monitor, including signal-to-noise ratio (SNR) estimation.
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TDR detects faults during installation, saving significant man-hours of debug work.
Additional innovative cable diagnostics provide real-time continuous dynamic monitoring of the link quality.
For example, the SNR estimation allows system designers to implement a fault prediction mechanism to detect changing or deteriorating link conditions and proactively take corrective action, saving lengthy system downtime and costly repairs.
In addition, the DP83849I and DP83849IF feature a unique, patent-pending flex-port switching capability.
This feature allows the two ports to be internally connected to provide fully integrated distance extension, fibre-to-copper media conversion and hardware-based failover.
Other port mapping options easily can be configured to enable unique port monitoring and network connection topologies.
National guarantees IEEE 802.3u specification compliance by test for all of National's dual transceiver units shipped.
The DP83849 Phyter family boasts error-free operation over 137m of cable, reliably exceeding the Ethernet IEEE802.3u specification of 100 meters.
They interface to twisted pair media or fibre via an external transceiver.
In addition, the family fully supports the joint test action group (JTAG) IEEE1149.1 test standard for ease-of-manufacturing.
They interface directly to media access control (MAC) devices through the IEEE802.3u-compliant MII or RMII interfaces.
By supporting both MII and RMII interfaces, the family has flexibility to interface to a wide range of microcontrollers.
The family also features Auto-MDIX, transparently allowing the end user to use straight or cross-over cables.
The DP83849C transceiver addresses the quality, reliability and cost requirements of embedded developers networking their devices in commercial temperature applications.
In addition to key features such as enhanced cable diagnostics and IEEE 802.3u specification compliance, National's DP83849C incorporates a 25MHz clock-out that eliminates the need, and hence space and cost, of an additional MAC clock source component.
System designers can realise an additional 75-cent cost saving per port by implementing this feature.
The DP83849ID transceiver is well-suited for harsh factory environments that require fibre media support.
National characterised it to operate over the industrial temperature range of -40 to +85C and supports dual enhanced cable diagnostics.
The DP83849I transceiver features flex-port technology that enables configuring of the two ports to provide fully integrated range extension or repeater mode, media conversion from fibre to copper and hardware-based failover to guarantee uninterrupted network operation and port monitoring.
The enhanced cable diagnostics, industrial temperature range and the industry's highest electrostatic discharge (ESD) protection of 4000V make this device well-suited for factory floor and building automation applications.
The DP83849IF transceiver includes support for fibre, flex-port switching and enhanced cable diagnostics.
It also includes energy-detection circuitry for intelligent power management to increase system reliability.
Available now, all four transceivers are packaged in lead-free 80-pin TQFPs.
In 1000-unit quantities, the DP83849C is priced at US $4.50, the DP83849ID is $4.89, the DP83849I is $5.25 and the DP83849IF is $5.82.
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