Dallas - Texas Instruments Inc.'s TLK2208 eight-port Gigabit Ethernet transceiver is claimed to lower power consumption to a maximum of 162 milliwatts per channel at 1.25 Gbits/second. By comparison, single-channel devices operating at that speed typically consume 200 mW and require more than three times the space for the same number of channels, TI said.
The octal device not only saves power in operation but also creates less heat than competing solutions, according to TI. That is said to permit a greater concentration of channels in the same board space. The device is produced in the company's 0.18-micron CMOS process.
The transceiver, which complies with the IEEE 802.3z Gigabit Ethernet specification, has eight full-duplex channels that can be synchronized at speeds from 1 to 1.3 Gbits/s. The channels can be used with independent timing in either of two selectable parallel interface modes.
Based on reduced-pin double-data-rate timing, the dual-mode feature is said to offer greater flexibility and ease of use for system designers, such as the ability to interface to existing ASICs and FPGAs. Also, the TLK2208's timing mechanism provides compatibility with both source-synchronous and source-centered ASICs.
On the serial output, the TLK2208 features programmable pre-emphasis to support transmissions over long distances without data loss. Voltage-mode logic drivers on the serial side require no external capacitors or pull-down resistors. Selectable clock tolerance allows easier synchronization of clock and data, simplifying design, according to the company. An integrated 8/10-bit encoder/decoder with bypass is also on board.
The TLK2208 is a drop-in replacement for comparable octal devices, simplifying layouts and letting manufacturers progress to a more efficient transceiver solution without significant hardware redesign. The device is packaged in a 289-pin ball grid array with a 19 x 19-mm footprint and a 1-mm ball pitch. The chip and evaluation modules are available now. Planned pricing is $30 per unit in quantities of 1,000 units.
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