Technology Industry
Industry: Email Alert RSS FeedDSL and POTS interfaces add features, simplify designs.(Le79555 and Le87S11 from Legerity)(Product Announcement)
EDN, June, 2001 by Israelsohn, Joshua
TWO NEW CHIPS FROM AMD spin-off Legerity reduce-power supply requirements and simplify pc-board layouts. For POTS, the Le79555 low-power SLIC (subscriber-line-interface circuit) operates from a single -16 to -58V rail. A built-in switching regulator eliminates the need for a -5V supply and its associated components, and an on-chip changeover switch selects between primary and backup power sources. High-density line cards also benefit from the 79555's 6V overhead voltage and 45-mW standby power.
The control interface supports active, reverse-polarity, open-tip, ringing, standby, and open-circuit states. The chip also supports on-hook transmission. Both the loop current and the two-wire interface impedance are resistor-programmable. Volume pricing for the...
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