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AM79R79 Datasheet(PDF) 2 Page - Advanced Micro Devices |
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AM79R79 Datasheet(HTML) 2 Page - Advanced Micro Devices |
2 / 20 page 2 Am79R79 Data Sheet GENERAL DESCRIPTION The AMD family of subscriber line interface circuit (SLIC) products provide the telephone interface func- tions required throughout the worldwide market. AMD SLIC devices address all major telephony markets in- cluding central office (CO), private branch exchange (PBX), digital loop carrier (DLC), fiber-in-the-loop (FITL), radio-in-the-loop (RITL), hybrid fiber coax (HFC), and video telephony applications. The AMD SLIC devices offer support of BORSHT (bat- tery feed, overvoltage protection, ringing, supervision, hybrid, and test) functions with features including cur- rent limiting, on-hook transmission, polarity reversal, Tip Open, and loop-current detection. These features allow reduction of linecard cost by minimizing component count, conserving board space, and supporting auto- mated manufacturing. The AMD SLIC devices provide the two- to four-wire hy- brid function, DC-loop feed, and two-wire supervision. Two-wire termination is programmed by a scaled imped- ance network. Transhybrid balance can be achieved with an external balance circuit or simply programmed using a companion AMD codec device, the Am79C02/03/031 DSLAC™ device, the Am79Q02/021/03 Programmable Quad SLAC (QSLAC™) device, or the Am79Q5457/4457 Nonprogrammable QSLAC device. The Am79R79 Ringing SLIC device is a bipolar mono- lithic SLIC that offers on-chip ringing. Now designers can achieve significant cost reductions at the system level for short-loop applications by integrating the ring- ing function on chip. Examples of such applications would be ISDN terminal adaptors, fiber-in-the-loop, ra- dio-in-the-loop, hybrid fiber/coax and video telephony (home-side) boxes. The Am79R79 Ringing SLIC can provide sufficient voltage to meet the stringent LSSGR five-ringer equivalent specification. Using a CMOS- compatible input waveform and wave shaping R-C net- work, the Am79R79 Ringing SLIC can provide trapezoi- dal wave ringing to meet various design requirements. In order to further enhance the suitability of this device in short-loop, distributed switching applications, AMD has maximized power savings by incorporating battery switching on chip. The Am79R79 Ringing SLIC device switches between two battery supplies such that in the off-hook (active) state, a low battery is used to save power. In order to meet the Open Circuit voltage require- ments of fax machines and maintenance termination units (MTU), the SLIC automatically switches to a higher voltage in the on-hook (standby) state. Like all of the AMD SLIC devices, the Am79R79 Ringing SLIC device supports on-hook transmission, ring-trip detection, programmable loop-detect threshold, and is available with on-chip polarity reversal. The Am79R79 Ringing SLIC device is a programmable constant-cur- rent feed device with two on-chip relay drivers to operate external relays. Several performance grades are avail- able to meet both CCITT and LSSGR requirements, including various longitudinal balance options. This unique device is available in the proven AMD 75 V bi- polar process in the 32-pin PLCC package. |
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