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AM79R70JC датащи(PDF) 2 Page - Advanced Micro Devices |
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AM79R70JC датащи(HTML) 2 Page - Advanced Micro Devices |
2 / 20 page 2 Am79R70 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 al- low 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 Am79Q02/021/031 Programmable Quad SLAC (QSLAC™) device, or the Am79Q5457/ 4457 Nonprogrammable QSLAC device. The Am79R70 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 and set top boxes. Using a CMOS-compatible input waveform and wave shaping R-C network, the Am79R70 Ringing SLIC can provide trapezoidal wave ringing to meet various de- sign 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 Am79R70 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 Am79R70 Ring- ing SLIC device supports on-hook transmission, ring- trip detection and programmable loop-detect threshold. The Am79R70 Ringing SLIC device is a programmable constant-current feed device with two on-chip relay drivers to operate external relays. This unique device is available in the proven AMD 75 V bipolar process in 32-pin PLCC packages. |
Аналогичный номер детали - AM79R70JC |
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Аналогичное описание - AM79R70JC |
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