AM79R70SC datasheet(2/20 Pages) AMD

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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.

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