AM79R79-3JC AMD (ADVANCED MICRO DEVICES), AM79R79-3JC Datasheet - Page 2

• Manufacturer Part Number: AM79R79-3JC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79R79-3JC

• Lead Free Status / RoHS Status: Supplier Unconfirmed

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
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P R E L I M I N A R Y
Am79R79 Data Sheet
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 both 28-pin plastic DIP and 32-pin
PLCC packages.