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PDF ( 数据手册 , 数据表 ) LUCL8575BP

零件编号 LUCL8575BP
描述 Dual-Resistive/Low-Cost Subscriber Line Interface Circuit(SLIC)
制造商 Agere Systems
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LUCL8575BP 数据手册, 描述, 功能
Advance Data Sheet
March 1997
L8575 Dual-Resistive, Low-Cost
Subscriber Line Interface Circuit (SLIC)
Features
s Two channels in a single package
s Serial data interface
s Per-channel powerdown
s Low standby power (65 mW per channel)
s Integrated protection
s No external protection device required
s Battery noise cancellation
s Switchhook detector
s Ring-trip detector
s Switchhook and ring-trip detector self-test
s Fault detector
s Zero ring voltage cross detection
s Three relay drivers per channel
s 44-pin, surface-mount, plastic package (PLCC)
Description
The L8575 is a dual-resistive, low-cost subscriber
line interface circuit (SLIC) that is optimized to meet
both ITU-T recommendations and LSSGR require-
ments for 600 /900 resistive and complex imped-
ance termination applications. It interfaces the low-
voltage circuits on an analog line card to the Tip and
Ring of two subscriber loops. The L8575 does not
supply dc current to the subscriber loops—external
resistors are used for this purpose. The device is built
using a 90 V complementary bipolar (CBIC) process
and is available in a 44-pin PLCC package.







LUCL8575BP pdf, 数据表
L8575
Dual-Resistive, Low-Cost SLIC
Advance Data Sheet
March 1997
Absolute Maximum Ratings (@ TA = 25 °C)
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of this data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
5 V Analog dc Supply
5 V Digital dc Supply
Office Battery Supply
Logic Input Voltage
Logic Input Clamp Diode Current, per Pin
Logic Output Voltage
Logic Output Current, per Pin (excluding relay drivers)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Relative Humidity Range
Ground Potential Difference (DGND to AGND)
Symbol
VDDA
VDDD
VBAT
Tstg
Min
–0.5
–0.5
–65
–0.5
–0.5
–40
–40
5
+0.5
Value
±20
±35
150
Max
+7.0
+7.0
+0.5
VDDD + 0.5
VDDD + 0.5
+125
+125
95
–0.5
Unit
V
V
V
V
mA
V
mA
°C
°C
°C
%
V
Notes:
Analog and battery voltages are referenced to AGND; digital (logic) voltages are referenced to DGND.
The IC can be damaged unless all ground connections are applied before, and removed after, all other connections. Furthermore, when power-
ing the device, the user must guarantee that no external potential creates a voltage on any pin of the device that exceeds the device ratings.
Some of the known examples of conditions that cause such potentials during powering are (1) an inductor connected to Tip and Ring that can
force an overvoltage on VBAT through external components if the VBAT connection chatters, and (2) inductance in the VBAT lead that could reso-
nate with the VBAT filter capacitor to cause a destructive overvoltage.
8 Lucent Technologies Inc.







LUCL8575BP equivalent, schematic
L8575
Dual-Resistive, Low-Cost SLIC
Advance Data Sheet
March 1997
Applications
General
The L8575 is a dual (channels A and B) subscriber line
interface circuit (SLIC). Each channel operates inde-
pendently such that no interaction occurs between the
channels. The following description applies to both
channels though the description may refer to only a sin-
gle channel. Some circuits, such as reference circuits
which do not impact interchannel crosstalk, are com-
mon to both channels.
The L8575 device supplies a precise differential current
to the Tip/Ring pair (via PT and PR) as a function of
analog signal voltages on IRP and VRN. However, the
current drivers connected to PT and PR are not
designed to supply dc feed current to the loop. Two
external resistors (typically 300 ), connected to office
battery and ground, must be used in conjunction with
the L8575 SLIC to provide dc loop current. These resis-
tors will primarily determine the longitudinal balance of
the line feed; thus, they must be matched appropriately
to meet the longitudinal balance requirements (0.4%
for 50 dB balance).
These resistors also have a significant impact on the
termination impedance of the SLIC. Feedback, using
external components, allows the user to adjust the ter-
mination impedance from the intrinsic 600 of the feed
resistors to most ITU-T recommended complex termi-
nation impedances. Since the L8575 does not supply
dc to the loop, outputs PT and PR can be coupled to
the Tip and Ring through a resistance high enough to
allow for simple lightning protection of the drivers. How-
ever, the resistance must be low enough to achieve the
coupling of sufficient ac signals to the Tip and Ring
from the available power supply. Since the Tip and Ring
drivers are current sources, the value of the resistance
is arbitrary and does not affect the performance of the
SLIC. A minimum value of 1400 (1.4 k) is required
for protection purposes.
The L8575 also senses the Tip voltage, Ring voltage,
and differential Tip/Ring voltage via the TS and RS
sense inputs. The differential dc voltage is used inter-
nally for switchhook detection. The Tip and Ring volt-
ages are also used internally to detect faults on Tip and
Ring. Both detector thresholds are preset internally.
The status of each detector is monitored at pin DO by
reading the 8-bit serial shift register. The differential
Tip/Ring ac signal appears on analog output XMT.
The L8575 also includes:
s Per-channel ring-trip detectors, loop closure detec-
tors.
s Six relay drivers (three per channel).
s 8-bit serial-to-parallel and parallel-to-serial logic
interface.
s Per-channel circuits which eliminate the battery
noise that is coupled to the Tip and Ring through the
dc feed resistors.
s Fault detection.
s Zero ring voltage detection.
Resistor Module
The L8575 requires certain external resistors at the Tip
and Ring interface. Because of matching and protec-
tion requirements, one of the most economical options
recommended to implement these registers is in a thick
film resistor module. A schematic and a brief descrip-
tion of the function of each of these resistors is given in
Figure 4. Note that Microelectronic Modules Corpora-
tion* MMC A31A8575AA Thick Film resistor module is
an application-specific resistor module designed for
use with the L8575 SLIC. The values, tolerance, match-
ing, and power rating of the MMC A31A8575AA mod-
ule are given in Table 10.
Resistors R1 and R2 are the dc feed resistors. R1 is
connected from battery to Ring, and R2 is connected
from Tip to ground. The dc loop current is fed to the
subscriber loop via these resistors. These resistors will
set the dc I/V template of the line circuit with the I/V
template being linear with a –1/600 slope. No con-
stant current region at short dc loops is provided by
resistors R1 and R2, or the L8575 SLIC.
* For additional information, contact Microelectronic Modules
Corporation (MMC), 2601 S. Moorland Rd., New Berlin, WI 53151:
U.S.A: (414) 785-6506
FAX Number: (414) 785-6516
16 Lucent Technologies Inc.










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