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Agere Systems

L8575 Datasheet Preview

L8575 Datasheet

Low-Cost Subscriber Line Interface Circuit

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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.




Agere Systems

L8575 Datasheet Preview

L8575 Datasheet

Low-Cost Subscriber Line Interface Circuit

No Preview Available !

L8575
Dual-Resistive, Low-Cost SLIC
Advance Data Sheet
March 1997
Table of Contents
Contents
Page
Features .................................................................................................................................................................. 1
Description ...............................................................................................................................................................1
Preliminary Pin Information ..................................................................................................................................... 5
Absolute Maximum Ratings (@ TA = 25 °C) ............................................................................................................ 8
Electrical Characteristics ......................................................................................................................................... 9
Relay Drivers ..................................................................................................................................................... 11
Transmission...................................................................................................................................................... 13
Serial Interface and Logic .................................................................................................................................. 14
Applications ........................................................................................................................................................... 16
General .............................................................................................................................................................. 16
Resistor Module................................................................................................................................................. 16
Protection .......................................................................................................................................................... 18
Tip/Ring Drivers ................................................................................................................................................. 20
Receive Interface............................................................................................................................................... 20
Transmit Interface .............................................................................................................................................. 20
Battery Noise Cancellation ................................................................................................................................ 20
On-Hook Transmission....................................................................................................................................... 21
Self-Test............................................................................................................................................................. 21
Serial Data Interface .......................................................................................................................................... 21
Operating States.................................................................................................................................................... 24
Active State........................................................................................................................................................ 24
Test State........................................................................................................................................................... 24
Powerdown State with Relay Driver RDD Operated .......................................................................................... 24
Powerdown State............................................................................................................................................... 24
Ringing State (D2 = 1) ....................................................................................................................................... 24
Supervision............................................................................................................................................................ 25
Off-Hook Detection ............................................................................................................................................ 25
Ring-Trip Threshold ........................................................................................................................................... 25
Ring-Trip Requirements......................................................................................................................................25
Fault Detection................................................................................................................................................... 26
Zero Voltage Current Cross ............................................................................................................................... 26
Relay Drivers ..................................................................................................................................................... 26
dc Characteristics .................................................................................................................................................. 27
I/V Characteristics ............................................................................................................................................. 27
Loop Length....................................................................................................................................................... 27
ac Design............................................................................................................................................................... 28
Codec Features and Selection Summary.......................................................................................................... 28
Design Equations .............................................................................................................................................. 29
Application Diagram ..............................................................................................................................................33
Outline Diagram..................................................................................................................................................... 35
44-Pin PLCC...................................................................................................................................................... 35
Ordering Information ..............................................................................................................................................36
2 Lucent Technologies Inc.


Part Number L8575
Description Low-Cost Subscriber Line Interface Circuit
Maker Agere Systems
Total Page 30 Pages
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