L8575

Advance Data Sheet

Dual-Resistive, Low-Cost SLIC

March 1997

2

Lucent Technologies Inc.

Table of Contents

Contents

Page

Features .................................................................................................................................................................. 1

Description ...............................................................................................................................................................1

Preliminary Pin Information ..................................................................................................................................... 5

°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