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ATTL7554AP

L7554 Low-Power SLIC

Agere -> LSI Corporation 

L7554 Low-Power SLIC

Data Sheet

March 1997

Table of Contents

Content

Page

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

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

Pin Information ......................................................................................................................................................... 4

Functional Description .............................................................................................................................................. 6

Absolute Maximum Ratings ..................................................................................................................................... 6

Recommended Operating Conditions ..................................................................................................................... 7

Electrical Characteristics ......................................................................................................................................... 7

Ring Trip Requirements ..................................................................................................................................... 11

Test Configurations ............................................................................................................................................... 12

Applications ........................................................................................................................................................... 14

Design Considerations ....................................................................................................................................... 16

Characteristic Curves......................................................................................................................................... 17

dc Applications ................................................................................................................................................... 20

Battery Feed.................................................................................................................................................... 20

Overhead Voltage .......................................................................................................................................... 20

Adjusting Overhead Voltage ........................................................................................................................... 21

Adjusting dc Feed Resistance......................................................................................................................... 22

Adjusting Overhead Voltage and dc Feed Resistance Simultaneously .......................................................... 22

Loop Range..................................................................................................................................................... 22

Off-Hook Detection ......................................................................................................................................... 22

Ring Trip Detection......................................................................................................................................... 23

Ring Ground Detection................................................................................................................................... 23

ac Design ........................................................................................................................................................... 24

First-Generation Codecs.................................................................................................................................. 24

Second-Generation Codecs ............................................................................................................................ 24

Third-Generation Codecs ................................................................................................................................ 24

Selection Criteria ............................................................................................................................................. 24

PCB Layout Information ......................................................................................................................................... 26

Outline Diagram...................................................................................................................................................... 27

44-Pin PLCC ....................................................................................................................................................... 27

Ordering Information ........................................................................................................................................... 28

2

Lucent Technologies Inc.

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