L7554 AGERE [Agere Systems], L7554 Datasheet - Page 2

• Manufacturer Part Number: L7554
• Description: L7554 Low-Power SLIC
• Manufacturer: AGERE [Agere Systems]

L7554 Low-Power SLIC
Content
Features .................................................................................................................................................................. 1
Description ............................................................................................................................................................... 1
Pin Information ......................................................................................................................................................... 4
Functional Description .............................................................................................................................................. 6
Absolute Maximum Ratings ..................................................................................................................................... 6
Recommended Operating Conditions ..................................................................................................................... 7
Electrical Characteristics ......................................................................................................................................... 7
Test Configurations ............................................................................................................................................... 12
Applications ........................................................................................................................................................... 14
PCB Layout Information ......................................................................................................................................... 26
Outline Diagram...................................................................................................................................................... 27
2
Ring Trip Requirements ..................................................................................................................................... 11
Design Considerations ....................................................................................................................................... 16
Characteristic Curves......................................................................................................................................... 17
dc Applications ................................................................................................................................................... 20
ac Design ........................................................................................................................................................... 24
44-Pin PLCC ....................................................................................................................................................... 27
Ordering Information ........................................................................................................................................... 28
First-Generation Codecs.................................................................................................................................. 24
Second-Generation Codecs ............................................................................................................................ 24
Third-Generation Codecs ................................................................................................................................ 24
Selection Criteria ............................................................................................................................................. 24
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
Table of Contents
Lucent Technologies Inc.
March 1997
Data Sheet
Page