L8575
Dual-Resistive, Low-Cost SLIC
Advance Data Sheet
March 1997
2
Lucent Technologies Inc.
Table of Contents
Contents
Page
Features .................................................................................................................................................................. 1
Description ...............................................................................................................................................................1
Preliminary Pin Information ..................................................................................................................................... 5
Absolute Maximum Ratings (@ T
A
= 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