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L8574D

Resistive Subscriber Line Interface Circuit (SLIC), Ring Relay, and Protector (SRP) for Long Loop and TR-57 Applications

Agere -> LSI Corporation 

Data Sheet

October 1998

L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring

Relay, and Protector (SRP) for Long Loop and TR-57 Applications

Table of Contents (continued)

Tables

Page

Table 1. Pin Descriptions ........................................................................................................................................... 5

Table 2. Operating Conditions and Powering ............................................................................................................ 7

Table 3. Ring Trip Detector ........................................................................................................................................ 8

Table 4. Battery Feed ................................................................................................................................................ 8

Table 5. Electrical Characteristics of Pins PT, PR, and VBF ....................................................................................... 9

Table 6. Loss of Power Supplies.............................................................................................................................. 10

Table 7. Analog Signal Pins..................................................................................................................................... 11

Table 8. ac Transmission Characteristics................................................................................................................. 13

Table 9. Logic Inputs (CE, CS, and B0—B3) and Output NSTAT ............................................................................ 14

Table 10. Timing Requirements (B0—B3 and CS) .................................................................................................. 14

Table 11. Relay Driver (RDO) .................................................................................................................................. 14

Table 12. Battery Switch (SW1) and Ring Break Switch (SW2) .............................................................................. 15

Table 13. Ringing Access Switch (SW3) ................................................................................................................. 15

Table 14. Input State Coding ................................................................................................................................... 16

Table 15. External Components Required............................................................................................................... 20

Table 16. MMC A31A8574AA and MMC A11A8574AA Module.............................................................................. 23

Figures

Page

Figure 1. Architectural Diagram................................................................................................................................. 4

Figure 2. Pin Layout .................................................................................................................................................. 4

Figure 3. Switch On-State V-I Characteristics SW1 and SW2................................................................................. 16

Figure 4. Switch On-State V-I Characteristics SW3................................................................................................. 16

Figure 5. External Components Required ............................................................................................................... 19

Figure 6. Resistor Network...................................................................................................................................... 23

Figure 7. L8574 SLIC Matching Requirements ....................................................................................................... 24

Figure 8. Implementing the Noise Cancellation Function........................................................................................ 25

Figure 9. Ring Trip Threshold .................................................................................................................................. 26

Figure 10. Loop Current vs. Loop Voltage ............................................................................................................... 28

Figure 11. Equivalent Complex Terminations .......................................................................................................... 29

Figure 12. Initial ac Interface for Complex Termination Between L8574 SLIC and T7504 Codec .......................... 30

Figure 13. Revised ac Interface CT and CR Combined into a Single Capacitor CS ................................................. 31

Figure 14. Addition of Resistor RSC from XMT to IRP ............................................................................................. 31

Figure 15. TR-57 Application Diagram .................................................................................................................... 33

Lucent Technologies Inc.

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