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Agere Communications Inc.

Data Sheet

September 2001

L7585F Full-Feature, Low-Power SLIC and Switch

Table of Contents

Contents

Page

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

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

Architectural Diagram ..................................................3

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

Operating States..........................................................7

Forward Battery Active State ....................................7

Ground Start/Tip Open State ....................................7

Ground Start/Tip Ground State .................................8

Forward Battery Ring Open State .............................8

Ringing States (2) .....................................................8

Disconnect State .......................................................8

Forward Battery Low-Current Active State ...............8

High-Impedance States (2) .......................................8

Reverse Battery Active State ....................................8

Reverse Battery Tip Open State ...............................8

Ground Start/Tip Amplifier State ...............................9

Reverse Battery Ring Open State.............................9

Reverse Battery Low-Current Active State ...............9

Electrical Characteristics ...........................................10

On-State Switch V-I Characteristics ..........................17

Applications ...............................................................18

Tip/Ring Protection .................................................18

NDET Under Fault Conditions ................................18

Power, Clocking, and Layout ..................................18

Ring Trip .................................................................19

False On-Hook Transients ......................................19

Application Diagram ..................................................20

Outline Diagram.........................................................21

44-Pin PLCC ...........................................................21

Ordering Information .................................................22

Figures

Page

Figure 1. Architectural Diagram ................................. 3

Figure 2. 44-Pin Diagram (PLCC) ............................. 4

Figure 3. On-State Switch V-I Characteristics ......... 17

Figure 4. 16-Channel Line Card Solution ................ 20

Tables

Page

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

Table 2. B0—B3 Input State Coding .......................... 7

Table 3. B4—B5 Input State Coding .......................... 7

Table 4. Operating Conditions and Powering .......... 10

Table 5. Ring Trip Detector ..................................... 10

Table 6. Battery Feed Characteristics ..................... 11

Table 7. Analog Signal Pins .................................... 12

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

Table 9. Data Interface and Logic (Logic Inputs

[CLK, NCS, and B0—B5] and

Outputs [NDET]) ........................................ 14

Table 10. Timing Requirements (CLK, B0—B5,

and NCS) ................................................. 14

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

Table 12. Ringing Return Access Switch (SW1) ..... 15

Table 13. Test-In Access Switches

(SW3 and SW6) ....................................... 15

Table 14. Tip and Ring Break Switches

(SW2 and SW4) ....................................... 16

Table 15. Tip and Ring Feedback Switches

(SW2a and SW4a) ................................... 16

Table 16. Ringing Access Switch (SW5) ................. 17