DEMO KIT AVAILABLE DS21349 3.3V T1/J1 Line Interface Unit www.maxim-ic.com GENERAL DESCRIPTION FEATURES The DS21349 is a fully integrated LIU for long- Fully Integrated Line Interface Unit (LIU) haul or short-haul T1 applications over twisted- Pin Compatible with LevelOne LXT362 pair installations. It interfaces to two twisted-pair Supports Both Long Haul and Short Haul linesone pair for transmit and one pair for Crystal-Less Jitter Attenuator receive through an appropriate network Jitter Attenuator Programmable for Transmit interface. The device can be configured for or Receive Path control through software or hardware mode. Meets ANSI T1.102, T1.403, T1.408, and Software control is accomplished over a serial AT&T 62411 port in hardware mode individual pin settings Usable Receive Sensitivity of 0dB to -36dB allow stand-alone operation. The device provides That Allows the Device to Operate on a precise, crystal-less jitter attenuator that can be 0.63mm (22AWG) Cables Up to 6k Feet in placed in either the transmit or receive path. Length Five Line Build-Out Settings for Short-Haul Applications APPLICATIONS Four CSU Filters from 0dB to -22.5dB Routers Transmit/Receive Performance Monitors Data Service Units (DSUs) with Driver-Fail, Monitor-Open, and Loss- Channel Service Units (CSUs) of-Signal Outputs Muxes Bipolar or NRZ Interface Switches Programmable B8ZS Encoder/Decoder Channel Banks QRSS Generator/Detector T1/E1 Test Equipment Local, Remote, and Analog Loopbacks Generates and Detects In-Band Loop-Up and PIN CONFIGURATION Loop-Down Codes Serial Interface Provides Access to Control TOP VIEW Registers 4 3 2 1 28 27 26 ORDERING INFORMATION 25 5 6 24 TEMP PIN- 23 7 PART RANGE PACKAGE 8 DS21349 22 21 9 DS21349Q 0C to +70C 28 PLCC 10 20 19 11 12 13 14 15 16 17 18 DS21349Q+ 0C to +70C 28 PLCC DS21349QN -40C to +85C 28 PLCC PLCC DS21349QN+ -40C to +85C 28 PLCC +Denotes lead-free/RoHS-compliant package. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 35 REV: 011206 DS21349 TABLE OF CONTENTS 1. DETAILED DESCRIPTION.................................................................................................4 2. OPERATING MODES.........................................................................................................5 3. INITIALIZATION AND RESET............................................................................................9 4. REGISTER DEFINITIONS ..................................................................................................10 5. TRANSMITTER...................................................................................................................16 5.1 TRANSMIT DIGITAL DATA INTERFACE............................................................................................... 16 5.2 TRANSMIT MONITORING .................................................................................................................. 16 5.3 TRANSMIT IDLE MODE..................................................................................................................... 16 5.4 TRANSMIT PULSE SHAPE ................................................................................................................ 16 6. RECEIVER..........................................................................................................................17 6.1 RECEIVE EQUALIZER....................................................................................................................... 17 6.2 RECEIVE DATA RECOVERY.............................................................................................................. 17 6.3 RECEIVE DIGITAL-DATA INTERFACE................................................................................................. 17 6.4 RECEIVE MONITOR MODE ............................................................................................................... 17 7. JITTER ATTENUATION .....................................................................................................18 8. HARDWARE MODE ...........................................................................................................18 9. SOFTWARE MODE............................................................................................................19 9.1 INTERRUPT HANDLING .................................................................................................................... 19 10. DIAGNOSTIC MODE OPERATION....................................................................................22 10.1 LOOPBACK MODES ......................................................................................................................... 22 10.1.1 Local Loopback (LLB)...................................................................................................................................22 10.1.2 Analog Loopback (ALB)................................................................................................................................22 10.1.3 Remote Loopback (RLB) ..............................................................................................................................22 10.1.4 Network Loopback........................................................................................................................................23 10.1.5 Dual Loopback..............................................................................................................................................23 10.2 INTERNAL PATTERN GENERATION AND DETECTION .......................................................................... 24 10.2.1 Transmit Alarm-Indication Signal (TAIS) ......................................................................................................24 10.2.2 Quasirandom Signal Source (QRSS) ...........................................................................................................24 10.2.3 In-Band Network Loop-Up or Loop-Down Code Generator .........................................................................25 10.3 ERROR INSERTION AND DETECTION................................................................................................. 25 10.3.1 Bipolar Violation Insertion (INSBPV) ............................................................................................................25 10.3.2 Logic Error Insertion (INSLE) .......................................................................................................................25 10.3.3 Logic Error Detection (QPD).........................................................................................................................25 10.3.4 Bipolar Violation Detection (BPV).................................................................................................................25 10.4 ALARM MONITORING....................................................................................................................... 26 10.4.1 Receive-Carrier Loss (RCL) .........................................................................................................................26 10.4.2 Alarm-Indication-Signal Detection (AIS).......................................................................................................26 10.4.3 Driver-Fail Monitor-Open (DFMO) ................................................................................................................26 10.4.4 Jitter Attenuator Limit Trip (JALT).................................................................................................................26 10.5 OTHER DIAGNOSTIC REPORTS ........................................................................................................ 26 10.5.1 Receive Line-Attenuation Indication.............................................................................................................26 11. NETWORK INTERFACE ....................................................................................................27 12. DC CHARACTERISTICS....................................................................................................31 13. PACKAGE INFORMATION ................................................................................................35 13.1 28-PIN PLCC (56-G4001-001) ...................................................................................................... 35 2 of 35