T7256 Agere Systems, T7256 Datasheet - Page 6

• Manufacturer Part Number: T7256
• Description: (T7234 - T7256) Compliance
• Manufacturer: Agere Systems

T7234 Single-Chip NT1 (SCNT1) Euro-LITE Transceiver
Contents
Features ....................................................................................................................................................................1
Description ................................................................................................................................................................1
Pin Information ..........................................................................................................................................................4
Functional Overview ..................................................................................................................................................8
U-Interface Frame Structure ......................................................................................................................................8
S/T-Interface Frame Structure..................................................................................................................................10
U-Interface Description............................................................................................................................................12
S/T-Interface Description .........................................................................................................................................13
Loopbacks ...............................................................................................................................................................14
STLED Description ..................................................................................................................................................15
eoc State Machine Description................................................................................................................................17
Application Briefs.....................................................................................................................................................18
Absolute Maximum Ratings.....................................................................................................................................24
Handling Precautions ..............................................................................................................................................24
Recommended Operating Conditions .....................................................................................................................24
Electrical Characteristics .........................................................................................................................................25
Timing Characteristics .............................................................................................................................................27
Outline Diagram.......................................................................................................................................................28
Ordering Information................................................................................................................................................28
Questions and Answers...........................................................................................................................................29
Glossary ..................................................................................................................................................................51
Standards Documentation .......................................................................................................................................55
2
Bit Assignments .................................................................................................................................................9
ANSI Maintenance Control Description ...........................................................................................................17
Board-Level Testing .........................................................................................................................................17
T7234 Reference Circuit ..................................................................................................................................18
Power Consumption.........................................................................................................................................25
Pin Electrical Characteristics ...........................................................................................................................25
S/T-Interface Receiver Common-Mode Rejection............................................................................................26
Crystal Characteristics.....................................................................................................................................26
Switching Test Input/Output Waveform ............................................................................................................27
Propagation Delay ...........................................................................................................................................27
44-Pin PLCC....................................................................................................................................................28
Introduction ......................................................................................................................................................29
U-Interface .......................................................................................................................................................29
S/T-Interface.....................................................................................................................................................36
Miscellaneous ..................................................................................................................................................47
Table of Contents
Lucent Technologies Inc.
February 1998
Data Sheet
Page