LXT331 —
Dual T1/E1 Line Interface Unit
4
Datasheet
Figures
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LXT331 Block Diagram .........................................................................................5
LXT331 44 Pin Assignments and Markings..........................................................6
50% AMI Coding .................................................................................................11
LXT331 Driver Performance Monitor ..................................................................13
LXT331 SIO Write Operations ............................................................................15
LXT331 SIO Read Operation..............................................................................16
LXT331 Interrupt Handling..................................................................................17
Transmit All Ones Data Path...............................................................................18
TAOS with Analog Loopback..............................................................................19
Analog Loopback ................................................................................................19
Line Interface for E1 Coax .................................................................................22
Typical LXT331 T1 Application (Host Control Mode, Bipolar I/O).......................23
Typical LXT331 E1 120 W Twisted Pair Application (Hardware Control Mode) .24
LXT331 Transmit Clock Timing...........................................................................27
LXT331 Receive Timing......................................................................................28
LXT331 Serial Input Timing Diagram..................................................................29
LXT331 Serial Output Timing Diagram ...............................................................29
LXT331 PLCC Package Specification.................................................................30
LXT331 QFP Package Specification...................................................................31
Tables
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14
Pin Descriptions....................................................................................................7
Equalizer Control Inputs - Hardware Mode1.......................................................12
SIO Input Bit Settings (See
Figure 5
)..................................................................14
LXT331 Serial Data Output Bit Coding ...............................................................15
Hardware Mode Diagnostic Selection.................................................................18
Recommended Transmit Transformer Values ....................................................20
Transmit Transformer Combinations...................................................................20
Absolute Maximum Ratings ................................................................................25
Recommended Operating Conditions.................................................................25
Electrical Characteristics (Over Recommended Operating Range)....................25
Analog Specifications (Over Recommended Operating Range).........................26
LXT331 Master Clock and Transmit Timing Characteristics (See
Figure 14
).....27
LXT331 Receive Characteristics (See
Figure 15
)...............................................27
LXT331 Serial I/O Timing Characteristics (See
Figure 16
and
Figure 17
)..........28