DS2148 データシートの表示（PDF） - Maxim Integrated

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DS2148

5V E1/T1/J1 Line Interface Unit

Maxim Integrated 

DS2148/DS21Q48

LIST OF TABLES

Table 2-1. Bus Interface Selection ...........................................................................................................10

Table 2-2. Pin Assignment in Parallel Port Mode .....................................................................................10

Table 2-3. Pin Descriptions in Parallel Port Mode (Sorted by Pin Name, DS2148T) ...............................12

Table 2-4. Pin Assignment in Serial Port Mode ........................................................................................14

Table 2-5. Pin Descriptions in Serial Port Mode (Sorted by Pin Name, DS2148T) ..................................15

Table 2-6. Pin Assignment in Hardware Mode .........................................................................................17

Table 2-7. Pin Description in Hardware Mode (Sorted by Pin Name, DS2148T) .....................................18

Table 2-8. Loopback Control in Hardware Mode ......................................................................................20

Table 2-9. Transmit Data Control in Hardware Mode ...............................................................................20

Table 2-10. Receive Sensitivity Settings ..................................................................................................20

Table 2-11. Monitor Gain Settings ............................................................................................................20

Table 2-12. Internal Rx Termination Select ..............................................................................................20

Table 2-13. MCLK Selection.....................................................................................................................20

Table 3-1. Register Map ...........................................................................................................................23

Table 4-1. MCLK Selection.......................................................................................................................29

Table 4-2. Receive Sensitivity Settings ....................................................................................................31

Table 4-3. Backplane Clock Select...........................................................................................................32

Table 4-4. Monitor Gain Settings ..............................................................................................................32

Table 4-5. Internal Rx Termination Select ................................................................................................33

Table 5-1. Received Alarm Criteria ..........................................................................................................35

Table 5-2. Receive Level Indication .........................................................................................................38

Table 6-1. Transmit Code Length .............................................................................................................40

Table 6-2. Receive Code Length..............................................................................................................40

Table 6-3. Definition of Received Errors...................................................................................................44

Table 6-4. Function of ECRS Bits and RNEG Pin ....................................................................................45

Table 7-1. Line Build-Out Select for E1 in Register CCR4 (ETS = 0).......................................................48

Table 7-2. Line Build-Out Select for T1 in Register CCR4 (ETS = 1).......................................................48

Table 7-3. Transformer Specifications for 5V Operation ..........................................................................48

Table 8-1. DS21Q48 Pin Assignment.......................................................................................................55

Table 9-1. Recommended DC Operating Conditions ...............................................................................59

Table 9-2. Capacitance ............................................................................................................................59

Table 9-3. DC Characteristics ..................................................................................................................59

Table 9-4. Thermal Characteristics—DS21Q48 CSBGA Package...........................................................60

Table 9-5. Theta-JA (θJA) vs. Airflow ........................................................................................................60

Table 10-1. AC Characteristics—Multiplexed Parallel Port (BIS1 = 0, BIS0 = 0) ....................................61

Table 10-2. AC Characteristics—Nonmultiplexed Parallel Port (BIS1 = 0, BIS0 = 1)..............................64

Table 10-3. AC Characteristics—Serial Port (BIS1 = 1, BIS0 = 0) ...........................................................67

Table 10-4. AC Characteristics—Receive Side ........................................................................................68

Table 10-5. AC Characteristics—Transmit Side .......................................................................................69

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