DS26303LN-75+ Maxim Integrated Products, DS26303LN-75+ Datasheet - Page 29

• Manufacturer Part Number: DS26303LN-75+
• Description: IC LIU E1/T1/J1 3.3V 144-ELQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS26303LN-75+

• Number Of Drivers/receivers: 8/8
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP Exposed Pad, 144-eLQFP, 144-HLQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.1 Register Description
This section details the register description of each bit. Whenever the variable “n” in italics is used in any of the
register descriptions, it represents 1, 2, 3, 4, 5, 6, 7, and 8.
5.1.1
Register Name:
Register Description:
Register Address:
Bit #
Name
Bit 7: Device CODE ID Bit 7 (ID7). This bit is zero for the 75Ω impedance part number and one for the 120Ω
impedance part number.
Bits 6 to 3: Device CODE ID Bits 6 to 3 (ID6 to ID3). These bits tell the user the number of ports the device
contains.
Bits 2 to 0: Device CODE ID Bits 2 to 0 (ID2 to ID0). These bits tell the user the revision of the part. Contact the
factory for details.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 7 to 0: Analog Loopback Configuration Bits Channel n (ALBCn). When this bit is set, LIUn is placed in
analog loopback. TTIPn and TRINGn are looped back to RTIPn and RRINGn. The data at RTIPn and RRINGn is
ignored. The LOS detector is still in operation. The jitter attenuator is in use if enabled for the transmitter or
receiver.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 7 to 0: Remote Loopback Configuration Bits Channel n (RLBCn). When this bit is set, remote loopback is
enabled on LIUn. The analog-received signal goes through the receiver and is looped back to the transmitter. The
data at TPOSn and TNEGn is ignored. The jitter attenuator is in use if enabled. Note: LIUn is placed in dual
loopback if DLBC:DLBCn is also set.
Primary Registers
RLBC8
ALBC8
ID7
7
7
0
7
0
ALBC7
RLBC7
ID6
6
6
0
6
0
ID
Identification Register
00h
ALBC
Analog Loopback Configuration Register
01h
RLBC
Remote Loopback Configuration Register
02h
ALBC6
RLBC6
ID5
5
5
0
5
0
DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
ALBC5
RLBC5
29 of 101
ID4
4
4
0
4
0
RLBC4
ALBC4
ID3
3
3
0
3
0
RLBC3
ALBC3
ID2
2
2
0
2
0
RLBC2
ALBC2
ID1
1
1
0
1
0
RLBC1
ALBC1
ID0
0
0
0
0
0