DS21348TN+ Maxim Integrated Products, DS21348TN+ Datasheet - Page 51

• Manufacturer Part Number: DS21348TN+
• Description: IC LIU T1/E1/J1 3.3V 44-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS21348TN+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Product: Framer
• Number Of Transceivers: 1
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 100 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.4 G.703 Synchronization Signal
The DS21348 can receive a 2.048MHz square-wave synchronization clock as specified in Section 13 of
ITU G.703(10/98). To use the DS21348 in this mode, set the Receive Synchronization Clock Enable
(CCR5.3) = 1. The DS21348 can also transmit the 2.048MHz square-wave synchronization clock as
specified in Section 10 of G.703. To transmit the 2.048MHz clock, set the Transmit Synchronization
Clock Enable (CCR5.2) = 1.
Table 7-1. Line Build-Out Select for E1 in Register CCR4 (ETS = 0)
Note: See
Table 7-2. Line Build-Out Select for T1 in Register CCR4 (ETS = 1)
Note: See
Table 7-3. Transformer Specifications for 3.3V Operation
Turns Ratio 3.3V Applications
Primary Inductance
Leakage Inductance
Intertwining Capacitance
Transmit Transformer DC Resistance
Receive Transformer DC Resistance
L2
L2
0
0
0
0
1
1
1
1
0
0
1
1
Primary (Device Side)
Secondary
Primary (Device Side)
Secondary
Figure
Figure
L1
L1
0
0
1
1
0
0
1
1
0
0
0
0
SPECIFICATION
7-1,
7-1,
L0
Figure
L0
Figure
0
1
0
1
0
1
0
1
0
1
0
1
7-2, and
7-2, and
V
(V)
3.3
3.3
3.3
3.3
V
(V)
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
DD
DD
Figure
Figure
75Ω normal
120Ω normal
75Ω with high return loss
120Ω with high return loss
DSX-1 (0 to 133 feet)/
0dB CSU
DSX-1 (133 to 266 feet)
DSX-1 (266 to 399 feet)
DSX-1 (399 to 533 feet)
DSX-1 (533 to 655 feet)
-7.5dB CSU
-15dB CSU
-22.5dB CSU
7-3. N.M. = Not meaningful.
7-3. N.M. = Not meaningful.
APPLICATION
APPLICATION
1:1 (receive) and 1:2 (transmit) ±2%
600µH minimum
1.0µH maximum
40pF maximum
1.0Ω maximum
2.0Ω maximum
1.2Ω maximum
1.2Ω maximum
51 of 76
RECOMMENDED VALUE
1:2
1:2
1:2
1:2
1:2
1:2
1:2
1:2
1:2
1:2
1:2
1:2
N
N
RETURN LOSS
RETURN LOSS
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
N.M.
(dB)
(dB)
21
21
Rt (Ω)
Rt (Ω)
11.6
6.2
0
0
0
0
0
0
0
0
0
0