DS21348G+ Maxim Integrated Products, DS21348G+ Datasheet - Page 54
![IC LIU T1/E1/J1 3.3V 49-BGA](/photos/6/86/68679/49-csbga_21-0356_sml.jpg)
DS21348G+
Manufacturer Part Number
DS21348G+
Description
IC LIU T1/E1/J1 3.3V 49-BGA
Manufacturer
Maxim Integrated Products
Type
Line Interface Units (LIUs)r
Datasheet
1.DS21348G.pdf
(76 pages)
Specifications of DS21348G+
Number Of Drivers/receivers
1/1
Protocol
T1/E1/J1
Voltage - Supply
3.135 V ~ 3.465 V
Mounting Type
Surface Mount
Package / Case
49-CSBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Figure 7-3. Protected Interface Using External Receive Termination
NOTES:
1. All resistor values are ±1%.
2. C1 = 0.1µF.
3. S is a 6V transient suppresser.
4. D1 to D4 are Schottky diodes.
5. The fuses are optional to prevent AC power line crosses from compromising the transformers.
6. Rp resistors exist to keep the Fuses from opening during a surge. If they are used, then Rr must be
7. Rr = 37.5Ω for 75Ω or 60Ω for 120Ω E1 systems, or 50Ω for 100Ω T1 lines.
8. The Rt resistors are used to increase the transmitter return loss
9. The transmit transformer turns ratio (N) would be 1:2 for 3.3V operation.
10. The 68µF is used to keep the local power plane potential within tolerance during a surge.
adjusted to match the line impedance.
for T1 applications.
Transmit
Receive
Line
Line
Fuse
Fuse
Fuse
Fuse
(optional)
(optional)
Rp
Rp
Rp
Rp
toward the network)
(larger winding
N:1
1:1
0.1µF
Rr
S
Rt
Rt
Rr
470
polarized)
470
1.0µF
(non-
D3
D1
54 of 76
C1
+VDD
D2
D4
TTIP
TRING
RTIP
RRING
DS21348
(Table
VDD (21)
VSS (22)
VDD (36)
VSS (35)
MCLK
7-1). No return loss is required
0.01µF
0.1µF
0.1µF
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
10µF
10µF
+VDD
68µF
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