DS21348G Maxim Integrated Products, DS21348G Datasheet - Page 54

• Manufacturer Part Number: DS21348G
• Description: IC LIU T1/E1/J1 3.3V 49-BGA
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

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: Contains lead / RoHS non-compliant

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