DS21348TN+ Maxim Integrated Products, DS21348TN+ Datasheet - Page 53

• 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

Figure 7-2. Protected Interface Using Internal Receive Termination
NOTES:
1. All resistor values are ±1%.
2. C1 = C2 = 0.1µF.
3. S is a 6V transient suppresser.
4. D1 to D8 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 the 60Ω
7. The Rt resistors are used to increase the transmitter return loss
8. The transmit transformer turns ratio (N) would be 1:2 for 3.3V operation.
9. The 68µF is used to keep the local power plane potential within tolerance during a surge.
receive termination resistance must be 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
60
S
S
Rt
Rt
polarized)
1.0µF
(non-
60
D3
D1
D5
D7
53 of 76
C1
C2
+VDD
+VDD
D6
D8
D2
D4
TTIP
TRING
RTIP
RRING
DS21348
(Table
VDD (36)
VSS (35)
VDD (21)
VSS (22)
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