DS21448L+ Maxim Integrated Products, DS21448L+ Datasheet - Page 39

• Manufacturer Part Number: DS21448L+
• Description: IC LIU QUAD E1/T1/J1 128-LQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS21448L+

• Number Of Drivers/receivers: 4/4
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP
• Product: Framer
• Number Of Transceivers: 4
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 400 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 7-4. Dual Connector-Protected Interface Using Receive Termination
BALANCED LINE
(100Ω/120Ω)
UNBALANCED
LINE (75Ω)
UNBALANCED
LINE (75Ω)
BALANCED LINE
(100Ω/120Ω)
NOTE 1: REFER TO APPLICATION NOTE 384 FOR A COMPLETE DISCUSSION OF THIS CIRCUIT.
NOTE 2: ALL RESISTOR VALUES ARE ±1%.
NOTE 3: THE FUSES ARE OPTIONAL TO PREVENT AC POWER LINE CROSSES FROM COMPROMISING THE TRANSFORMERS.
NOTE 4: S IS A SIDACTOR.
NOTE 5: THE R
NOTE 6: THE 68 µ F IS USED TO KEEP THE LOCAL POWER PLANE POTENTIAL WITHIN TOLERANCE DURING A SURGE.
FOR T1 APPLICATIONS.
T
51.1
RESISTORS ARE USED TO INCREASE THE TRANSMITTER RETURN LOSS
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
S
S
S
S
S
S
S
S
0.22µF
0.22µF
L1
L1
0.22µF
0.22µF
1.6:1
0.8:1
0.8:1:1CT
2:1
1:1
0.8:1:1CT
39 of 60
60
S
S
1.0µF
0.1µF
60
R
R
t
t
(Table 7-C).
RTIP
TTIP
TRING
RRING
Semiconductor
DS21448
Dallas
NO RETURN LOSS IS REQUIRED
MCLK
V
V
V
V
DD
DD
SS
SS
0.01µF
0.1µF
2.048MHz (THIS CAN ALSO
BE 1.544MHz FOR T1 ONLY
OPERATION)
0.1µF
10µF
0.01µF
V
DD
+
68µF