DS21448L+ Maxim Integrated Products, DS21448L+ Datasheet - Page 39
![IC LIU QUAD E1/T1/J1 128-LQFP](/photos/6/82/68247/128-lqfp_21-0086d_sml.jpg)
DS21448L+
Manufacturer Part Number
DS21448L+
Description
IC LIU QUAD E1/T1/J1 128-LQFP
Manufacturer
Maxim Integrated Products
Type
Line Interface Units (LIUs)r
Datasheet
1.DS21448L.pdf
(60 pages)
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