DS21448LDK Maxim Integrated Products, DS21448LDK Datasheet - Page 38
![no-image](/images/manufacturer_photos/0/4/417/maxim_integrated_products_sml.jpg)
DS21448LDK
Manufacturer Part Number
DS21448LDK
Description
KIT DESIGN LIU DS21448L T1/J1/E1
Manufacturer
Maxim Integrated Products
Datasheet
1.DS21448L.pdf
(60 pages)
Specifications of DS21448LDK
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Figure 7-3. Protected Interface Using External Receive Termination
RECEIVE
LINE
TRANSMIT
LINE
NOTE 1: ALL RESISTOR VALUES ARE ±1%.
NOTE 2: S IS A SIDACTOR.
NOTE 3: THE FUSES ARE OPTIONAL TO PREVENT AC POWER LINE CROSSES FROM COMPROMISING THE TRANSFORMERS.
NOTE 4: R
NOTE 5: THE R
NOTE 6: THE 68µF IS USED TO KEEP THE LOCAL POWER PLANE POTENTIAL WITHIN TOLERANCE DURING A SURGE.
NOTE 7: REFER TO APPLICATION NOTE 324 FOR SIDACTOR AND FUSE DETAILS.
FUSE
FUSE
FUSE
FUSE
T1 APPLICATIONS.
r
= 37.5Ω FOR 75Ω OR 60Ω FOR 120Ω E1 SYSTEMS, OR 50Ω FOR 100Ω T1 LINES.
T
RESISTORS ARE USED TO INCREASE THE TRANSMITTER RETURN LOSS
S
S
(LARGER WINDING TOWARD
S
S
S
S
THE NETWORK)
2:1
1:1
S
S
R
r
R
R
t
t
(NONPOLARIZED)
R
0.1µF
r
1.0µF
38 of 60
470
470
RTIP
TTIP
TRING
RRING
Semiconductor
DS21448
Dallas
DS21448 3.3V T1/E1/J1 Quad Line Interface
(Table
MCLK
V
V
V
V
DD
DD
SS
SS
7-A). NO RETURN LOSS IS REQUIRED FOR
0.01µF
(THIS CAN ALSO BE 1.544MHz
FOR T1 ONLY OPERATION)
0.1µF
0.1µF
2.048MHz
0.01µF
V
10µF
DD
+
68µF
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