DS21458LDK Maxim Integrated, DS21458LDK Datasheet - Page 173
DS21458LDK
Manufacturer Part Number
DS21458LDK
Description
Network Controller & Processor ICs
Manufacturer
Maxim Integrated
Datasheet
1.DS21458LDK.pdf
(269 pages)
- Current page: 173 of 269
- Download datasheet (2Mb)
25.8 Recommended Circuits
Figure 25-5. Software-Selected Termination, Metallic Protection
Table 25-6. Component List (Software-Selected Termination, Metallic
Protection)
75/100/110/120
Twisted Pair/Coax
75/100/110/120
Twisted Pair/Coax
Design Notes:
1
2
Choke is optional but should be included when necessary for common mode noise reduction.
Decoupling capacitors need to be placed near device power pins
Note 1:
Note 2:
Note 3:
Note 4:
T1 and T2
T3 and T4
F1 and F2
S1 and S2
S3 andS4
NAME
T3 and T4 are optional. For more information, contact the Telecom Support Group at
telecom.support@dalsemi.com.
The layout from the transformers to the network interface is critical. Traces should be at least 25
mils wide and separated from other circuit lines by at least 150 mils. The area under this portion
of the circuit should not contain power planes.
Some T1 (never in E1) applications source or sink power from the network-side center taps of
the Rx/Tx transformers.
A list of transformer part numbers and manufacturers is available by contacting
telecom.support@dalsemi.com.
F1
F2
1.25A slow blow fuse
25V (max) transient suppressor
77V (max) transient suppressor
Transformer 1:1CT and 1:2CT (3.3V, SMT)
Dual common-mode choke (SMT)
S3
S4
T3
T4
1
1
2:1
1:1
T2
T1
DESCRIPTION
173 of 269
60
S1
S2
1.0 F
0.1 F
60
DS21455/DS21458 Quad T1/E1/J1 Transceivers
TTIP
TRING
RTIP
RRING
Dallas Semiconductor
T1/E1/J1 SCT or LIU
DVDD
DVSS
TVDD
TVSS
RVDD
RVSS
0.01 F
0.1 F
0.1 F
2
2
2
VCC
VCC
VCC
0.1 F
68 F
2
2
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