DS21448N Maxim Integrated Products, DS21448N Datasheet - Page 39

• Manufacturer Part Number: DS21448N
• Description: Network Controller & Processor ICs 3.3V Quad E1-T1-J1 L ine Interface T1-E1-
• Manufacturer: Maxim Integrated Products

Specifications of DS21448N

• 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: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TEBGA
• 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