DS21448N Maxim Integrated Products, DS21448N Datasheet - Page 37

• 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

TRANSMIT
LINE
Figure 7-2. Protected Interface Using Internal Receive Termination
RECEIVE
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: THE R
NOTE 5: THE 68µF IS USED TO KEEP THE LOCAL POWER PLANE POTENTIAL WITHIN TOLERANCE DURING A SURGE.
NOTE 6: REFER TO APPLICATION NOTE 324 FOR SIDACTOR AND FUSE DETAILS.
FUSE
FUSE
FUSE
FUSE
FOR T1 APPLICATIONS.
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
60
R
R
t
t
(NONPOLARIZED)
0.1µF
60
1.0µF
37 of 60
TTIP
RTIP
TRING
RRING
Semiconductor
DS21448
Dallas
DS21448 3.3V T1/E1/J1 Quad Line Interface
(Table
MCLK
V
V
V
V
DD
SS
DD
SS
7-A). NO RETURN LOSS IS REQUIRED
0.01µF
(THIS CAN ALSO BE 1.544MHz
FOR T1 ONLY OPERATION)
0.1µF
0.1µF
2.048MHz
0.01µF
V
10µF
DD
+
68µF