DS21348T+ Maxim Integrated Products, DS21348T+ Datasheet - Page 52

• Manufacturer Part Number: DS21348T+
• Description: IC LIU T1/E1/J1 3.3V 44-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS21348T+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Product: Framer
• Number Of Transceivers: 1
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 100 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 7-1. Basic Interface
NOTES:
1) All resistor values are ±1%.
2) In E1 applications, the Rt resistors are used to increase the transmitter return loss
3) The Rr resistors should be set to 60Ω each if the internal receive-side termination feature is enabled.
4) See
Transmit
return loss is required for T1 applications.
When this feature is disabled, Rr = 37.5Ω for 75Ω or 60Ω for 120Ω E1 systems, or 50Ω for 100Ω
T1 lines.
Receive
Line
Line
Table 7-1
and
toward the network)
Table 7-2
(larger winding
N:1
1:1
0.1µF
Rr
for the appropriate transmit transformer turns ratio (N).
Rt
Rt
Rr
polarized)
1.0µF
(non-
52 of 76
TTIP
TRING
RTIP
RRING
DS21348
VDD (21)
VSS (22)
VDD (36)
VSS (35)
MCLK
0.01µF
0.1µF
0.1µF
2.048MHz
(this clock can also
be 1.544MHz for T1
only applications)
10µF
10µF
(Table
+VDD
7-1). No