DS26521L+ Maxim Integrated Products, DS26521L+ Datasheet - Page 71

• Manufacturer Part Number: DS26521L+
• Description: IC TXRX T1/E1/J1 64-LQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS26521L+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 44.736 Mbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 220 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.11.2.1
The DS26521 transmitters can be selected individually to meet the pulse templates for E1 and T1/J1 modes. The
T1/J1 pulse template is shown in
shape can be configured for each LIU on an individual basis. The LIU transmit impedance selection registers can
be used to select an internal transmit terminating impedance of 100Ω for T1, 110Ω for J1 mode, 75Ω or 120Ω for
E1 mode or no internal termination for E1 or T1 mode. The transmit pulse shape and terminating impedance is
selected by
measured for compliance at the appropriate network interface (NI). For T1 long haul and E1, the pulse shape is
measured at the far end. For T1 short haul, the pulse shape is measured at the near end.
Figure 8-18. T1/J1 Transmit Pulse Templates
LTITSR
DSX - 1 Template (pe r ANSI T1.102-1993
Transmit-Line Pulse Shapes
- 0.1
- 0.2
- 0.3
- 0.4
- 0.5
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
- 500
registers. The pulse shapes will be complaint to T1.102 and G.703. Pulse shapes are
MAXIMUM CURVE
- 0.77
- 0.39
- 0.27
- 0.27
- 0.12
0.00
0.27
0.35
0.93
1.16
UI
- 400
Time
- 500
- 255
- 175
- 175
- 75
0
175
225
600
750
T1.102/87, T1.403,
CB 119 (Oct. 79), &
I.431 Template
- 300
Amp.
0.05
0.05
0.80
1.15
1.15
1.05
1.05
- 0.07
0.05
0.05
Figure
- 200
- 0.77
- 0.23
- 0.23
- 0.15
0.00
0.15
0.23
0.23
0.46
0.66
0.93
1.16
MINIMUM CURVE
UI
8-18. The E1 pulse template is shown in
Tim e
- 500
- 150
- 150
- 100
0
100
150
150
300
430
600
750
- 100
Amp.
-0.05
-0.05
0.50
0.95
0.95
0.90
0.50
-0.45
-0.45
-0.20
-0.05
-0.05
0
71 of 258
TIME (ns)
DS1 Template (per ANSI T1.403-1995
100
MAXIMUM CURVE
-0.77
-0.39
-0.27
-0.27
-0.12
0.00
0.27
0.34
0.77
1.16
UI
Time
-500
-255
-175
-175
-75
0
175
225
600
750
200
Amp.
0.05
0.05
0.80
1.20
1.20
1.05
1.05
-0.05
0.05
0.05
300
-0.77
-0.23
-0.23
-0.15
0.00
0.15
0.23
0.23
0.46
0.61
0.93
1.16
MINIMUM CURVE
UI
400
DS26521 Single T1/E1/J1 Transceiver
Time
-500
-150
-150
-100
0
100
150
150
300
430
600
750
500
Figure
Amp.
-0.05
-0.05
0.50
0.95
0.95
0.90
0.50
-0.45
-0.45
-0.26
-0.05
-0.05
600
8-19. The transmit pulse
700