CS61577-IL1R Cirrus Logic Inc, CS61577-IL1R Datasheet - Page 25

• Manufacturer Part Number: CS61577-IL1R
• Description: Network Controller & Processor ICs IC T1/E1 Low PWR Line Interface Unit
• Manufacturer: Cirrus Logic Inc

Specifications of CS61577-IL1R

• Product: Framer
• Number Of Transceivers: 1
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.75 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
Line Interface
Figures A1-A3 show typical T1 and E1 line inter-
face application circuits. Table A1 shows the
external components which are specific to each
application. Figure A1 illustrates a T1 interface in
the Host Mode. Figure A2 illustrates a 120 Ω E1
interface in the Hardware Mode. Figure A3 illus-
trates a 75 Ω E1 interface in the Extended
Hardware Mode.
Frequency
1.544 (T1)
2.048 (E1)
Encoder/
Decoder
Monitor
Control
Format
Frame
MHz
&
XTL
RV+
+
6.176 MHz
8.192 MHz
28
12
11
10
1
5
7
6
8
3
4
2
9
Crystal
68 μF
RGND
XTL
CLKE
ACLKI
LOS
DPM
MODE
RPOS
RNEG
RCLK
TPOS
TNEG
TCLK
XTALIN
XTALOUT
Figure A1. T1 Host Mode Configuration
Table A1. External Component Values
0.1 μF
RGND
+5V
Cable
RV+
100
120
75
Ω
21
22
TV+
TGND
15
14
0/1/1 - 1/1/1
MRING
LEN2/1/0
RRING
TRING
The 1:2 receiver transformer has a grounded cen-
ter tap on the IC side. Resistors R1 and R2
between the RTIP and RRING pins to ground
provide the termination for the receive line. The
transmitter also uses a 1:2 transformer. A 0.47 μF
capacitor is required in series with the transmit
transformer primary. This capacitor is needed to
prevent any output stage imbalance from resulting
in a DC current through the transformer primary.
This current might saturate the transformer pro-
ducing an output offset level shift.
SCLK
MTIP
RTIP
+
SDO
TTIP
0/0/0
0/0/0
0/0/1
SDI
INT
CS
1.0 μF
TGND
27
26
23
24
25
19
20
17
18
16
13
+5V
not used
not used
0.47 μF
not used
100 kΩ
R1
R2
4.4
R3
Ω
Serial
Port
1
3
5
2
6
μP
PE-65351
PE-65351
2CT:1
1:2CT
R1 and R2
2
6
1
5
200
240
150
RECEIVE
LINE
TRANSMIT
LINE
Ω