XR-T5793
...the analog plus company
TM
Quad E1
Line Interface Unit
Rev. 2.00
E
1995
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
FAX (510) 668-7017
1
June 1997-3
FEATURES
D
Meets CCITT G.703 Pulse Mask Template for
2.048Mbps (E1) Rates
D
Transmitter and Receiver Interfaces Can Be:
Single Ended, 75
Capacitive or Transformer
Coupled
Balanced, 100
or 120
Transformer Coupled
D
Minimum Return Loss is 20dB (Receive) and 18dB
(Transmit), Exceeds G.703 and ETSI 300 166
Specifications
D
Bipolar Outputs Can Be Disabled Individually (High
Z Outputs)
D
System Interface is TTL Compatible on Digital Input
and TTL/CMOS Compatible on Digital Output Pins
D
Individual Channel Loss of Signal Detection, Local
and Remote Digital Loopback
D
Low Power, CMOS Technology
D
Over-Temperature Protection
APPLICATIONS
D
Multi-Line E1 Interface Cards
D
E1 Network Equipment
Multiplexers
Cross Connects
Switching Systems
D
Fault Tolerant Systems
GENERAL DESCRIPTION
The XR-T5793 is an optimized line interface unit, built
using low power CMOS technology. This device contains
four independent E1 channels for primary rate, PCM
applications up to 2.048Mbps. Each channel performs
the driver and receiver functions necessary to convert
bipolar signals to TTL/CMOS compatible logic levels and
vice versa. The device supports single ended or balanced
line interfaces on each channel, thereby providing the
user an option of reducing system cost and board space
by replacing the transformer with a capacitor.
Each of the four drivers can be independently disabled,
allowing maximum flexibility in system power
management. Output pulses are fully CCITT G.703
compliant. Moreover, the return loss is at least 18dB over
a frequency range of 51kHz to 3.072MHz.
The slicing circuit in the receive path is able to tolerate a
maximum of 12dB of cable loss with a minimum input
sensitivity of 600mV over the operating temperature
range. Return loss on the receive interfaces is minimum
20dB from 51kHz to 3.072MHz.
Local and remote loopbacks can be performed on any of
the four channels. A separate loss of signal (LOS)
detection circuitry and a LOS pin is provided for each
input.
The XR-T5793 is targeted for multi-line E1 line card
applications where real estate and low power
consumption are critical. Also, the device may be used in
T1 applications (1.544Mbps) which do not require
meeting the DSX-1 cross connect pulse template. The
XR-T5793 is pin compatible with the XR-T5794, which
supports a fifth channel. The fifth channel is for
redundancy and dedicated monitoring on any of the eight
bipolar paths.
ORDERING INFORMATION
Part No.
Package
Operating
Temperature Range
XR-T5793IJ
68 Lead PLCC
-40
C to +85
C
XR-T5793IV
80 Lead TQFP (14 x 14 x 1.4 mm)
-40
C to +85
C
XR-T5793
2
Rev. 2.00
BLOCK DIAGRAM
0.1
F
TIP
RX INPUT
TIP
RING
TX OUTPUT
TIP
RING
TIP
0.1
F
75
RXIN
100
or
120
LOOPEN
E1/T1-
LOOPSEL (1.0)
TXOUT
TXEN
Rout
1
Level
Detector
Transceiver 4
LOS
RXPOS
RXNEG
TXNEG
Slicer
Peak
Detector
Slice
Voltage
TXPOS
TCLK
Driver
L
o
c
a
l
/
R
e
m
o
t
e
L
o
o
p
b
a
c
k
Transceiver 3
Transceiver 2
Transceiver 1
Figure 1. Block Diagram
Impedance Selectable
Receivers. Return
Loss Exceeds G7.03.
120
Balanced
(or 100
)
LOS Threshold Based on G.775
Impedance
Selectable
Tristate
Drivers Return
Loss Exceeds
ETSI 300 166
120
,100
or
75
Balanced
75
Unbalanced
(Without Transformer)
75
Unbalanced
(Without Transformer)
R
OUT
1
LPMOD
Note
1
R
OUT
= 68
for 120
line impedance, R
OUT
= 62
for 100
line impedance, R
OUT
= 68
for 75
line impedance
PE-65834
TTI-7148
PE-65839
TTI-7149
XR-T5793
3
Rev. 2.00
PIN CONFIGURATION
68 Lead PLCC
TXEN3
TXEN4
TXOUT4
TV
TV
TXOUT3
AGND
TV
NC
TV
AGND
TXOUT2
TV
TXOUT1
TXEN1
TXEN2
LPMOD4
LPMOD3
RXIN4
LOS4
LOS3
RXIN3
NC
NC
RGND
RGND
NC
RXIN2
LOS1
LOS2
RXIN1
LPMOD2
LPMOD1
LOSLVS
TXCLK2
TXPOS2
TXNEG2
TXCLK1
TXPOS1
TXNEG1
LOOPEN2
LOOPEN1
E1/T1
RXPOS2
RXNEG2
RXPOS1
RXNEG1
NC
TXCLK4
TXPOS4
TXNEG4
TXCLK3
TXPOS3
TXNEG3
LOOPEN4
LOOPEN3
GND
RXPOS3
RXNEG3
RXPOS4
RXNEG4
TV
DD
SS
SS
DD
AV
SS
V
SS
RV
SS
V
DD
RV
DD
80 Lead TQFP (14 x 14 x 1.4 mm)
60
41
40
21
1
20
61
80
NC
AV
AV
TXCLK4 TXPOS4 TXNEG4 TXCLK3 TXPOS3 TXNEG3
LOOPEN4
LOOPEN3
GND
V
RXPOS3
RXNEG3
RXPOS4
RXNEG4
RV
LPMOD4
LPMOD3
RXIN4
LOS4
LOS3
RXIN3
RGND
RGND
RGND
RXIN2
LOS1
LOS2
RXIN1
LPMOD2
NC
NC
RV
RXNEG1
RXPOS1
RXNEG2
RXPOS2
V
E1/T1-
LOOPEN1
LOOPEN2
TXNEG1
TXPOS1
TXCLK1
TXNEG2
TXPOS2
TXCLK2
AV
LOSL
VS
DD
DD
DD
DD
RV
DD
SS
RV
SS
SS
SS
AV
SS
AV
SS
NC
NC
TXEN2
TXEN1
TXOUT1
TV
DD
TV
SS
TXOUT2
AGND
TV
DD
AGND
TXOUT3
TV
SS
TV
DD
TXOUT4
TXEN4
TXEN3
NC
TV
SS
DD
SS
NC
NC
NC
NC
LPMOD1
NC
AV
DD
1
9
61
60
44
43
27
26
10
XR-T5793
4
Rev. 2.00
PIN DESCRIPTION
PLCC
Pin #
SQFP
Pin #
Symbol
Type
Description
1
71
NC
No Connect.
2
72
TV
DD
V
DD
Transmit V
DD.
)
5V (
$
5%).
3
73
AGND
GND
Analog Ground.
4
74
TXOUT3
O
Transmitter 3 Output. Transmitter 3 bipolar output connected to coupling
capacitor or pulse transformer by a resistor.
5
75
TV
SS
V
SS
Transmit V
SS.
-5V (
$
5%).
6
76
TV
DD
V
DD
Transmit V
DD.
+5V (
$
5%).
7
77
TXOUT4
O
Transmitter 4 Output. Transmitter 4 bipolar output connected to coupling
capacitor or pulse transformer by a resistor.
8
78
TXEN4
I
Transmitter 4 Output Enable. If driven high the transmitter 4 output drivers
are enabled. Hi-Z otherwise.
9
79
TXEN3
I
Transmitter 3 Output Enable. If driven high the transmitter 3 output drivers
are enabled. Hi-Z otherwise.
10
1, 2, 80
NC
NC
No Connect.
11
3,4
AV
DD
V
DD
Analog V
DD.
12
5
TXCLK4
I
Transmitter 4 Clock Input. Apply logic one when RZ signals are supplied to
data inputs.
13
6
TXPOS4
I
Transmitter 4 Positive Data In. Positive data input in NRZ or RZ format for
transmitter 4.
14
7
TXNEG4
I
Transmitter 4 Negative Data In. Negative data input in NRZ or RZ format for
transmitter 4.
15
8
TXCLK3
I
Transmitter 3 Clock Input. Apply logic one when RZ signals are supplied to
data inputs.
16
9
TXPOS3
I
Transmitter 3 Positive Data in. Positive data input in NRZ or RZ format for
transmitter 3.
17
10
TXNEG3
I
Transmitter 3 Negative Data In. Negative data input in NRZ or RZ format for
transmitter 3.
18
11
LOOPEN4
I
Loop Enable 4. If driven high the specified loop type will be enabled for
channel 4. Otherwise normal operation will continue.
19
12
LOOPEN3
I
Loop Enable 3. If driven high the specified loop type will be enabled for
channel 3. Otherwise normal operation will continue.
20
13
GND
GND
Digital Ground.
21
14
V
DD
V
DD
Digital V
DD
. +5V (
$
5%).
22
15
RXPOS3
O
Receiver 3 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 3.
23
16
RXNEG3
O
Receiver 3 Positive Data Out. Negative data output in NRZ or RZ format for
receiver 3.
24
17
RXPOS4
O
Receiver 4 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 4.
25
18
RXNEG4
O
Receiver 4 Positive Data Out. Negative data output in NRZ or RZ format for
receiver 4.
26
19,20
RV
DD
V
DD
Receive V
DD.
+5V (
$
5%).
XR-T5793
5
Rev. 2.00
PIN DESCRIPTION (CONT'D)
PLCC
Pin #
SQFP
Pin #
Symbol
Type
Description
27
21
LPMOD4
I
Loop Mode 4. If driven high the loopback mode of channel 4 will be set to re-
mote loop. Otherwise theloopback mode will remain at local loop. The
actualloopback will be activated when the LOOPEN4 is asserted.
28
22
LPMOD3
I
Loop Mode 3. If driven high the loopback mode of channel 3 will be set to re-
mote loop. Otherwise the loopback mode will remain at local loop. The
actual loopback will be activated when the LOOPEN3 is asserted.
29
23
RXIN4
I
Receiver 4 Input. Receiver 4 bipolar input connected to coupling capacitor or
pulse transformer.
30
24
LOS4
O
Receiver 4 Loss of Signal. Asserted during LOS condition. Clear otherwise.
31
25
LOS3
O
Receiver 3 Loss of Signal. Asserted during LOS condition. Clear otherwise.
32
26
RXIN3
I
Receiver 3 Input. Receiver 3 bipolar input connected to coupling capacitor or
pulse transformer.
33
27
NC
No Connect.
34
28
NC
No Connect.
35
29, 30
RGND
GND
Receive Ground.
36
31
RGND
GND
Receive Ground.
37
32
NC
No Connect.
38
33
RXIN2
I
Receiver 2 Input. Receiver 2 bipolar input connected to coupling capacitor or
pulse transformer.
39
34
LOS1
O
Receiver 1 Loss of Signal. Asserted during LOS condition. Clear otherwise.
40
35
LOS2
O
Receiver 2 Loss of Signal. Asserted during LOS condition. Clear otherwise.
41
36
RXIN1
I
Receiver 1 Input. Receiver 1 bipolar input connected to coupling capacitor or
pulse transformer.
42
37
LPMOD2
I
Loop Mode 2. If driven high the loopback mode of channel 2 will be set to re-
mote loop. Otherwise the loopback mode will remain at local loop. The
actual loopback will be activated when the LOOPEN2 is asserted.
43
38
LPMOD1
I
Loop Mode 1. If driven high the loopback mode of channel 1 will be set to re-
mote loop. Otherwise the loopback mode will remain at local loop. The
actual loopback will be activated when the LOOPEN1 is asserted.
-
39, 40
NC
NC
No Connect.
44
41,42
RV
SS
V
SS
Receive V
SS.
-5V (
$
5%).
45
43
RXNEG1
O
Receiver 1 Negative Data Out. Negative data output in NRZ or RZ format for
receiver 1.
46
44
RXPOS1
O
Receiver 1 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 1.
47
45
RXNEG2
O
Receiver 2 Negative Data Out. Negative data output in NRZ or RZ format for
receiver 2.
48
46
RXPOS2
O
Receiver 2 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 2.
49
47
V
SS
V
SS
Digital V
SS.
-5V (
$
5%).
50
48
E1/T1-
I
E1/T1- Selection. Apply logic one to select the receive data threshold
appropriate for E1 operation. Connect to ground to select the T1 data
threshold.
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