Exar
Corporation 48720 Kato Road, Fremont CA, 94538
(510) 668-7000
FAX (510) 668-7017
www.exar.com
PRELIMINARY
XRT81L17
SEVEN CHANNEL T1 TRANSCEIVER WITH CLOCK RECOVERY UNIT
OCTOBER 2002
REV. P1.0.0
GENERAL DESCRIPTION
The XRT81L17 is a fully integrated Seven Channel
line interface unit with clock recovery circuit for
T1(1.544Mbps) 100
,
applications.
Each channel consists of a receiver with equalizer for
reliable data and clock recovery, and a transmitter
which accepts either a single or dual-rail inputs for
signal transmission to the line using low impedance
line driver.
The XRT81L17 provides both Serial microprocessor
interface as well as Hardware mode for programming
and control. The B8ZS encoding and decoding
functions are included in the device that can be
disabled as demanded by the system.
The XRT81L17 provides a variety of loop-back and
diagnostic features. This device uses a low power
CMOS design and requires only a single 3.3V supply
and all digital inputs are 5V tolerant.
FEATURES
Fully integrated seven channel transceivers with
clock recovery units for T1 applications.
On-chip Receive Equalizer and Transmit Pulse
Shaper for DS1 Digital Cross Connect.
On-chip Clock Recovery Circuit
On-chip Encoder and Decoder that can either be
enabled or disabled.
Detects and Clears LOS (Loss of Signal)
Logic inputs accept either 3.3V or 5V levels.
Operates over Industrial Temperature range.
Supports Analog, Remote, Digital Loop-Back
Modes
Supports both Hardware and Serial Microprocessor
interface for programming
Low power dissipation
Single +3.3V Supply Operation
128 pin TQFP package
APPLICATIONS
T1 Digital Cross-Connects (DSX-1)
ISDN Primary Rate Interface
CSU/DSU T1 Interface
LAN/WAN Routers
Public switching Systems and PBX Interfaces
T1 Multiplexer and Channel Banks
F
IGURE
1. B
LOCK
D
IAGRAM
OF
THE
XRT81L17
Channe
l 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
TAOS
Channel 7
Timing
Generator
MClk
Encoder
MUX
Timing
Control
TX Pulse
Shaper
TClk
TPOS/TDATA
TNEG/CODE
TTIP
TRing
Remote
Loopback
TClkP
Decoder
Data & Timing
Recovery
Peak
Detector
Receive
Equalizer
Line
Driver
RClk
RPOS
RClkP
RTIP
RRing
LOS
Detect
LOS
Local
Loopback
Serial
Processor
Interface
SDI
SDO
SClk
CS
MUX
Analog
Loopback
RNEG/LCV
XRT81L17
SEVEN CHANNEL T1 TRANSCEIVER WITH CLOCK RECOVERY UNIT
REV. P1.0.0
PRELIMINARY
2
ORDERING INFORMATION
P
ART
N
UMBER
P
ACKAGE
O
PERATING
T
EMPERATURE
R
ANGE
XRT81L17IV
128 Lead TQFP (14 x 14 x 1.4mm)
-40
C to +85
C
F
IGURE
2. P
IN
O
UT
OF
THE
XRT81L17
R CLK _6
R NE G _6/LC V _6
R P O S _6/R DA TA _6
R LO S _6
R CLK _5
R NE G _5/LC V _5
R P O S _5/R DA TA _5
R LO S _5
V D D
G ND
TC LK _5
TP O S _5/TD A TA _5
TN E G _5/C O D E _5
TA O S _5
C S /B 3
S C lk /B 2
R /W /B 1
S D I/O /LB M
TA O S _6
TN E G _6/C O D E _6
TP O S _6/TD A TA _6
TC LK _6
G ND
V D D
TA O S _4
TN E G _4/C O D E _4
TP O S _4/TD A TA _4
TC LK _4
R LO S _4
R P O S _4/R DA TA _4
R NE G _4/LC V _4
R CLK _4
X R T 8 1 L 1 7
R NE G _1/LC V _1
R P O S _1/R DA TA _1
R LO S _3
R CLK _3
R NE G _3/LC V _3
R P O S _3/R DA TA _3
A V DD
A G N D
TC LK _1
TP O S _1/TD A TA _1
TN E G _1/C O D E _1
TA O S _1
TC LK _3
TP O S _3/TD A TA _3
TN E G _3/C O D E _3
TA O S _3
TA O S _2
TN E G _2/C O D E _2
TP O S _2/TD A TA _2
TC LK _2
TA O S _0
TN E G _0/C O D E _0
TP O S _0/TD A TA _0
TC LK _0
G ND
V D D
R P O S _2/R DA TA _2
R NE G _2/LC V _2
R CLK _2
R LO S _2
R P O S _0/R DA TA _0
R NE G _0/LC V _0
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
R
C
LK
_1
RL
O
S
_
1
IC
T
RT
I
P
_
1
RR
I
N
G
_
1
PD
T
x
_
1
TT
I
P
_
1
TV
D
D
_
1
TR
I
N
G
_
1
TG
N
D
_
1
PD
T
x
_
3
TT
I
P
_
3
TV
D
D
_
3
TR
I
N
G
_
3
TG
N
D
_
3
AV
D
D
RT
I
P
_
3
RR
I
N
G
_
3
AG
N
D
RT
I
P
_
5
RR
I
N
G
_
5
PD
T
x
_
5
TT
I
P
_
5
TV
D
D
_
5
TR
I
N
G
_
5
TG
N
D
_
5
MC
L
K
SR
/
D
R
RT
I
P
_
6
RR
I
N
G
_
6
TC
L
K
P
RC
L
K
P
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
R
C
LK
_0
RL
O
S
_
0
R
ESE
T
/
L
B
E
N
RT
I
P
_
0
RR
I
N
G
_
0
PD
T
x
_
0
TT
I
P
_
0
TV
D
D
_
0
TR
I
N
G
_
0
TG
N
D
_
0
PD
T
x
_
2
TT
I
P
_
2
TV
D
D
_
2
TR
I
N
G
_
2
TG
N
D
_
2
AV
D
D
RT
I
P
_
2
RR
I
N
G
_
2
AG
N
D
RT
I
P
_
4
RR
I
N
G
_
4
PD
T
x
_
4
TT
I
P
_
4
TV
D
D
_
4
TR
I
N
G
_
4
TG
N
D
_
4
PD
T
x
_
6
TT
I
P
_
6
TV
D
D
_
6
TR
I
N
G
_
6
TG
N
D
_
6
MO
D
E
XRT81L17
SEVEN CHANNEL T1 TRANSCEIVER WITH CLOCK RECOVERY UNIT
PRELIMINARY
REV. P1.0.0
3
ORDERING INFORMATION
P
ART
N
UMBER
P
ACKAGE
O
PERATING
T
EMPERATURE
R
ANGE
XRT81L17IV
14 x 14 x 1.4 mm 128 Pin TQFP
-40
C to +85
C
PACKAGE DIMENSIONS - 14X14 MM, 128 PIN PACKAGE
128 LEAD THIN QUAD FLAT PACK
(14 x 14 x 1.4 mm, TQFP)
MIN
MAX
MIN
MAX
A
0.055
0.063
1.40
1.60
A1
0.002
0.006
0.05
0.15
A2
0.053
0.057
1.35
1.45
B
0.005
0.009
0.13
0.23
C
0.004
0.008
0.09
0.20
D
0.622
0.638
15.80
16.20
D1
0.547
0.555
13.90
14.10
e
L
0.018
0.030
0.45
0.75
0
o
7
o
0
o
7
o
Note: The control dimension is in millimeter.
SYMBOL
INCHES
MILLIMETERS
0.0157BSC
0.40BSC
Seating Plane
A
2
A
1
C
L
A
33
64
65
96
128
97
D
D
1
D
D
1
B
e
1
32
Rev. 1.00
XRT81L17
SEVEN CHANNEL T1 TRANSCEIVER WITH CLOCK RECOVERY UNIT
PRELIMINARY
REV. P1.0.0
4
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order
to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of
any circuits described herein, conveys no license under any patent or other right, and makes no
representation that the circuits are free of patent infringement. Charts and schedules contained here in are
only for illustration purposes and may vary depending upon a user's specific application. While the
information in this publication has been carefully checked; no responsibility, however, is assumed for
inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where
the failure or malfunction of the product can reasonably be expected to cause failure of the life support
system or to significantly affect its safety or effectiveness. Products are not authorized for use in such
applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of
injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR
Corporation is adequately protected under the circumstances.
Copyright 2002 EXAR Corporation
Datasheet October 2002.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
REVISIONS
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