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PDF CX28332 Data sheet ( Hoja de datos )
| Número de pieza | CX28332 | |
| Descripción | (CX28331 - CX28333) Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit | |
| Fabricantes | Conexant Systems | |
| Logotipo |  |
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Advance Information
This document contains information on a product under development. The parametric information
contains target parameters that are subject to change.
CX28331/CX28332/CX28333
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
The CX28333 is a three-channel, E3/DS3/STS-1 fully-integrated Line Interface Unit
(LIU). It is configured via external pins and does not need a microprocessor interface.
Each channel has an independent equalizer on the receive side requiring no user
configuration. Also, each channel has a programmable transmit pulse shaper that can
be set to ensure that the cross-connect pulse mask requirement is met for transmit
cable length up to 450 feet. The CX28332 is a dual-channel, and the CX28331 is a
single-channel LIU with performance identical to the CX28333.
The CX28333 gives the user new economies of scale in concentrator applications
where three DS3 or STS-1 channels are concentrated into a single STS-3 channel. By
including three independent transceivers on a chip, significant external components are
eliminated, with the exception of 1:1 coupling transformers, termination resistors, and
supply bypass capacitors.
NOTE: In this document, "i" is used to represent the number of channels:
i = 1 (CX28331), i = 2 (CX28332), and i = 3 (CX28333).
Functional Block Diagram
XOE
LBO
E3MODE
PDB
TPOS
TNEG
TCLK
TAIS
RLOOP
LLOOP
RPOS
RNEG
RCLK
RLOS
PDATA/
NDATA
ENCODER
TCLK
Pulse
Shaper
DATA
MUX
LINE
DRIVER
TX
Monitor
DECODER
PDATA
NDATA
Clock/
Data
DATCLK Recovery
P
N Receiver
ALOS
TLINEP
TLINEM/N
TMONP
TMONM
TXMON
TMONTST
REFCLK
RLINEP
RLINEM/N
REQH
LIU #1
LIU #2
LIU #3
Distinguishing Features
• Can be used as a data transceiver
over a maximum of 900 feet of Type
734/728 coaxial cable or equivalent
in an on-premise environment
• Programmable pulse filtering to meet
cross-connect pulse masks (ANSI
T1.102-1993)
• Meets jitter specifications of Bellcore
GR499, GR253, and TBR24 (with
external JAT).
• Large input dynamic range
• Alarms for coding violation and loss
of signal
• Full diagnostic loopback capability
• Uses a minimum of external
components
• Compatible with ITU-T G.703, G.823
• Independent power down mode per
channel
• Easily interfaced to the DS3/E3
Framer IC (CX28342/3/4/6/8 and
CN8330)
• Selectable B3ZS/HDB3
encoding/decoding
• Superior input receiver sensitivity
(< 25 mV)
• Transmit monitor inputs (CX2833i-3x
series only)
Physical Characteristics
• 80- and 100-pin ETQFP package
• Single 3.3 V power supply
• 1 W maximum power dissipation
(CX28333)
• –40 °C to +85 °C temperature range
• 5 V-tolerant pins
• TTL digital pins
Applications
• Digital Cross-Connect Systems
• Routers
• ATM Switches
• Channelized Line Aggregation Units
• Test Equipment
• Channel Service Units
• Multiplexers
NOTE(S): The TX Monitor is only used with the 100-pin CX2833i-3X.
Data Sheet
100985A
June 2, 2000
1 page  
Table of Contents
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
1.0 Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2.0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1 AMI B3ZS/HDB3 Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2 Pulse Shaper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.3 Line Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.3.1 Transmit Pulse Mask Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.2.4 Alarm Indication Signal (AIS) Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.2.5 Transmit Monitor Block (CX2833i-3x Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.2.6 Jitter Generation (Intrinsic). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.3 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.1 Receive Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.2 AGC/VGA Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.3 Receive Equalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.3.4 The PLL Clock Recovery Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3.5 Loss Of Signal (LOS) Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3.6 B3ZS/HDB3 Decoder With Bipolar Violation Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3.7 Data Squelching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.4 Jitter Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.4.1 Jitter Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.5 Additional CX28331/CX28332/CX28333 Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.5.1 Bias Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.5.2 Power-On Reset (POR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.5.3 Loopback Multiplexers (MUXes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.6 Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
2.7 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
100985A
Conexant
v
5 Page 
1
1.0 Pin Description
1.1 Pin Assignments
Figures 1-1 (CX28331-1x), 1-2 (CX28332-1x), and 1-3 (CX28333-1x) illustrate
pin assignments for the 80-pin Exposed Thin Quad Flat Package (ETQFP). See
Table 1-1 for the CX2833i-1x pin descriptions.
Figures 1-4 (CX28331-3x), 1-5 (CX28332-3x), and 1-6 (CX28333-3x)
illustrate pin assignments for the 100-pin ETQFP. The 100-pin package adds
more functionality, supporting new features such as Transmit Monitoring and
Transmit Monitoring Status testing. See Table 1-2 for the CX2833i-3x pin
descriptions.
The input/output (I/O) column is coded as follows:
I = Input
O = Output
I/O = Bidirectional
P = Power
NOTE: All digital inputs and outputs contain 75 kΩ pull-down resistors.
When a channel is disabled (i.e., the PDx pin is tied low or not connected), all
receive and transmit analog circuitry powers down. Analog inputs (RLINE) are
ignored and analog outputs (TLINE) are high impedance. Digital inputs of a
powered-down channel are still active, but ignored. Overall noise on the device
can be lowered by not driving the digital inputs of a powered-down channel.
NOTE: When power is disconnected from the device, TLINE pins are low
impedance to ground if driven by more than one forward-bias diode
voltage (0.7 V) below ground. Additionally, driving TLINE, a
forward-bias diode voltage above the VGG pin, creates a low impedance
path from the TLINE pin to the VGG pin. Otherwise, the TLINE pins are
high impedance.
100985A
Conexant
1-1
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CX28332.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CX28331 | (CX28332 / CX28333) Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit |  Conexant |
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| CX28333 | (CX28331 - CX28333) Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit | Conexant Systems |
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