參數(shù)資料
型號(hào)： SP508
英文描述： Rugged 40Mbps, 8 Channel Multiprotocol Transceiver with Programmable DCE/DTE and Termination Resistors(40Mbps差分傳輸速率，8通道多協(xié)議收發(fā)器（帶可編程DCE/DTE和終端電阻器）)
中文描述： 堅(jiān)固40Mbps的，8通道多協(xié)議收發(fā)器，具有可編程DCE的/ DTE和終端電阻（40Mbps的差分傳輸速率，8通道多協(xié)議收發(fā)器（帶可編程DCE的/ DTE的和終端電阻器））
文件頁(yè)數(shù)： 20/27頁(yè)
文件大?。?/td> 246K
代理商： SP508
20
rev. 8/31/00
SP508 Enhanced WAN Multi–Mode Serial Transceiver
Copyright 2000 Sipex Corporation
P
FEATURES
The
SP508
contains highly integrated serial
transceivers that offer programmability between
interface modes through software control. The
SP508
offers the hardware interface modes for
RS-232 (V.28), RS-449/V.36 (V.11 and V.10),
EIA-530 (V.11 and V.10), EIA-530A (V.11 and
V.10), V.35 (V.35 and V.28) and X.21(V.11). The
interface mode selection is done via three control
pins, which can be latched via microprocessor
control.
The
SP508
has eight drivers, eight receivers, and
Sipex's
patented on-board charge pump
(5,306,954) that is ideally suited for wide area
network connectivity and other multi-protocol
applications. Other features include digital and
line loopback modes, individual enable/disable
control lines for each driver and receiver, fail-safe
when inputs are either open or shorted, individual
termination resistor ground paths, separate driver
and receiver ground outputs, enhanced ESD
protection on driver outputs and receiver inputs.
THEORY OF OPERATION
The
SP508
device is made up of 1) the drivers, 2)
the receivers, 3) a charge pump, 4) DTE/DCE
switching algorithm, and 5) control logic.
Drivers
The
SP508
has eight enhanced independent drivers.
Control for the mode selection is done via a three-
bit control word into D0, D1, and D2. The drivers
are prearranged such that for each mode of
operation, the relative position and functionality
of the drivers are set up to accommodate the
selected interface mode. As the mode of the drivers
is changed, the electrical characteristics will change
to support the required signal levels. The mode of
each driver in the different interface modes that
can be selected is shown in
Table 1
.
There are four basic types of driver circuits –
ITU-T-V.28 (RS-232), ITU-T-V.10 (RS-423),
ITU-T-V.11 (RS-422), and CCITT-V.35.
The V.28 (RS-232) drivers output single-ended
signals with a minimum of +5V (with 3k
&
2500pF loading), and can operate over 120kbps.
Since the
SP550
uses a charge pump to generate
the RS-232 output rails, the driver outputs will
never exceed +10V. The V.28 driver architecture
is similar to
Sipex's
standard line of RS-232
transceivers.
The RS-423 (V.10) drivers are also single-ended
signals which produce open circuit V
and V
measurements of +4.0V to +6.0V. When terminated
with a 450
load to ground, the driver output will
not deviate more than 10% of the open circuit
value. This is in compliance of the ITU V.10
specification. The V.10 (RS-423) drivers are used
in RS-449/V.36, EIA-530, and EIA-530A modes
as Category II signals from each of their
corresponding specifications. The V.10 driver can
transmit over 1Mbps if necessary.
The third type of drivers are V.11 (RS-422)
differential drivers. Due to the nature of differential
signaling, the drivers are more immune to noise as
opposed to single-ended transmission methods.
The advantage is evident over high speeds and
long transmission lines. The strength of the driver
outputs can produce differential signals that can
maintain +2V differential output levels with a load
of 100
. The signal levels and drive capability of
these drivers allow the drivers to also support
RS-485 requirements of +1.5V differential output
levels with a 54
load. The strength allows the
SP508
differential driver to drive over long cable
lengths with minimal signal degradation. The V.11
drivers are used in RS-449, EIA-530, EIA-530A
and V.36 modes as Category I signals which are
used for clock and data.
Sipex's
new driver design
over its predecessors allow the
SP508
to operate
over 40Mbps for differential transmission.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP508/1.2/BLACK 制造商:Farnell / Pro-Power 功能描述:HEATSHRINK 50.8MM BLACK 1.2M 制造商:pro-power 功能描述:HEATSHRINK, 50.8MM, BLACK, 1.2M 制造商:pro-power 功能描述:HEAT SHRINK TUBING, 50.8MM ID, PO, BLK, 3.94FT; I.D. Supplied - Metric:50.8mm; I.D. Supplied - Imperial:2"; I.D. Recovered Max - Metric:25.4mm; I.D. Recovered Max - Imperial:1"; Shrink Ratio:2:1; Shrink Tubing / Boot Color:Black ;RoHS Compliant: Yes
SP508/1.2/BLACK 制造商:Farnell / Pro-Power 功能描述:HEAT SHRINK 50.8MM BLACK 1.2M
SP508/1.2/BLUE 制造商:Farnell / Pro-Power 功能描述:HEAT SHRINK 50.8MM BLUE 1.2M
SP508/1.2/BLUE 制造商:Farnell / Pro-Power 功能描述:HEAT SHRINK 50.8MM BLUE 1.2M
SP508/1.2/CLEAR 制造商:Farnell / Pro-Power 功能描述:HEAT SHRINK 50.8MM CLEAR 1.2M
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