參數(shù)資料
型號(hào)： SP235A
英文描述： 5V Multi-Channel RS-232 Drivers/Receivers(5V,多通道RS-232線驅(qū)動(dòng)器/接收器(5發(fā)5收）)
中文描述： 5V的多通道RS - 232驅(qū)動(dòng)器/接收器（5V的，多通道的RS - 232線驅(qū)動(dòng)器/接收器（5發(fā)5收））
文件頁(yè)數(shù)： 6/17頁(yè)
文件大?。?/td> 661K
代理商： SP235A
SP30A/234A/235A/236A/237A/238A/239A/
SP241A/235B/236B/240A/240B/241A/241B
+5V Powered Multi-Channel RS-232 Drivers/Receivers
6
Copyright 2000 Sipex Corporation
FEATURES…
The multi–channel RS-232 line drivers/receivers pro-
vides a variety of configurations to fit most communi-
cation needs, especially those applications where
±
12V is not available. The
SP230A
,
SP235A/B
,
SP236A/B, SP240A/B
, and
SP241A/B
feature a
shutdown mode which reduces device power dissipa-
tion to less than 5
μ
W. All feature low power CMOS
operation, which is particularly beneficial in battery-
powered systems. The
SP235A/B
use no external
components and are ideally suited where printed
circuit board space is limited.
All products in the Series, except the
SP239A
, include
two charge pump voltage converters which allow
them to operate from a single +5V supply. These
converters convert the +5V input power to the
±
10V needed to generate the RS-232 output levels.
The
SP239A
is designed to operate from +5V and
+12V supplies. An internal charge pump converter
produces the necessary –12V supply. All drivers
and receivers meet all EIA RS-232D and CCITT
V.28 specifications.
The Series are available for use over the commer-
cial, industrial and military temperature ranges.
They are packaged in plastic and ceramic DIP, and
SOIC packages. For product processed and
screened to MIL–M–38510 and MIL–STD–883C
requirements, please consult the factory.
THEORY OF OPERATION
The
SP230A/B–241A/B
series devices are made up
of three basic circuit blocks – 1) transmitter, 2) receiver
and 3) charge pump. Each model within the series
incorporates variations of these circuits to achieve the
desired configuration and performance.
Driver/Transmitter
The drivers are inverting transmitters, which accept
TTL or CMOS inputs and output the RS-232 signals
with an inverted sense relative to the input logic levels.
Typically the RS-232 output voltage swing is
±
9V.
Even under worst-case loading conditions of 3k
and
2500pF, the output is guaranteed to be
±
5V, which is
consistent with the RS-232 standard specifications.
The transmitter outputs are protected against infi-
nite short-circuits to ground without degradation
in reliability.
The drivers of the
SP230A, SP235A/B, SP236A/B,
SP240A/B
and
SP241A/B
can be tri-stated by using
the SHUTDOWN function. In this “power-off” state,
the output impedance will remain greater than 300
Ohms, again satisfying the RS-232 specifications.
Should the input of the driver be left open, an internal
400k
pull–up resistor to V
forces the input high,
thus committing the output to a low state.
The slew rate of the transmitter output is internally
limited to a maximum of 30V/
μ
s in order to meet the
Table 1. EIA Standards Definition
20kbps
100kbps
10Mbps
10Mbps
64kbps
相關(guān)PDF資料
PDF描述
SP235B 5V Multi-Channel RS-232 Drivers/Receivers(5V,多通道RS-232線驅(qū)動(dòng)器/接收器(5發(fā)5收）)
SP236A 5V Multi-Channel RS-232 Drivers/Receivers(5V,多通道RS-232線驅(qū)動(dòng)器/接收器(4發(fā)3收）)
SP236B 5V Multi-Channel RS-232 Drivers/Receivers(5V,多通道RS-232線驅(qū)動(dòng)器/接收器(4發(fā)3收）)
SP237A 5V Multi-Channel RS-232 Drivers/Receivers(5V,多通道RS-232線驅(qū)動(dòng)器/接收器(5發(fā)3收）)
SP231A 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP235ACP 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers
SP235AEP 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers
SP235B 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers
SP235BCP 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers
SP235BCP-L 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
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