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參數(shù)資料
| 型號： | SP3223EH |
| 英文描述： | High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers(高速，智能+3.0V 至 +5.5V RS-232收發(fā)器（2發(fā)2收）) |
| 中文描述： | 高速智能3.0V至5.5V的RS - 232收發(fā)器（高速，智能3.0V至5.5V的RS - 232接口收發(fā)器（2發(fā)2收）） |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 230K |
| 代理商： | SP3223EH |
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
10
Copyright 2000 Sipex Corporation
DESCRIPTION
The
SP3223EH
and
SP3243EH
transceivers
meet the EIA/TIA-232 and ITU-T V.28/V.24
communication protocols and can be
implemented in battery-powered, portable, or
hand-held applications such as notebook or
palmtop computers. The
SP3223EH
and
SP3243EH
devices feature
Sipex's
proprietary
and patented (U.S.-- 5,306,954) on-board charge
pump circuitry that generates +5.5V RS-232
voltage levels from a single +3.0V to +5.5V
power supply. The
SP3223EH
and
SP3243EH
devices can operate at a data rate of 460Kbps
fully loaded.
The
SP3223EH
is a 2-driver/2-receiver device,
and the
SP3243EH
is a 3-driver/5-receiver device,
ideal for portable or hand-held applications. The
SP3243EH
includes one complementary
always-active receiver that can monitor an
external device (such as a modem) in shutdown.
This aids in protecting the UART or serial
controller IC by preventing forward biasing
of the protection diodes where V
CC
may be
disconnected.
The
SP3223EH
and
SP3243EH
series is an
ideal choice for power sensitive designs. The
SP3223EH
and
SP3243EH
devices feature
Auto-Online
circuitry which reduces the power
supply drain to a 1
μ
A supply current. In many
portable or hand-held applications, an RS-232
cable can be disconnected or a connected periph-
eral can be turned off. Under these conditions,
the internal charge pump and the drivers will be
shut down. Otherwise, the system automatically
comes online. This feature allows design
engineers to address power saving concerns
without major design changes.
THEORY OF OPERATION
The
SP3223EH
and
SP3243EH
series is made
up of four basic circuit blocks: 1. Drivers,
2. Receivers, 3. the Sipex proprietary charge
pump, and 4.
Auto-Online
circuitry.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to 5.0V EIA/
TIA-232 levels with an inverted sense relative to
the input logic levels. Typically, the RS-232
output voltage swing is +5.4V with no load and
+5V minimum fully loaded. The driver outputs
are protected against infinite short-circuits to
ground without degradation in reliability. These
drivers comply with the EIA-TIA-232-F and all
previous RS-232 versions.
The drivers can guarantee a data rate over
460Kbps fully loaded with 3K
in parallel with
1000pF, ensuring compatibility with PC-to-PC
communication software.
The slew rate of the driver output is internally
limited to a maximum of 30V/
μ
s in order to
meet the EIA standards (EIA RS-232D 2.1.7,
Paragraph 5). The transition of the loaded
output from HIGH to LOW also meets the
monotonicity requirements of the standard.
Figure 11. Interface Circuitry Controlled by Micropro-
cessor Supervisory Circuit
SP3243EH
28
24
2
1
27
3
26
5K
5K
5K
5K
5K
GND
C1+
C1-
C2+
C2-
T
1
IN
V+
V-
V
CC
14
13
12
20
19
18
17
16
15
0.1
μ
F
0.1
μ
F
0.1
μ
F
+
C2
C5
C1
+
+
C3
C4
+
+
0.1
μ
F
0.1
μ
F
9
10
11
4
5
6
7
8
RS-232
RS-232
23
22
21
V
CC
25
R
1
OUT
R
1
IN
T
2
OUT
R
2
OUT
T
2
IN
T
3
IN
T
3
OUT
T
1
OUT
R
2
IN
R
3
IN
R
4
IN
R
5
IN
R
2
OUT
R
3
OUT
R
4
OUT
R
5
OUT
ONLINE
SHUTDOWN
STATUS
UART
or
Serial
μ
C
SupeP
IC
TxD
RTS
DTR
RxD
CTS
DSR
DCD
RI
V
CC
VIN
RESET
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP3223EHCA | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223EHCA-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3223EHCP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223EHCY | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223EHCY-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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