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參數(shù)資料
| 型號： | SP3243E |
| 英文描述： | Intelligent +3.0V to +5.5V RS-232 Transceivers(智能+3.0V 至 +5.5V RS-232收發(fā)器（3發(fā)5收）) |
| 中文描述： | 智能3.0V至5.5V的RS - 232收發(fā)器（智能3.0V至5.5V的RS - 232接口收發(fā)器（3發(fā)5收）） |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 235K |
| 代理商： | SP3243E |
SP3223EDS/20
SP3223E +3.0V to +5.5V RS-232 Transceivers
10
Copyright 2000 Sipex Corporation
DESCRIPTION
The
SP3223E
and
SP3243E
transceivers meet
the EIA/TIA-232 and ITU-T V.28/V.24 commu-
nication protocols and can be implemented in
battery-powered, portable, or hand-held appli-
cations such as notebook or palmtop computers.
The
SP3223E
and
SP3243E
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
SP3223E
and
SP3243E
devices can operate at
a typical data rate of 235kbps fully loaded.
The
SP3223E
is a 2-driver/2-receiver device,
and the
SP3243E
is a 3-driver/5-receiver device
ideal for portable or hand-held applications.
The
SP3243E
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
SP3223E
and
SP3243E
series is an ideal
choice for power sensitive designs. The
SP3223E
and
SP3243E
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 peripheral 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
SP3223E
and
SP3243E
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-232F and all
previous RS-232 versions.
The drivers typically can operate at a data rate
of 235Kbps. The drivers can guarantee a data
rate of 120Kbps 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
SP3243E
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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| SP3483CN | +3.3V Low Power Slew Rate Limited Half-Duplex RS-485 Transceiver |
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| SP3483EN | +3.3V Low Power Slew Rate Limited Half-Duplex RS-485 Transceiver |
| SP3483EP | +3.3V Low Power Slew Rate Limited Half-Duplex RS-485 Transceiver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP3243EA | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EBCA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3243EBCA/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EBCA-L | 功能描述:RS-232接口集成電路 RS232 250 kbps 3Tx temp 0C to 70C RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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