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參數(shù)資料
| 型號： | SP3238EE |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 248K |
| 代理商： | SP3238EE |
Date: 02/24/05
SP3238EE Intelligent +3.0V to +5.5V RS-232 Transceiver
Copyright 2005 Sipex Corporation
8
DESCRIPTION
The SP3238EE
device
meets 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 SP3238E
device features 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 SP3238E device can guarantee a
data rate of 250kbps fully loaded.
The SP3238EE is a 5-driver/3-receiver device,
ideal for portable or hand-held applications.
The SP3238EE 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 SP3238EE device is an ideal choice for
power sensitive designs. The SP3238EE
device
features
AUTO ON-LINE
circuitry which re-
duces the power supply drain to a 1
μ
A supply
current. In many portable or hand-held applica-
tions, 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 SP3238EE device is made up of four basic
circuit blocks: 1. Drivers, 2. Receivers,
3. the Sipex proprietary charge pump, and
4.
AUTO ON-LINE
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 can guarantee a data rate of 250kbps
fully loaded with 3k
in parallel with 1000pF,
ensuring compatibility with PC-to-PC commu-
nication software. All unused driver inputs must
be connected to V
CC
or
GND.
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 6. Interface Circuitry Controlled by
Microprocessor Supervisory Circuit
SP3238EE
28
25
3
1
27
4
26
GND
C1+
C1-
C2+
C2-
V+
V-
V
CC
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
13
14
15
V
CC
2
ONLINE
SHUTDOWN
STATUS
μ
P
Supervisor
IC
V
CC
VIN
RESET
5k
5k
5k
24
23
22
16
21
20
18
5
6
7
8
9
11
RS-232
OUTPUTS
RS-232
INPUTS
T
1
IN
R
1
OUT
R
1
IN
T
2
OUT
R
1
OUT
T
2
IN
T
3
IN
T
3
OUT
T
1
OUT
R
2
IN
R
3
IN
R
2
OUT
R
3
OUT
UART
or
Serial
μ
C
TxD
RTS
DTR
RxD
CTS
DSR
DCD
RI
19
17
10
12
T
4
OUT
T
4
IN
T
5
IN
T
5
OUT
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| SP3238EEEA | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
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| SP3238EECA | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP3238EEA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3238EEA/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3238EEA-L | 功能描述:RS-232接口集成電路 RS232 250 kbps temp -40C to 85C 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3238EEA-L/TR | 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3238EECA | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver |
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