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參數(shù)資料
| 型號： | SP3282EBEY |
| 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)： | 6/15頁 |
| 文件大小： | 307K |
| 代理商： | SP3282EBEY |
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
Copyright 2005 Sipex Corporation
6
DESCRIPTION
The SP3282EB
device
meets the EIA/TIA-232
and ITU-T V.28/V.24 communication protocols
and can be implemented in battery-powered, por-
table, or hand-held applications such as notebook
or palmtop computers. The SP3282EB 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 +3.3V to +5.5V power supply. The
SP3282EB will adhere to EIA/TIA-562 voltage
levels with V
CC
as low as 2.35V.
The SP3282EB device is an ideal choice for power
sensitive designs. The SP3282EB
device features
AUTO ON-LINE
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 condi-
tions, the internal charge pump and the drivers will
be shut down. Otherwise, the system automati-
cally comes online. This feature allows design
engineers to address power saving concerns with-
out major design changes.
THEORY OF OPERATION
The SP3282EB 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 ,
when V
is between +3.3V and +5.5V, 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 driver outputs will adhere to EIA/
TIA-562 when V
CC
is as low as 2.35V.
The SP3282EB drivers can guarantee a data rate of
250 kbps fully loaded with 3k
in parallel with
1000pF, ensuring compatibility with PC-to-PC
communication software. All unused driver inputs
must be connected to V
L
or GND.
Figure 6
shows a loopback test circuit used to test
the SP3282EB RS-232 drivers. Figure 7
shows the
test results of the loopback circuit with all five
drivers active at 120kbps with typical RS-232
loads in parallel with 1000pF capacitors. Figure 8
shows the test results where one driver was active
at 250kbps and all five drivers loaded with an RS-
232 receiver in parallel with a 1000pF capacitor. A
solid RS-232 data transmission rate of 120kbps
provides compatibility with many designs in per-
sonal computer peripherals and LAN applications.
Receivers
The receivers convert
±
5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
Receivers are not active when in shutdown. If
there is no activity present at the receivers for a
period longer than 100
μ
s during AUTO ON-
LINE
mode or when SHUTDOWN is enabled,
the device goes into a standby mode where the
circuit draws 1
μ
A. The truth table logic of the
driver and receiver outputs can be found in
Table 3.
Figure 5. Interface Circuitry Being Controlled by
Microprocessor Supervisory Circuit
SP3282EB
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
SuμP
IC
V
CC
VIN
RESET
5k
5k
5k
24
23
22
21
20
18
5
6
7
8
9
11
RS-232
RS-232
T
1
IN
R
1
OUT
R
1
IN
T
2
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 μC
TxD
RTS
DTR
RxD
CTS
DSR
DCD
RI
19
17
10
12
T
4
OUT
T
4
IN
T
5
IN
T
5
OUT
16
V
L
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP3282EBEY/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +2.35V to +5.5V RS-232 Transceivers |
| SP3282EBEY-L | 制造商:Exar Corporation 功能描述:TRANSCEIVER RS-232 +1.8V TO +5.5V |
| SP32R0FL | 制造商:TE Connectivity 功能描述:SP3 2R0 1% LOOSEFixed Resistor |
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| SP-33 | 功能描述:TRANS 1K/50 OHM IMPEDANCE AUDIO RoHS:是 類別:變壓器 >> 音頻 系列:- 標準包裝:1 系列:TTC 變壓器類型:數(shù)據(jù)/音頻耦合 電流:- 阻抗:600 主，490CT 副 插入損耗:1.5dB 安裝類型:表面貼裝 尺寸/尺寸:13.50mm L x 14.00mm W 高度 - 座高（最大）:10.40mm 端接類型:鷗翼型 其它名稱:MT7210CT |
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