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参数资料
| 型号： | SP3223EUEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 20/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 INTELLIGNT 20TSSOP |
| 产品变化通告： | Packaging Change 15/Jul/2010 |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
9
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-707 www.exar.com
SP3223E/EB/EU_0_06272
DESCRIPTION
The
SP3223 is a 2-driver/2-receiver device
ideal for portable or handheld applications.
The
SP3223 transceiversmeettheEIA/TIA-
232 and ITU-T V.28/V.24 communication
protocolsandcanbeimplementedinbattery-
powered, portable, or handheld applications
such as notebook or handheld computers.
The
SP3223 devices feature Exar's propri-
etary on-board charge pump circuitry that
generates ±5.5V RS-232 voltage levels from
a single +3.0V to +5.5V power supply.
These devices are an ideal choice for power
sensitivedesigns.FeaturingAUTOON-LINE
circuitry,the
SP3223reducesthepowersup-
ply drain to a A supply current. In many
portableorhandheldapplications,anRS-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
powersavingconcernswithoutmajordesign
changes.
THEORY OF OPERATION
The
SP3223 series is made up of four basic
circuit blocks:
. Drivers, 2. Receivers, 3. The Exar pro-
prietary charge pump, and 4. AUTO ON-
LINE circuitry.
Drivers
The drivers are inverting level transmitters
thatconvertTTLorCMOSlogiclevelsto5.0V
EIA/TIA-232 levels with an inverted sense
relativetotheinputlogiclevels. 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 degrada-
tion in reliability. These drivers comply with
the EIA-TIA-232F and all previous RS-232
versions. Unused driver inputs should be
connected to GND or V
CC.
The drivers can guarantee output data
rates fully loaded with 3k in parallel with
000pF, (SP3223EU, C
L= 250pF) ensuring
compatibility with PC-to-PC communication
software.
The slew rate of the driver output on the
E and EB versions is internally limited to a
maximum of 30V/s in order to meet the EIA
standards(EIARS-232D2..7,Paragraph5).
The Slew Rate of EU version is not limited
to enable higher speed data transfers. The
transition of the loaded output from HIGH to
LOW also meets the monotonicity require-
ments of the standard.
Figure 4 shows a loopback test circuit used
to test the RS-232 Drivers. Figure 15 shows
the test results where one driver was active
at 250kbps and all drivers are loaded with
an RS-232 receiver in parallel with a 000pF
capacitor. RS-232 data transmission rate of
20kbpsto Mbps providecompatibilitywith
designs in personal computer peripherals
and LAN applications.
Figure 3. Interface Circuitry Controlled by Micropro-
cessor Supervisory Circuit
SP3223E
2
4
6
5
3
7
19
5K
GND
C1+
C1-
C2+
C2-
V+
V-
VCC
11
12
15
10
0.1F
+
C2
C5
C1
+
C3
C4
+
17
8
16
9
RS-232
OUTPUTS
RS-232
INPUTS
14
20
11
VCC
18
R
1OUT
R
1IN
T
1OUT
T
1IN
T
2IN
R
2IN
R
2OUT
ONLINE
SHUTDOWN
STATUS
UART
or
Serial C
P
Supervisor
IC
TTL/CMOS INPUTS
VCC
V
IN
RESET
0.1F
T
2OUT
EN
TTL/CMOS OUTPUTS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3223EY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223H | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
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