参数资料
| 型号： | SP3203EEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD 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： | 3/2 |
| 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) |
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-707 www.exar.com
SP3203E_00_2080
DESCRIPTION
The
SP3203Eisa3-driver/2-receiverdevice
ideal for portable or handheld applications.
The
SP3203E transceivers meet the EIA/
TIA-232andITU-TV.28/V.24communication
protocolsandcanbeimplementedinbattery-
powered, portable, or handheld applications
such as notebook or palmtop computers,
PDA'sandcellphones. The
SP3203Edevice
features
Exar's proprietary and patented
(U.S.-- 5,306,954) on-board charge pump
circuitry that generates ±5.5V RS-232 volt-
age levels from a single +3.0V to +5.5V
power supply. The
SP3203E can operate at
a minimum data rate of 250kbps.
THEORY OF OPERATION
The
SP3203E is made up of four basic
circuit blocks:
. Drivers, 2. Receivers, 3. The Exar propri-
etary charge pump, and 4. V
L 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 degradation
in reliability. These drivers comply with the
EIA-TIA-232F and all previous RS-232 ver-
sions. The driver output stages are turned
off (High Impedance) when the device is in
shutdown mode.
The drivers can guarantee output data rates
fully loaded with 3k in parallel with 1000pF,
ensuring compatibility with PC-to-PC com-
munication software.
The slew rate of the driver output is internally
limited to a maximum of 30V/s in order
to meet the EIA standards (EIA RS-232D
2..7, Paragraph 5). The transition of the
loaded output from HIGH to LOW also
meets the monotonicity requirements of
the standard.
Figure 2 shows a loopback test circuit used
to test the RS-232 Drivers. Figure 3 shows
the test results with all drivers active at
20kbpswithtypicalRS-232loadsinparallel
with a 000pF capacitors. Figure 4 shows
the test results where one driver was active
at 250kbps and all three drivers loaded with
an RS-232 receiver in parallel with a 000pF
capacitor.The transmitter inputs do not have
pull-up resistors. Connect unused inputs to
ground or V
L.
Receivers
The receivers convert ±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
Receivers are disabled when in shutdown.
The truth table logic of the SP3203E driver
and receiver outputs can be found in Table
.
Since receiver input is usually from a trans-
mission line where long cable lengths and
system interference can degrade the signal,
the inputs have a typical hysteresis margin
of 500mV. This ensures that the receiver
is virtually immune to noisy transmission
lines. Should an input be left unconnected,
an internal 5k pull-down resistor to ground
will commit the output of the receiver to a
HIGH state.
Charge Pump
The charge pump is a patented design (U.S.
5,306,954) and uses a unique approach
compared to older less–efficient designs.
The charge pump still requires four external
capacitors, but uses a four–phase voltage
shifting technique to attain symmetrical
5.5V power supplies. The internal power
supply consists of a regulated dual charge
pump that provides output voltages of
+/-5.5V regardless of input voltage (V
CC)
over the +3.0V to +5.5V range. This
is important to maintain compliant RS-
232 levels regardless of power supply
fluctuations.
相关PDF资料 |
PDF描述 |
|---|---|
| SP320ACM-L | IC TXRX RS232 V.35 80LQFP |
| SP3222EET-L/TR | IC TXRX RS232 ESD TRUE 18WSOIC |
| SP3223EUEY-L | IC TXRX RS232 INTELLIGNT 20TSSOP |
| SP3232EBEP-L | IC TXRX RS232 ESD TRUE 16DIP |
| SP3232EHET-L/TR | IC TXRX RS232 ESD 16WSOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3203EY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3V RS-232 Serial Transceiver with Logic Selector |
| SP-320-48 | 功能描述:线性和开关式电源 321.6W 48V 6.7A W/PFC Function RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度: |
| SP-3205 | 功能描述:SPEAKER (WITH FRAME) 99DB SENSIT 制造商:soberton inc. 系列:* 零件状态:在售 标准包装:200 |
| SP-320-5 | 功能描述:线性和开关式电源 275W 5V 55A W/PFC Function RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度: |
| SP3-20-50 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:SP3 Series Mini-SIP Passive Delay Modules |
发布紧急采购，3分钟左右您将得到回复。