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| 型号： | SP3225EEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 3/23页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD SD 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) |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3224E,3225E,3226E,3227E_0_087
THEORy OF OPERATION
Description
TheSP3224EandSP3225Eare2-driver/
2-receiver devices. The SP3226E and
SP3227E are 1-driver/1-receiver devices.
Allareidealforserialportsinembedded,
consumer, portable, or handheld applica-
tions.ThetransceiversmeettheEIA/TIA-
232 and ITU-T V.28/V.24 communication
protocolsforreliableserialcommunication.
ThedevicesfeatureExar’sproprietaryand
patented(U.S.5,306,954)on-boardcharge
pump circuitry that generates ±5.5V RS-
232voltagelevelsfromasingle+3.0Vto
+5.5Vpowersupply.
The SP3224E-SP3227E are ideal choic-
es for power sensitive designs. With the
AutoOn-linePlusenabled,theSP3224E-
SP3227E reduce supply current to 1A
wheneverthetransceiversareinidle.In
shutdown, the internal charge pump and
thedriverswillshutdown.Thisfeatureal-
lowsdesignengineerstoaddresspower
saving concerns without major design
changes.
Theory Of Operation
The SP3224E-SP3227E are made up of
fourbasiccircuitblocks:1.Drivers,2.Re-
ceivers, 3. the Exar proprietary charge
pump,and4.AutoOn-linePluscircuitry.
Drivers
The drivers are inverting level transmit-
tersthatconvertTTLorCMOSlogiclev-
els to 5.0V EIA/TIA-232 levels with an
inverted sense relative to the input logic
levels.Typically, the RS-232 output volt-
ageswingis+5.4Vwithnoloadand+5V
minimumfullyloaded.Thedriveroutputs
areprotectedagainstinfiniteshort-circuits
togroundwithoutdegradationinreliabili-
ty.ThesedriverscomplywiththeEIA-TIA-
232-FandallpreviousRS-232versions.
Unuseddriverinputsshouldbeconnected
toGNDorVCC.
The drivers can guarantee output data
ratesfullyloadedwith3KΩinparallelwith
1000pF (SP3224E/SP3226E), or 3KΩ in
parallel with 250pF (SP3225E/SP3227E)
ensuringcompatibilitywithPC-to-PCcom-
municationsoftware.Theslewrateofthe
driveroutputontheSP3224E/SP3226Eis
internallylimitedtoamaximumof30V/μs
in order to meet the EIA standards (EIA
RS-232D 2.1.7, Paragraph 5). The Slew
RateofSP3225E/SP3227Eisnotlimited
toenablehigherspeeddatatransfers.The
transitionoftheloadedoutputfromHIGH
toLOWalsomeetsthemonotonicsignal
transitionrequirementsofthestandard.
Receivers
The receivers convert EIA/TIA-232 signal
levels to TTL or CMOS logic output lev-
els.Receiversremainactiveduringdevice
shutdown. Since receiver input is usually
fromatransmissionlinewherelongcable
lengths and system interference can de-
gradethesignal,theinputshaveatypical
hysteresismarginof500mV.Thisensures
thatthereceiverisvirtuallyimmunetonoisy
transmissionlines.Shouldaninputbeleft
unconnected,aninternal5KΩpulldownre-
sistortogroundwillcommittheoutputof
thereceivertoaHIGHstate.
Charge Pump
ThechargepumpisaExar–patentedde-
sign (US Patent #5,306,954) and uses a
uniqueapproachcomparedtoolderless-
efficient designs. The charge pump still
requiresfourexternalcapacitors,butuses
afourphasevoltageshiftingtechniqueto
attain symmetrical 5.5V power supplies.
The internal power supply consists of a
regulateddualchargepumpthatprovides
outputvoltages5.5Vregardlessofthein-
putvoltage(Vcc)overthe+3.0Vto+5.5V
range.Thisisimportanttomaintaincom-
pliant RS-232 levels regardless of power
supplyfluctuations.
Thechargepumpoperatesinadiscontinu-
ousmodeusinganinternaloscillator.Ifthe
outputvoltagesarelessthanamagnitude
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3226ECA-L | 功能描述:RS-232接口集成电路 INTELLIGNET +3V-5.5V RS232 W/AUTO ON-LINE RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP3226ECA-L/TR | 功能描述:RS-232接口集成电路 INTELLIGENT +3-+5.5V RS-232 AUTO ONLINE RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP3226ECY-L | 功能描述:RS-232接口集成电路 INTELLIGENT +3-+5.5V RS-232 AUTO ONLINE RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP3226ECY-L/TR | 功能描述:RS-232接口集成电路 INTELLIGENT +3-+5.5V RS-232 AUTO ONLINE RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP3226EEA-L | 功能描述:RS-232接口集成电路 INTELLIGNET +3V-5.5V RS232 W/AUTO ON-LINE RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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