參數(shù)資料
型號(hào)： SP3224ECA-L
廠(chǎng)商： Exar Corporation
文件頁(yè)數(shù)： 3/23頁(yè)
文件大小： 0K
描述： IC TXRX RS232 ESD 20SSOP
標(biāo)準(zhǔn)包裝： 66
類(lèi)型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 2/2
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 20-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 20-SSOP
包裝： 管件
其它名稱(chēng)： 1016-1090
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP3224ECA-L/TR 功能描述:RS-232接口集成電路 HIGH SPD INTELLIGENT +3V-+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:
SP3224ECY-L 功能描述:RS-232接口集成電路 HIGH SPD INTELLIGENT +3V-+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:
SP3224ECY-L/TR 功能描述:RS-232接口集成電路 HIGH SPD INTELLIGENT +3V-+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:
SP3224EEA-L 功能描述:RS-232接口集成電路 HIGH SPD INTELLIGENT +3V-+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:
SP3224EEA-L/TR 功能描述:RS-232接口集成電路 HIGH SPD INTELLIGENT +3V-+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:
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