參數(shù)資料
型號： SP3227ECY-L
廠商： Exar Corporation
文件頁數(shù)： 6/23頁
文件大?。?/td> 0K
描述： IC TXRX RS232 ESD SD 16TSSOP
標準包裝： 95
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 1/1
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 16-TSSOP
包裝： 管件
4
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3224E,3225E,3226E,3227E_0_087
thatsavespowerbyturningoffthecharge
pumpsanddriveroutputswhenthetrans-
ceiverinputsareidleformorethan30sec-
onds.Auto On-line Plus is equivalent to
Maxim’s“AutoShutdownPlus”feature.It
differs from our existingAuto On-line by
relying on signal transitions rather than
voltage levels to trigger shutdown and
wakeup.
AutoOn-LinePlusautomaticallyputsthe
deviceintoastandbymodewhereitdraws
only1μAtypical.Whenthedevicedetects
activityoneitherthereceiverordriverin-
putsitwillautomaticallyawakeandactivate
to allow serial communication. Both the
wakeup and shutdown happen automati-
cally,withoutanyuserintervention,special
drivers,orsoftwaremodifications.
Wakeup and shutdown can be exter-
nally controlled by the ONLINE and
SHUTDOWNpins.WhenONLINEisdriv-
en to logic LOW, the Auto On-line Plus
functionisactive.DrivingSHUTDOWN to
+0.3V
R_IN
-0.3V
30s
timer
STATUS
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE
BETWEEN +0.3V AND -0.3V FOR AT LEAST 30S
T_IN
R_IN EDGE
DETECT
EDGE
DETECT
SHUTDOWN
S
A
ONLINE
30s
timer
Figure 3a.STATUS Functional Diagram STATUS low
Figure 3c. Auto On-line¨ Plus Logic
+2.7V
R_IN
-2.7V
30s
timer
STATUS
INVALID DEASSERTED IF ALL RECEIVER INPUTS ARE
BETWEEN +2.7V AND -2.7V FOR AT LEAST 30S
Figure 3b. STATUS Functional Diagram, STATUS high.
SHUTDOWN
ONLINE
AUTO ONLINE
POWERDOWN
POWERDOWN IS ONLY A INTERNAL SIGNAL. IT
CONTROLS THE OPERATIONAL STATUS TO THE
TRANSMITTERS AND THE POWER SUPPLIES.
Figure 3d. Powerdown Logic
AUTO ONLINE
logicLOWforcesthedeviceintoshutdown
stateregardlessofinputactivityorthesta-
tusoftheONLINE pin.
TheSTATUSoutputdetermineswhethera
validRS-232signalvoltageispresenton
theinputs.TheSTATUSpingoestoalogic
LOWwhenthereceiverinputsignallevels
collapsenearreferenceground.Thismay
occur when the RS-232 cable is discon-
nected or the RS-232 drivers of the con-
nectedperipheralareturnedoff.
STATUSmaybeusedtoindicateDTRora
RingIndicatorsignalortodeterminewheth-
eraliveRS232driverorcableisconnect-
ed. By connecting the STATUS output to
ONLINEinput,theSP3224E-SP3227Ewill
shutdownwhennovalidsignalleveland
noinputtransitionsaredetected,andwake
uponavalidsignallevelorsignaledge.Ifit
detectsnosignaltransitionswiththepast30
seconds,thedevicewillgointolowpower
mode.ByconnectingtheSTATUSoutputto
boththeONLINEinputandSHUTDOWN
inputpins,thedeviceentersintoshutdown
whennotreceivingavalidRS-232signalvoltage
input.
WhentheSP3224E-SP3227Edevicesare
THEORy OF OPERATION
Receiver
5k
Ω
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參數(shù)描述
SP3227ECY-L/TR 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP3227EEA-L 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP3227EEA-L/TR 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP3227EEY-L 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP3227EEY-L/TR 功能描述:RS-232接口集成電路 1MBPS+3-+5.5V RS-232 AUTO ONLINE PLUS 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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