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3/24/2015 Simple3.3V5Vlevelshifter|IncredibleDIY
http://www.incrediblediy.com/2013/02/simple33v5vlevelshifter.html
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In present day electronicwe findmany sensors ormodulesworking in
3.3V logic levels.In other termsLVTTLdevices
(LowvoltageTTL).Butevennowwemostlyuse5VTTL logic
leveluCorotherdeviceswith them.Hence,weneedtochange logic
levelsbetween3.3V5Vwhen interfacingbothof themtogether. There are
many dedicated chips for this and there was none available in the
country. So Idecided to build some simple circuits to do this
conversion using transistors. Here,you can use anygeneral purpose
NPN transistors available in your country such as
2N39042SC828,BC547etc.
Youneedtosupply3.3V&5VasshownintheschematicsasVcc.ThiswontbeaproblemasyoumayalreadyhavethesetwopowerrailsinyourcircuitasyouusebothforchipsasVcc.Ihavetestedthisonmy3.3VBluetoothmoduleinterfacedwith5VPIC16F887.Itworkedwell.
[http://lh6.ggpht.com/L1TE_3QgX0/USjqZbrcOII/AAAAAAAAAKY/PrLbyWPCGNg/s1600h/to5%25255B4%25255D.jpg]
Simple3.3V5Vlevelshifter
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3/24/2015 Simple3.3V5Vlevelshifter|IncredibleDIY
http://www.incrediblediy.com/2013/02/simple33v5vlevelshifter.html
2/5
[http://lh3.ggpht.com/oassyeE_ypQ/USjqbnLAwzI/AAAAAAAAAKo/gtX7IkdiK8/s1600h/from5%25255B3%25255D.jpg]
Posted23rdFebruary2013byBuddika
Labels:I/O,LevelShift,LVTTL,Microcontroller,TTL
Replies
19 Viewcomments
Pradeepa February25,2013at12:27PMWhyR1infirstfigure?Reply
February25,2013at3:42PM
R1&R5canbeomitted,ijustbuilttwoNOTgateshereinunisontomakeabufferReply
Pradeepa March2,2013at8:57AMMakessense:)Reply
DeclanJordan March14,2013at4:11AMCan anyone explain to me how
the 3.35V level shifter circuit shown above actually works?
Pleaseexplainthecircuitandhowthevoltagesacrossthecollectorsandemitterschangeandwhy,thankyouReply
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3/24/2015 Simple3.3V5Vlevelshifter|IncredibleDIY
http://www.incrediblediy.com/2013/02/simple33v5vlevelshifter.html
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March14,2013at9:37AM
It'slikethis,Wheninputis0V,Q1isOFFandQ1'scollectorwillbe5V,thenQ2willbeON,andQ2'scollectorisat0V(asVceofQ2=0)When
input is3.3V,Q1
isONandQ1'scollectorwillbe0V(asVceofQ1=0),thenQ2willbeOFF,andQ2'scollectorisat5V,It'ssimpletwoNOTgatescombined:D
DeclanJordan
March17,2013at12:07AMHowwouldIconnectanOmronG2R1E5VRealytothatcircuit?
DeclanJordan March17,2013at3:12PMAnyone?????
March17,2013at8:14PM
I haven't used that particular relay,You can connect is using a
simple transistor relay
drivewithatransistor,resistorandadiode:DThislinkmayhelpyou(checkforrelaydrives)http://www.rentron.com/rf_remote_control.htm
DeclanJordan March14,2013at4:13AM
ReplyThiscommenthasbeenremovedbytheauthor.
JohnFaik
July1,2013at12:58AMCanthiscircuitusedbetweenarduinodue3.3vto5vcharacterlcd??Reply
July1,2013at2:17PM
Thisshouldwork,I'musing this to intefacemy3.3VBluetoothmodule
tomicrocontrollers.
Ihaveusedjustsomezenerdiodesformy3.3Vgraphiclcd,I'llwriteaboutitonnextpost
LucaTesta July15,2013at1:33PMWhen input goes low, Q1 should turn
off and its collector voltage should increase. I observe
thisbehavior,butwithanissue:ittakesalongtimeforQ1toturnoff(butitturnsonrapidly).Thislimitsitsuseto1MHz....anysolution?Whyisthat?Thanks.Reply
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3/24/2015 Simple3.3V5Vlevelshifter|IncredibleDIY
http://www.incrediblediy.com/2013/02/simple33v5vlevelshifter.html
4/5
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July17,2013at6:02PM
I didn't use this in such speeds,may be you need a faster
switching transistor
then,Thosedatawillbeonthetransistordatasheet:D
jimbuzz
August14,2013at7:35PMStickaresistorbetweenthebaseoftheinputtransistorQ3andground,thiswillspeeduptheturnoffofthis
transistor, that is what is limiting the switching speed. Use a 1K
resistor as this is what you areusingeverywhereelse.Reply
jimbuzz August14,2013at7:37PMSorryImeantQ1transistor.
August14,2013at7:39PM
Thanksfortheidea:DItgivesthe"pulldown"toQ1,shouldspeedup:)
SMGTHEGREAT February24,2014at11:59AMHelloall , Ihave tocodea
levelconverter Inverilogand implement it
inFPGAandshowtheoutput..!!Pleaseit'smyassignmentandIhandtofinishitasap..!!pleasesomeonereplyifyouhaveanybriefideaaboutthatReply
UmarKhan
April19,2014at7:44PMIhaveaproteusfileinthisregard..!howcanIuploadithere?!Reply
ShafiqAhmadChohan
November1,2014at10:37PMThisisn'tworkingasalevelshifteritsworkingasvoltageregulatorReply
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3/24/2015 Simple3.3V5Vlevelshifter|IncredibleDIY
http://www.incrediblediy.com/2013/02/simple33v5vlevelshifter.html
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