CMOS vs TTL
Nrog rau qhov kev tshwm sim ntawm semiconductor thev naus laus zis, kev sib xyaw ua ke tau tsim, thiab lawv tau pom nws txoj hauv kev rau txhua hom kev siv thev naus laus zis cuam tshuam nrog hluav taws xob. Los ntawm kev sib txuas lus mus rau cov tshuaj, txhua yam khoom siv muaj kev sib xyaw ua ke, qhov twg circuits, yog siv nrog cov khoom siv zoo tib yam yuav siv qhov chaw loj thiab lub zog, yog tsim los ntawm cov khoom siv me me silicon wafer siv cov khoom siv hluav taws xob siab tshaj plaws niaj hnub no.
Txhua qhov kev sib koom ua ke digital yog siv los ntawm cov rooj vag logic raws li lawv lub hauv paus tsev thaiv. Txhua lub rooj vag yog tsim los siv cov khoom siv hluav taws xob me xws li transistors, diodes thiab resistors. Cov txheej txheem ntawm cov rooj vag logic tsim siv cov transistors thiab cov resistors sib sau ua ke hu ua TTL rooj vag tsev neeg. Txhawm rau kov yeej qhov tsis txaus ntawm TTL cov rooj vag ntau cov txheej txheem thev naus laus zis tau tsim los rau kev tsim kho rooj vag, xws li pMOS, nMOS thiab cov khoom siv tam sim no thiab nrov tshaj plaws hlau oxide semiconductor hom, lossis CMOS.
Hauv kev sib xyaw ua ke, cov rooj vag tau tsim los ntawm silicon wafer, technically hu ua substrate. Raws li cov cuab yeej siv rau kev tsim kho lub rooj vag, ICs kuj tau muab faib ua cov tsev neeg ntawm TTL thiab CMOS, vim yog cov khoom siv ntawm lub qhov rooj tsim qauv xws li cov teeb liab voltage, kev siv hluav taws xob, lub sij hawm teb thiab qhov ntsuas ntawm kev sib koom ua ke.
Ntau txog TTL
James L. Buie ntawm TRW tau tsim TTL hauv xyoo 1961, thiab nws tau ua haujlwm hloov pauv rau DL thiab RTL logic, thiab yog IC ntawm kev xaiv rau kev ntsuas thiab lub computer circuits ntev. TTL txoj kev sib koom ua ke tau txuas ntxiv txhim kho, thiab cov pob khoom niaj hnub no tseem siv rau hauv cov ntawv tshwj xeeb.
TTL logic rooj vag yog tsim los ntawm kev sib txuas ntawm kev sib txuas bipolar transistors thiab resistors, los tsim lub rooj vag NAND. Input Low (IL) thiab Input High (IH) muaj qhov voltage ranges 0 < IL < 0.8 thiab 2.2 < IH < 5.0 raws. Cov Output Low thiab Output High voltage ranges yog 0 < OL < 0.4 thiab 2.6 < OH < 5.0 hauv qhov kev txiav txim. Qhov kev siv tau thiab cov zis voltages ntawm TTL rooj vag yog raug rau kev qhuab qhia zoo li qub los qhia qib siab ntawm kev tiv thaiv lub suab nrov hauv cov teeb liab kis.
A TTL rooj vag, qhov nruab nrab, muaj lub zog dissipation ntawm 10mW thiab kev nthuav tawm qeeb ntawm 10nS, thaum tsav tsheb 15pF / 400 ohm load. Tab sis kev siv hluav taws xob yog qhov tsis tu ncua piv rau CMOS. TTL kuj muaj kev tiv thaiv ntau dua rau kev cuam tshuam electromagnetic.
Ntau qhov sib txawv ntawm TTL yog tsim los rau cov hom phiaj tshwj xeeb xws li hluav taws xob tawv TTL pob khoom rau qhov chaw siv thiab qis-zog Schottky TTL (LS) uas muab kev sib xyaw ua ke ntawm kev ceev (9.5ns) thiab txo qis zog noj (2mW)
Ntau txog CMOS
Hauv xyoo 1963, Frank Wanlass ntawm Fairchild Semiconductor tau tsim lub tshuab CMOS. Txawm li cas los xij, thawj CMOS integrated circuit tsis tau tsim kom txog rau thaum 1968. Frank Wanlass patented invention nyob rau hauv 1967 thaum ua hauj lwm ntawm RCA, lub sij hawm ntawd.
CMOS logic tsev neeg tau dhau los ua cov tsev neeg logic siv dav tshaj plaws vim nws cov txiaj ntsig ntau yam xws li kev siv hluav taws xob tsawg thiab suab nrov tsawg thaum kis tau tus mob. Tag nrho cov microprocessors, microcontrollers, thiab integrated circuits siv CMOS technology.
CMOS logic rooj vag yog tsim los siv teb cov nyhuv transistors FETs, thiab cov circuitry feem ntau tsis muaj cov resistors. Raws li qhov tshwm sim, CMOS rooj vag tsis siv lub zog txhua lub sijhawm thaum lub xeev zoo li qub, qhov twg cov teeb liab inputs tseem tsis hloov. Input Low (IL) thiab Input High (IH) muaj qhov voltage ranges 0 < IL < 1.5 thiab 3.5 < IH < 5.0 thiab cov Output Low thiab Output High voltage ranges yog 0 < OL < 0.5 thiab 4.95 < OH < 5.0 raws.
Qhov txawv ntawm CMOS thiab TTL yog dab tsi?
• TTL cov khoom yog pheej yig dua li cov khoom sib npaug CMOS. Txawm li cas los xij, CMOs thev naus laus zis zoo li kev lag luam ntawm qhov loj dua vim tias cov khoom siv hluav taws xob tsawg dua thiab yuav tsum muaj kev tswj hwm tsawg dua piv rau TTL cov khoom.
• CMOS Cheebtsam tsis haus lub zog thaum lub sijhawm zoo li qub, tab sis kev siv hluav taws xob nce nrog lub moos. TTL, ntawm qhov tod tes, muaj kev siv hluav taws xob tas li.
• Txij li thaum CMOS muaj qhov yuav tsum tau ua tam sim no, kev siv hluav taws xob tsawg thiab cov circuits, yog li ntawd, pheej yig dua thiab yooj yim dua los tsim rau kev tswj fais fab.
• Vim lub sijhawm nce thiab poob ntev dua, cov teeb liab digital hauv CMOs ib puag ncig tuaj yeem pheej yig dua thiab nyuaj.
• CMOS Cheebtsam yog rhiab rau electromagnetic cuam tshuam ntau dua li TTL Cheebtsam.
