Kuyini ukudonsa kwamanje, ukuchelela kwamanje, umsinga odonsayo?

I-Pull current kanye ne-irrigation current yimingcele yokulinganisa amandla we-circuit output drive (Qaphela: ukudonsa nokunisela konke okokuphela kokuphumayo, ngakho-ke amandla omshayeli) amapharamitha. Lesi sitatimende sivame ukusetshenziswa kumasekhethi edijithali.

Lapha kufanele siqale sichaze ukuthi amandla okudonsa nokunisela kubhukwana le-chip yinani lepharamitha, okuwumkhawulo ongaphezulu wetheminali yokukhipha kanye nokunisela okwamanje kusekethe yangempela (amanani aphezulu avunyelwe).

Umqondo ozoshiwo ngezansi uyinani langempela kusekethe.

Ngoba ukuphuma kwamasekhethi edijithali kuphezulu kuphela, kuphansi (0, 1), inani likagesi:

Lapho okukhiphayo kwezinga eliphezulu kukhishwa, okukhiphayo ngokuvamile kunikezwa umthwalo. Inani lamanje libizwa ngokuthi "idonsa yamanje";

Lapho okukhiphayo kwezinga eliphansi ngokuvamile kuwukwamanje ukumunca umthwalo, inani lamanje lokumuncwa libizwa ngokuthi “i-irrigation (enter) current”.

Okwedivayisi yokokufaka kwamanje:

I-current engenayo kanye ne-absorption yamanje iyafakwa. I-current i-passive, futhi i-current absorption iyasebenza.

Uma i-current yangaphandle idlula kuphinikhodi, 'ukugeleza' ku-chip kubizwa ngokuthi umsinga wokunisela (ukuniselwa);

Ngokuphambene, uma i-current yangaphakathi ngephinikhodi ye-chip 'egelezayo' ibizwa ngokuthi i-pull current (ikhishwa);

Kungani ngingakwazi ukukala umthamo wokushayela okukhiphayo? Umgwaqo omkhulu

Lapho ukuphuma komnyango okunengqondo kuphansi, umsinga oniselwa emnyango we-logic ubizwa ngokuthi i-irrigation current. Ubukhulu bamanje bokunisela, bukhuphuka izinga eliphansi lokuphela kokuphumayo. Kungabonakala futhi ku-curve yesici esiphumayo se-triode. Ubukhulu bamanje bokuchelela, ukwehla kwamandla kagesi agcwele kakhulu, kanye nezinga eliphansi kakhulu. Kodwa-ke, izinga eliphansi lomnyango we-logic likhawulelwe, futhi linenani eliphakeme le-UOLMAX. Lapho usebenza emnyango we-logic, akuvunyelwe ukweqa leli nani. Izicaciso zomnyango we-TTL logic zicacisa i-UOLMAX ≤0.4 ～ 0.5V. Ngakho-ke, kunomkhawulo ophezulu wokunisela wamanje.

Lapho isiphetho somnyango onengqondo siphezulu, okwamanje ekugcineni komnyango ophusile ugeleza uphuma ngomnyango onengqondo. Lo msinga ubizwa ngokuthi i-pull current. Uma idonsa yamanje inkulu, izinga eliphezulu lokuphumayo liyancipha. Lokhu kungenxa yokuthi i-output -level triode inokumelana kwangaphakathi, futhi ukwehla kwe-voltage ekumelaneni kwangaphakathi kuzonciphisa i-voltage ephumayo. Uma idonsa yamanje inkulu, izinga eliphezulu lokuphumayo liyancipha. Kodwa-ke, izinga eliphezulu lomnyango we-logic lilinganiselwe, futhi linenani elincane le-UOHmin. Uma usebenza kumnyango we-logic, akuvunyelwe ukweqa leli nani. Ukucaciswa kokucaciswa komnyango we-TTL logic uohmin ≥2.4V. Ngakho-ke, kukhona futhi umkhawulo ophezulu wokudonsa okwamanje.

Kungabonakala ukuthi kunomkhawulo ophezulu kumanje wokudonsa kanye namandla okunisela ekugcineni kokuphumayo. Uma kungenjalo, lapho ukukhishwa kwezinga eliphezulu, ukudonsa kwamanje kuzokwehlisa izinga lokuphumayo kune-UOHMIN; lapho ukukhishwa kwezinga eliphansi, ukuchelela kwamanje kuzokwenza izinga lokuphumayo libe phezulu kune-UOLMAX.

Ngakho-ke, ukudonsa nokunisela kwamanje kubonisa amandla okukhiphayo. (I-chip enkulu yokudonsa kanye nenani lepharamitha yamanje yokunisela, kusho ukuthi i-chip ingaxhuma imithwalo eminingi, ngoba, njengamanje wokunisela ungumthwalo, umthwalo owengeziwe;

Ngenxa yokuthi i-high-level input current incane, ezingeni le-micro -level, ngokuvamile asikho isidingo sokuyicabangela. Izinga eliphansi lamanje likhulu futhi lisezingeni le-milliamp.

Ngakho-ke, ngokuvamile akukho nkinga ngokunisela okusezingeni eliphansi. Sebenzisa ifeni ukuchaza ikhono lomnyango onengqondo wokushayela iminyango efanayo. I-fan ephuma ebubeleni isilinganiso sezinga eliphezulu lokuphumayo lamanje kanye nokokufaka okuphezulu kwamanje kwezinga eliphansi.

Emjikelezweni odidiyelwe, i-suction current, idonsa okukhiphayo kwamanje kanye nokukhishwa kwamanje kokunisela kuwumqondo obaluleke kakhulu.

Donsela phezulu bese uvuza, okukhiphayo okusebenzayo, kuvela kokuphumayo kwamanje;

Ukunisela kuyashaja, i-passive input current, egeleza isuka endaweni yokuphuma;

Ukuhlupheka kuwukuhogela umoya wamanje, ogeleza usuka embobeni yokufaka. 

Umsinga wokumunca kanye nokuchelela okumanje kugeleza ku-chip kusuka kumjikelezo wangaphandle we-chip. Umehluko ukuthi ukumuncwa kwamanje kuyasebenza, futhi ukumuncwa kwamanje kugeleza kusuka ekugcineni kokufaka kwe-chip. Umsinga othelayo awusebenzi, futhi owamanje ogeleza usuka ekugcineni ophumayo ubizwa nge-current.

I-pull current iwumphumela wamanje ohlinzekwa ukukhishwa kwesekethe yedijithali izinga eliphezulu ekulayisheni. Izinga eliphansi lokukhipha lapho ukuchelela kwamanje kuyi-input current kusekethe yedijithali. Empeleni zingamakhono wamanje okokufaka nokukhiphayo.

I-current yokumunca ingeyetheminali yokufaka (input end input), kanti i-pull current (i-output end ephumayo) kanye nomsinga wokunisela (i-output end iyaniselwa) iwumphumela uma kuqhathaniswa.