Logic & Flip Flops-SN74LVC74APWR
Litšobotsi tsa Sehlahisoa
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Litokomane & Media
MOSEBETSI MOFUTA | LINKI |
Li-datasheets | SN54LVC74A, SN74LVC74A |
Sehlahisoa se hlahang | Litharollo tsa Analog |
PCN Packaging | Reel 10/Jul/2018 |
HTML Datasheet | SN54LVC74A, SN74LVC74A |
Mefuta ea EDA | SN74LVC74APWR ka SnapEDA |
Maemo a Tikoloho le Liantle
LEHLOKOA | TLHALOSO |
Boemo ba RoHS | ROHS3 e lumellana |
Boemo ba Sensitivity ea Mongobo (MSL) | 1 (E se nang moeli) |
FIHLELA Boemo | FIHLELA E sa ameheng |
ECCN | TSEBE99 |
HTSUS | 8542.39.0001 |
Flip-Flop le Latch
Flip flopleLatchke lisebelisoa tse tloaelehileng tsa elektronike tse nang le libaka tse peli tse tsitsitseng tse ka sebelisoang ho boloka boitsebiso, 'me flip-flop kapa latch e le' ngoe e ka boloka 1 bit ea boitsebiso.
Flip-Flop (E khutsufalitsoeng ka hore ke FF), e tsejoang hape e le heke e ka bistable, e tsejoang hape e le bistable flip-flop, ke potoloho ea logic ea dijithale e ka sebetsang liprofinseng tse peli.Li-flip-flops li lula li le boemong ba tsona ho fihlela li fumana molumo oa ho kenya letsoho, o tsejoang hape e le "trigger".Ha ho amoheloa pulse ea ho kenya letsoho, tlhahiso ea flip-flop e fetola boemo ho latela melao ebe e lula e le boemong boo ho fihlela ho amoheloa mohloli o mong.
Latch, e tsotellang boemo ba pulse, e fetola boemo tlas'a boemo ba pulse ea oache, latch ke sebaka sa polokelo se hlahisoang ke boemo, 'me ketso ea polokelo ea data e itšetlehile ka boleng ba lets'oao la ho kenya, feela ha latch e le ka har'a nolofalletsa boemo, tlhahiso e tla fetoha ka ho kenya data.Latch e fapane le flip-flop, ha e latching data, lets'oao la tlhahiso le fetoha ka lets'oao la ho kenya, joalo ka ha lets'oao le feta ka har'a buffer;hang ha lets'oao la latch le sebetsa joalo ka latch, data e notletsoe mme lets'oao la ho kenya ha le sebetse.Latch e boetse e bitsoa "transparent latch", e bolelang hore tlhahiso e pepenene ho kenyelletso ha e sa lache.
Phapang lipakeng tsa latch le flip-flop
Latch le flip-flop ke lisebelisoa tsa polokelo ea binary tse nang le ts'ebetso ea memori, e leng e 'ngoe ea lisebelisoa tsa mantlha tsa ho etsa li-circuits tse fapaneng tsa nako.Phapang ke: latch e amana le lipontšo tsohle tsa eona tsa ho kenya, ha lets'oao la ho kenya le fetola liphetoho tsa latch, ha ho na terminal ea oache;flip-flop e laoloa ke oache, ha feela oache e hlahisoa ho etsa sampole se kentsoeng hona joale, hlahisa tlhahiso.Ehlile, hobane latch le flip-flop ke logic ea nako, tlhahiso ha e amane feela le tlhahiso ea hajoale, empa e amana le tlhahiso e fetileng.
1. latch e hlahisoa ke boemo, eseng taolo ea synchronous.DFF e hlahisoa ke moeli oa oache le taolo ea synchronous.
2, latch e ela hloko boemo ba ho kenya letsoho 'me e angoa ke ho lieha ha mohala, kahoo ho thata ho netefatsa hore sehlahisoa ha se hlahise li-burrs;DFF ha e na monyetla oa ho hlahisa li-burrs.
3, Haeba u sebelisa li-circuits tsa heke ho haha latch le DFF, latch e sebelisa lisebelisoa tse fokolang tsa heke ho feta DFF, e leng sebaka se phahameng sa latch ho feta DFF.Ka hona, kopanyo ea ho sebelisa latch ho ASIC e phahame ho feta DFF, empa se fapaneng ke 'nete ho FPGA, hobane ha ho na yuniti e tloaelehileng ea latch ho FPGA, empa ho na le yuniti ea DFF,' me LATCH e hloka ho feta LE e le 'ngoe ho elelloa.latch ke boemo bo qalileng, bo lekanang le ho ba le qetello ea ho nolofalletsa, 'me ka mor'a ho kenya ts'ebetsong (ka nako ea ho nolofalletsa boemo) e lekana le terata, e fetohang ka Phallo e fapana le tlhahiso.Boemong bo sa lumelloang ke ho boloka lets'oao la mantlha, le ka bonoang le phapang ea flip-flop, ha e le hantle, hangata latch ha e nke sebaka sa ff.
4, latch e tla fetoha tlhahlobo e thata haholo ea nako e tsitsitseng.
5, hajoale, latch e sebelisoa feela potolohong e phahameng haholo, joalo ka Intel's P4 CPU.FPGA e na le yuniti ea latch, yuniti ea ngoliso e ka hlophisoa joalo ka yuniti ea latch, bukeng ea xilinx v2p e tla hlophisoa joalo ka yuniti ea register/latch, sephutheloana ke setšoantšo sa sebopeho sa xilinx half slice.Mefuta e meng le baetsi ba li-FPGA ha ba ea ho ea hlahloba.--Ka bonna, ke nahana hore xilinx e khona ho tsamaisana ka kotloloho le altera e kanna ea ba bothata bo boholo, ho LE ba 'maloa ho e etsa, leha ho le joalo, eseng sesebelisoa sa xilinx selae se seng le se seng se ka hlophisoa joalo, sebopeho sa altera feela sa DDR se na le yuniti e khethehileng ea latch, ka kakaretso feela. potoloho ea lebelo le phahameng e tla sebelisoa moralong oa latch.altera's LE ha se sebopeho sa latch, 'me u hlahlobe sp3 le sp2e, le tse ling hore u se ke ua hlahloba, buka e re tlhophiso ena e tšehetsoa.Polelo ea wangdian mabapi le altera e nepahetse, altera's ff e ke ke ea hlophisoa hore e be le latch, e sebelisa tafole ea ho sheba ho kenya ts'ebetsong latch.
Molao o akaretsang oa moralo ke: qoba latch ho meralo e mengata.e tla u tlohella hore u rale nako e felile, 'me e ipatile haholo, eo e seng mohlabani a ke ke a e fumana.latch kotsi e kholo ke ho se sefa li-burrs.Sena se kotsi haholo bakeng sa boemo bo latelang ba potoloho.Ka hona, ha feela u ka sebelisa sebaka sa D flip-flop, u se ke ua sebelisa latch.