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74HC/LS/HCT/F系列芯片的区别1、LS是低功耗肖特基，HC是高速COMS。LS的速度比HC略快。HCT输入输出与LS兼容，但是功耗低；F是高速肖特基电路；2、LS是TTL电平，HC是COMS电平。3、LS输入开路为高电平，HC输入不允许开路，hc一般都要求有上下拉电阻来确定输入端无效时的电平。LS却没有这个要求4、LS输出下拉强上拉弱，HC上拉下拉相同。5、工作电压不同，LS只能用5V，而HC一般为2V到6V；6、电平不同。LS是TTL电平，其低电平和高电平分别为0.8和V2.4，而CMOS在工作电压为5V时分别为0.3V和3.6V，所以CMOS可以驱动TTL，但反过来是不行的7、驱动能力不同，LS一般高电平的驱动能力为5mA，低电平为20mA；而CMOS的高低电平均为5mA；8、CMOS器件抗静电能力差，易发生栓锁问题，所以CMOS的输入脚不能直接接电源。74系列集成电路大致可分为6大类：.74××（标准型）；.74LS××（低功耗肖特基）；.74S××（肖特基）；.74ALS××（先进低功耗肖特基）；.74AS××（先进肖特基）；.74F××（高速）。近年来还出现了高速CMOS电路的74系列，该系列可分为3大类：.HC为COMS工作电平；.HCT为TTL工作电平，可与74LS系列互换使用；.HCU适用于无缓冲级的CMOS电路。这9种74系列产品，只要后边的标号相同，其逻辑功能和管脚排列就相同。根据不同的条件和要求可选择不同类型的74系列产品，比如电路的供电电压为3V就应选择74HC系列的产品系列电平典型传输延迟ns最大驱动电流(-Ioh/Lol)mAAHCCMOS8.5-8/8AHCTCOMS/TTL8.5-8/8HCCOMS25-8/8HCTCOMS/TTL25-8/8ACTCOMS/TTL10-24/24FTTL6.5-15/64ALSTTL10-15/64LSTTL18-15/24LVCACSLC注：同型号的74系列、74HC系列、74LS系列芯片，逻辑功能上是一样的。74LSxx的使用说明如果找不到的话，可参阅74xx或74HCxx的使用说明。有些资料里包含了几种芯片，如74HC161资料里包含了74HC160、74HC161、74HC162、74HC163四种芯片的资料。找不到某种芯片的资料时，可试着查看一下临近型号的芯片资料。7400QUAD2-INPUTNANDGATES与非门7401QUAD2-INPUTNANDGATESOC与非门7402QUAD2-INPUTNORGATES或非门7403QUAD2-INPUTNANDGATES与非门7404HEXINVERTINGGATES反向器7406HEXINVERTINGGATESHV高输出反向器7408QUAD2-INPUTANDGATE与门7409QUAD2-INPUTANDGATESOC与门7410TRIPLE3-INPUTNANDGATES与非门7411TRIPLE3-INPUTANDGATES与门74121ONE-SHOTWITHCLEAR单稳态74132SCHMITTTRIGGERNANDGATES触发器与非门7414SCHMITTTRIGGERINVERTERS触发器反向器741534-LINETO1LINESELECTOR四选一741552-LINETO4-LINEDECODER译码器74180PARITYGENERATOR/CHECKER奇偶发生检验741914-BITBINARYCOUNTERUP/DOWN计数器7420DUAL4-INPUTNANDGATES双四输入与非门7426QUAD2-INPUTNANDGATES与非门7427TRIPLE3-INPUTNORGATES三输入或非门74308-INPUTNANDGATES八输入端与非门7432QUAD2-INPUTORGATES二输入或门74382-INPUTNANDGATEBUFFER与非门缓冲器7445BCD-DECIMALDECODER/DRIVERBCD译码驱动器7474D-TYPEFLIP-FLOPD型触发器7475QUADLATCHES双锁存器7476J-KFLIP-FLOPJ-K触发器74854-BITMAGNITUDECOMPARATOR四位比较器74862-INPUTEXCLUSIVEORGATES双端异或门74HC00QUAD2-INPUTNANDGATES双输入与非门74HC02QUAD2-INPUTNORGATES双输入或非门74HC032-INPUTOPEN-DRAINNANDGATES与非门74HC04HEXINVERTERS六路反向器74HC05HEXINVERTERSOPENDRAIN六路反向器74HC082-INPUTANDGATES双输入与门74HC107J-KFLIP-FLOPWITHCLEARJ-K触发器74HC109AJ-KFLIP-FLOPW/PRESETJ-K触发器74HC11TRIPLE3-INPUTANDGATES三输入与门74HC112DUALJ-KFLIP-FLOP双J-K触发器74HC113DUALJ-KFLIP-FLOPPRESET双JK触发器74HC123ARETRIGGERABLEMONOSTAB可重触发单稳74HC125TRI-STATEQUADBUFFERS四个三态门74HC126TRI-STATEQUADBUFFERS六三态门74HC1322-INPUTTRIGGERNAND施密特触发与非门74HC13313-INPUTNANDGATES十三输入与非门74HC1373-TO-8DECODERSW/LATCHES3-8线译码器74HC1383-8LINEDECODER3线至8线译码器74HC1392-4LINEDECODER2线至4线译码器74HC14TRIGGEREDHEXINVERTER六触发反向器74HC14710-4LINEPRIORITYENCODER10-4编码器74HC1488-3LINEPRIORITYENCODER8-3编码器74HC1498-8LINEPRIORITYENCODER8-8编码器74HC1518-CHANNELDIGITALMUX8通道多路器74HC153DUAL4-INPUTMUX双四输入多路器74HC1544-16LINEDECODER4线至16线译码器74HC1552-4LINEDECODER2线至4线译码器74HC157QUAD2-INPUTMUX四个双端多路器74HC161BINARYCOUNTER二进制计数器74HC163DECADECOUNTERS十进制计数器74HC164SERIAL-PARALLELSHIFTREG串入并出74HC165PARALLEL-SERIALSHIFTREG并入串出74HC166SERIAL-PARALLELSHIFTREG串入并出74HC173TRI-STATEDFLIP-FLOP三态D触发器74HC174HEXDFLIP-FLOPW/CLEAR六D触发器74HC175HEXDFLIP-FLOPW/CLEAR六D触发器74HC181ARITHMETICLOGICUNIT算术逻辑单元74HC182LOOKAHEADCARRYGENERATR进位发生器74HC190BINARYUP/DNCOUNTER二进制加减计数器74HC191DECADEUP/DNCOUNTER十进制加减计数器74HC192DECADEUP/DNCOUNTER十进制加减计数器74HC193BINARYUP/DNCOUNTER二进制加减计数器74HC1944BITBI-DIRSHIFT4位双向移位寄存器74HC1954BITPARALLELSHIFT4位并行移位寄存器74HC20QUAD4-INPUTNANDGATE四个四入与非门74HC221ANON-RETRIGMONOSTAB不可重触发单稳74HC2373-8LINEDECODER地址锁3线至8线译码器74HC242/243TRI-STATTRANSCEIVER三态收发器74HC244OCTAL3-STATEBUFFER八个三态缓冲门74HC245OCTAL3-STATETRANSCEIVER三态收发器74HC2518-CH3-STATEMUX8路3态多路器74HC253DUAL4-CH3-STATEMUX4路3态多路器74HC257QUAD2-CH3-STATEMUX4路3态多路器74HC2582-CH3-STATEMUX2路3态多路器74HC2593-8LINEDECODER8位地址锁存译码器74HC266A2-INPUTEXCLUSIVENORGATE异或非74HC27TRIPLE3-INPUTNORGATE三个3输入或非门74HC273OCTALDFLIP-FLOPCLEAR8路D触发器74HC2809BITODD/EVENGENERATOR奇偶发生器74HC2834BITBINARYADDERCARRY四位加法器74HC2993-STATEUNIVERSALSHIFT三态移位寄存74HC308-INPUTNANDGATE8输入端与非门74HC32QUAD2-INPUTORGATE四个双端或门74HC34NON-INVERTER非反向器74HC3548-CH3-STATEMUX8路3态多路器74HC3568-CH3-STATEMUX8路3态多路器74HC365HEX3-STATEBUFFER六个三态缓冲门74HC3663-STATEBUFFERINVERTER缓冲反向器74HC3673-STATEBUFFERINVERTER缓冲反向器74HC3683-STATEBUFFERINVERTER缓冲反向器74HC3733-STATEOCTALDLATCHES三态D型锁存器74HC3743-STATEOCTALDFLIPFLOP三态D触发器74HC3934-BITBINARYCOUNTER4位二进制计数器74HC4016QUADANALOGSWITCH四路模拟量开关74HC402014-StageBinaryCounter14输出计数器74HC4017DecadeCounter/Dividerwith10DecodedOutputs十进制计数器带10个译码输出端74HC404012StageBinaryCounter12出计数器74HC4046PHASELOCKLOOP相位监测输出器74HC4049LEVELDOWNCONVERTER电平变低器74HC4050LEVELDOWNCONVERTER电平变低器74HC40518-CHANALOGMUX8通道多路器74HC40524-CHANALOGMUX4通道多路器74HC40532-CHANALOGMUX2通道多路器74HC406014-STAGEBINARYCOUNTER14阶BIN计数74HC4066QUADANALOGMUX四通道多路器74HC4075TRIPLE3-INPUTORGATE3输入或门74HC42BCDTODECIMALBCD转十进制译码器74HC423ARETRIGGERABLEMONOSTAB可重触发单稳74HC4511BCD-7SEGDRIVER/DECODER7段译码器74HC45144-16LINEDECODER4至16线译码器74HC4538ARETRIGGERABMONOSTAB可重触发单稳74HC4543LCDBCD-7SEGLCD用的BCD-7段译码驱动74HC51ANDORGATEINVERTER与或非门74HC5218BITMAGNITUDECOMPARATOR判决定路74HC5333-STATEDLATCH三态D锁存器74HC5343-STATEDFLIP-FLOP三态D型触发器74HC5403-STATEBUFFER三态缓冲器74HC5413-STATEBUFFERINVERTER三态缓冲反向器74HC58DUALANDORGATE与或门74HC5893STATE8BITSHIFT8位移位寄存三态输出74HC