CH344L是一款USB总线的转接芯片，实现USB转四个异步串口UART0/1/2/3功能，用于为计算机扩展异步串口，或者将普通的串口设备或者MCU直接升级到USB总线。
USB转4串口芯片CH344
CH344Q为480Mbps高速USB设备接口，CH344L为12Mbps全速USB设备接口。
内置固件，仿真标准串口，用于升级原串口外围设备，或者通过USB增加额外串口。
计算机端Windows操作系统下的串口应用程序完全兼容，无需修改。
支持免安装的操作系统内置CDC类驱动程序或者多功能高速率的VCP厂商驱动程序。
硬件全双工串口，内置独立的收发缓冲区。
CH344Q支持通讯波特率1200bps～6Mbps，CH344L支持1200bps～230400bps。
串口支持8个数据位，支持奇校验、偶校验以及无校验。
每个串口内置1024字节的接收FIFO，512字节的发送FIFO。
支持常用的MODEM联络信号CTS和RTS。
支持CTS和RTS硬件自动流控。
支持半双工，提供串口正在发送状态指示TNOW，可用于控制RS485收发切换。
支持最多16路GPIO输入输出功能。
通过外加电平转换器件，支持RS232、RS485、RS422等接口。
内置EEPROM，可配置芯片VID、PID、最大电流值、厂商和产品信息字符串等参数。
单一3.3V供电。
提供LQFP48无铅封装，兼容RoHS。
CH344Q
CH344L
MAX3223EEAPTR
MAX3223EEPP
MAX3223EEUP
MAX3223EEUP-SAMPLE
MAX3223EEUP-STRIP
MAX3223EEUPTR
MAX3223CUP
MAX3223EBEAP
MAX32223CAP
MAX3222CPN
MAX3222CAP
MAX3222EBCAP
MAX3222EBEAP
MAX3222EAP
MAX3222EBUP
MAX3222CUP
MAX3222EEPTR
MAX3222EEWN
MAX3222EPN
MAX3222EEAP
MAX3222ECWN
MAX3222ECUP
MAX3222ECPN
MAX3223CAP
MAX3223CPP
MAX320EPA
MAX320CSA
MAX3209EEUU
MAX327EEE
MAX327EPE
MAX327ESE
MAX326EPE
MAX3272EGP
MAX3273EGG
MAX325EUA
MAX3262CAG
MAX325EPA
MAX325CSA
MAX325CUA
MAX324CPA
MAX3245EWI
MAX3245EEWI
MAX3245EEAI
MAX3245ECWI
MAX324EPA
MAX324ESA
MAX324CUA
MAX324CS
MAX3243EAI
MAX3243ECWITR-SAMPLE
MAX3243ECWITR
MAX3243EEAI
MAX3243EEUI
MAX3243ECAI
MAX3243IDW
MAX3243IDB
MAX3243EEUITR
MAX3243EEUP
MAX3243EEWI
MAX3244ECAI
MAX3244CAI
MAX3244CWI
MAX3244EAI
MAX3244ECWI
MAX3244EEWI
MAX3245CWI
MAX333AEWP
MAX333AEUP
MAX333AEAP
MAX333AEPP
MAX333ACWP
MAX333ACPP
MAX333ACAP
MAX3325EAI
MAX3325ENI
MAX333ACUP
MAX333EPP
MAX333CWP
MAX333CPP-2
MAX333EWP
MAX333CPP
MAX333CAP
MAX3320TCAP
MAX3320BEAP
MAX334EPE
MAX334MJE/HR
MAX334EWE
MAX335CNG
MAX334CWE
MAX334CPE
MAX336EPI
MAX336EAI
MAX336CAI
MAX335CWG
MAX335ENG
MAX329CWE
MAX3311EEUB
MAX3296CGI
MAX3297CUE
MAX329CPE
MAX3298CUE
MAX3299CUE
MAX3291EPD
MAX328EWE
MAX328EPE
MAX328CWE
MAX3292EPD
MAX3291ESD
MAX3317EEAP
MAX3318EAP
MAX3318ECAP
MAX3318EEUP
MAX3316EEAE
MAX3316ECUP
MAX3316EEUP
MAX3316EUP
MAX3317ECUP
MAX3311EUB
MAX3314ECUA
MAX3314ECSA
MAX3318EUP
MAX3319EEAE
MAX3320ACAP
MAX3320BCAP
MAX3320AEAP
MAX3286CHJ
MAX3288CUE
MAX3483ESA
MAX3485ECPA
MAX3485CSATR
MAX3485CSATR-SAMPLE
MAX3485CSA
MAX3483EESA
MAX3483ECSA
MAX3480EBCPI
MAX3471EUA
MAX3480AEPI
MAX3480EAEPI
MAX3480EACPI
MAX3480ACPI
MAX3463EPA
MAX3463ESA
MAX3461ESD
MAX3462CPA
MAX3463CSA
MAX3463CPA
MAX3461CSD
MAX3461CPD
MAX3461EPD
MAX3485EESA
MAX4377HAUA
MAX4378TAUD
MAX4378TASD
MAX428CPA
MAX4285ESA
MAX4288EUA
MAX4289ESA
MAX4281ESA
MAX427ESA
MAX4284ESD
MAX4284EEE
MAX4282EUA
MAX4298EUB
MAX4297EAG
MAX4294EUD
MAX4294ESD
MAX4292EUA
MAX4292EUB
MAX427CSA
MAX4244ESD
MAX4247AUB
MAX4242EUA
MAX4243EUB
MAX4256ESA
MAX4253ESD
MAX4252EUA
MAX4252ESA
MAX4251EUA
MAX4251ESA
MAX4278EUA
MAX4265EUA
MAX4266ESA
MAX4269EEE
MAX4268ESD
MAX4268EEE
MAX4267EUA
MAX4259EEE
MAX4256EUA
MAX4257EUA
MAX4258EUA
MAX4273ESE
MAX4278ESA
MAX4275ABEUA
MAX4275ABESA
MAX4270ESD
MAX4273EEE
MAX4331ESA
MAX4331EUA
MAX4327ESD
MAX4326EUA
MAX432CPA
MAX436CPD
MAX436EPD
MAX4367EUA
MAX4366EUA
MAX4367EGA
MAX4366EGA
MAX4370ESA
MAX4372TESA
MAX435ESD
MAX4362ESD
MAX4361ESA
MAX4361EUA
MAX4363EUP
MAX4362EUB
MAX4363ESP
MAX435EPD
MAX435CPD
MAX4353ESA
MAX4338EUB
MAX4351ESA
MAX4337EUA
MAX4358ECE
MAX4357ECD
MAX4354ESD
MAX4356ECD
MAX430EPA
MAX4299EUE
MAX4309ESA
MAX4305ESA
MAX4310EUA
MAX4311EEE
MAX4313EUA
MAX4312EEE
MAX4314ESD
MAX4322ESA
MAX4322EUA
MAX4323ESA
MAX3241EEAI
MAX3241ECAI
MAX3241EEWI
MAX3241EUI
MAX3241EAI
MAX3243CPW
MAX3243CPWTR
MAX3243CPWR
MAX3243CAI
MAX3238ECAI
MAX3238ECUP
MAX3238ECUPTR
MAX3238EEAI
MAX3238EAI
MAX3238CAI
MAX3237EEAI
MAX3238
MAX3241CAI
MAX3241CUI
MAX323ESA
MAX3238EEAITR
MAX323CPA
MAX3269CUB
MAX326CPE
MAX326EEE
MAX326CSE
MAX3268CUB
MAX3267CSA
MAX3263CAG
MAX3264CUE
MAX3265CUE
MAX3266CSA
MAX327CSE
MAX420CPA
MAX4205ESA
MAX419CSD
MAX4203ESA
MAX4202ESA
MAX4203EUA
MAX4200ESA
MAX4188EEE
MAX4187EEE
MAX4186ESD
MAX418CPD
MAX418CSD
MAX4189EEE
MAX4180EUTTR
MAX4180ESA
MAX4184ESA
MAX4182ESA
MAX4181ESA
MAX4193CSA
MAX418EPD
MAX418ESD
LM3280TLX
LM3280TLX-275
LM3280TLX-280
LM3280TLX-290
LM334H
LM334D
LM331N
LM100F
LM333KSTEEL
LM100A
LM334SMX
LM10017R
LM334SM
LM052L
LM334Z
LM0024CH
LM334MX
LM071L
LM334M
LM101AH
LM334MWC
LM101AH/883
LM3302N
LM101ABGC
LM32CIMT
LM101A
LM32EVAL
LM101ADE
LM3302
LM101AJ-14
LM329DZ
LM101AJ883
LM32CIMTX
LM101AL
LM330T50
LM102
LM330T-5.0
LM1036MX
LM1036M
LM330T5.0
LM102H
LM331
LM1036
LM331AN
LM1036N
LM3311SQX-HIOP
LM103H-3.9
LM2574NADJ
LM104
LM2574N-005
LM104H
LM2574N-005G
LM105H
LM2574N-12
LM105
LM2574N3.3
LM104H/S2
LM2574N15
LMC6442
LM2574N-ADJ
LM93CIMTX
LM2574N-15
LM4766
LM211DR2G
LM2575D2T5
LM211DT
LM2575HVM-ADJ
LM2904S-SAMPLE
LM2575HVN5.0
LM311DT
LM2575HVNADJ
LM385M
LM2575HVN-ADJ
LM239NG
LM2575HVN12
LM239PT
LM2575HVS15
LM336Z25
LM2575HVS-15
LM2901DR2
LM2575HVS5.0
LM139J
LM2575HVS-12
LM101AJ
LM2575-5.0
LM2940T
LM2575ADJ
LM1086IT-ADJ
LM2575D2T005
LM4040DIM3X-2.0
LM2574M-12
LM2907N-8
LM2574HVMX-ADJ
LM4051CIM3X-ADJ
LM2574HVN15
LM4051CIM3X-1.2
LM2574HVN-15
LM7805K
LM2574HVN5.0
LM211DR2
LM2574HVN-ADJ
LM211DR
LM2574MADJ
LM7805DTX
LMC6082IN
LM2574MX-15
LMC6024IN
LMC6024IMX
LM2574MX33
LM3876
LM2574MX50
LM3876T
LM3404EVAL
LM2574DWADJ
LM337TG
LM2574HV-12MWC
LM337TELLI802
LM2574HV-15MWC
LMK107BJ224KA-T
LM2574HV3.3MDC
LM78M06CT
LM2574HV3.3MWC
LM78M08ABDTX
LM2574HVM
LM324AD10R
LM25575MHX
LM317LD
LM25576EVAL
LM1084IT33
LM25576MH
LM2931ACD
LM317D2TG
LM339AM
LM1117MPX-2.85
LM1117MPX-1.8
LM1117MPX-2.5
LM1117IMP-ADJ
LM339J
LM1117IMPX-3.3
LM1117IMPX-5.0
LM1117MP-1.8
LM1117MP-3.3
LM339ADR
LM1117MP-2.5
LM1117IMPX-ADJ
LM338MDC
LM1085IS-ADJ
LM338MWC
LM1085ISX
LM338T
LM1085ISX-3.3
LM338KSTEEL
LM1085IT-3.3
LM337KMWC
LM1085IT-12
LM337KSTEEL
LM1085IT3.3
LM337LM
LM1085ISX-ADJ
LM1085IT-ADJ
LM337LMX
LM1085ITADJ
LM337LZ
LM1086CS-ADJ
LM337SX
LM1086CS33
LM1086CS-5.0
LM337T
LM1086CSX-ADJ
LM337S
LM1086CSX-3.3
LM337D2T
LM1086IS-3.3
LM337IMP
LM1086ILD-ADJ
LM337H
LM1086IS-1.8
LM337D2TR4G
LM1086CT-5.0
LM337HVKSTEEL
LM1086CT-ADJ
LM3370SD-3013
LM1084IS3.3
LM3370SD-3806
LM1084IS5.0
LM3370SD-3021EV
LM1084IS-ADJ
LM3370SD-3416
LM1084IT-5.0
LM3370SD-3021
LM1084IT5.0
LM1084ISX-ADJ
LM1085IS-3.3
LM1085IS12
LM1084IT-ADJ
LM1084ITADJ
LM1085BT-12
LM107H
LM106H
LM1084IS12
LM108
LM107D/883B
LM107H/883
LM3370SD-4221
LM107H883B
LM337BD2T
LM107H883
LM3370SDX-3013
LM1086IS-ADJ
LM3370SDX-3021
LM1086IS-5.0
LM3370SDX-3416
LM1086ISX-3.3
LM3370SDX-3806
LM1086ISX-1.8
LM3370SDX-4221
LM1086ISX-5.0
LM336Z-5.0
LM1086ISX-ADJ
LM336BZ-2.5
LM108A
LM336BZ-2.5/LFT1
LM108ADD
LM336BZ-2.5/LFT3
LM108AH
LM336BZ-2.5/T1
LM108AH/883B
LM336BZ-2.5/T3
LM108AH/883
LM336BZ-5.0
LM108AJ-8/883
LM336M-2.5
LM108AJ
LM336MX-2.5
LM108AH883Q
LM336M-5.0
LM109H/883
LM336Z-2.5
LM109H
LM108J-8
LM336BM-2.5
LM108J8/883
LM336BM-5.0
LM108J
LM336BMX-5.0
LM108H/883-B
LM108H/883Q
LM336-2.5MWC
LM108H883
LM336/B-2.5
LM108HB
LM335M
LM108D
LM335Z
LM119H-SMD
LM335AZ
LM119J
LM335AZT
LM119T
LM335AZX
LM335H
LM335AM
LM3352-3.0EVAL
LM3352-3.3EVAL
LM3352MTC-2.5
LM3352MTCX-2.5
LM3352MTCX-3.0
LM119J/C
LM3352MTCX-3.3
LM119J883
LM3351MMX
LM119W/883
LM3354MMX-1.8
LM119J/883QS
LM3354MM-3.3
LM118H/883
LM3354MM-5.0
LM118H
LM3354MM-4.1
LM118J8
LM311DG
LM118J8/883
LM309H
LM1194
LM308T
LM119F
LM3100EVAL
LM118WGPQML
LM3100MH
LM117K-STEEL
LM3100MHX
LM117K-MIL
LM309KSTEEL
LM117KSTEEL
LM309K
LM117K/883
LM310N
LM117K/STEEL
LM311
LM117K883
LM317AEMPX
LM117K883C
LM317AEMPEP
LM111M
LM317
LM111JGB
LM317AMDTX
LM111J-9
LM317AMDT
LM111W/883
LM317BD2T
LM111J-8/883
LM317BD2TG
LM112H
LM317AH
LM1131CN
LM317AMWC
LM113H
LM311M
LM117HVH
LM311MX
LM117H/883Q
LM311MWA
LM117HVH883
LM117HVHP
LM311MDA
LM117HVH/883QS
LM311N
LM117HVH/C
LM311P
LM117HP
LM341T50
LM117K
LM341T-15
LM117HVK/C
LM3411M5X-5.0
LM117HVK883
LM341T-12
LM117HVK
LM3411M5X-3.3
LM117HVK/883
LM3411M5-3.3
LM117HVH/883
LM3411AM5X33
LM117H/883
LM3411AM5X-3.3
LM117H
LM3411AM5X-5.0
LM117H/883B
LM3411AM5-5.0
LM1151
LM3411AM5-3.3
LM114AH
LM340T5/7805
LM111FE
LM340T-15
LM111BGB
LM340T-5.0
LM111H
LM340T5
LM111E/883Q
LM340K-12
LM111DE
LM340K-5.0
LM111D
LM340AT-5.0
LM1117T-ADJ
LM340AT5.0
LM111J/883B
LM340LAZ-15
LM111J/883C
LM340MP-5.0
LM111J/883
LM340LAH-5.0
LM111J-8
LM340LAH-12
LM111H883C
LM340LAZ-12
LM111H/883
LM340MPX-5.0
LM1117T-3.3
LM340S-12
LM1117SX-3.3
LM340S50
LM1117SX-ADJ
LM340S-5.0
LM1117MPX-5.0
LM340T-12
LM1117MPX-3.3
LM340SX-5.0
LM1117MPX-ADJ
LM340T12
LM1117IDT-3.3
LM340SX50
LM1117IDTX-3.3
LM1117DTX-1.8
LM339MX
LM1117DTX-5.0
LM339MDC
LM1117DTX-3.3
LM339MT
LM1117DT-ADJ
LM339MWC
MAX4190EUA
MAX4193ESA
MAX4193MJA/HR
MAX4199ESA
MAX4196ESA
MAX4198ESA
MAX4194ESA
MAX4195ESA
MAX417EPA
MAX417CPA
MAX4173HESA
MAX4173FESA
MAX4215EUA
MAX4213EUA
MAX421EWE
