【应用】8路高速CMOS总线收发器74HC245M/TR用于液晶背光屏信号缓冲驱动，传播延迟低至7ns
大屏显示时代已经来临，无论下到日常使用的手机、中到家里看的电视、上到高楼大厦上的广告显示屏；都在朝着大屏幕的趋势发展，在提高视觉冲击的同时也提高了我们生活的质量水平；
在显示屏行业中除了常见的LED显示屏、OLED显示屏还有就是液晶显示屏；众所周知液晶显示屏原理区别于传统的LED显示屏，后者可以自发光，传统液晶显示屏需要背光才能正常显示；
目前液晶显示的背光方案出现了Local dimming技术，即液晶显示器背光区域调节技术。是指液晶显示系统将图像信号分成若干区域，并根据各区域图像亮度进行分析计算，然后自动控制各区域背光源的亮暗；图1所示，为Local dimming技术下的背光驱动板原理框图；主控平台根据用户控制产生显示信号给到缓冲，在分配到行和列的显示驱动上，进而驱动LED点阵屏的目的。
图1 LED显示屏原理框图
在背光板上和LED模组上担任一二级缓冲放大的是一种兼容TTL器件引脚的高速CMOS总线收发器74HC245；由于主控的数据/地址/控制总线端口都有一定的负载能力，但其仍无法直接驱动LED阵列，可以通过增加74HC245用于LED阵列的驱动的过渡。该收发器用于数据总线之间的异步双向通信。控制功能的实现将外部时间要求降到最低，74HC245设备允许数据从A总线传输到B总线或从B总线传输到A总线，这取决于方向控制(DIR)输入的逻辑电平。输出使能(OE)输入可以禁用设备，以便总线有效隔离。
其中华冠半导体的74HC245M/TR就是本文主要介绍的一款8路高速CMOS总线收发器，其3态输出可直接驱动总线，总线输入的迟滞改善了噪声容限，典型的传播延迟时间端口到端口7ns；该功能使其非常适合LED背光屏，高速信号缓冲放大设备，LED显示屏和其他更多的应用。
图2 74HC245M/TR和SN74HC245引脚
图2 所示，华冠半导体的74HC245M/TR和TI的SN74HC245引脚是Pin to Pin兼容的，方便我们在进行物料替换的时候，可以优先直接上板验证，不需要重新设计Layout。
最后，总结华冠半导体的74HC245M/TR用在LED背光屏上的优势：
1. 传播延迟时间端口到端口7ns，真正达到高速响应的目的；
2. 华冠半导体的74HC245M/TR和TI的SN74HC245引脚是Pin to Pin兼容，无需重新设计硬件；该芯片采用低压2至6V 直流供电，兼容电压范围宽，无需另外匹配电源系统电路；
3.相比于行业巨头国产货源充足，还可以提供及时的技术服务和稳定的供货支持。
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型号- HM8805-ADJ,HM29151,HM4115A,HM29152,HM61CXX2,HM5054B,HM4115B,HM809,HM54XXBM5,HM74HC595T,HM5430D4,HM74HC245D,HM8100,HM8101,DW01A,HM2675HV,HM8008DR,HM4115ES,HM5068,HM4115MR,HM5501,HM9708A,LMV358,TL494,HM78XX,HM4056HA,HM74HC245T,HM7805,HM4051AD2,HM4057E,HM2101K,HM4057H,JRC4558,LM2596HV,HM1509B,HM1509E,HM6033,HM6032,HM6030,HM74HC164,HM5056RD,HM5501DR,HM5056RD8,HM8008MR,HM3157,HM2101,HM61NXX2,JRC4560,HM56XXB,HM5056RE,HM2741,HM2740,LM393,HM116A,HM73XXH,HM73XXN,HM5055DR,HM5501MR,HM3140E,HM74HC138D,HM8005DR,HM4310,HM73XX,HM4275,HM4313,HM6216,HM6214,HM4057D6,HM4057D8,HM4051A,LM258,ULN2003A,HM7660,LMV393,MC34063,HM56XXBM5,HM3141E,HM317,HM4024,HM9715,HM1509HV,ULN2803A,HM6206,HM432,HM1156,HM54XXB,HM431,HM8005MR,HM4051ADR,HM6208,HM4057DR,HM73XXHB,HM1558,HM5460ANZ,HM75XXH,HM78XXM5,HM5415ARA,HM1509,HM62783A,ULN2004A,LMV321,HM5430D,HM8541,HM5056DR,HM8006DR,HM6235,HM4056,HM6234,HM4057,HM4054,HM3122,ULN2804A,HM5415ABA,HM3121,HM3005,HM75XXHB,HM5052MR,AMS1117B,HM117D,LM2596,LM358,LMV331,HM78L05,HM6230,HM5056ES,HM4054K,HM3232,HM5511B,LMV324,HM6226,HM8006MR,HM62784A,HM4054E,HM4070D8,LM2576HV,HM74HC04D,LM321,HM4056A,LM324,HM2675HVT,L9110E,HM2675HVS,L9110,HM8563,HM6382,HM75XX,HM1084,HM9921,HM9922,HM462,HM9923,HM465,HM53XXB,HM2103K,HM4055H,UC3842,HM4070DR,UC3843,HM4070,HM118,LM339,HM116,HM78M05,HM5415ASA,HM5208FM,AMS1117,HM5431,HM9910,HM6245,HM5155,HM5430,HM5831,HM1232,HM1234,DW03,HM232,HM5056D8,JRC4580,HM74HC595D,HM3139,HM1235,HM809系列,HM4056E
广东华冠半导体有限公司公司简介
型号- DS1302,TEA2025,HG7189,LM3916,DS1307,CD4069,IRF830,LM3915,LM3914,CD4075,CD4073,TL494,NE556,NE555,CD4078,CD4077,HGC5615,24C128,75N08,CD4071,KA7500,CD4070,FCF8563,74HC4067,LM432,HG2981,LM431,HG2980,LM2954,LM555,74HC32,74HC595,HG34C86,HG34C87,CD4068,CD4067,CD4066,74HC238,MC34119,MC34118,24C256,CD4060,MAX6576,LM4580,74HC00,HG202,IRF730,74HC03,HG7169,74HC02,CD4528,HG3480,70N06,74HC04,74HC07,CD4520,LM386-1,CD4094,LM1084,LM1085,LM1086,74HC4046,CD4093,20N60,HG335,HG1990,IRF840,74HC14,CD4518,HG1991,CD4517,HG7179,LM1881,24C64,CD4511,H3085,HG18B20,74HC573,HGC5620,74HC574,LF347,LM29302,74HC4053,74HC08,74HC4051,74HC4052,CD4081,HG1621,ZNBG4000,LP2951,LMV321,LP2950,CD4543,ICL8038,HG8F629,HG8F628,HG2803,HGC2543,LF398,HGC2549,HG2003,LM29150,HG2004,LM4250,HG13085,HG3232,HG235,IRF740,HG232,LM358,3N80,CD4538,CD4541,82N06,HG8F630,HG8F873,24C32,AD590,20N50,74HC273,LM321,HG485,LM324,LM567,4N60,13N50,MC1403,LM317M,24C08,LM317L,74HC123,74HC244,74HC245,HG8F887,74HC125,HG8F883,LM317T,24C02,24C01,24C04,LM7660,LM331,HG135,LM336,LM78L12,LM78L15,74HC132,74HC374,LM29502,CD4562,74HC138,74HC139,24C16,74HC373,HG3421,HG3420,CD40106,LP2997,LP3965,LP2996,LP2995,11N90,12N60,LM78L05,LM78L06,MC3845,LM78L08,LM78L09,MC3842,LMV358,93C06,MC3844,MC3843,TDA2822,9N90,LM385,LM78M12,TDA2030,75N75,LM78M15,HG8F676,HG8F675,LM4860,74HC192,HG3423,HG1487,HG3422,LM1117,LM4862,LM4861,LM4863,ZNBG3211,74HC86,CD4007,LM78M05,74HC165,LM78M06,TL072,TDA2003,LM78M08,LM78M09,CD4013,CD4011,TL074,LM4990,50N06,28N60,HG8F683,LM4871,HG8F684,74HC164,HGC1549,HG298,LM2575,HG297,LM2576,HGC1543,74HC94,74HC93,MC34063,LM7905,TL082,LM809,CD4001,TL084,HG293,24C512,LM7915,LM741,LM7912,LM2904,CD4028,CD4027,CD4025,OP07,LM2901,10N80,LM2903,74HC540,74HC541,LM2909,LM4890,LM7805,LM7924,LM2596,CD4017,CD4015,LM7809,74HC74,LM7808,LM7806,CD4020,TL064,CD4024,CD4023,TL062,CD4022,10N60,LM7815,HG56,ZNBG6000,LM7812,74HCU04,CD4049,CD4053,CD4052,93C66,CD4051,CD4050,HG2623,HG2982,HG2985,HG2621,HG2622,LM4558,74LVC1G04,7N60,50N50,93C56,CD4040,CD4046,74HC533,74HC534,LM4560
【产品】8路双向总线接口的高速硅栅CMOS，工作温度-40～85℃，正相三态输出
74HC245是华冠半导体推出的一款高速硅栅CMOS器件，其引脚兼容低功耗肖特基TTL(LSTTL)系列。该电路完全符合JEDEC标准no.7A。74HC245是一款8路总线收发器，在发送和接收两个方向上都具有正相三态总线兼容输出。
华冠半导体LDO稳压器电路选型表
华冠半导体LDO稳压器电路工作电压范围-42~+45V，有多种输出电压可供选择，具有性能高，功耗低，工作稳定等特点，广泛应用于消费电子和工业领域
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产品型号
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品类
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工作电压（Vcc）(v)
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输出电流(A、mA)
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静态电流(Typ)(mA、uA)
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输出电压(V)
|
精度(%)
|
工作温度(°C)
|
封装
|
功能描述
|
|
LM1084
|
LDO稳压器电路
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2.5-20V
|
5A
|
10mA
|
1.5V;1.8V;2.5V;3.3V;5.0V;ADJ
|
2%
|
0°C-125°C
|
TO-263-2;TO-263-3;TO-220-3;TO-252-2
|
5ALDO稳压器电路
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选型表 - 华冠半导体 立即选型
【产品】华冠半导体推出的LMC555系列CMOS RC定时器，支持500kHz高速运行，工作电源电压范围宽至2~18V
华冠半导体推出的LMC555系列器件是CMOS RC定时器，该系列器件的性能参数提升主要包括低电源电流、宽工作电源电压范围、低阈值、触发和复位电流、在输出转换期间电源电流无过载、更高的频率特性以及无需解耦控制电压即可实现稳定运行。
同样是LED显示屏，价格差距为啥这么大
随着LED显示屏的应用日益广泛，各种LED显示屏厂家如雨后春笋般的冒出来，生产的LED显示屏价格也是高低不同，有些LED显示屏生产厂家的价格相差有时候会很大。其实，熟悉LED显示屏行业的人都知道很多因素影响着LED显示屏的价格，本文将从三个方面来解释影响LED显示屏价格的主要因素。
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可定制风扇尺寸覆盖18x18x04mm~165x165x25mm，随散热器大小而定制；风扇转速范围：1000 RPM~16500 RPM。支持DC风扇，直流风扇轴流风机，鼓风机以及电脑笔记本风扇等产品定制。
最小起订量： 500pcs 提交需求>
可定制射频隔离器/环行器（10M-40GHz），双工器/三工器（30MHz/850MHz-20GHz），滤波器（DC-20GHz），功分器，同轴负载，同轴衰减器等射频器件；可定制频率覆盖DC~110GHz，功率最高20KW。
最小起订量： 1 提交需求>
授权代理品牌：集成电路
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授权代理品牌：接插件及结构件
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