【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

时间： 2022-08-23 来源：世强

技术问答

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。

发送到邮箱 |
+1 赞 0
收藏
评论 0
| 转发至：

本文由Kazaf提供，版权归世强硬创平台所有，非经授权，任何媒体、网站或个人不得转载，授权转载时须注明“来源：世强硬创平台”。

全部评论（0）

暂无评论

【应用】2~6V直流供电的8路高速CMOS总线收发器用于LED显示屏，传播延迟时间端口到端口仅8ns

信路达的XL74HC245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，PNP输入减少总线上的直流负载，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8ns，可用在LED显示屏。

应用方案发布时间 : 2021-11-16

【应用】华冠半导体LDO LM1117MP-3.3/TR用于配电柜，可为主控芯片提供3.3V稳定电压

客户做一款配电柜项目，在给MCU供电电路设计中需要用到一个低压差线性稳压器。本文推荐华冠半导体的LDO LM1117MP-3.3/TR，具备有宽输入电压，最大20V，输出电流最大1A；固定电压输出电压精度为1％；高纹波抑制比达75dB。

应用方案发布时间 : 2023-03-11

【应用】华冠半导体PWM控制器UC3845M用于DC-DC电源，工作频率高达500kHz

某客户在设计一款DC-DC电源，需求国产的PWM控制器。本文根据需求推荐华冠半导体PWM控制器UC3845M，采用固定频率电流模式，工作频率高达500kHz；可以在50%的占空比内运行；相应阈值为8.4V（开）和7.6V（关）。

应用方案发布时间 : 2022-12-24

华冠半导体（HGSEMi）半导体器件选型指南

目录- 公司简介 MOS管/比较器/存储器电路/达林顿阵列电源管理电路低压差稳压器线性稳压/通用接口电路驱动/音频电路运算放大器/时基与时钟/逻辑电路&其他电路微处理器运放接口半导体器件概览

型号- HG9923,DS1302,TEA2025,DS1307,CD4069,XC61C-XX,CD4075,CD4073,TL494,NE556,NE555,CD4078,CD4077,75N08,HGC5615,24C128,CD4071,CD4070,KA7500,HG9261XX,FCF8563,LM3480,74HC4067,LM311,LM432,LM431,LM555,LM317,74HC32,74HC595,CD4068,CD4067,CD4066,74HC238,HG51031,CD4060,24C256,HG1201-XX,HG9921,MAX6576,HG9922,LM4580,74HC00,74HC03,HG202,74HC02,MAX3085,74HC04,HG3480,74HC07,HGV8144,HGV8142,CD4094,LM386-1,HGV8141,LM1084,LM1085,HG29100-XX,LM1086,HGC29300-XX,CD4093,74HC4046,LM1081,HG9910,LM1083,HG335,74HC14,LM79XX,HG24C08B,HG18B20,74HC573,74HC574,HGC5620,74HC4053,74HC08,HGC29150-XX,74HC4051,74HC4052,HGV8091N,CD4081,LM385-2.5,LP2954,ZNBG4000,LP2951,LMV321,LP2950,ICL8038,HG8F629,74C194,HG8F628,NE594,HGC2543,MAX7219,HG75176,HGC2549,HG2003,HGV8092N,LM29150,HG2004,LM4250,HG13085,HG3232,HG235,LM78XX,HG232,HG1051,LM358,HG1052,HGV8558,HGV8555,HGV8556,HGV8554,LM2937-XX,HGV8551,HGV8552,CA3140,HG8F630,HG8F873,AD590,74HC273,HG2593,LM1117-XX,LM321,HG485,HG2591,LP3965-XX,LM324,HG2592,LM567,13N50,LM317M,LM317L,74HC123,74HC244,74HC245,74HC125,HG8F887,HG8F883,LM317T,LM7660,LM331,HG135,HG0066,HG0065,HGC1589,LM336,HGV8965N,LM339,HGV8334,HGV8331,HGV8332,74HC132,74HC374,74HC138,74HC139,DS1990,74HC373,LM386,CD40106,LP2997,LP3965,LP2996,LP2995,XC62FP-XX,LM78L05,LM78L06,MC3845,LM78L08,LM78L09,LMV358,MC3842,MC3844,9N90,MC3843,TDA2822,LM385,HG6008,HG24C02B,HGV2774,HGV2771,HG5171,HGV2772,TDA8138,LM78M12,TDA8137,LM78M15,HGC5213-XX,74HC192,74HC193,74HC194,LM393,HG3085,ZNBG3211,HG24C256,MAX487,74HC86,MAX489,74HC165,LM78M05,HG1582-XX,MAX488,LM78M06,TL072,LM2940-XX,HGV258,LM78M08,LM78M09,TL074,50N06,28N60,74HC164,HGC1549,ULN2803,ULN2804,HG298,HG297,HG24C128,HGC1543,MAX232,TL082,HGV8094,HGV8092,TL084,HG1203-XX,HGV8091,HG293,LMC555,HG54123,LM2904,HG6570,LM2901,HGV8048,LM2902,HGV8045,LM2903,HGV8046,HGV8044,HGV358,HGV8041,HGV8042,85N06,HG3078,MAX490,HG3075,MAX491,HG3072,74HC74,HGV224,TL064,TL062,HGV221,MIC5212,HG1108-XX,HGV8064,HGV8061,HGV8062,HG24C04B,HG24C16B,DS75176,50N50,HGV8054,HGV324,HGV321,LM8002,XC62GR-XX,HG24C32,HGC29500-XX,HGV8928,TEA2822,HG75HVD3082E,HG7189,LM3916,LM78LXX,IRF830,LM3915,HG93C56,LM3914,TL064C,HGC8F630,MXA485,HG2981,HG2980,LM2954,HG93C46,LM285-2.5,HGC52XX,HG34C86,HG34C87,HGC8F629,MAX13805,MC34119,MC34118,LM2576-XX,IRF730,HG8137,CD4528,HG7169,70N06,LM78MXX,CD4520,TLC2543,HG8138A,HG1734,HG1735,20N60,HG1185-XX,HG1851,IRF840,CD4518,HG1990,CD4517,HG1991,LM285-1.2,HG7179,LM1881,24C64,CD4511,LM2931-XX,HGL297,HGL298,HG93C66,HG1509,KA7500B,LF347,LM29302,HG1501,HGC8F887,HG1621,HG75LBC184,HG75LBC182,CD4543,TL072C,TL084C,HG2803,HGL293,LF398,HG75LBC176,IRF740,3N80,CD4538,CD4541,XC62GP-XX,24C32,HG1205-XX,20N50,MAX1487,4N60,MC1403,24C08,MAX202,TL074C,TL062C,TLC5615,HG1937,LM2575-XX,HG1932,24C02,24C01,24C04,HG7012,CD1046,LM78L12,LM78L15,CD4562,HG809,LM29502,24C16,HG2571,HG2572,HG2573,HG3421,HG3420,11N90,12N60,ICL7660,93C06,HGC5219,LM2596-XX,CD1068,HGV8725N,TDA2030,75N75,HG8F676,HG8F675,LM4860,HG3423,HG1487,HG3422,HGV8061N,LM3414,HG1583,LM1117,LM4862,LM4861,HG1580,LM4863,TL082C,CD4007,LM385-1.2,HG1208-XX,TDA2003,CD4013,CD4011,HGV8062N,LM4990,LM4871,HG8F683,HG8F684,ULN2003,ULN2004,LM2574,LM2575,HGV8538,LM2576,HGV8535,HGV8536,HGV8534,HGV8531,MC34063,HGV8532,LM7905,LM809,CD4001,HG3526,HG3525,24C512,HG3524,LM35,LM7915,LM741,LM7912,HGV8968,HGV8726,HGC8F683,HGV8966,HGV8725,CD4028,HG24C512,CD4027,HGV8965,CD4025,OP07,10N80,74HC540,74HC541,ICL7106,PCF8563,ICL7107,HG4824,HGV8052N,LM4890,HGC8F676,HGC8F675,LM7805,LM7924,TD62083A,LM2596,CD4017,LM79LXX,CD4015,LM7809,LM7808,LM7806,CD4020,HGV2771N,CD4024,CD4023,CD4022,HG26C31,HG26C32,10N60,LM56,LM7815,HG56,ZNBG6000,LM7812,TD62084A,HG70XX,74HCU04,NE5532,CD4049,CD4053,CD4052,CD4051,93C66,CD4050,HG2982,HG2985,UC3845,LM4558,HG24C64,74LVC1G04,UC3842,UC3843,UC3844,LM79MXX,7N60,TLC1543,93C56,CD4040,CD4046,74HC533,74HC534,LM4560,HGC8F684

选型指南 - 华冠半导体 - 2019/9/11 PDF 中文下载

华冠半导体宣传册

型号- HG9923,DS1302,TEA2025,DS1307,CD4069,MAX187,XC61C-XX,CD4075,CD4073,TL494,NE556,NE555,CD4078,CD4077,MC34U8,75N08,HGC5615,24C128,CD4071,CD4070,KA7500,HG9261XX,FCF8563,LM3480,74HC4067,LM311,LM432,LM431,LM555,LM317,74HC32,74HC595,CD4068,CD4067,CD4066,74HC238,HG51031,CD4060,24C256,HG1201-XX,HG9921,MAX6576,HG9922,LM4580,74HC00,74HC03,HG202,HG1205-H,74HC02,MAX3085,74HC04,HG3480,74HC07,CD4094,LM386-1,LM1084,LM1085,HG29100-XX,LM1086,LM1087,HGC29300-XX,CD4093,74HC4046,HG9910,LM1083,HG335,74HC14,LM79XX,HG24C08B,HG18B20,74HC573,74HC574,HGC5620,74HC4053,74HC08,HGC29150-XX,74HC4051,74HC4052,CD4081,LP2954,ZNBG4000,LP2951,LMV321,LP2950,ICL8038,HG8F629,HG8F628,NE594,HGC2543,MAX7219,HG75176,HGC2549,HG2003,LM29150,HG2004,LM4250,HG13085,HG3232,HG235,LM78XX,HG232,HG1051,LM358,HG1052,HGV8558,HGV8556,HGV8554,LM2937-XX,HGV8551,HGV8552,CA3140,HG8F630,HG8F873,AD590,74HC273,HG2593,LM1117-XX,LM321,HG485,HG2591,LP3965-XX,LM324,HG2592,LM567,13N50,LM317M,LM317L,74HC123,74HC244,74HC245,74HC125,HG8F887,HG8F883,LM317T,LM7660,LM331,HG135,HG0066,HG0065,HGC1589,LM336,HGV8965N,LM339,HGV8331,74HC132,74HC374,74HC138,74HC139,DS1990,74HC373,LM386,CD40106,LM385-1.2 2.5,LP2997,LP3965,LP2996,LP2995,XC62FP-XX,LM78L05,LM78L06,MC3845,LM78L08,74IIC164,LM78L09,LMV358,MC3842,MC3844,9N90,MC3843,TDA2822,LM385,HG6008,HG24C02B,HGV2774,HGV2771,HG5171,HGV2772,TDA8138,LM78M12,TDA8137,LM78M15,HGC5213-XX,74HC192,74HC193,74HC194,LM393,HG3085,ZNBG3211,HG24C256,74HC86,MAX489,74HC165,HG1582-XX,MAX488,LM78M06,TL072,LM2940-XX,HGV258,LM78M08,LM78M09,IIG34C87,TL074,50N06,28N60,74HC164,HGC1549,ULN2803,ULN2804,HG298,HG297,HG24C128,HGC1543,MAX232,TL082,TL084,HG1203-XX,HG293,LMC555,HG54123,LM285-1.2 2.5,LM2904,HG6570,LM2901,LM2902,LM2903,HGV358,85N06,HG3078,MAX490,HG3075,MAX491,HG3072,74HC74,HGV224,TL064,TL062,HGV221,MIC5212,HG1108-XX,HG24C04B,HG24C16B,DS75176,74IIC238,50N50,HGV8054,HGV324,74IIC04,TRF830,HGV321,LM8002,XC62GR-XX,HG24C32,HGC29500-XX,TEA2822,HG75HVD3082E,HG7189,LM3916,LM78LXX,IRF830,LM3915,HG93C56,LM3914,TL064C,MXA485,HG2981,HG2980,LM2954,HG93C46,HGC52XX,HG34C86,HG34C87,MAX13805,IIGV8555,MC34119,MC34118,LM2576-XX,IRF730,HG8137,CD4528,HG7169,IIGC8F 629,70N06,LM78MXX,CD4520,TLC2543,HG8138A,HG1734,HG1735,20N60,HG1185-XX,HG1851,IRF840,CD4518,HG1990,CD4517,HG1991,HG7179,LM1881,24C64,CD4511,LM2931-XX,HGL297,HGL298,HG93C66,HG1509,KA7500B,LF347,LM29302,HG1501,HG1621,HG75LBC184,HG75LBC182,CD4543,TL072C,TL084C,HG2803,HGL293,LF398,HG75LBC176,IRF740,3N80,CD4538,I.M78M05,CD4541,XC62GP-XX,24C32,20N50,MAX1487,4N60,MC1403,24C08,MAX202,TL074C,TL062C,TLC5615,HG1937,LM2575-XX,HG1932,24C02,24C01,24C04,HG7012,LM78L12,LM78L15,CD4562,HG809,LM29502,24C16,HG2571,HG2572,HG2573,HG3421,HG3420,11N90,12N60,ICL7660,93C06,HGC5219,LM2596-XX,HGC8F 887,TDA2030,75N75,HG8F676,HG8F675,LM4860,HG3423,HG1487,HG3422,LM3414,HG1583,LM1117,LM4862,LM4861,HG1580,LM4863,HGC8F 630,TL082C,CD4007,HG1208-XX,TDA2003,CD4013,CD4011,LM4990,LM4871,HG8F683,HG8F684,ULN2003,ULN2004,LM2574,LM2575,HGV8538,LM2576,HGV8535,HGV8536,HGV8534,HGV8531,MC34063,HGV8532,LM7905,LM809,CD4001,HG3526,HG3525,24C512,HG3524,LM35,LM7915,LM741,HGV8728,LM7912,HGV8968,HGV8726,HGV8966,CD4028,HG24C512,CD4027,HGV8965,CD4025,OP07,10N80,74HC540,74HC541,ICL7106,PCF8563,ICL7107,HG4824,HGV8052N,LM4890,HGC8F675,LM7805,LM7924,TD62083A,LM2596,CD4017,LM79LXX,HGC8F 684,CD4015,LM7809,LM7808,HGC8F 683,LM7806,CD4020,HGV2771N,CD4024,CD4023,CD4022,HG26C31,HG26C32,10N60,LM56,LM7815,HG56,ZNBG6000,LM7812,TD62084A,HG70XX,74HCU04,NE5532,CD4049,HGC8F 676,CD4053,CD4052,CD4051,93C66,CD4050,HG2623,HG2982,HG2985,HG2621,HG2622,UC3845,LM4558,HG24C64,74LVC1G04,UC3842,UC3843,UC3844,LM79MXX,7N60,TLC1543,IIGV8334,93C56,CD4040,IIGV8332,CD4046,74HC533,74HC534,LM4560

商品及供应商介绍 - 华冠半导体 - 2022/2/8 PDF 中文下载

HG74HC245 带三态控制的8 路总线收发器

型号- HG74HC245M/TR,HG74HC245MT/TR,74HC640,HG74HC245,HG74HC245N

数据手册 - 华冠半导体 - 2024-1-31 PDF 中文下载

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

商品及供应商介绍 - 华冠半导体 - 2022/6/14 PDF 中文下载

74HC245 带三态控制的 8 路总线收发器

型号- 74HC245,74HC245M/TR,74HC245MT/TR,74HC245N

数据手册 - 华冠半导体 - 2018 MAR PDF 中文下载查看更多版本

74HC245B 带三态控制的 8 路总线收发器

型号- 74HC245BMT/TR,74HC245BM/TR,74HC245BN,74HC245B

数据手册 - 华冠半导体 - 2024-1-31 PDF 中文下载查看更多版本

74HC245MT/TR PcbLib & SchLib & IntLib

型号- 74HC245MT/TR

CAD模型库 - 华冠半导体 - 2024-07-01 RAR 英文下载

【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。

产品发布时间 : 2022-09-05

【产品】华冠半导体推出的达林顿阵列功率驱动集成电路ULN2003A，输出电压高达50V，灌电流可达500mA

华冠半导体的ULN2003A是高耐压、大电流达林顿阵列，由七个硅NPN达林顿管组成。所有单元共用发射极，每个单元采用开集电极输出。为了提高输出效率，减小漏电，单元内部设计了镇流二极管以及适当的基—射极电阻。

产品发布时间 : 2022-10-19

富满电子（FM）LED显示屏系列驱动芯片选型指南

描述- 富满微电子集团股份有限公司创立于2001年，是一家致力于高性能模拟及数模混合集成电路设计研发、封装、测试、销售为一体的国家级高新技术企业及国家规划布局内重点集成电路设计企业、2017年7月5日在深交所创业板上市。

型号- FM6129,FM6869,74HC245TS,74HC04,FM7519,FM6353E,FM6565AL,TC6960,74HC595A.,FM6124,TC4953,FM6864,74HC138D,TC4973,FM6565AH,TC7559,FM6655A,74HC125,74HC245TB,74HC245TA,74HC245K,FM65128,74HC04D,74HC595E,TC7262,TC5020,74HC595D.,FM6373,TC6990,TC4983,FM6565D,74HC245KAJ,74HC138

选型指南 - 富满电子 - V1.92 - 2024/7/18 PDF 中文下载

华冠半导体比较器选型表

华冠半导体比较器，工作电压范围±1.5V~±18 V、2V-36V、1.4V-5.5V、1.6V-5.5V、±1.5V~±15V，失调电压700~3000uV，工作电流范围有0.046mA~2.4mA，输出类型Open-collector、Push-Pull，具有性能高，功耗低等特点，广泛应用于消费电子和工业领域。

产品型号	品类	工作结温（℃）	工作电流（mA）	存储温度（℃）	失调电压（uV）	工作电压（V）	封装
LM2901N	比较器	-40~85℃	1mA	-65~150℃	2000uV	±18V	DIP-14