74LS245
74LS245中文资料_数据手册_参数
74LS245
74LS245 三态输出的双向八组总线收发器
引出端符号：
A A总线端
B B总线端
/G 三态允许端(低电平有效)
DIR 方向控制端
74LS245是用来驱动LED或者其他的设备，它是8路同相三态双向总线收发器，可双向传输数据。
74LS245还具有双向三态功能，既可以输出，也可以输入数据。
如果用C51的P0口输出到数码管，那就要考虑到数码管的亮度以及P0口带负载的能力，当8051单片机的P0口总线负载达到或超过P0最大负载能力时，必须接入74LS245等总线驱动器。
选用74LS245提高驱动能力。
P0口的输出经过74LS245提高驱动后，输出到数码管显示电路。
工作原理：
当片选端/CE低电平有效时，
DIR=“0”，信号由B 向A 传输;（接收）
DIR=“1”，信号由A 向B 传输；（发送）
当CE为高电平时，A、B均为高阻态。
KK74LS245中文资料
TECHNICAL DATAKK 74LS245Octal 3-State Noninverting Bus TransceiverThese octal bus transceiver are designed for asynchronous two-way communication between data buses. The control function implementation minimized external timing requirements.The device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the directional control (DIR) input. The enable input(E) can be used to disable the device so that the buses are effectively isolated.• Bidirectional Bus Transceiver in a High-Density 20-Pin Package • 3-state Outputs Dirve Bus Lines Directly • P-N-P Inputs D-C Loading on Bus Lines• Hysteresis at Bus Inputs Improve Noise Margins• Typical Propagation Delay Times; Port to Port ... 8 nsPIN ASSIGNMENTLOGIC DIAGRAMPIN 20=V CC PIN 10 = GNDFUNCTION TABLEControl InputsOutput EnableDirection OperationL L Data Transmittedfrom Bus B to Bus A L H Data Transmittedfrom Bus A to Bus B H X Buses Isolated(High Impedance State) X = don’t careMAXIMUM RATINGS*Symbol Parameter ValueUnit V CC Supply Voltage 7.0 VV IN Input Voltage 7.0 VV OUT Output Voltage 5.5 VTstg Storage Temperature Range -65 to +150 °C*Maximum Ratings are those values beyond which damage to the device may occur.Functional operation should be restricted to the Recommended Operating Conditions.RECOMMENDED OPERATING CONDITIONSSymbol Parameter MinMaxUnit V CC Supply Voltage 4.75 5.25 VV IH High Level Input Voltage 2.0 VV IL Low Level Input Voltage 0.8 VI OH High Level Output Current -15 mAI OL Low Level Output Current 24 mAT A Ambient Temperature Range 0 +70 °CDC ELECTRICAL CHARACTERISTICS over full operating conditionsGuaranteedLimit Symbol Parameter TestConditions MinMaxUnit V IK Input Clamp Voltage V CC = min, I IN = -18 mA -1.5 VV OH High Level Output Voltage V CC = min, I OH = -1.0 mA 2.7 VV CC = min, I OH = -3.0 mA 2.4V CC = min, I OH = -15 mA 2.0V OL Low Level Output Voltage V CC = min, I OL = 12 mA 0.4 VV CC = min, I OL = 24 mA 0.5V T+ - V T-Hysteresis V CC = min 0.2 VI OZH Output Off Current HIGH V CC = max, V OUT = 2.7 V 20 µAI OZL Output Off Current LOW V CC = max, V OUT = 0.4 V -0.2 mAI IH High Level Input Current V CC = max, V IN = 2.7 V 20 µAV CC = max, V IN = 5.5 V (A or B) 0.1mAV CC = max, V IN = 7.0 Vfor Pin1, Pin 190.1I IL Low Level Input Current V CC = max, V IN = 0.4 V -0.2 mAI O Output Short Circuit Current V CC = max, V O =0 V(Note 1)-40 -225 mAI CC Supply OutputsHigh V CC = max 70 mA Current Outputs Low Outputs open 90All outputs disable 95Note 1: Not more thanone output should be shorted at a time, and duration of the short-circuit should not exceed one second.AC ELECTRICAL CHARACTERISTICS (T A = 25°C, V CC = 5.0 V, t r = 15 ns,,t f = 6.0 ns)Symbol Parameter TestConditionMinMaxUnitt PLH Propagation Delay Time, Low-to-High Level Output (from A or B to Output) 12nst PHL Propagation Delay Time, High-to-Low Level Output (from A or B to Output) C L = 45 pF,R L = 667 Ω12nst PZH Output Enable Time to High Level (from OE to Output) 40nst PZL Output Enable Time to Low Level (from OE to Output) 40nst PHZ Output Disable Time from High Level(from OE to Output) C L = 5 pF 25nst PLZ Output Disable Time from Low Level (from OE to Output) R L = 667 Ω 25nst PZL - S1 closed, S2 openedt PZH- S1 opened, S2 closedt PLZ, t PHZ - S1 and S2 closedFigure 1. Switching Waveforms(See Figure 3) Figure 2. Switching Waveforms(See Figure 4)NOTES A.C L includes probe and jig capacitance.B. All diodes are 1N916 or 1N3064.NOTES A.C L includes probe and jig capacitance.B. All diodes are 1N916 or 1N3064.Figure 3. Test Circuit Figure 4. Test CircuitEXPANDED LOGIC DIAGRAM。
单片机原理及接口技术课后习题第9章 答案
第九章复习思考题1. 计算机系统中为什么要设置输入输出接口输入/输出接口电路是CPU与外设进行数据传输的桥梁。
外设输入给CPU的数据，首先由外设传递到输入接口电路，再由CPU从接口获取；而CPU输出到外设的数据，先由CPU 输出到接口电路，然后与接口相接的外设获得数据。
CPU与外设之间的信息交换，实际上是与I/O接口电路之间的信息交换。
2. 简述输入输出接口的作用。
I/O接口电路的作用主要体现在以下几个方面：（1）实现单片机与外设之间的速度匹配；（2）实现输出数据锁存；（3）实现输入数据三态缓冲；（4）实现数据格式转换。
3. 在计算机系统中，CPU与输入输出接口之间传输数据的控制方式有哪几种各有什么特点在计算机系统中，CPU与I/O接口之间传输数据有3种控制方式：无条件方式，条件方式，中断方式，直接存储器存取方式。
在无条件方式下，只要CPU执行输入/输出指令，I/O接口就已经为数据交换做好了准备，也就是在输入数据时，外设传输的数据已经传送至输入接口，数据已经在输入接口端准备好；输出数据时，外设已经把上一次输出的数据取走，输出接口已经准备好接收新的数据。
条件控制方式也称为查询方式。
CPU进行数据传输时，先读接口的状态信息，根据状态信息判断接口是否准备好，如果没有准备就绪，CPU将继续查询接口状态，直到其准备好后才进行数据传输。
在中断控制方式下，当接口准备好数据传输时向CPU提出中断请求，如果满足中断响应条件，CPU则响应，这时CPU才暂时停止执行正在执行的程序，转去执行中断处理程序进行数据传输。
传输完数据后，返回原来的程序继续执行。
直接存储器存取方式即DMA方式，它由硬件完成数据交换，不需要CPU的介入，由DMA 控制器控制，使数据在存储器与外设之间直接传送。
4. 采用74LS273和74LS244为8051单片机扩展8路输入和8路输出接口，设外设8个按钮开关和8个LED，每个按钮控制1个LED，设计接口电路并编制检测控制程序。
HD74LS245P中文资料
Hitachi Code JEDEC EIAJWeight (reference value)DP-20N —Conforms 1.26 gUnit: mm元器件交易网Cautions1.Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,copyright, trademark, or other intellectual property rights for information contained in this document.Hitachi bears no responsibility for problems that may arise with third party’s rights, includingintellectual property rights, in connection with use of the information contained in this document.2.Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use.3.Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,contact Hitachi’s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,traffic, safety equipment or medical equipment for life support.4.Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installationconditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product.5.This product is not designed to be radiation resistant.6.No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi.7.Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor products.Hitachi, Ltd.Semiconductor & Integrated Circuits.Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.Hitachi Asia Pte. Ltd.16 Collyer Quay #20-00Hitachi TowerSingapore 049318Tel: 535-2100Fax: 535-1533URLNorthAmerica : http:/Europe : /hel/ecg Asia (Singapore): .sg/grp3/sicd/index.htm Asia (Taiwan): /E/Product/SICD_Frame.htm Asia (HongKong): /eng/bo/grp3/index.htm Japan : http://www.hitachi.co.jp/Sicd/indx.htmHitachi Asia Ltd.Taipei Branch Office3F, Hung Kuo Building. No.167, Tun-Hwa North Road, Taipei (105)Tel: <886> (2) 2718-3666Fax: <886> (2) 2718-8180Hitachi Asia (Hong Kong) Ltd.Group III (Electronic Components)7/F., North Tower, World Finance Centre,Harbour City, Canton Road, Tsim Sha Tsui,Kowloon, Hong Kong Tel: <852> (2) 735 9218Fax: <852> (2) 730 0281 Telex: 40815 HITEC HXHitachi Europe Ltd.Electronic Components Group.Whitebrook ParkLower Cookham Road MaidenheadBerkshire SL6 8YA, United Kingdom Tel: <44> (1628) 585000Fax: <44> (1628) 778322Hitachi Europe GmbHElectronic components Group Dornacher Stra§e 3D-85622 Feldkirchen, Munich GermanyTel: <49> (89) 9 9180-0Fax: <49> (89) 9 29 30 00Hitachi Semiconductor (America) Inc.179 East Tasman Drive,San Jose,CA 95134 Tel: <1> (408) 433-1990Fax: <1>(408) 433-0223For further information write to:。
74LS系列IC管脚图大全
74LS390 双十进制计数器
74LS624 压控振荡器
74LS625 压控振荡器
74LS626 压控振荡器
74LS627 压控振荡器
74LS628 压控振荡器
74LS629 压控振荡器
两片74LS283构成的8位加法器
74LS289 64位随机存取存储器
74LS289 64位随机存取存储器
74LS290异步2—5—10进制计数器
74LS290异步2—5—10进制计数器
74LS292 可编程分频器/数字定时器
74LS293 4位二进制计数器
74LS294 16位可编程模块
74LS374 八D触发器(三态同相)
74381
符号
A0 A1 A2 A3
B0 B1 B2 B3
C -1
S0 S1 S2
引脚排列
A 1 1 20 VCC
F0
B1
A2
F1
A0
B2
F2
B0
F3
S0
A3 B3
7 43 81
S1
C -1
S2
P
P
F0
G
G
F1
F3
GND 1 0 1 1 F 2
74LS381算术逻辑单元
74LS181 算术逻辑单元/功能发生器
74LS181 四位算术逻辑运算器
7 4 18 2
G 1 1 16 V cc
P1
P2
G0
G2
P0
C -1
G3
C0
P3
C1
P
G
G ND 8 9 C 2
74LS182先行进位发生器/超前进位产生器
VCC 2Ai 2Bi 2Ci-1 2Ci 2Si VCC2A 2B 2CIn 2COn+1 2F 74LS183 1COn+1 1A 1B 1CIn 1F GND 1Ai 1Bi 1Ci-1 1Ci 1Si 地
总线微控制实验
一、实验目的•理解总线的概念和作用。
•连接运算器与存储器，熟悉计算机的数据通路。
•理解微命令与微操作的概念。
二、实验内容•运行虚拟实验系统，组建实验电路。
•进行电路预设置。
•实施存储器的读写操作。
•进行8位算术逻辑运算。
•设计微命令并完成表格。
•记录和分析实验结果。
三、实验原理实验涉及的主要元器件包括：4位算术逻辑运算单元74LS181，8位数据锁存器74LS373，三态输出的总线收发器74LS245，2K×8静态随机存储器6116，时序发生器，开关、指示灯等。
通过这些元器件的组合，实现数据在总线上的传输和运算器、存储器之间的交互操作。
芯片介绍1.74LS245：8位双向缓冲传输门，用于总线和数据总线的连接。
2.74LS373：8位锁存器，用于数据的输入和控制信号处理。
3.M6116：2K×8位静态随机存储器，用于数据存储和读取。
四、实验步骤及结果（附数据和图表等）基本实验1. 运行虚拟实验系统从左边的实验设备列表选取所需组件拖到工作区中，按照图4.4所示组建实验电路。
2. 电路预设置1.将74LS373（U2,U3）的控制端LE置为0。
2.将74LS373（U7）的控制端LE置为0，OE置为1。
3.将74LS245（U9）的控制端CE置为1。
3. 打开电源开关4. 存储器写操作向01H，02H，03H存储单元分别写入十六进制数据37H、22H、66H。
具体操作步骤如下（以向01号单元写入37H为例）：1.将SW7~SW0置为00000001，CE(——)=0，打开三态门74LS245（U1），将地址送入BUS。
2.将74LS373（U7）的LE置1，OE(——)置0，将BUS上的地址存入AR（U7），可通过观察AR所连接的地址灯来查看地址。
3.将74LS373(U7)的LE置0,将地址锁存至M6116地址输入端；将CE(——)=1，关闭三态门74LS245（U1）。
4.将CE(——)=0，WE(——)=0，OE(——)=1，M6116写操作准备。
74ls245原理
74ls245原理
74LS245是一种双向总线缓冲器，用于将一个电路中的双向数据总线
与另一个电路中的双向数据总线相连接。
它有两个8位数据输入/输出端口（Port A和Port B），并且可以通过一个控制管脚（有时称为“使能”管脚）来选择数据流的方向。
在74LS245中，控制管脚（通常称为“使能”管脚）是“OE”，意
为“输出使能”。
当OE管脚为高电平（通常为Vcc）时，数据可以从端口A到端口B传输，而当OE管脚为低电平（通常为地）时，数据
可以从端口B到端口A传输。
该芯片中还有三个重要的管脚：DIR，A和B。
DIR管脚的状态决定了数据流的方向，当DIR管脚为高电平时，数据从端口A到端口B传输，当DIR管脚为低电平时，数据从端口B到端口A传输。
在使用时，DIR管脚通常与控制器中的某个输出位相连，以实现数据的控制。
在使用74LS245时，需要注意以下几点：
1. 端口A和端口B的电压级别必须相同（通常为TTL电平或CMOS
电平）。
2. 当数据从一个电路传输到另一个电路时，要确保电路之间的电气特性匹配，以避免信号失真。
3. 在数据传输期间，DIR管脚和OE管脚必须设置为正确的状态以实现正确的数据流。
总之，74LS245是一个方便实用的双向总线缓冲器，可以确保数据流动的可靠性和正确性。
在实际应用中，75LS245可以用于传输数据，例如在电子设备和自动控制系统中用于数据输入和输出。
用74LS245读入数据实验
用74LS245读入数据实验一、实验目的1、了解89C51常用端口与总线连接的方法2、掌握用74LS245进行数据读入 二、实验说明当P0口总线负载达到或超出P0最大负载能力8个TTL 门时，必须接入总线驱动器。
74LS245即是双向数据总线驱动芯片，具有双向三态功能，既可以输出也可以输入数据，本实验中用作输入口。
74LS245的引脚如图所示:74LS245是8路同相三态双向总线收发器，可双向传输数据,传输方向由DIR 决定,当片选端E 低电平有效时，DIR=0,信号由B 向A 传输；DIR=1,由A 向B 传输；当E 为高电平时，A 、B 均成高阻态。
三、实验内容及步骤把读入值送入内存地址30H 中。
本实验用到单片机最小系统（F1区）、拨码开关（C7区）和74LS245模块（G1区）。
1、选取用89C51单片机最小应用系统模块，按照原理图连接电路，DIR 、G 端与地相连，74LS245的A0-7接单片机最小系统的PO 口JD4F ，74LS245的B0-7口接拨码开关（C7区）JD5B 。
打开相关的电源，短路帽插到VCC 处。
2、用串行数据通信线连接计算机与仿真器，把仿真器插到模块的锁紧插座中，请注意仿真器的方向：缺口朝上。
3、打开Keil uVision2仿真软件，首先建立本实验的项目文件，接着添加“TH25_74LS245.ASM ”源程序，进行编译，直到编译无误。
4、全速运行程序。
打开数据窗口(DATA)，观察地址30H 的值，暂停程序。
再次观察30H 的值，是否已与拨码开关的值相同。
复位后，改变拨码开关输出，可再次运行程序，观察实验效果。
四、流程图及实验程序（见光盘中的程序文件夹）1、流程图 五、思考题试用74LS245输出数据。
六、电路图74LS245设置端口地址读入74LS245的值开始 结 束OE 19T/R 1A13B117A24B216A35B315A46B414A57B513A68B612A79B711A02B018VCC20GND10OE19T/R 1A13B117A24B216A35B315A46B414A57B513A68B612A79B711A02B018VCC20GND 10U1GSN74LS245N12345678JD2G B0-7VCCXTAL1A 12MHzC3A 33pFC2A 33pFP1.01P1.12P1.23P1.34P1.45P1.56P1.67P1.78RST 9P3.0/RXD 10P3.1/TXD 11P3.2/INT012P3.3/INT113P3.4/T014P3.5/T115P3.6/WR 16P3.7/RD 17XTAL218XTAL119VSS20P2.021P2.122P2.223P2.324P2.425P2.526P2.627P2.728PSEN 29ALE/PROG30EA31P0.032P0.133P0.234P0.335P0.436P0.537P0.638P0.739VCC 4089C51U1FVCC P3.0P3.1P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7P0.0P0.1P0.2P0.3P0.4P0.5P0.6P0.7EAALE PSEN P2.7P2.6P2.5P2.4P2.3P2.2P2.1P2.0P3.2P3.3P3.4P3.5P3.6P3.7C3F 10uFVCCRESETR2F 100R1F 1K。
74LS245实验报告
74LS245实验报告
班级姓名学号日期
一、实验目的：
1．了解CPU常用的端口连接总线的方法。
2．掌握用74LS245进行数据读入或输出。
二、实验要求
利用板上的集成电路插座，扩展一片74LS245，来读入开关状态。
三、实验说明
一般情况下，CPU 的总线会挂有很多器件，如何使这些器件不造成冲突，这就要使用一些总线隔离器件，例如74LS245就是一种。
74LS245是三态总线收发器，利用它既可以输出也可输入数据。
本实验 74LS245的片选地址为CSO，即8000H，读这个地址，就是从74LS245读回开关的值。
可以用单步的方式执行程序，改变开关状态，观察读回的值。
四、程序
五、实验过程中遇到的主要问题
六、实验后的心得体会。
74ls系列芯片功能和参数详细介绍
74ls系列芯⽚功能和参数详细介绍74、74HC、74LS系列芯⽚资料系列电平典型传输延迟ns 最⼤驱动电流(-Ioh/Lol)mAAHC CMOS 8.5 -8/8AHCT COMS/TTL 8.5 -8/8HC COMS 25 -8/8HCT COMS/TTL 25 -8/8ACT COMS/TTL 10 -24/24F TTL 6.5 -15/64ALS TTL 10 -15/64LS TTL 18 -15/24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。
7400 QUAD 2-INPUT NAND GATES 与⾮门7401 QUAD 2-INPUT NAND GATES OC 与⾮门7402 QUAD 2-INPUT NOR GATES 或⾮门7403 QUAD 2-INPUT NAND GATES 与⾮门7404 HEX INVERTING GATES 反向器7406 HEX INVERTING GATES HV ⾼输出反向器7408 QUAD 2-INPUT AND GATE 与门7409 QUAD 2-INPUT AND GATES OC 与门7410 TRIPLE 3-INPUT NAND GATES 与⾮门7411 TRIPLE 3-INPUT AND GATES 与门74121 ONE-SHOT WITH CLEAR 单稳态74132 SCHMITT TRIGGER NAND GATES 触发器与⾮门7414 SCHMITT TRIGGER INVERTERS 触发器反向器74153 4-LINE TO 1 LINE SELECTOR 四选⼀74155 2-LINE TO 4-LINE DECODER 译码器74180 PARITY GENERATOR/CHECKER 奇偶发⽣检验74191 4-BIT BINARY COUNTER UP/DOWN 计数器7420 DUAL 4-INPUT NAND GATES 双四输⼊与⾮门7426 QUAD 2-INPUT NAND GATES 与⾮门7427 TRIPLE 3-INPUT NOR GATES 三输⼊或⾮门7430 8-INPUT NAND GATES ⼋输⼊端与⾮门7432 QUAD 2-INPUT OR GATES ⼆输⼊或门7438 2-INPUT NAND GATE BUFFER 与⾮门缓冲器7445 BCD-DECIMAL DECODER/DRIVER BCD译码驱动器7474 D-TYPE FLIP-FLOP D型触发器7475 QUAD LATCHES 双锁存器7476 J-K FLIP-FLOP J-K触发器7485 4-BIT MAGNITUDE COMPARATOR 四位⽐较器7486 2-INPUT EXCLUSIVE OR GATES 双端异或门74HC00 QUAD 2-INPUT NAND GATES 双输⼊与⾮门74HC02 QUAD 2-INPUT NOR GATES 双输⼊或⾮门74HC03 2-INPUT OPEN-DRAIN NAND GATES 与⾮门74HC04 HEX INVERTERS 六路反向器74HC05 HEX INVERTERS OPEN DRAIN 六路反向器74HC08 2-INPUT AND GATES 双输⼊与门74HC107 J-K FLIP-FLOP WITH CLEAR J-K触发器74HC109A J-K FLIP-FLOP W/PRESET J-K触发器74HC11 TRIPLE 3-INPUT AND GATES 三输⼊与门74HC112 DUAL J-K FLIP-FLOP 双J-K触发器74HC113 DUAL J-K FLIP-FLOP PRESET 双JK触发器74HC123A RETRIGGERABLE MONOSTAB 可重触发单稳74HC125 TRI-STATE QUAD BUFFERS 四个三态门74HC126 TRI-STATE QUAD BUFFERS 六三态门74HC132 2-INPUT TRIGGER NAND 施密特触发与⾮门74HC133 13-INPUT NANDGATES ⼗三输⼊与⾮门74HC137 3-TO-8 DECODERS W/LATCHES 3-8线译码器74HC138 3-8 LINE DECODER 3线⾄8线译码器74HC139 2-4 LINE DECODER 2线⾄4线译码器74HC14 TRIGGERED HEX INVERTER 六触发反向器74HC147 10-4 LINE PRIORITY ENCODER 10-4编码器74HC148 8-3 LINE PRIORITY ENCODER 8-3编码器74HC149 8-8 LINE PRIORITY ENCODER 8-8编码器74HC151 8-CHANNEL DIGITAL MUX 8通道多路器74HC153 DUAL 4-INPUT MUX 双四输⼊多路器74HC154 4-16 LINE DECODER 4线⾄16线译码器74HC155 2-4 LINE DECODER 2线⾄4线译码器74HC157 QUAD 2-INPUT MUX 四个双端多路器74HC161 BINARY COUNTER ⼆进制计数器74HC163 DECADE COUNTERS ⼗进制计数器74HC164 SERIAL-PARALLEL SHIFT REG 串⼊并出74HC165 PARALLEL-SERIAL SHIFT REG 并⼊串出74HC166 SERIAL-PARALLEL SHIFT REG 串⼊并出74HC173 TRI-STATE D FLIP-FLOP 三态D触发器74HC174 HEX D FLIP-FLOP W/CLEAR 六D触发器74HC175 HEX D FLIP-FLOP W/CLEAR 六D触发器74HC181 ARITHMETIC LOGIC UNIT 算术逻辑单元74HC182 LOOK AHEAD CARRYGENERATR 进位发⽣器74HC190 BINARY UP/DN COUNTER ⼆进制加减计数器74HC191 DECADE UP/DN COUNTER ⼗进制加减计数器74HC192 DECADE UP/DN COUNTER ⼗进制加减计数器74HC193 BINARY UP/DN COUNTER ⼆进制加减计数器74HC194 4BIT BI-DIR SHIFT 4位双向移位寄存器74HC195 4BIT PARALLEL SHIFT 4位并⾏移位寄存器74HC20 QUAD 4-INPUT NAND GATE 四个四⼊与⾮门74HC221A NON-RETRIG MONOSTAB 不可重触发单稳74HC237 3-8 LINE DECODER 地址锁3线⾄8线译码器74HC242/243 TRI-STAT TRANSCEIVER 三态收发器74HC244 OCTAL 3-STATE BUFFER ⼋个三态缓冲门74HC245 OCTAL 3-STATE TRANSCEIVER 三态收发器74HC251 8-CH 3-STATE MUX 8路3态多路器74HC253 DUAL 4-CH 3-STATE MUX 4路3态多路器74HC257 QUAD 2-CH 3-STATE MUX 4路3态多路器74HC258 2-CH 3-STATE MUX 2路3态多路器74HC259 3-8 LINE DECODER 8位地址锁存译码器74HC266A 2-INPUT EXCLUSIVE NOR GATE 异或⾮74HC27 TRIPLE 3-INPUT NOR GATE三个3输⼊或⾮门74HC273 OCTAL D FLIP-FLOP CLEAR 8路D触发器74HC280 9BIT ODD/EVEN GENERATOR 奇偶发⽣器74HC283 4BIT BINARY ADDER CARRY 四位加法器74HC299 3-STATE UNIVERSAL SHIFT 三态移位寄存74HC30 8-INPUT NAND GATE 8输⼊端与⾮门74HC32 QUAD 2-INPUT OR GATE 四个双端或门74HC34 NON-INVERTER ⾮反向器74HC354 8-CH 3-STATE MUX 8路3态多路器74HC356 8-CH 3-STATE MUX 8路3态多路器74HC365 HEX 3-STATE BUFFER 六个三态缓冲门74HC366 3-STATE BUFFER INVERTER 缓冲反向器74HC367 3-STATE BUFFER INVERTER 缓冲反向器74HC368 3-STATE BUFFER INVERTER 缓冲反向器74HC373 3-STATE OCTAL D LATCHES 三态D型锁存器74HC374 3-STATE OCTAL D FLIPFLOP 三态D触发器74HC393 4-BIT BINARY COUNTER 4位⼆进制计数器74HC4016 QUAD ANALOG SWITCH 四路模拟量开关74HC4020 14-Stage Binary Counter 14输出计数器74HC4017 Decade Counter/Divider with 10 Decoded Outputs ⼗进制计数器带10个译码输出端74HC4040 12 Stage Binary Counter 12出计数器74HC4046 PHASE LOCK LOOP 相位监测输出器74HC4049 LEVEL DOWN CONVERTER 电平变低器74HC4050 LEVEL DOWN CONVERTER 电平变低器74HC4051 8-CH ANALOG MUX 8通道多路器74HC4052 4-CH ANALOG MUX 4通道多路器74HC4053 2-CH ANALOG MUX 2通道多路器74HC4060 14-STAGE BINARY COUNTER 14阶BIN计数74HC4066 QUAD ANALOG MUX 四通道多路器74HC4075 TRIPLE 3-INPUT OR GATE 3输⼊或门74HC42 BCD TO DECIMAL BCD转⼗进制译码器74HC423A RETRIGGERABLE MONOSTAB 可重触发单稳74HC4511 BCD-7 SEG DRIVER/DECODER 7段译码器74HC4514 4-16 LINE DECODER 4⾄16线译码器74HC4538A RETRIGGERAB MONOSTAB 可重触发单稳74HC4543 LCD BCD-7 SEG LCD⽤的BCD-7段译码驱动74HC51 AND OR GATE INVERTER 与或⾮门74HC521 8BIT MAGNITUDE COMPARATOR 判决定路74HC533 3-STATE D LATCH 三态D锁存器74HC534 3-STATE D FLIP-FLOP 三态D型触发器74HC540 3-STATE BUFFER 三态缓冲器74HC541 3-STATE BUFFER INVERTER三态缓冲反向器74HC58 DUAL AND OR GATE 与或门74HC589 3STATE 8BIT SHIFT 8位移位寄存三态输出74HC594 8BIT SHIFT REG 8位移位寄存器74HC595 8BIT SHIFT REG 8位移位寄存器出锁存74HC597 8BIT SHIFT REG 8位移位寄存器⼊锁存74HC620 3-STATE TRANSCEIVER 反向3态收发器74HC623 3-STATE TRANSCEIVER ⼋路三态收发器74HC640 3-STATE TRANSCEIVER 反向3态收发器74HC643 3-STATE TRANSCEIVER ⼋路三态收发器74HC646 NON-INVERT BUS TRANSCEIVER 总线收发器74HC648 INVERT BUS TRANCIVER 反向总线收发器74HC688 8BIT MAGNITUDE COMPARATOR 8位判决电路74HC7266 2-INPUT EXCLUSIVE NOR GATE 异或⾮门74HC73 DUAL J-K FLIP-FLOP W/CLEAR 双JK触发器74HC74A PRESET/CLEAR D FLIP-FLOP 双D触发器74HC75 4BIT BISTABLE LATCH 4位双稳锁存器74HC76 PRESET/CLEAR JK FLIP-FLOP 双JK触发器74HC85 4BIT MAGNITUDE COMPARATOR 4位判决电路74HC86 2INPUT EXCLUSIVE OR GATE 2输⼊异或门74HC942 BAUD MODEM 300BPS低速调制解调器74HC943 300 BAUD MODEM 300BPS低速调制解调器74LS00 QUAD 2-INPUT NAND GATES 与⾮门74LS02 QUAD 2-INPUT NOR GATES 或⾮门74LS03 QUAD 2-INPUT NAND GATES 与⾮门74LS04 HEX INVERTING GATES 反向器74LS05 HEX INVERTERS OPEN DRAIN 六路反向器74LS08 QUAD 2-INPUT AND GATE 与门74LS09 QUAD 2-INPUT AND GATES OC 与门74LS10 TRIPLE 3-INPUT NAND GATES 与⾮门74LS109 QUAD 2-INPUT AND GATES OC 与门74LS11 TRIPLE 3-INPUT AND GATES 与门74LS112 DUAL J-K FLIP-FLOP 双J-K触发器74LS113 DUAL J-K FLIP-FLOP PRESET 双JK触发器74LS114 NEGATIVE J-K FLIP-FLOP 负沿J-K触发器74LS122 Retriggerable Monostab 可重触发单稳74LS123 Retriggerable Monostable 可重触发单稳74LS125 TRI-STATE QUAD BUFFERS 四个三态门74LS13 QUAL 4-in NAND TRIGGER 4输⼊与⾮触发器74LS160 BCD DECADE 4BIT BIN COUNTERS 计数器74LS136 QUADRUPLE 2-INPUT XOR GATE 异或门74LS138 3-8 LINE DECODER 3线⾄8线译码器74LS139 2-4 LINE DECODER 2线⾄4线译码器74LS14 TRIGGERED HEX INVERTER 六触发反向器74HC147 10-4 LINE PRIORITY ENCODER 10-4编码器74HC148 8-3 LINE PRIORITY ENCODER 8-3编码器74HC149 8-8 LINE PRIORITY ENCODER 8-8编码器74LS151 8-CHANNEL DIGITAL MUX 8通道多路器74LS153 DUAL 4-INPUT MUX 双四输⼊多路器74LS155 2-4 LINE DECODER 2线⾄4线译码器74LS156 2-4 LINE DECODER/DEMUX 2-4译码器74LS157 QUAD 2-INPUT MUX 四个双端多路器74LS158 2-1 LINE MUX 2-1线多路器74LS160A BINARY COUNTER ⼆进制计数器74LS161A BINARY COUNTER ⼆进制计数器74LS162A BINARY COUNTER ⼆进制计数器74LS163A DECADE COUNTERS ⼗进制计数器74LS164 SERIAL-PARALLEL SHIFT REG 串⼊并出74LS168 BI-DIRECT BCD TO DECADE 双向计数器74LS1694BIT UP/DN BIN COUNTER 四位加减计数器74LS173 TRI-STATE D FLIP-FLOP 三态D触发器74LS174 HEX D FLIP-FLOP W/CLEAR 六D触发器74LS175 HEX D FLIP-FLOP W/CLEAR 六D触发器74LS190 BINARY UP/DN COUNTER ⼆进制加减计数器74LS191 DECADE UP/DN COUNTER ⼗进制加减计数器74LS192 DECADE UP/DN COUNTER ⼗进制加减计数器74LS193BINARY UP/DN COUNTER ⼆进制加减计数器74LS194A 4BIT BI-DIR SHIFT 4位双向移位寄存器74LS195A 4BIT PARALLEL SHIFT4位并⾏移位寄存器74LS20 QUAD 4-INPUT NAND GATE 四个四⼊与⾮门74LS21 4-INPUT AND GATE 四输⼊端与门74LS240 OCTAL 3-STATE BUFFER ⼋个三态缓冲门74LS244 OCTAL 3-STATE BUFFER ⼋个三态缓冲门74LS245 OCTAL 3-STATE TRANSCEIVER 三态收发器74LS253 DUAL 4-CH 3-STATE MUX 4路3态多路器74LS256 4BIT ADDRESS LATCH 四位可锁存锁存器74LS257 QUAD 2-CH 3-STATE MUX 4路3态多路器74LS258 2-CH 3-STATE MUX 2路3态多路器74LS27 TRIPLE 3-INPUT NOR GATES 三输⼊或⾮门74LS279 QUAD R-S LATCHES 四个RS⾮锁存器74LS28 QUAD 2-INPUT NOR BUFFER 四双端或⾮缓冲74LS283 4BIT BINARY ADDER CARRY 四位加法器74LS30 8-INPUT NAND GATES ⼋输⼊端与⾮门74LS32 QUAD 2-INPUT OR GATES ⼆输⼊或门74LS352 4-1 LINE SELECTOR/MUX 4-1线选择多路器74LS365 HEX 3-STATE BUFFER 六个三态缓冲门74LS367 3-STATE BUFFER INVERTER 缓冲反向器74LS368A 3-STATE BUFFER INVERTER 缓冲反向器74LS373 OCT LATCH W/3-STATE OUT三态输出锁存器74LS76 Dual JK Flip-Flop w/set 2个JK触发器74LS379 QUAD PARALLEL REG 四个并⾏寄存器74LS38 2-INPUT NAND GATE BUFFER 与⾮门缓冲器74LS390 DUAL DECADE COUNTER 2个10进制计数器74LS393 DUAL BINARY COUNTER 2个2进制计数器74LS42 BCD TO DECIMAL BCD转⼗进制译码器74LS48 BCD-7 SEG BCD-7段译码器74LS49 BCD-7 SEG BCD-7段译码器74LS51 AND OR GATE INVERTER 与或⾮门74LS540 OCT Buffer/Line Driver 8路缓冲驱动器74LS541 OCT Buffer/LineDriver 8路缓冲驱动器74LS74 D-TYPE FLIP-FLOP D型触发器74LS682 8BIT MAGNITUDE COMPARATOR 8路⽐较器74LS684 8BIT MAGNITUDE COMPARATOR 8路⽐较器74LS75 QUAD LATCHES 双锁存器74LS83A 4BIT BINARY ADDER CARRY 四位加法器74LS85 4BIT MAGNITUDE COMPARAT 4位判决电路74LS86 2INPUT EXCLUSIVE OR GATE 2输⼊异或门74LS90 DECADE/BINARY COUNTER ⼗/⼆进制计数器74LS95B4BIT RIGHT/LEFT SHIFT 4位左右移位寄存74LS688 8BIT MAGNITUDE COMPARAT 8位判决电路74LS136 2-INPUT XOR GATE 2输⼊异或门74LS651 BUS TRANSCEIVERS 总线收发器74LS653 BUS TRANSCEIVERS 总线收发器74LS670 3-STATE 4-BY-4 REG 3态4-4寄存器74LS73A DUAL J-K FLIP-FLOP W/CLEAR 双JK触发器。
74245中文资料
© 2000 Fairchild Semiconductor Corporation DS006413August 1986Revised March 2000DM74LS245 3-STATE Octal Bus TransceiverDM74LS2453-STATE Octal Bus TransceiverGeneral DescriptionThese octal bus transceivers are designed for asynchro-nous two-way communication between data buses. The control function implementation minimizes external timing requirements.The device allows data transmission from the A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control (DIR) input. The enable input (G) can be used to disable the device so that the buses are effectively isolated.Featuress Bi-Directional bus transceiver in a high-density 20-pin package s 3-STATE outputs drive bus lines directly s PNP inputs reduce DC loading on bus lines s Hysteresis at bus inputs improve noise margins s Typical propagation delay times, port-to-port 8 ns s Typical enable/disable times 17 ns s I OL (sink current)24 mAs I OH (source current)−15 mAOrdering Code:Devices also available in T ape and Reel. Specify by appending the suffix letter “X” to the ordering code.Connection Diagram Function TableH = HIGH Level L = LOW Level X = IrrelevantOrder Number Package NumberPackage DescriptionDM74LS245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74LS245NN20A20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 WideEnable Direction OperationG Control DIR L L B Data to A Bus L H A Data to B BusHXIsolation 2D M 74L S 245Absolute Maximum Ratings (Note 1)Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings.The “Recommended Operating Conditions” table will define the conditions for actual device operation.Recommended Operating ConditionsElectrical Characteristicsover recommended operating free air temperature range (unless otherwise noted)Note 2: All typicals are at V CC = 5V, T A = 25°C.Note 3: Not more than one output should be shorted at a time, not to exceed one second durationSupply Voltage 7VInput VoltageDIR or G 7V A or B5.5VOperating Free Air Temperature Range 0°C to +70°C Storage Temperature Range−65°C to +150°CSymbol ParameterMin Nom Max Units V CC Supply Voltage4.7555.25V V IH HIGH Level Input Voltage 2V V IL LOW Level Input Voltage 0.8V I OH HIGH Level Output Current −15mA I OL LOW Level Output Current 24mA T AFree Air Operating Temperature70°CSymbol ParameterConditions MinTyp Max Units (Note 2)V I Input Clamp Voltage V CC = Min, I I = −18 mA −1.5V HYS Hysteresis (V T + − V T −)V CC = Min0.20.4VV OHHIGH Level V CC = Min, V IH = Min 2.7Output VoltageV IL = Max, I OH = −1 mA V CC = Min, V IL = Min 2.4 3.4VV IL = Max, I OH = −3 mA V CC = Min, V IH = Min 2V IL = 0.5V, I OH = MaxV OLLOW Level V CC = Min I OL = 12 mA 0.4Output VoltageV IL = Max I OL = Max 0.5VV IH = Min I OZH Off-State Output Current,V CC = Max V O = 2.7V 20µA HIGH Level Voltage Applied V IL = Max I OZL Off-State Output Current,V IH = Min V O = 0.4V −200µA LOW Level Voltage Applied I I Input Current at Maximum V CC = MaxA orB V I = 5.5V 0.1mA Input VoltageDIR or GV I = 7V0.1I IH HIGH Level Input Current V CC = Max, V I = 2.7V 20µA I IL LOW Level Input Current V CC = Max, V I = 0.4V −0.2mA I OS Short Circuit Output Current V CC = Max (Note 3)−40−225mAI CCSupply CurrentOutputs HIGH V CC = Max4870Outputs LOW 6290mA Outputs at Hi-Z6495DM74LS245 Switching CharacteristicsV CC= 5V, T A= 25°CSymbol Parameter Conditions Min Max Unitst PLH Propagation Delay Time,C L= 45 pF12ns LOW-to-HIGH Level Output R L= 667Ωt PHL Propagation Delay Time,12ns HIGH-to-LOW Level Outputt PZL Output Enable Time40ns to LOW Levelt PZH Output Enable Time40ns to HIGH Levelt PLZ Output Disable Time C L= 5 pF25ns from LOW Level R L= 667Ωt PHZ Output Disable Time25ns from HIGH Levelt PLH Propagation Delay Time, C L= 150 pF16ns LOW-to-HIGH Level Output R L= 667Ωt PHL Propagation Delay Time,17ns HIGH-to-LOW Level Outputt PZL Output Enable Time45ns to LOW Levelt PZH Output Enable Time45ns to HIGH Level 4D M 74L S 245Physical Dimensionsinches (millimeters) unless otherwise noted20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 WidePackage Number M20B DM74LS245Physical Dimensions inches (millimeters) unless otherwise noted (Continued)20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm WidePackage Number M20D6D M 74L S 245 3-S T A TE O c t a l B u s T r a n s c e i v e rPhysical Dimensions inches (millimeters) unless otherwise noted (Continued)20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 WidePackage Number N20AFairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.LIFE SUPPORT POLICYFAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:1.Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea-sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea-sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.。
单片机原理及接口技术课后习题第9章答案
第九章复习思考题1. 计算机系统中为什么要设置输入输出接口？输入/输出接口电路是CPU与外设进行数据传输的桥梁。
外设输入给CPU的数据，首先由外设传递到输入接口电路，再由CPU从接口获取；而CPU输出到外设的数据，先由CPU 输出到接口电路，然后与接口相接的外设获得数据。
CPU与外设之间的信息交换，实际上是与I/O接口电路之间的信息交换。
2. 简述输入输出接口的作用。
I/O接口电路的作用主要表达在以下几个方面：〔1〕实现单片机与外设之间的速度匹配；〔2〕实现输出数据锁存；〔3〕实现输入数据三态缓冲；〔4〕实现数据格式转换。
3. 在计算机系统中，CPU与输入输出接口之间传输数据的控制方式有哪几种？各有什么特点？在计算机系统中，CPU与I/O接口之间传输数据有3种控制方式：无条件方式，条件方式，中断方式，直接存储器存取方式。
在无条件方式下，只要CPU执行输入/输出指令，I/O接口就已经为数据交换做好了准备，也就是在输入数据时，外设传输的数据已经传送至输入接口，数据已经在输入接口端准备好；输出数据时，外设已经把上一次输出的数据取走，输出接口已经准备好接收新的数据。
条件控制方式也称为查询方式。
CPU进行数据传输时，先读接口的状态信息，根据状态信息判断接口是否准备好，如果没有准备就绪，CPU将继续查询接口状态，直到其准备好后才进行数据传输。
在中断控制方式下，当接口准备好数据传输时向CPU提出中断请求，如果满足中断响应条件，CPU那么响应，这时CPU才暂时停止执行正在执行的程序，转去执行中断处理程序进行数据传输。
传输完数据后，返回原来的程序继续执行。
直接存储器存取方式即DMA方式，它由硬件完成数据交换，不需要CPU的介入，由DMA 控制器控制，使数据在存储器与外设之间直接传送。
4. 采用74LS273和74LS244为8051单片机扩展8路输入和8路输出接口，设外设8个按钮开关和8个LED，每个按钮控制1个LED，设计接口电路并编制检测控制程序。
74LS245中文资料
LOW POWER SCHOTTKYDevice Package Shipping SN74LS245N 16 Pin DIP 1440 Units/Box SN74LS245DW16 PinSOIC DW SUFFIX CASE 751D2500/T ape & ReelPLASTIC N SUFFIX CASE 738201201ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATIONASIA/PACIFIC: LDC for ON Semiconductor – Asia SupportPhone:303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time)Toll Free from Hong Kong 800–4422–3781Email: ONlit–asia@JAPAN: ON Semiconductor, Japan Customer Focus Center4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–8549Phone: 81–3–5487–8345Email: r14153@Fax Response Line:303–675–2167。
74LS245中文资料
A 总线端 B 总线端 三态允许端(低电平有效) 方向控制端
双列直插封装
极限值: 电源电压 …………………………………………. 输入电压 …………………………………………. 输出高阻态时高电平电压 …………………………. 工作环境温度
54LS245 ………………………………….
74LS245 …………………………………. 存储温度 ………………………………………….
7V 7V 5.5V
-55~125℃ 0~70℃ -65~150℃
ｗｗｗ．ｅｌｅｃｆａｎｓ．ｃｏｍ
ＩＣ资料查询网站：
电子工程技术论坛：
功能表:
推荐工作条件:
电源电压 Vcc
54 74
输入高电平电ViH
输入低电平电ViL
54 74
输出高电平电流 54
IOH
74
输出低电平电流 54
IOL
74
动态特性(TA=25℃)
[1]: 测试条件中的“最小”和“最大”用推荐工作条件中的相应值。
ｗｗｗ．ｅｌｅｃｆａｎｓ．ｃｏｍ
测试条件
Vcc =5V CL=45pF RL=667 Ω
Vcc=5V CL=5pF RL=90 Ω
静态特性（TA 为工作环境温度范围）
LS245 最大
12 12 40 40 25 25
单位
ns ns ns ns ns ns
参数
VIK输入嵌位电压 △VT滞后电压
VOH输出高电平电压
测 试 条 件【1】
Vcc＝最大
Vcc＝最大，VIH=2V VIL=最大，VO=2.7V Vcc＝最大，VIH=2V,VIL＝最大
，VO=0.4V
所有输出均为高电平
Vcc＝ 最大
74ls系列中文资料功能介绍
74ls293 4位二进制计数器
74ls294 16位可编程模
74ls295 四位双向通用移位寄存器
74ls298 四-2输入多路转换器(带选通)
74ls299 八位通用移位寄存器(三态输出)
74ls348 8-3线优先编码器(三态输出)
74ls352 双四选1数据选择器/多路转换器
74ls40 4输入双与非缓冲器
74ls41 bcd-十进制计数器
74ls42 4线-10线译码器(bcd输入)
74ls43 4线-10线译码器(余3码输入)
74ls44 4线-10线译码器(余3葛莱码输入)
74ls45 bcd-十进制译码器/驱动器
74ls46 bcd-七段译码器/驱动器
74ls353 双4-1线数据选择器(三态输出)
74ls354 8输入端多路转换器/数据选择器/寄存器,三态补码输出
74ls355 8输入端多路转换器/数据选择器/寄存器,三态补码输出
74ls356 8输入端多路转换器/数据选择器/寄存器,三态补码输出
74ls357 8输入端多路转换器/数据位移位寄存器
74ls210 2-5-10进制计数器
74ls213 2-n-10可变进制计数器
74ls221 双单稳触发器
74ls230 八3态总线驱动器
74ls231 八3态总线反向驱动器
74ls240 八缓冲器/线驱动器/线接收器(反码三态输出)
74ls241 八缓冲器/线驱动器/线接收器(原码三态输出)
74ls260 双5输入或非门
74ls261 4*2并行二进制乘法器
74ls265 四互补输出元件
SN74LS245
PACKAGING INFORMATIONOrderable Device Status (1)Package Type PackageDrawing Pins Package Qty Eco Plan (2)Lead/Ball FinishMSL Peak Temp (3)Samples(Requires Login)5962-8002101VRA ACTIVE CDIP J2020TBD A42N / A for Pkg Type 5962-8002101VSA ACTIVE CFP W201TBD Call TI N / A for Pkg Type 80021012A ACTIVE LCCC FK201TBD Call TI Call TI8002101SA ACTIVE CFP W201TBD Call TI Call TIJM38510/32803B2A ACTIVE LCCC FK201TBD POST-PLATE N / A for Pkg Type JM38510/32803BRA ACTIVE CDIP J201TBD A42N / A for Pkg Type JM38510/32803BSA ACTIVE CFP W201TBD Call TI N / A for Pkg TypeM38510/32803B2A ACTIVE LCCC FK201TBD POST-PLATE N / A for Pkg TypeM38510/32803BRA ACTIVE CDIP J201TBD A42N / A for Pkg TypeM38510/32803BSA ACTIVE CFP W201TBD Call TI N / A for Pkg Type SN54LS245J ACTIVE CDIP J201TBD A42N / A for Pkg Type SN74LS245DBR ACTIVE SSOP DB202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMSN74LS245DBRE4ACTIVE SSOP DB202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMSN74LS245DBRG4ACTIVE SSOP DB202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMSN74LS245DW ACTIVE SOIC DW2025Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMSN74LS245DWG4ACTIVE SOIC DW2025Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMSN74LS245DWR ACTIVE SOIC DW202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMSN74LS245DWRG4ACTIVE SOIC DW202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM SN74LS245J OBSOLETE CDIP J20TBD Call TI Call TISN74LS245N ACTIVE PDIP N2020Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type SN74LS245N3OBSOLETE PDIP N20TBD Call TI Call TISN74LS245NE4ACTIVE PDIP N2020Pb-Free (RoHS)CU NIPDAU N / A for Pkg Type SN74LS245NSR ACTIVE SO NS202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMAddendum-Page 1Orderable Device Status (1)Package Type PackageDrawing Pins Package Qty Eco Plan (2)Lead/Ball FinishMSL Peak Temp (3)Samples(Requires Login)SN74LS245NSRE4ACTIVE SO NS202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIMSN74LS245NSRG4ACTIVE SO NS202000Green (RoHS& no Sb/Br)CU NIPDAU Level-1-260C-UNLIM SNJ54LS245FK ACTIVE LCCC FK201TBD POST-PLATE N / A for Pkg TypeSNJ54LS245J ACTIVE CDIP J201TBD A42N / A for Pkg TypeSNJ54LS245W ACTIVE CFP W201TBD Call TI N / A for Pkg Type(1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check /productcontent for the latest availability information and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.OTHER QUALIFIED VERSIONS OF SN54LS245, SN54LS245-SP, SN74LS245 :•Catalog: SN74LS245, SN54LS245Addendum-Page 2•Military: SN54LS245•Space: SN54LS245-SPNOTE: Qualified Version Definitions:•Catalog - TI's standard catalog product•Military - QML certified for Military and Defense Applications•Space - Radiation tolerant, ceramic packaging and qualified for use in Space-based applicationAddendum-Page 3TAPE AND REEL INFORMATION*All dimensions are nominalDevicePackage Type Package Drawing Pins SPQReel Diameter (mm)Reel Width W1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W (mm)Pin1Quadrant SN74LS245DBR SSOP DB 202000330.016.48.27.5 2.512.016.0Q1SN74LS245DWR SOIC DW 202000330.024.410.813.0 2.712.024.0Q1SN74LS245NSRSONS202000330.024.48.213.02.512.024.0Q1*All dimensions are nominalDevice Package Type Package Drawing Pins SPQ Length(mm)Width(mm)Height(mm) SN74LS245DBR SSOP DB202000367.0367.038.0 SN74LS245DWR SOIC DW202000367.0367.045.0SN74LS245NSR SO NS202000367.0367.045.0IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries(TI)reserve the right to make corrections,enhancements,improvements and other changes to its semiconductor products and services per JESD46,latest issue,and to discontinue any product or service per JESD48,latest issue.Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.All semiconductor products(also referred to herein as“components”)are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its components to the specifications applicable at the time of sale,in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products.Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty.Except where mandated by applicable law,testing of all parameters of each component is not necessarily performed.TI assumes no liability for applications assistance or the design of Buyers’products.Buyers are responsible for their products and applications using TI components.To minimize the risks associated with Buyers’products and applications,Buyers should provide adequate design and operating safeguards.TI does not warrant or represent that any license,either express or implied,is granted under any patent right,copyright,mask work right,or other intellectual property right relating to any combination,machine,or process in which TI components or services are rmation published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or endorsement e of such information may require a license from a third party under the patents or other intellectual property of the third party,or a license from TI under the patents or other intellectual property of TI.Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties,conditions,limitations,and notices.TI is not responsible or liable for such altered rmation of third parties may be subject to additional restrictions.Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.Buyer acknowledges and agrees that it is solely responsible for compliance with all legal,regulatory and safety-related requirements concerning its products,and any use of TI components in its applications,notwithstanding any applications-related information or support that may be provided by TI.Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures,monitor failures and their consequences,lessen the likelihood of failures that might cause harm and take appropriate remedial actions.Buyer will fully indemnify TI and its representatives against any damages arising out of the use of any TI components in safety-critical applications.In some cases,TI components may be promoted specifically to facilitate safety-related applications.With such components,TI’s goal is to help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and requirements.Nonetheless,such components are subject to these terms.No TI components are authorized for use in FDA Class III(or similar life-critical medical equipment)unless authorized officers of the parties have executed a special agreement specifically governing such use.Only those TI components which TI has specifically designated as military grade or“enhanced plastic”are designed and intended for use in military/aerospace applications or environments.Buyer acknowledges and agrees that any military or aerospace use of TI components which have not been so designated is solely at the Buyer's risk,and that Buyer is solely responsible for compliance with all legal and regulatory requirements in connection with such use.TI has specifically designated certain components which meet ISO/TS16949requirements,mainly for automotive ponents which have not been so designated are neither designed nor intended for automotive use;and TI will not be responsible for any failure of such components to meet such requirements.Products ApplicationsAudio /audio Automotive and Transportation /automotiveAmplifiers Communications and Telecom /communicationsData Converters Computers and Peripherals /computersDLP®Products Consumer Electronics /consumer-appsDSP Energy and Lighting /energyClocks and Timers /clocks Industrial /industrialInterface Medical /medicalLogic Security /securityPower Mgmt Space,Avionics and Defense /space-avionics-defense Microcontrollers Video and Imaging /videoRFID OMAP Applications Processors /omap TI E2E Community Wireless Connectivity /wirelessconnectivityMailing Address:Texas Instruments,Post Office Box655303,Dallas,Texas75265Copyright©2012,Texas Instruments Incorporated。
74LS系列数字集成电路型号及功能表
74LS系列数字集成电路型号及功能表74LS系列数字集成电路型号及功能表74ls00 2输入四与非门74ls01 2输入四与非门 (oc)74ls02 2输入四或非门74ls03 2输入四与非门 (oc)74ls04 六倒相器74ls05 六倒相器(oc)74ls06 六高压输出反相缓冲器/驱动器(oc,30v)74ls07 六高压输出缓冲器/驱动器(oc,30v)74ls08 2输入四与门74ls09 2输入四与门(oc)74ls10 3输入三与非门74ls11 3输入三与门74ls12 3输入三与非门 (oc)74ls13 4输入双与非门 (斯密特触发)74ls14 六倒相器(斯密特触发)74ls15 3输入三与门 (oc)74ls16 六高压输出反相缓冲器/驱动器(oc,15v)74ls17 六高压输出缓冲器/驱动器(oc,15v)74ls18 4输入双与非门 (斯密特触发)74ls19 六倒相器(斯密特触发)74ls20 4输入双与非门74ls21 4输入双与门74ls22 4输入双与非门(oc)74ls23 双可扩展的输入或非门74ls24 2输入四与非门(斯密特触发)74ls25 4输入双或非门(有选通)74ls26 2输入四高电平接口与非缓冲器(oc,15v)74ls27 3输入三或非门74ls28 2输入四或非缓冲器74ls30 8输入与非门74ls31 延迟电路74ls32 2输入四或门74ls33 2输入四或非缓冲器(集电极开路输出)74ls34 六缓冲器74ls35 六缓冲器(oc)74ls36 2输入四或非门(有选通)74ls37 2输入四与非缓冲器74ls38 2输入四或非缓冲器(集电极开路输出)74ls39 2输入四或非缓冲器(集电极开路输出)74ls40 4输入双与非缓冲器74ls41 bcd-十进制计数器74ls42 4线-10线译码器(bcd输入)74ls43 4线-10线译码器(余3码输入)74ls44 4线-10线译码器(余3葛莱码输入)74ls45 bcd-十进制译码器/驱动器74ls46 bcd-七段译码器/驱动器74ls47 bcd-七段译码器/驱动器74ls48 bcd-七段译码器/驱动器74ls49 bcd-七段译码器/驱动器(oc)74ls50 双二路2-2输入与或非门(一门可扩展)74ls51 双二路2-2输入与或非门74ls51 二路3-3输入,二路2-2输入与或非门74ls52 四路2-3-2-2输入与或门(可扩展)74ls53 四路2-2-2-2输入与或非门(可扩展)74ls53 四路2-2-3-2输入与或非门(可扩展)74ls54 四路2-2-2-2输入与或非门74ls54 四路2-3-3-2输入与或非门74ls54 四路2-2-3-2输入与或非门74ls55 二路4-4输入与或非门(可扩展)74ls60 双四输入与扩展74ls61 三3输入与扩展74ls62 四路2-3-3-2输入与或扩展器74ls63 六电流读出接口门74ls64 四路4-2-3-2输入与或非门74ls65 四路4-2-3-2输入与或非门(oc)74ls70 与门输入上升沿jk触发器74ls71 与输入r-s主从触发器74ls72 与门输入主从jk触发器74ls73 双j-k触发器(带清除端)74ls74 正沿触发双d型触发器(带预置端和清除端)74ls75 4位双稳锁存器74ls76 双j-k触发器(带预置端和清除端)74ls77 4位双稳态锁存器74ls78 双j-k触发器(带预置端,公共清除端和公共时钟端) 74ls80 门控全加器74ls81 16位随机存取存储器74ls82 2位二进制全加器(快速进位)74ls83 4位二进制全加器(快速进位)74ls84 16位随机存取存储器74ls85 4位数字比较器74ls86 2输入四异或门74ls87 四位二进制原码/反码/oi单元74ls89 64位读/写存储器74ls90 十进制计数器74ls91 八位移位寄存器74ls92 12分频计数器(2分频和6分频)74ls93 4位二进制计数器74ls94 4位移位寄存器(异步)74ls95 4位移位寄存器(并行io)74ls96 5位移位寄存器74ls97 六位同步二进制比率乘法器74ls100 八位双稳锁存器74ls103 负沿触发双j-k主从触发器(带清除端)74ls106 负沿触发双j-k主从触发器(带预置,清除,时钟) 74ls107 双j-k主从触发器(带清除端)74ls108 双j-k主从触发器(带预置,清除,时钟)74ls109 双j-k触发器(带置位,清除,正触发)74ls110 与门输入j-k主从触发器(带锁定)74ls111 双j-k主从触发器(带数据锁定)74ls112 负沿触发双j-k触发器(带预置端和清除端)74ls113 负沿触发双j-k触发器(带预置端)74ls114 双j-k触发器(带预置端,共清除端和时钟端)74ls116 双四位锁存器74ls120 双脉冲同步器/驱动器74ls121 单稳态触发器(施密特触发)74ls122 可再触发单稳态多谐振荡器(带清除端)74ls123 可再触发双单稳多谐振荡器74ls125 四总线缓冲门(三态输出)74ls126 四总线缓冲门(三态输出)74ls128 2输入四或非线驱动器74ls131 3-8译码器74ls132 2输入四与非门(斯密特触发)74ls133 13输入端与非门74ls134 12输入端与门(三态输出)74ls135 四异或/异或非门74ls136 2输入四异或门(oc)74ls137 八选1锁存译码器/多路转换器74ls138 3-8线译码器/多路转换器74ls139 双2-4线译码器/多路转换器74ls140 双4输入与非线驱动器74ls141 bcd-十进制译码器/驱动器74ls142 计数器/锁存器/译码器/驱动器74ls145 4-10译码器/驱动器74ls147 10线-4线优先编码器74ls148 8线-3线八进制优先编码器74ls150 16选1数据选择器(反补输出)74ls151 8选1数据选择器(互补输出)74ls152 8选1数据选择器多路开关74ls153 双4选1数据选择器/多路选择器74ls154 4线-16线译码器74ls155 双2-4译码器/分配器(图腾柱输出)74ls156 双2-4译码器/分配器(集电极开路输出) 74ls157 四2选1数据选择器/多路选择器74ls158 四2选1数据选择器(反相输出)74ls160 可预置bcd计数器(异步清除)74ls161 可预置四位二进制计数器(并清除异步) 74ls162 可预置bcd计数器(异步清除)74ls163 可预置四位二进制计数器(并清除异步) 74ls164 8位并行输出串行移位寄存器74ls165 并行输入8位移位寄存器(补码输出)74ls166 8位移位寄存器74ls167 同步十进制比率乘法器74ls168 4位加/减同步计数器(十进制)74ls169 同步二进制可逆计数器74ls170 4*4寄存器堆74ls171 四d触发器(带清除端)74ls172 16位寄存器堆74ls173 4位d型寄存器(带清除端)74ls174 六d触发器74ls175 四d触发器74ls176 十进制可预置计数器74ls177 2-8-16进制可预置计数器74ls178 四位通用移位寄存器74ls179 四位通用移位寄存器74ls180 九位奇偶产生/校验器74ls181 算术逻辑单元/功能发生器74ls182 先行进位发生器74ls183 双保留进位全加器74ls184 bcd-二进制转换器74ls185 二进制-bcd转换器74ls190 同步可逆计数器(bcd,二进制)74ls191 同步可逆计数器(bcd,二进制)74ls192 同步可逆计数器(bcd,二进制)74ls193 同步可逆计数器(bcd,二进制)74ls194 四位双向通用移位寄存器74ls195 四位通用移位寄存器74ls196 可预置计数器/锁存器74ls197 可预置计数器/锁存器(二进制)74ls198 八位双向移位寄存器74ls199 八位移位寄存器74ls210 2-5-10进制计数器74ls213 2-n-10可变进制计数器74ls221 双单稳触发器74ls230 八3态总线驱动器74ls231 八3态总线反向驱动器74ls240 八缓冲器/线驱动器/线接收器(反码三态输出) 74ls241 八缓冲器/线驱动器/线接收器(原码三态输出) 74ls242 八缓冲器/线驱动器/线接收器74ls243 4同相三态总线收发器74ls244 八缓冲器/线驱动器/线接收器74ls245 八双向总线收发器74ls246 4线-七段译码/驱动器(30v)74ls247 4线-七段译码/驱动器(15v)74ls248 4线-七段译码/驱动器74ls249 4线-七段译码/驱动器74ls251 8选1数据选择器(三态输出)74ls253 双四选1数据选择器(三态输出)74ls256 双四位可寻址锁存器74ls257 四2选1数据选择器(三态输出)74ls258 四2选1数据选择器(反码三态输出)74ls259 8为可寻址锁存器74ls260 双5输入或非门74ls261 4*2并行二进制乘法器74ls265 四互补输出元件74ls266 2输入四异或非门(oc)74ls270 2048位rom (512位四字节,oc)74ls271 2048位rom (256位八字节,oc)74ls273 八d触发器74ls274 4*4并行二进制乘法器74ls275 七位片式华莱士树乘法器74ls276 四jk触发器74ls278 四位可级联优先寄存器74ls279 四s-r锁存器74ls280 9位奇数/偶数奇偶发生器/较验器74ls28174ls283 4位二进制全加器74ls290 十进制计数器74ls291 32位可编程模74ls293 4位二进制计数器74ls294 16位可编程模74ls295 四位双向通用移位寄存器74ls298 四-2输入多路转换器(带选通)74ls299 八位通用移位寄存器(三态输出)74ls348 8-3线优先编码器(三态输出)74ls352 双四选1数据选择器/多路转换器74ls353 双4-1线数据选择器(三态输出)74ls354 8输入端多路转换器/数据选择器/寄存器,三态补码输出74ls355 8输入端多路转换器/数据选择器/寄存器,三态补码输出74ls356 8输入端多路转换器/数据选择器/寄存器,三态补码输出74ls357 8输入端多路转换器/数据选择器/寄存器,三态补码输出74ls365 6总线驱动器74ls366 六反向三态缓冲器/线驱动器74ls367 六同向三态缓冲器/线驱动器74ls368 六反向三态缓冲器/线驱动器74ls373 八d锁存器74ls374 八d触发器(三态同相)74ls375 4位双稳态锁存器74ls377 带使能的八d触发器74ls378 六d触发器74ls379 四d触发器74ls381 算术逻辑单元/函数发生器74ls382 算术逻辑单元/函数发生器74ls384 8位*1位补码乘法器74ls385 四串行加法器/乘法器74ls386 2输入四异或门74ls390 双十进制计数器74ls391 双四位二进制计数器74ls395 4位通用移位寄存器74ls396 八位存储寄存器74ls398 四2输入端多路开关(双路输出)74ls399 四-2输入多路转换器(带选通)74ls422 单稳态触发器74ls423 双单稳态触发器74ls440 四3方向总线收发器,集电极开路74ls441 四3方向总线收发器,集电极开路74ls442 四3方向总线收发器,三态输出74ls443 四3方向总线收发器,三态输出74ls444 四3方向总线收发器,三态输出74ls445 bcd-十进制译码器/驱动器,三态输出74ls446 有方向控制的双总线收发器74ls448 四3方向总线收发器,三态输出74ls449 有方向控制的双总线收发器74ls465 八三态线缓冲器74ls466 八三态线反向缓冲器74ls467 八三态线缓冲器74ls468 八三态线反向缓冲器74ls490 双十进制计数器74ls540 八位三态总线缓冲器(反向)74ls541 八位三态总线缓冲器74ls589 有输入锁存的并入串出移位寄存器74ls590 带输出寄存器的8位二进制计数器74ls591 带输出寄存器的8位二进制计数器74ls592 带输出寄存器的8位二进制计数器74ls593 带输出寄存器的8位二进制计数器74ls594 带输出锁存的8位串入并出移位寄存器74ls595 8位输出锁存移位寄存器74ls596 带输出锁存的8位串入并出移位寄存器74ls597 8位输出锁存移位寄存器74ls598 带输入锁存的并入串出移位寄存器74ls599 带输出锁存的8位串入并出移位寄存器74ls604 双8位锁存器74ls605 双8位锁存器74ls606 双8位锁存器74ls607 双8位锁存器74ls620 8位三态总线发送接收器(反相)74ls621 8位总线收发器74ls622 8位总线收发器74ls623 8位总线收发器74ls640 反相总线收发器(三态输出)74ls641 同相8总线收发器,集电极开路74ls642 同相8总线收发器,集电极开路74ls643 8位三态总线发送接收器74ls644 真值反相8总线收发器,集电极开路74ls645 三态同相8总线收发器74ls646 八位总线收发器,寄存器74ls647 八位总线收发器,寄存器74ls648 八位总线收发器,寄存器74ls649 八位总线收发器,寄存器74ls651 三态反相8总线收发器74ls652 三态反相8总线收发器74ls653 反相8总线收发器,集电极开路74ls654 同相8总线收发器,集电极开路74ls668 4位同步加/减十进制计数器74ls669 带先行进位的4位同步二进制可逆计数器74ls670 4*4寄存器堆(三态)74ls671 带输出寄存的四位并入并出移位寄存器74ls672 带输出寄存的四位并入并出移位寄存器74ls673 16位并行输出存储器,16位串入串出移位寄存器74ls674 16位并行输入串行输出移位寄存器74ls681 4位并行二进制累加器74ls682 8位数值比较器(图腾柱输出)74ls683 8位数值比较器(集电极开路)74ls684 8位数值比较器(图腾柱输出)74ls685 8位数值比较器(集电极开路)74ls686 8位数值比较器(图腾柱输出)74ls687 8位数值比较器(集电极开路)74ls688 8位数字比较器(oc输出)74ls689 8位数字比较器74ls690 同步十进制计数器/寄存器(带数选,三态输出,直接清除)74ls691 计数器/寄存器(带多转换,三态输出)74ls692 同步十进制计数器(带预置输入,同步清除)74ls693 计数器/寄存器(带多转换,三态输出)74ls696 同步加/减十进制计数器/寄存器(带数选,三态输出,直接清除) 74ls697 计数器/寄存器(带多转换,三态输出)74ls698 计数器/寄存器(带多转换,三态输出) 74ls699 计数器/寄存器(带多转换,三态输出) 74ls716 可编程模n十进制计数器74ls718 可编程模n十进制计数器。
微机设计74ls245与74ls373开关电路实验报告总结
微机设计74ls245与74ls373开关电路实验报告总
结
该实验主要通过使用74ls245与74ls373芯片设计开关电路，实现不同的输入和输出功能，以及对芯片原理、电路设计、电路仿真和实验结果的总结和分析。
通过本次实验，我们深入了解了74ls245与74ls373芯片的工作原理和基本特性，掌握了电路设计和仿真的方法，加深了对数字电路的理解和应用。
通过分析实验结果和相应的数据，我们可以发现，在设计电路时，应该注重选用合适的芯片、电子元件和参数，遵循电路设计规范，充分考虑电路的稳定性和可靠性，以及对输入和输出信号的有效处理和控制。
在实验过程中，我们还需要注意安全措施和方法，如正确连接电路、保护电子元件、避免静电干扰和短路等问题，以确保实验的顺利进行和正确结果的输出。
综上所述，本次实验对我们深入学习和掌握数字电路的基础知识和实际应用具有重要的意义和启示，将为我们今后的学习和研究提供有益的参考和帮助。
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54LS245/74LS245 最小 额定 最大
4.5
5
5.5
4.75
5
5.25
2
0.7 0.8 -12 -15
12 24
单位 V V V mA mA
参
数பைடு நூலகம்
tPLH输出由低到高传输延迟时间 tPHL输出由高到低传输延迟时间 tPZH输出由高阻态到高允许时间 tPZL输出由高阻态到低允许时间 tPHZ输出由高到高阻态禁止时间 tPLZ输出由低到高阻态禁止时间
Vcc=最小，Iik=-18mA Vcc＝最小
Vcc＝最小，VIL＝最大，VIH=2V, IOH＝－3mA
LS245 最小 最大
-1.5 0.2
单位
V V
2.4
V
ｗｗｗ．ｅｌｅｃｆａｎｓ．ｃｏｍ
ＩＣ资料查询网站：
电子工程技术论坛：
VOL输出低电平电压
II最大输 入电压时
输出电流
A,B DIR,/G
IIH输入高电平电流
Vcc=最小，VIL＝最
54
大，VIH=2V, IOL=最大
74
Vcc＝最大
VI=5.5V VI=7V
Vcc＝最大，VIH=2.7V
IIL输入低电平电流
Vcc＝最大，VIL=0.4V
IOS输出短路电流 IOZH输出高阻态时高
电平电流 IOZL输出高阻态时低
电平电流
Icc 电源电流
Vcc＝最大
Vcc＝最大，VIH=2V VIL=最大，VO=2.7V Vcc＝最大，VIH=2V,VIL＝最大
，VO=0.4V
所有输出均为高电平
Vcc＝ 最大
所有输出均为低电平
所有输出均为高阻态
0.4
0.5
V
0.1 mA
0.1
20 uA
-0.2 mA
-40 -225 mA 20 uA
-200 uA
70 90 mA 96
ＩＣ资料查询网站：
电子工程技术论坛：
54/74245
双向总线发送器/接收器(3S)
简要说明: 245 为三态输出的八组总线收发器,其主要电器特性的典型值如下(不同厂家
具体值有差别):
型号
tPLH
54LS245/74LS245
8ns
tphl
PD
8ns
275mW
引出端符号: A B /G DIR
逻辑图:
A 总线端 B 总线端 三态允许端(低电平有效) 方向控制端
双列直插封装
极限值: 电源电压 …………………………………………. 输入电压 …………………………………………. 输出高阻态时高电平电压 …………………………. 工作环境温度
54LS245 ………………………………….
74LS245 …………………………………. 存储温度 ………………………………………….
[1]: 测试条件中的“最小”和“最大”用推荐工作条件中的相应值。
ｗｗｗ．ｅｌｅｃｆａｎｓ．ｃｏｍ
7V 7V 5.5V
-55~125℃ 0~70℃ -65~150℃
ｗｗｗ．ｅｌｅｃｆａｎｓ．ｃｏｍ
ＩＣ资料查询网站：
电子工程技术论坛：
功能表:
推荐工作条件:
电源电压 Vcc
54 74
输入高电平电ViH
输入低电平电ViL
54 74
输出高电平电流 54
IOH
74
输出低电平电流 54
IOL
74
动态特性(TA=25℃)
测试条件
Vcc =5V CL=45pF RL=667 Ω
Vcc=5V CL=5pF RL=90 Ω
静态特性（TA 为工作环境温度范围）
LS245 最大
12 12 40 40 25 25
单位
ns ns ns ns ns ns
参数
VIK输入嵌位电压 △VT滞后电压
VOH输出高电平电压
测 试 条 件【1】