74HC240是一款常见的驱动信号芯片,常用于各种单片机mcu系统中,单片机io口输出的电流很小而240芯片就是用来放大电流并且反相输出,74hc240的pdf资料下载:http://www.51hei.com/f/74hc244.pdf
74HC240是双线八路反相缓冲器/线路驱动器,具有三态输出。该三态输出由输出使能端1OE和2OE控制。任意nOE上的高电平将使输出端呈现高阻态。
74HC240与74HC244逻辑功能相似,只不过74HC240带有反相输出。74hc245具有双向的功能详细资料见:http://www.51hei.com/chip/3507.html
74HC240是CMOS电路,74ls240是双极晶体管型电路,二者的特性差别很大,LS器件是淘汰型,尽量不要选用。
74HC240,74HC241,74HC244为同一系列的产品,他们的区别很小在引脚及其功能方面下面的中文资料中都有详细的说明.
74hc240与74hc244,74hc241的管脚图对比 可以看出他们的功能是十分接近,其中240多一个反相 的功能
74hc244及74hc241 74hc240功能表 我们可以看到240具有反相输出的功能.
74HC240 特性
- 反相三态输出
- 可选多种封装类型
- 兼容JEDEC标准no.7A
- ESD保护
- HBM EIA/JESD22-A114-D超过2000 V
- MM EIA/JESD22-A115-A超过200 V
- 温度范围
- -40~+85 ℃
- -40~+125 ℃
DC Electrical Specifications直流电气规格:
Parameter 参数 | Symbol 符号 | TEST Conditions 测试条件 | 25℃ | -40℃TO85℃ | -55℃TO125℃ | UNIT 单位 | ||||||||
VI (V) | IO (mA) | VCC (V) | 最小 | 典型 | 最大 | 最小 | 最大 | 最小 | 最大 | |||||
High Level Input Voltage输入高电平电压 | VIH | - | - | 2 | 1.5 | - | - | 1.5 | - | 1.5 | - | V | ||
4.5 | 3.15 | - | - | 3.15 | - | 3.15 | - | V | ||||||
6 | 4.2 | - | - | 4.2 | - | 4.2 | - | V | ||||||
LOW Level Input Voltage 输入低电平电压 | VIL | - | - | 2 | - | - | 0.5 | - | 0.5 | - | 0.5 | V | ||
4.5 | - | - | 1.35 | - | 1.35 | - | 1.35 | V | ||||||
6 | - | - | 1.8 | - | 1.8 | - | 1.8 | V | ||||||
HIGH Level Output Voltage输出高电平电压 CMOS负载 | VOH | VIH or VIL | -0.02 | 2 | 1.9 | - | - | 1.9 | - | 1.9 | - | V | ||
-0.02 | 4.5 | 4.4 | - | - | 4.4 | - | 4.4 | - | V | |||||
-0.02 | 6 | 5.9 | - | - | 5.9 | - | 5.9 | - | V | |||||
HIGH Level Output Voltage输出高电平电压 TTL负载 | -6 | 4.5 | 3.98 | - | - | 3.84 | - | 3.7 | - | V | ||||
-7.8 | 6 | 5.48 | - | - | 5.34 | - | 5.2 | - | V | |||||
Low Level Output Voltage 输出低电平电压 CMOS负载 | VOL | VIH or VIL | 0.02 | 2 | - | - | 0.1 | - | 0.1 | - | 0.1 | V | ||
0.02 | 4.5 | - | - | 0.1 | - | 0.1 | - | 0.1 | V | |||||
0.02 | 6 | - | - | 0.1 | - | 0.1 | - | 0.1 | V | |||||
Low Level Output Voltage输出低电平电压 TTL负载 | 6 | 4.5 | - | - | 0.26 | - | 0.33 | - | 0.4 | V | ||||
7.8 | 6 | - | - | 0.26 | - | 0.33 | - | 0.4 | V | |||||
Input Leakage Current输入漏电流 | II | VCC or GND | - | 6 | - | - | ±0.1 | - | ±1 | - | ±1 | μA | ||
Quiescent Device Current静态电流 | ICC | VCC or GND | 0 | 6 | - | - | 8 | - | 80 | - | 160 | μA |
DC Electrical Specifications直流电气规格(续)
Parameter 参数 | Symbol 符号 | TEST Conditions 条件 | 25℃ | -40℃ TO 85℃ | -55℃ TO 125℃ | UNIT 单位 | |||||||||
VI (V) | IO (mA) | VCC (V) | 最小 | 典型 | 最大 | 最小 | 最大 | 最小 | 最大 | ||||||
Three-State Leakage Current三态泄漏电流 | IOZ | VIL or VIH | - | 6 | - | - | ±0.5 | - | ±0.5 | - | ±10 | μA | |||
High Level Input Voltage输入高电平电压 | VIH | - | - | 4.5 to 5.5 | 2 | - | - | 2 | - | 2 | - | V | |||
LOW Level Input Voltage 输入低电平电压 | VIL | - | - | 4.5 to 5.5 | - | - | 0.8 | - | 0.8 | - | 0.8 | V | |||
HIGH Level Output Voltage输出高电平电压 CMOS 负载 | VOH | VIH or VIL | -0.02 | 4.5 | 4.4 | - | - | 4.4 | - | 4.4 | - | V | |||
HIGH Level Output Voltage输出高电平电压 TTL负载 | -6 | 4.5 | 3.98 | - | - | 3.84 | - | 3.7 | - | V | |||||
Low Level Output Voltage 输出低电平电压 CMOS负载 | VOL | VIH or VIL | 0.02 | 4.5 | - | - | 0.1 | - | 0.1 | - | 0.1 | V | |||
Low Level Output Voltage 输出低电平电压TTL负载 | 6 | 4.5 | - | - | 0.26 | - | 0.33 | - | 0.4 | V | |||||
Input Leakage Current输入漏电流 | II | VCC to GND | 0 | 5.5 | - | - | ±0.1 | - | ±1 | - | ±1 | μA | |||
Quiescent Device Current静态电流 | ICC | VCC or GND | 0 | 5.5 | - | - | 8 | - | 80 | - | 160 | μA | |||
Additional Quiescent Device Current Per Input Pin: 1 UNIT Load附加静态目前的输入引脚: 1单位负载 | ΔICC (Note 2) | VCC -2.1 | - | 4.5 to 5.5 | - | 100 | 360 | - | 450 | - | 490 | μA | |||
Three-State Leakage Current三态泄漏电流 | IOZ | VIL or VIH | - | 5.5 | - | - | ±0.5 | - | ±5 | - | ±10 | μA |
Switching Specifications开关特性规格 CL = 50pF, Input tr, tf = 6ns
Parameter 参数 | Symbol 符号 | TEST CONDI-TIONS | VCC (V) | 25℃ | -40℃ TO 85℃ | -55℃ TO 125℃ | UNIT 单位 | ||||||
最小 | 典型 | 最大 | 最小 | 典型 | 最大 | 最小 | 典型 | 最大 | |||||
Propagation Delay传播延迟 Data to Outputs 74HC240 | tPLH, tPHL | CL = 50pF | 2 | - | - | 100 | - | - | 125 | - | - | 150 | ns |
4.5 | - | - | 20 | - | - | 25 | - | - | 30 | ns | |||
CL = 15pF | 5 | - | 8 | - | - | - | - | - | - | - | ns | ||
CL = 50pF | 6 | - | - | 17 | - | - | 21 | - | - | 26 | ns | ||
Data to Outputs数据输出 74HC241 | tPLH, tPHL | CL = 50pF | 2 | - | - | 110 | - | - | 140 | - | - | 165 | ns |
4.5 | - | - | 22 | - | - | 28 | - | - | 33 | ns | |||
CL = 15pF | 5 | - | 9 | - | - | - | - | - | - | - | ns | ||
CL = 50pF | 6 | - | - | 19 | - | - | 24 | - | - | 28 | ns | ||
Data to Outputs数据输出 74HC244 | tPLH, tPHL | CL = 50pF | 2 | - | - | 110 | - | - | 140 | - | - | 165 | ns |
4.5 | - | - | 22 | - | - | 28 | - | - | 33 | ns | |||
CL = 15pF | 5 | - | 9 | - | - | - | - | - | - | - | ns | ||
CL = 50pF | 6 | - | - | 19 | - | - | 24 | - | - | 28 | ns | ||
Output Enable and Disable Time输出启用和停用时间 | tTHL, tTLH | CL = 50pF | 2 | - | - | 150 | - | - | 190 | - | - | 225 | ns |
4.5 | - | - | 30 | - | - | 38 | - | - | 45 | ns | |||
5 | - | 12 | - | - | - | - | - | - | - | ns | |||
6 | - | - | 26 | - | - | 33 | - | - | 38 | ns | |||
Output Transition Time输出过渡时间 | tTLH, tTHL | CL = 50pF | 2 | - | - | 60 | - | - | 75 | - | - | 90 | ns |
4.5 | - | - | 12 | - | - | 15 | - | - | 18 | ns | |||
6 | - | - | 10 | - | - | 13 | - | - | 15 | ns | |||
Input Capacitance输入电容 | CI | CL = 50pF | - | 10 | - | 10 | - | - | 10 | - | - | 10 | pF |
Three-State Output Capacitance三态输出电容 | CO | CL = 50pF | - | - | - | 20 | - | - | 20 | - | - | 20 | pF |
Power Dissipation Capacitance 功耗电容 | |||||||||||||
74HC240 | - | CL = 15pF | 5 | - | 38 | - | - | - | - | - | - | - | pF |
74HC241 | - | - | 5 | - | 34 | - | - | - | - | - | - | - | pF |
74HC244 | - | - | 5 | - | 46 | - | - | - | - | - | - | - | pF |
HCT 类型 | |||||||||||||
数据输出传播延迟HCT240 | tPHL, tPLH | CL = 50pF | 4.5 | - | - | 22 | - | - | 28 | - | - | 33 | ns |
CL = 15pF | 5 | - | 9 | - | - | - | - | - | - | - | ns | ||
Data to Outputs 数据输出HCT241 | tPHL, tPLH | CL = 50pF | 4.5 | - | - | 25 | - | - | 31 | - | - | 38 | ns |
CL = 15pF | 5 | - | 10 | - | - | - | - | - | - | - | ns | ||
Data to Outputs 数据输出HCT244 | tPHL, tPLH | CL = 50pF | 4.5 | - | - | 25 | - | - | 31 | - | - | 38 | ns |
CL = 15pF | 5 | - | 10 | - | - | - | - | - | - | - | ns |