74HC595 是一款漏极开路输出的CMOS 移位寄存器,输出端口为可控的三态输出端,亦能串行输出控制下一级级联芯片。
74HC595特点:
高速移位时钟频率Fmax>25MHz
标准串行(SPI)接口
CMOS 串行输出,可用于多个设备的级联
低功耗:TA =25℃时,Icc=4μA(MAX)
图1 74HC595引脚图
74HC595引脚功能表:
管脚编号 |
管脚名 |
管脚定义功能 |
1、2、3、4、5、6、7、15 |
QA—QH |
三态输出管脚 |
8 |
GND |
电源地 |
9 |
SQH |
串行数据输出管脚 |
10 |
SCLR |
移位寄存器清零端 |
11 |
SCK |
数据输入时钟线 |
12 |
RCK |
输出存储器锁存时钟线 |
13 |
OE |
输出使能 |
14 |
SI |
数据线 |
15 |
VCC |
电源端 |
图2 74HC595逻辑图
74HC595真值表:
输入管脚 |
输出管脚 | ||||
SI |
SCK |
SCLR |
RCK |
OE | |
X |
X |
X |
X |
H |
QA—QH 输出高阻 |
X |
X |
X |
X |
L |
QA—QH 输出有效值 |
X |
X |
L |
X |
X |
移位寄存器清零 |
L |
上沿 |
H |
X |
X |
移位寄存器存储L |
H |
上沿 |
H |
X |
X |
移位寄存器存储H |
X |
下沿 |
H |
X |
X |
移位寄存器状态保持 |
X |
X |
X |
上沿 |
X |
输出存储器锁存移位寄存器中的状态值 |
X |
X |
X |
下沿 |
X |
输出存储器状态保持 |
74HC595参数:
Absolute Maximum Ratings绝对最大额定值
参数 |
数值 |
Supply Voltage电源电压(VCC) |
−0.5 to +7.0V |
DC Input Voltage 直流输入电压(VIN) |
−1.5 to VCC +1.5V |
DC Output Voltage 直流输出电压(VOUT) |
−0.5 to VCC +0.5V |
Clamp Diode Current 钳位二极管电流(IIK, IOK) |
±20mA |
DC Output Current直流输出电流,每个引脚(输出) |
±35mA |
DC VCC or GND Current,per pin (ICC) |
±70mA |
Storage Temperature Range 储存温度范围(TSTG) |
−65℃ to +150℃ |
Power Dissipation 功耗(PD) | |
(Note 3) |
600mW |
S.O. Package only |
500mW |
Lead Temperature (TL) (Soldering 10 seconds) |
260℃ |
Recommended Operating Conditions建议操作条件
参数 |
最小 |
最大 |
单位 |
Supply Voltage电源电压(VCC) |
2 |
6 |
v |
DC Input or Output Voltage(VIN, VOUT)输入输出电压 |
0 |
VCC |
V |
Operating Temperature Range工作温度范围 (TA) |
−40 |
+85 |
℃ |
Input Rise or Fall Times 输入上升或下降时间 | |||
(tr,tf) VCC = 2.0V |
- |
1000 |
ns |
VCC = 4.5V |
- |
500 |
ns |
VCC = 6.0V |
- |
400 |
ns |
DC SPECIFICATIONS直流电气规格
Symbol 符号 |
Parameter 参数 |
Conditions 条件 |
VCC |
TA=25℃ |
TA= −40to85℃ |
TA= −55to125℃ |
UNIT 单位 | |
典型 |
Guaranteed Limits保证界限 | |||||||
VIH |
Minimum High Level Input Voltage最大高电平输入电压 |
- |
2.0V |
- |
1.5 |
1.5 |
1.5 |
V |
4.5V |
- |
3.15 |
3.15 |
3.15 | ||||
6.0V |
- |
4.2 |
4.2 |
4.2 | ||||
VIL |
Maximum LOW Level Input Voltage最大低电平输入电压 |
- |
2.0V |
- |
0.5 |
0.5 |
0.5 |
V |
4.5V |
- |
1.35 |
1.35 |
1.35 | ||||
6.0V |
- |
1.8 |
1.8 |
1.8 | ||||
VOH |
Minimum HIGH Level Output Voltage最大高电平输出电压 |
VIN=VIH or VIL|IOUT|≤20μA |
2.0V |
2.0 |
1.9 |
1.9 |
1.9 |
V |
4.5V |
4.5 |
4.4 |
4.4 |
4.4 | ||||
6.0V |
6.0 |
5.9 |
5.9 |
5.9 | ||||
Q'H |
VIN = VIH or VIL |
V | ||||||
|IOUT| ≤4.0mA |
4.5V |
4.2 |
3.98 |
3.84 |
3.7 | |||
|IOUT| ≤5.2mA |
6.0V |
5.2 |
5.48 |
5.34 |
5.2 | |||
QA thru QH |
VIN = VIH or VIL |
V | ||||||
|IOUT| ≤6.0mA |
4.5V |
4.2 |
3.98 |
3.84 |
3.7 | |||
IOUT| ≤ 7.8mA |
6.0V |
5.7 |
5.48 |
5.34 |
5.2 | |||
VOL |
Maximum LOW Level Output Voltage最大低电平输出电压 |
VIN=VIH or VIL|IOUT| ≤ 20μA |
2.0V |
0 |
0.1 |
0.1 |
0.1 |
V |
4.5V |
0 |
0.1 |
0.1 |
0.1 | ||||
6.0V |
0 |
0.1 |
0.1 |
0.1 | ||||
Q'H |
VIN = VIH or VIL |
V | ||||||
|IOUT| ≤ 4mA |
4.5V |
0.2 |
0.26 |
0.33 |
0.4 | |||
|IOUT| ≤5.2mA |
6.0V |
0.2 |
0.26 |
0.33 |
0.4 | |||
QA thru QH |
VIN = VIH or VIL |
V | ||||||
|IOUT| ≤6.0mA |
4.5V |
0.2 |
0.26 |
0.33 |
0.4 | |||
|IOUT| ≤7.8mA |
6.0V |
0.2 |
0.26 |
0.33 |
0.4 | |||
IIN |
Maximum Input Current最大输入电流 |
VIN=VCC or GND |
6.0V |
- |
±0.1 |
±1.0 |
±1.0 |
μA |
IOZ |
Maximum 3-STATE Output Leakage最大3态输出泄漏电流 |
VOUT = VCC or GND G = VIH |
6.0V |
- |
±0.5 |
±5.0 |
±10 |
μA |
ICC |
Maximum Quiescent Supply Current电源电流 |
VIN=VCC or GND IOUT = 0μA |
6.0V |
- |
8.0 |
80 |
160 |
μA |
交流电气特性:
Symbol 符号 |
Parameter 参数 |
Conditions 条件 |
典型 |
Guaranteed Limit |
UNIT 单位 |
fMax |
最高工作频率 |
- |
50 |
30 |
MHz |
tPHL, tPLH |
Maximum Propagation Delay,最大传输延迟 SCK to Q’ H |
CL = 45 pF |
12 |
20 |
ns |
tPHL, tPLH |
Maximum Propagation Delay, 最大传输延迟RCK to QA thru QH |
CL = 45 pF |
18 |
30 |
ns |
tPZH, tPZL |
Maximum Output Enable Time from G to QA thru QH 最大输出启用时间G to QA thru QH |
RL=1kΩ CL=45pF |
17 |
28 |
ns |
tPHZ, tPLZ |
Maximum Output Disable Time from G to QA thru QH最大输出禁用时间G to QA thru QH |
RL=1kΩ CL=5pF |
15 |
25 |
ns |
tS |
Minimum Setup Time from SER to SCK |
- |
- |
20 |
ns |
tS |
Minimum Setup Time from SCLR to SCK |
- |
- |
20 |
ns |
tS |
Minimum Setup Time from SCK to RCK |
- |
- |
40 |
ns |
tH |
Minimum Hold Time from SER to SCK |
- |
- |
0 |
ns |
tW |
Minimum Pulse Width of SCK or RCK |
- |
- |
16 |
ns |
图3 74HC595 时序图图