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74LS279 参数 Datasheet PDF下载

74LS279图片预览
型号: 74LS279
PDF下载: 下载PDF文件 查看货源
内容描述: 四S- R锁存 [Quad S-R Latch]
分类和应用: 逻辑集成电路
文件页数/大小: 4 页 / 51 K
品牌: FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
 浏览型号74LS279的Datasheet PDF文件第1页浏览型号74LS279的Datasheet PDF文件第3页浏览型号74LS279的Datasheet PDF文件第4页  
Absolute Maximum Ratings(Note 3)  
Note 3: 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.  
Supply Voltage  
Input Voltage  
7V  
7V  
Operating Free Air Temperature Range  
Storage Temperature Range  
0°C to +70°C  
65°C to +150°C  
Recommended Operating Conditions  
Symbol  
Parameter  
Min  
4.75  
2
Nom  
Max  
Units  
V
VCC  
VIH  
VIL  
IOH  
IOL  
TA  
Supply Voltage  
5
5.25  
HIGH Level Input Voltage  
LOW Level Input Voltage  
HIGH Level Output Current  
LOW Level Output Current  
Free Air Operating Temperature  
V
0.8  
0.4  
8
V
mA  
mA  
°C  
0
70  
Electrical Characteristics  
over recommended operating free air temperature range (unless otherwise noted)  
Symbol Parameter Conditions  
Input Clamp Voltage = Min, I = −18 mA  
Typ  
Min  
Max  
Units  
(Note 4)  
V
V
V
V
V
V
V
1.5  
V
V
I
CC  
CC  
I
HIGH Level  
= Min, I = Max  
OH  
OH  
2.7  
3.5  
Output Voltage  
LOW Level  
= Max, V = Min  
IH  
IL  
V
= Min, I = Max  
OL  
OL  
CC  
0.35  
0.25  
0.5  
Output Voltage  
= Max, V = Min  
V
IL  
IH  
I
= 4 mA, V = Min  
0.4  
0.1  
20  
OL  
CC  
I
Input Current @ Max Input Voltage  
HIGH Level Input Current  
LOW Level Input Current  
Short Circuit Output Current  
Supply Current  
V
= Max, V = 7V  
mA  
µA  
I
CC  
CC  
CC  
CC  
CC  
I
I
V
V
V
V
= Max, V = 2.7V  
I
IH  
I
= Max, V = 0.4V  
0.4  
100  
7
mA  
mA  
mA  
IL  
I
I
= Max (Note 5)  
= Max (Note 6)  
20  
OS  
I
3.8  
CC  
Note 4: All typicals are at V = 5V, T = 25°C.  
CC  
A
Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second.  
Note 6: I is measured with all R inputs grounded, all S inputs at 4.5V and all outputs OPEN.  
CC  
Switching Characteristics  
at VCC = 5V and T = 25°C  
A
R
= 2 kΩ  
From (Input)  
L
Symbol  
Parameter  
C
= 15 pF  
C
= 50 pF  
L
Units  
To (Output)  
L
Min  
Max  
Min  
Max  
t
Propagation Delay Time  
LOW-to-HIGH Level Output  
Propagation Delay Time  
HIGH-to-LOW Level Output  
Propagation Delay Time  
HIGH-to-LOW Level Output  
PLH  
S to Q  
S to Q  
R to Q  
22  
15  
27  
25  
ns  
ns  
ns  
t
t
PHL  
PHL  
23  
33  
www.fairchildsemi.com  
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