SN74LS280 查看數據表（PDF） - Motorola => Freescale
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SN74LS280 Datasheet PDF : 4 Pages
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FUNCTIONAL BLOCK DIAGRAM
(8)
A
(9)
B
(10)
C
(11)
D
(12)
E
(13)
F
(1)
G
(2)
H
(4)
I
SN54 / 74LS280
∑ (5)
EVEN
∑ (6)
ODD
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
54
VIL
Input LOW Voltage
74
0.7
Guaranteed Input LOW Voltage for
0.8
V
All Inputs
VIK
VOH
Input Clamp Diode Voltage
54
Output HIGH Voltage
74
– 0.65 – 1.5
2.5
3.5
2.7
3.5
V
VCC = MIN, IIN = – 18 mA
V
VCC = MIN, IOH = MAX, VIN = VIH
V
or VIL per Truth Table
VOL
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V
IOL = 4.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
V
IOL = 8.0 mA
per Truth Table
IIH
Input HIGH Current
20
µA VCC = MAX, VIN = 2.7 V
0.1
mA VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
– 0.4 mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
– 20
– 100 mA VCC = MAX
ICC
Power Supply Current
27
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH
tPHL
Propagation Delay, Data to Output
ΣEVEN
33
29
50
45
ns
tPLH
tPHL
Propagation Delay, Data to Output
ΣODD
23
31
35
50
ns
Test Conditions
CL = 15 pF
FAST AND LS TTL DATA
5-457
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