MC74F251N 查看數據表（PDF） - Motorola => Freescale
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MC74F251N Datasheet PDF : 3 Pages
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MC54/74F251
FUNCTION TABLE
Inputs
OE
S2
S1
S0
H
X
X
X
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
Outputs
Z
Z
Z
Z
I0
I0
I1
I1
I2
I2
I3
I3
I4
I4
I5
I5
I6
I6
I7
I7
LOGIC DIAGRAM
I0
I1
I2
I3
I4
I5
I6
I7
S2
S1
S0
OE
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
Z
Z
Min
Typ
Max
Unit
54, 74
4.5
5.0
5.5
V
54
-55
25
125
°C
74
0
25
70
54, 74
–3.0
mA
54, 74
24
mA
FAST AND LS TTL DATA
4-118
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