Unit Loading Fan Out
54F 74F
Pin Names
Description
UL
HIGH LOW
1 0 1 667
1 0 1 667
1 0 1 667
1 0 2 667
600 106 6 (80)
Input I
IH
I
IL
Output I
OH
I
OL
20
mA
b
1 mA
20
mA
b
1 mA
20
mA
b
1 mA
20
mA
b
1 6 mA
b
12 mA 64 mA (48 mA)
OE
1
OE
2
OE
2
I
0
–I
7
I
0
–I
7
O
0
–O
7
O
0
– O
7
TRI-STATE Output Enable Input (Active LOW)
TRI-STATE Output Enable Input (Active HIGH)
Inputs (’F240)
Inputs (’F241 ’F244)
Outputs
Worst-case ’F240 enabled ’F241 ’F244 disabled
Truth Tables
’F240
OE
1
H
L
L
D
1n
X
H
L
O
1n
Z
L
H
’F241
OE
1
H
L
L
D
1n
X
H
L
O
1n
Z
H
L
OE
2
L
H
H
D
2n
X
H
L
O
2n
Z
H
L
OE
2
H
L
L
D
2n
X
H
L
O
2n
Z
L
H
OE
1
H
L
L
D
1n
X
H
L
O
1n
Z
H
L
’F244
OE
2
H
L
L
D
2n
X
H
L
O
2n
Z
H
L
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Z
e
High Impedance
3