MC74F538 查看數據表（PDF） - Motorola => Freescale
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MC74F538 Datasheet PDF : 4 Pages
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MC54 / 74F538
TRUTH TABLE
FUNCTION
High
Impedance
Disable
Active HIGH
Output
(P = L)
Active LOW
Output
(P = H)
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
INPUTS
OUTPUTS
OE1 OE2 E1 E2 E3 E4 A2 A1 A0 O0 O1 O2 O3 O4 O5 O6 O7
H
X
X
XXX X
XXZZZZ
Z
ZZZ
X
H
X
XXX X
XXZZZZ
Z
ZZZ
L
L
H XXX X XX
L
L
X HXX X XX
L
L
X XLX X XX
L
L
X XXL X XX
Outputs Equal P Input
L
L
L
LHH L
LLHLLL L
LLL
L
L
L
LHH L
LHLHL L
L
LLL
L
L
L
LHH L
HL L LHL
L
LLL
L
L
L
LHH L
HHL L LH L
LLL
L
L
L
LHH H
LLLLLL
H
LLL
L
L
L
LHH H
LHL L L L
L
HL L
L
L
L
LHH H
HL L L L L
L
LHL
L
L
L
LHH H
HHL L L L
L
L LH
L
L
L
LHH L
L L LHHH H HHH
L
L
L
LHH L
LHHLHH H
HHH
L
L
L
LHH L
HLHHLH H
HHH
L
L
L
LHH L
HHHHH L
H
HHH
L
L
L
LHH H
L LHHHH L
HHH
L
L
L
LHH H
LHHHHH H
L HH
L
L
L
LHH H
HLHHHH H
HLH
L
L
L
LHH H HHHHHH H HHL
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