MC74F259D Просмотр технического описания (PDF) - Motorola => Freescale
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MC74F259D Datasheet PDF : 5 Pages
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MC54/74F259
MODE SELECT TABLE
E MR
Mode
L H Addressable Latch
H H Memory
L L Active HIGH 8-Channel Demultiplexer
H L Clear
H = HIGH Voltage Level
L = LOW Voltage Level
FUNCTION TABLE
Operating
Mode
Master Reset
Inputs
Outputs
MR E D A0 A1 A2
Q0
Q1
Q2 Q3 Q4 Q5 Q6 Q7
L HXX X X
L
L
L
L
L
LL
L
Demultiplex
(Active HIGH
Decoder when
D = H)
L
L d L L L Q=d
L
L
L
L
LL
L
L
LdH L L
L
Q=d
L
L
L
LL
L
L
LdL H L
L
L
Q=d L
L
LL
L
•
••• • •
•
•
•
•
•
•
•
•
•
••• • •
•
•
•
•
•
•
•
•
•
••• • •
•
•
•
•
•
•
•
•
L
LdH H H
L
L
L
L
L
L L Q=d
Store
(Do Nothing)
H HXX X X
q0
q1
q2
q3 q4 q5 q6 q7
H
L d L L L Q=d
q1
q2
q3 q4 q5 q6 q7
Addressable
H
LdH L L
q0
Q=d
q2
q3 q4 q5 q6 q7
H
LdL H L
q0
q1
Q = d q3 q4 q5 q6 q7
•
••• • •
•
•
•
•
•
•
•
•
Latch
•
••• • •
•
•
•
•
•
•
•
•
•
••• • •
•
•
•
•
•
•
•
•
H = HIGH Voltage Level
H
LdH H H
q0
q1
q2
q3 q4 q5 q6 Q = d
L = LOW Voltage Level
X = Immaterial
d = HIGH or LOW Data one setup time prior to the LOW-to-HIGH Enable transition.
q = Lower case letters indicate the state of the referenced output established during the last cycle in which it was addressed or cleared.
FAST AND LS TTL DATA
4-135
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