74HC259DB 데이터 시트보기 (PDF) - Philips Electronics
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74HC259DB Datasheet PDF : 11 Pages
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Philips Semiconductors
8-bit addressable latch
Product specification
74HC/HCT259
FUNCTION TABLE
OPERATING
MODES
master reset
INPUTS
OUTPUTS
MR LE D A0 A1 A2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
L HXXXXL
L
L
L
L
L
L
L
demultiplex
(active HIGH)
decoder
(when D = H)
L L d L L L Q=d L
L
L
L
L
L
L
L L d HL L L
Q=d L
L
L
L
L
L
L L d L HL L
L
Q=d L
L
L
L
L
L L d HHL L
L
L
Q=d L
L
L
L
L L d L L HL
L
L
L
Q=d L
L
L
L L d HL HL
L
L
L
L
Q=d L
L
L L d L HHL
L
L
L
L
L
Q=d L
L L d HHHL
L
L
L
L
L
L
Q=d
store (do nothing) H H X X X X q0 q1 q2 q3 q4 q5 q6 q7
HL
d
L
L
L
Q=d q1
q2
q3
q4
q5
q6
q7
HL
d
HL
L
q0
Q=d q2
q3
q4
q5
q6
q7
HL
d
L
HL
q0
q1
Q=d q3
q4
q5
q6
q7
HL
d
HHL
q0
q1
q2
Q=d q4
q5
q6
q7
addressable latch
HL
d
L
L
H q0
q1
q2
q3
Q=d q5
q6
q7
HL
d
HL
H q0
q1
q2
q3
q4
Q=d q6
q7
HL
d
L
H H q0
q1
q2
q3
q4
q5
Q=d q7
HL
d
H H H q0
q1
q2
q3
q4
q5
q6
Q=d
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
d = HIGH or LOW data one set-up time prior to the LOW-to-HIGH LE transition
q = lower case letters indicate the state of the referenced output established during the last cycle in which it was
addressed or cleared
December 1990
5
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