74AHCT259D 데이터 시트보기 (PDF) - NXP Semiconductors.
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74AHCT259D Datasheet PDF : 17 Pages
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NXP Semiconductors
74AHC259; 74AHCT259
8-bit addressable latch
Table 2.
Symbol
Q6
Q7
D
LE
MR
VCC
Pin description …continued
Pin
Description
11
latch output
12
latch output
13
data input
14
latch enable input (active LOW)
15
conditional reset input (active LOW)
16
supply voltage
6. Functional description
Table 3. Function table[1]
Operating mode
Input
MR LE D
Reset (clear)
L HX
Demultiplexer
LLd
(active HIGH 8-channel)
d
decoder (when D = H)
d
d
d
d
d
d
Memory (no action)
HHX
Addressable latch
HL d
d
d
d
d
d
d
H
Output
A0 A1 A2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
XXXL
L
L
L
L
L
L
L
L L L Q=d L
L
L
L
L
L
L
HL L L
Q=d L
L
L
L
L
L
L HL L
L
Q=d L
L
L
L
L
HHL L
L
L
Q=d L
L
L
L
L L HL
L
L
L
Q=d L
L
L
HL HL
L
L
L
L
Q=d L
L
L HHL
L
L
L
L
L
Q=d L
HHHL
L
L
L
L
L
L
Q=d
X X X q0
q1
q2
q3
q4
q5
q6
q7
L
L
L
Q = d q1
q2
q3
q4
q5
q6
q7
HL
L
q0
Q = d q2
q3
q4
q5
q6
q7
L
HL
q0
q1
Q = d q3
q4
q5
q6
q7
HHL
q0
q1
q2
Q = d q4
q5
q6
q7
L
L
H q0
q1
q2
q3
Q = d q5
q6
q7
HL
H q0
q1
q2
q3
q4
Q = d q6
q7
L
H H q0
q1
q2
q3
q4
q5
Q = d q7
H H H q0
q1
q2
q3
q4
q5
q6
Q=d
[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 letter indicates the state of the referenced input one set-up time prior to the LOW-to-HIGH transition.
74AHC_AHCT259_2
Product data sheet
Rev. 02 — 15 May 2008
© NXP B.V. 2008. All rights reserved.
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