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74AHC259 データシート(PDF) 4 Page - NXP Semiconductors

部品番号 74AHC259
部品情報  8-bit addressable latch
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo NXP - NXP Semiconductors

74AHC259 データシート(HTML) 4 Page - NXP Semiconductors

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74AHC_AHCT259_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 15 May 2008
4 of 17
NXP Semiconductors
74AHC259; 74AHCT259
8-bit addressable latch
6.
Functional description
[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.
Q6
11
latch output
Q7
12
latch output
D
13
data input
LE
14
latch enable input (active LOW)
MR
15
conditional reset input (active LOW)
VCC
16
supply voltage
Table 2.
Pin description …continued
Symbol
Pin
Description
Table 3.
Function table[1]
Operating mode
Input
Output
MR
LE
D
A0
A1
A2
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Reset (clear)
L
H
XXXX
LLLLLLLL
Demultiplexer
(active HIGH 8-channel)
decoder (when D = H)
LLdLLLQ = d LLLLLLL
d
H
L
L
L
Q = d LLLLLL
d
L
H
L
LLQ = d LLLLL
d
H
H
L
LLLQ = d LLLL
dLLH
LLLLQ = d LLL
d
H
L
H
LLLLLQ = d LL
d
L
H
H
LLLLLLQ = d L
d
H
H
H
LLLLLLLQ = d
Memory (no action)
H
H
XXXXq0
q1
q2
q3
q4
q5
q6
q7
Addressable latch
H
LdLLLQ = d q1
q2
q3
q4
q5
q6
q7
dH
LLq0
Q=d q2
q3
q4
q5
q6
q7
dLH
Lq0
q1
Q=d q3
q4
q5
q6
q7
d
HHL
q0
q1
q2
Q=d q4
q5
q6
q7
dLLH
q0
q1
q2
q3
Q=d q5
q6
q7
dH
LH
q0
q1
q2
q3
q4
Q=d q6
q7
d
L
HHq0
q1
q2
q3
q4
q5
Q=d q7
HHHHq0
q1
q2
q3
q4
q5
q6
Q=d


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