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74ABT845 bảng dữ liệu(PDF) 2 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  8-bit bus interface latch with set and reset 3-State
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74ABT845 bảng dữ liệu(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ABT845
8-bit bus interface latch with set and reset
(3-State)
1995 Sep 06
2
LOGIC SYMBOL (IEEE/IEC)
3
4
5
6
7
8
9
C1
13
R
11
10
S2
14
23
EN
2
1
&
2
1D
22
21
20
19
18
17
16
15
SA00260
LOGIC SYMBOL
13
14
LE
PRE
11
1
MR
OE0
2
OE1
23
OE2
34
56
78
9
10
D0 D1 D2 D3 D4 D5 D6 D7
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
22 21 20 19 18 17 16 15
SA00259
FUNCTION TABLE
INPUTS
OUTPU
TS
OPERATING
MODE
OE
n
PR
E
MR
LE
Dn
Qn
L
L
X
X
X
H
Preset
L
H
L
X
X
L
Clear
L
L
H
H
H
H
H
H
L
H
L
H
Transparent
L
L
H
H
H
H
l
h
L
H
Latched
H
X
X
X
X
Z
High impedance
L
H
H
L
X
NC
Hold
H = High voltage level
h
= High voltage level one set-up time prior to the High-to-Low LE
transition
L
= Low voltage level
l
= Low voltage level one set-up time prior to the High-to-Low LE
transition
NC= No change
X = Don’t care
Z = High impedance “off” state
↓ = High-to-Low transition
LOGIC DIAGRAM
13
LE
2
OE1
LQ
D
3
D0
Q0
22
LQ
D
4
D1
Q1
21
LQ
D
5
D2
Q2
20
LQ
D
6
D3
Q3
19
LQ
D
7
D4
Q4
18
LQ
D
8
D5
Q5
17
LQ
D
9
D6
Q6
16
LQ
D
10
D7
Q7
PP
PP
P
P
P
P
15
C
C
C
C
C
C
C
C
11
MR
14
PRE
OE0
OE2
1
23
SA00261


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