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74ABT648DB Folha de dados(PDF) 4 Page - NXP Semiconductors

Nome de Peças 74ABT648DB
Descrição Electrónicos  Octal transceiver/register, inverting 3-State
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Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ABT648DB Folha de dados(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ABT648
Octal bus transceiver/register, inverting (3-State)
1998 Jun 08
4
FUNCTION TABLE
INPUTS
DATA I/O
OPERATING MODE
OE
DIR
CPAB
CPBA
SAB
SBA
An
Bn
X
X
X
X
X
Input
Unspecified
output*
Store A, B unspecified
X
X
X
X
X
Unspecified
output*
Input
Store B, A unspecified
H
H
X
X
H or L
H or L
X
X
X
X
Input
Input
Store A and B data
Isolation, hold storage
L
L
L
L
X
X
X
H or L
X
X
L
H
Output
Input
Real time B data to A bus
Stored B data to A bus
L
L
H
H
X
H or L
X
X
L
H
X
X
Input
Output
Real time A data to B bus
Stored A data to B bus
H = High voltage level
L
= Low voltage level
X = Don’t care
↑ = Low-to-High clock transition
*
The data output function may be enabled or disabled by various signals at the OE input. Data input functions are always enabled, i.e.,
data at the bus pins will be stored on every Low-to-High transition of the clock.
LOGIC DIAGRAM
1D
C1
Q
19
18
17
16
15
14
13
B1
B2
B3
B4
B5
B6
B7
A1
A2
A3
A4
A5
A6
A7
DETAIL A X 7
OE
DIR
CPBA
SBA
CPAB
SAB
20
B0
1D
C1
Q
4
A0
1of 8 Channels
SA00081
5
6
7
8
9
10
11
2
1
22
23
3
21


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