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74ABT646A Arkusz danych(PDF) 4 Page - NXP Semiconductors

Numer części 74ABT646A
Szczegółowy opis  Octal bus transceiver/register 3-State
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ABT646A Arkusz danych(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ABT646A
Octal bus transceiver/register (3-State)
1998 Feb 17
4
FUNCTION TABLE
INPUTS
DATA I/O
OPERATING MODE
OE
DIR
CPAB
CPBA
SAB
SBA
An
Bn
OPERATING MODE
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
5
6
7
8
9
10
11
A1
A2
A3
A4
A5
A6
A7
DETAIL A X 7
OE
DIR
CPBA
SBA
CPAB
SAB
21
3
23
22
1
2
20
B0
1D
C1
Q
4
A0
1of 8 Channels
SA00086


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