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74ALS646-1 Datasheet(PDF) 4 Page - NXP Semiconductors

No. de pieza 74ALS646-1
Descripción Electrónicos  Transceiver/register
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ALS646-1 Datasheet(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ALS646/74ALS646-1
74ALS648/74ALS648-1
Transceiver/register
1991 Feb 08
4
BUS MANAGEMENT FUNCTIONS
The following examples demonstrate the four fundamental
bus-management functions that can be performed with the
74ALS646/646-1 and 74ALS648/648-1.
The select pins determine whether data is stored or transferred
through the device in real time.
The DIR determines which bus will receive data when the OE pin is
Low.
REAL TIME BUS TRANSFER
BUS B TO BUS A
REAL TIME BUS TRANSFER
BUS A TO BUS B
STORAGE FROM
A, B, OR A AND B
TRANSFER STORED DATA
TO A AND/OR B
OE DIR CPAB CPBA SAB SBA
LL
X
X
X
L
BUS A
BUS A
BUS A
BUS A
BUS B
BUS B
BUS B
BUS B
OE DIR CPAB CPBA SAB SBA
LH
X
X
L
X
OE DIR CPAB CPBA SAB SBA
XX
XX
X
XX
X
XX
HX
↑↑
XX
OE DIR CPAB CPBA SAB SBA
L
L
X
H or L
X
H
L
H
H or L
X
H
X
SF00392


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