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SN74ABT646A Datasheet(Hoja de datos) 4 Page - Texas Instruments

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No. de Pieza. SN74ABT646A
Descripción  OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUPUTS
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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SN54ABT646A, SN74ABT646A
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3STATE OUTPUTS
SCBS069H − JULY 1991 − REVISED MAY 2004
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
INPUTS
DATA I/Os
OPERATION OR FUNCTION
OE
DIR
CLKAB
CLKBA
SAB
SBA
A1−A8
B1−B8
OPERATION OR FUNCTION
X
X
X
X
X
Input
Unspecified†
Store A, B unspecified†
X
XX
X
X
Unspecified†
Input
Store B, A unspecified†
H
X
X
X
Input
Input
Store A and B data
H
X
H or L
H or L
X
X
Input disabled
Input disabled
Isolation, hold storage
L
L
X
X
X
L
Output
Input
Real-time B data to A bus
L
L
X
H or L
X
H
Output
Input
Stored B data to A bus
L
H
X
X
L
X
Input
Output
Real-time A data to B bus
L
H
H or L
X
H
X
Input
Output
Stored A data to B bus
† The data-output functions can be enabled or disabled by various signals at OE and DIR. Data-input functions always are enabled, i.e., data at
the bus terminals is stored on every low-to-high transition of the clock inputs.
logic diagram (positive logic)
A1
B1
One of Eight
Channels
SAB
CLKAB
SBA
CLKBA
DIR
OE
To Seven Other Channels
Pin numbers shown are for the DB, DGV, DW, JT, NS, NT, PW, and W packages.
21
3
23
22
1
2
4
20
1D
C1
1D
C1




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