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DM74AS651WM Datasheet(PDF) 2 Page - Fairchild Semiconductor

No. de pieza DM74AS651WM
Descripción Electrónicos  Octal Bus Transceiver and Register
Download  8 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74AS651WM Datasheet(HTML) 2 Page - Fairchild Semiconductor

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2
Connection Diagram
Function Table
H
= HIGH Level
L
= LOW Level
X
= Irrelevant
↑ = LOW-to-HIGH Transition
Note 1: The data output functions may be enabled or disabled by various signals at the GAB and GBA inputs. Data input functions are always enabled,
i.e., data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.
Note 2: If the select control is LOW, the clocks can occur simultaneously. If the select control is HIGH, the clocks must be staggered in order to load both
registers.
INPUTS
DATA I/O (Note 1)
OPERATION OR FUNCTION
GAB GBA
CAB
CBA
SAB
SBA
A1
B1
DM74AS651
DM74AS652
THRU
THRU
A8
B8
L
H
H or L H or L
X
X
Input
Input
Isolation
Isolation
LH
↑↑
X
X
Store A and B Data
Store A and B Data
LL
X
X
X
L
Output
Input
Real Time B Data to A
Bus
Real Time B Data to A
Bus
LL
X
H or L
X
H
Stored B Data to A Bus
Stored B Data to A Bus
HH
X
X
L
X
Input
Output
Real Time A Data to B
Bus
Real Time A Data to B
Bus
H
H
H or L
X
H
X
Stored A Data to B Bus
Stored A Data to B Bus
H
L
H or L H or L
H
H
Output
Output
Stored A Data to B Bus
Stored A Data to B Bus
& Stored B Data to A Bus & Stored B Data to A Bus
XH
H or L
X
X
Input
Unspecified
(Note 1)
Store A, Hold B
Store A, Hold B
HH
↑↑
X
(Note
2)
X
Input
Output
Store A in both registers
Store A in both registers
LX
H or L
X
X
Unspecified
(Note 1)
Input
Hold A, Store B
Hold A, Store B
LL
↑↑
XX
(Note
2)
Output
Input
Store B in both registers
Store B in both registers


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