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DM74AS648WM Arkusz danych(PDF) 2 Page - Fairchild Semiconductor

Numer części DM74AS648WM
Szczegółowy opis  Octal Bus Transceiver and Register
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74AS648WM Arkusz danych(HTML) 2 Page - Fairchild Semiconductor

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Connection Diagram
Function Table
H—HIGH level; L—LOW level; X—irrelevant;
↑—LOW-to-HIGH level transition
Note 1: The data output functions may be enabled or disabled by various signals at the G and DIR 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.
Inputs
Data I/O (Note 1)
Operation or Function
G
DIR
CAB
CBA
SAB SBA A1 thru A8 B1 thru B8
DM74AS646
DM74AS648
H
X
H or L H or L
X
X
Input
Input
Isolation, Hold Storage
Isolation, Hold Storage
X
↑↑
X
X
Store A and B Data
Store A and B Data
L
L
X
X
X
L
Output
Input
Real Time B Data to A Bus
Real Time B Data to A Bus
L
X
H or L
X
H
Stored B Data to A Bus
Stored B Data to A Bus
L
H
X
X
L
X
Input
Output
Real Time A Data to B Bus
Real Time A Data to B Bus
H
H or L
X
H
X
Stored A Data to B Bus
Stored A Data to B Bus
XX
X
X
X
Input
Unspecified
(Note 1)
Store A, B Unspecified
(Note 1)
Store A, B Unspecified
(Note 1)
XX
X
X
X
Unspecified
(Note 1)
Input
Store B, A Unspecified
(Note 1)
Store B, A Unspecified
(Note 1)


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