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DM74ALS646 データシート(PDF) 2 Page - Fairchild Semiconductor

部品番号 DM74ALS646
部品情報  Octal 3-STATE Bus Transceiver and Register
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74ALS646 データシート(HTML) 2 Page - Fairchild Semiconductor

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2
Connection Diagram
Function Table
H
= HIGH Logic Level
L
= LOW Logic Level
X
= Don’t Care (Either LOW or HIGH Logic Levels including transitions)
H/L
= Either LOW or HIGH Logic Level excluding transitions
↑ = Positive going edge of pulse
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.
Logic Diagram
Inputs
Data I/O (Note 1)
Operation or Function
G
DIR CAB CBA SAB SBA
A1 thru A8
B1 thru B8
XX
X
X
X
Input
Not Specified Store A, B Unspecified
XX
X
X
X
Not Specified
Input
Store B, A Unspecified
HX
↑↑
X
X
Input
Input
Store A and B Data
H
X
H/L
H/L
X
X
Input
Input
Isolation, Hold Storage
L
L
X
X
X
L
Output
Input
Real-Time B Data to a Bus
L
L
X
H/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/L
X
H
X
Input
Output
Stored A Data to B Bus


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