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74LCX646MSA データシート(PDF) 3 Page - Fairchild Semiconductor

部品番号 74LCX646MSA
部品情報  Low Voltage Octal Transceiver/Register with 5V Tolerant Inputs and Outputs
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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

74LCX646MSA データシート(HTML) 3 Page - Fairchild Semiconductor

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Functional Description
In the transceiver mode, data present at the HIGH imped-
ance port may be stored in either the A or B register or
both. The select (SAB, SBA) controls can multiplex stored
and real-time. The examples shown below demonstrate the
four fundamental bus-management functions that can be
performed.
The direction control (DIR) determines which bus will
receive data when OE is LOW. In the isolation mode (OE
HIGH), A data may be stored in one register and/or B data
may be stored in the other register. When an output func-
tion is disabled, the input function is still enabled and may
be used to store and transmit data. Only one of the two
busses, A or B, may be driven at a time.
Real-Time Transfer
Bus B to Bus A
Real-Time Transfer
Bus A to Bus B
Transfer Storage
Data to A or B
Storage
OE DIR CPAB CPBA SAB SBA
LL
X
X
X
L
OE
DIR
CPAB CPBA
SAB
SBA
LH
X
X
L
X
OE
DIR
CPAB CPBA
SAB
SBA
LL
X
H or L
X
H
LH
H or L
X
H
X
OE
DIR
CPAB CPBA
SAB
SBA
LH

XL
X
LL
X

XL
HX

XX
X
HX
X

XX


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