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74LVTH646 Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. 74LVTH646
Description  Low Voltage Octal Transceiver/Register with 3-STATE Outputs
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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74LVTH646 Datasheet(HTML) 3 Page - Fairchild Semiconductor

   
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Functional Description
In the transceiver mode, data present at the HIGH impedance 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 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 function 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
Transfer Storage
Data to A or B
Real-Time Transfer
Bus B to Bus A
Storage
OE
DIR
CPAB CPBA SAB SBA
LL
X
X
X
L
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
X
X
L
X
OE
DIR
CPAB CPBA SAB SBA
LH

XL
X
LL
X

XL
HX

XX
X
HX
X

XX


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