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74LCX16646MTD View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
Manufacturer
74LCX16646MTD Datasheet PDF : 10 Pages
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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 (SABn, SBAn) controls can multiplex
stored and real-time. The examples shown below demon-
strate the four fundamental bus-management functions
that can be performed.
The direction control (DIRn) determines which bus will
receive data when OEn is LOW. In the isolation mode (OEn
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
OE DIR CPAB CPBA SAB SBA
LL X
X XL
Transfer Storage
Data to A or B
OE DIR CPAB CPBA SAB SBA
LH X
X LX
Storage
OE DIR CPAB CPBA SAB SBA
L L X H or L X H
L H H or L X H X
OE DIR CPAB CPBA SAB SBA
 L H
X LX
 L X X
XL
 H X
X XX
 H X X
XX
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