SN74AVC16646
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES181F–DECEMBER 1998–REVISED JUNE 2005
FUNCTION TABLE
(EACH 8-BIT TRANSCEIVER/REGISTER)
INPUTS
DATA I/Os
OPERATION OR FUNCTION
OE
DIR
X
CLKAB
CLKBA
SAB
X
SBA
X
A1-A8
Input
B1-B8
Unspecified(1)
Input
X
X
H
H
L
↑
X
Store A, B unspecified(1)
Store B, A unspecified(1)
Store A and B data
X
X
↑
X
X
Unspecified(1)
X
↑
H or L
X
↑
H or L
X
X
X
Input
Input
X
X
X
Input disabled
Output
Input disabled
Input
Isolation, hold storage
Real-time B data to A bus
Stored B data to A bus
Real-time A data to B bus
Stored A data to B bus
L
X
L
L
L
X
H or L
X
X
H
Output
Input
L
H
H
X
L
X
Input
Output
L
H or L
X
H
X
Input
Output
(1) The data-output functions may be enabled or disabled by various signals at OE and DIR. Data-input functions always are enabled; i.e.,
data at the bus terminals is stored on every low-to-high transition of the clock inputs.
3
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