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74ABT646A Datasheet PDF : 19 Pages
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NXP Semiconductors
74ABT646A
Octal bus transceiver/register; 3-state
6. Functional description
Table 3.
Inputs
OE
X
Function table[1]
DIR
CPAB
X
↑
CPBA
X
SAB
X
X
X
X
↑
X
H
X
↑
↑
X
H
X
H or L H or L X
L
L
X
X
X
L
L
X
H or L X
L
H
X
X
L
L
H
H or L X
H
SBA
X
X
X
X
L
H
X
X
Data I/O
Operating mode
An
Bn
input
unspecified store A, B unspecified
output[2]
unspecified input
output[2]
store B, A unspecified
input
input
store A and B data
input
input
isolation, hold storage
output
input
real time B data to A bus
output
input
stored B data to A bus
input
output
real time A data to B bus
input
output
stored A data to B bus
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
↑ = LOW-to-HIGH clock transition;
[2] The data output function may be enabled or disabled by various signals at the OE input. Data input functions are always enabled,
i.e. data at the bus pins will be stored on every LOW-to-HIGH transition of the clock.
74ABT646A_3
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 03 — 15 March 2010
© NXP B.V. 2010. All rights reserved.
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