74ABT648 データシートの表示（PDF） - NXP Semiconductors.
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74ABT648 Datasheet PDF : 19 Pages
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Philips Semiconductors
74ABT648
Octal transceiver/register; inverting; 3-state
Table 3:
Symbol
SBA
CPBA
VCC
Pin description …continued
Pin
Description
22
B to A select input
23
B to A clock input
24
supply voltage
7. Functional description
7.1 Function table
Table 4: Function table [1]
Operating mode
Input
OE
DIR
Store A or B
Store A, B unspecified
X
X
Store B, A unspecified
X
X
Store A and B
Store A and B data
H
X
Isolation, hold storage
H
X
B data to A bus
Real time B data to A bus L
L
Stored B data to A bus
L
L
A data to B bus
Real time A data to B bus L
H
Stored A data to B bus
L
H
Data I/O
CPAB CPBA SAB
SBA
An
Bn
↑
X
X
X
input
unspecified
output [2]
X
↑
X
X
unspecified input
output [2]
↑
↑
X
X
input
H or L H or L X
X
input
X
X
X
L
output
input
X
H or L X
H
X
X
L
X
input
H or L X
H
X
output
[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.
9397 750 14858
Product data sheet
Rev. 04 — 27 April 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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