74LVT646D 查看數據表（PDF） - Philips Electronics
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74LVT646D Datasheet PDF : 14 Pages
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Philips Semiconductors
3.3V Octal bus transceiver/register (3-State)
Product specification
74LVT646
REAL TIME BUS TRANSFER REAL TIME BUS TRANSFER
BUS B TO BUS A
BUS A TO BUS B
STORAGE FROM
A, B, OR A AND B
TRANSFER STORED DATA
TO A OR B
A
B
A
B
A
B
A
B
OE DIR CPAB CPBA SAB SBA
L LXXXL
OE DIR CPAB CPBA SAB SBA
L HX X L X
OE DIR CPAB CPBA SAB SBA
LH↑XXX
L LX↑XX
HX ↑ ↑ XX
OE DIR CPAB CPBA SAB SBA
L L X H or L X H
L H H or L X H X
SV00049
FUNCTION TABLE
INPUTS
OE
DIR
CPAB CPBA
SAB SBA
DATA I/O
An
Bn
OPERATING MODE
X
X
↑
X
X
X
Input
Unspecified
output*
Store A, B unspecified
X
X
X
↑
X
X
Unspecified
output*
Input
Store B, A unspecified
H
H
X
↑
↑
X
X
X
H or L H or L
X
X
Input
Input
Store A and B data
Isolation, hold storage
L
L
L
L
X
X
X
X
L
H or L
X
H
Output
Input
Real time B data to A bus
Stored B data to A bus
L
L
H
X
X
H
H or L
X
L
X
H
X
Input
Output
Real time A data to B bus
Stored A data to B bus
H = High voltage level
L = Low voltage level
X = Don’t care
↑ = Low-to-High clock transition
*
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.
1998 Feb 19
4
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