74lcx32646 Fairchild Semiconductor, 74lcx32646 Datasheet - Page 3

• Manufacturer Part Number: 74lcx32646
• Description: Voltage 32-bit Transceiver/register With Tolerant Inputs Outputs Preliminary
• Manufacturer: Fairchild Semiconductor

Truth Table
(Note 3)
H
L

X
Note 3: Data I/O paths (1A and 1B: 0 - 7) is shown. This also applies to data I/O (1A and 1B: 8 - 15) and #2 control pins, to data (2A and 2B: 0 - 7) and #3
control pins, to data (2A and 2B: 8 - 15) and #4 control pins.
Note 4: The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled;
i.e., data at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs.
OE
LOW Voltage Level
H
H
H
HIGH Voltage Level
Immaterial
L
L
L
L
L
L
L
L
LOW-to-HIGH Transition
1
DIR
X
X
X
H
H
H
H
L
L
L
L
1
CPAB
H or L
H or L



X
X
X
X
X
X
Inputs
1
CPBA
H or L
H or L



X
X
X
X
X
X
1
SAB
X
X
X
H
H
X
X
X
X
L
L
1
SBA
X
H
H
X
X
X
X
X
X
L
L
1
Data I/O (Note 4)
Output
1A
Input
Input
0–7
3
Output
1B
Input
Input
0–7
Isolation
Clock A
Clock B
A
Clock A
A Register to B
Clock A
B
Clock B
B Register to A
Clock B
n
n
to B
to A
n
n
n
n
n
n
n
n
— Real Time (Transparent Mode)
— Real Time (Transparent Mode)
Data into A Register
Data Into B Register
Data to A Register
Data into A Register and Output to B
Data into B Register
into B Register and Output to A
Output Operation Mode
n
n
(Stored Mode)
(Stored Mode)
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Preliminary
n
n