74lvt16646 Fairchild Semiconductor, 74lvt16646 Datasheet - Page 2

• Manufacturer Part Number: 74lvt16646
• Description: Low Voltage 16-bit Transceiver/register With 3-state Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Connection Diagram
Truth Table
(Note 1)
H
X

L
Note 1: 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. Also applies to data I/O (A and B: 8-15) and #2 control
pins.
LOW Voltage Level
HIGH Voltage Level
Immaterial
LOW-to-HIGH Transition.
OE
H
H
H
L
L
L
L
L
L
L
L
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
H
H
X
X
X
X
L
L
X
1
SBA
X
X
X
X
X
X
X
H
H
L
L
1
Output
Input
Input
A
0–7
Data I/O
2
Pin Descriptions
A
B
CPAB
SAB
OE
DIR
Output Clock A
0
0
Input
Input
B
Pin Names
–A
–B
1
n
0–7
, OE
n
15
15
, SBA
n
, CPBA
2
Isolation
Clock A
Clock B
A
A Register to B
Clock A
B
Clock B
B Register to A
Clock B
n
n
n
to B
to A
n
n
n
n
n
n
n
n
n
Data Register A Inputs/3-STATE Outputs
Data Register B Inputs/3-STATE Outputs
Clock Pulse Inputs
Select Inputs
Output Enable Inputs
Direction Control Inputs
—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)
Description
n
n