74LCX16646 Datasheet, PDF (2/10 Pages) Fairchild Semiconductor – Low Voltage 16-Bit Transceiver/Register with 5V Tolerant Inputs and Outputs

Connection Diagram
Truth Table
(Note 2)
OE₁
DIR₁
Inputs
CPAB₁ CPBA₁ SAB₁
SBA₁
Data I/O
A_0–7 B_0–7
Output Operation Mode
H
H
H
X
X
X
H or L
 _{ X}
H or L
X
X
X
X
L
L
H
H
^X
X
X
L
L
L
L
H
H
^{H or L}
X
X
H
H
L
L
L
L
X
X
^X
X
X
L
L
L
L
X
X
^{H or L}
X
X
 ^{H = HIGH Voltage Level}
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Transition.
X
Isolation
X
Input Input Clock A_n Data into A Register
X
Clock B_n Data Into B Register
X
A_n to B_n — Real Time (Transparent Mode)
X
Input Output Clock A_n Data to A Register
X
A Register to B_n (Stored Mode)
X
Clock A_n Data into A Register and Output to B_n
L
B_n to A_n — Real Time (Transparent Mode)
L Output Input Clock B_n Data into B Register
H
B Register to A_n (Stored Mode)
H
Clock B_n into B Register and Output to A_n
Note 2: 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.
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