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74LCX16646 Datasheet(Hoja de datos) 2 Page - Fairchild Semiconductor

No. de Pieza. 74LCX16646
Descripción  Low Voltage 16-Bit Transceiver/Register with 5V Tolerant Inputs and Outputs
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Fabricante  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
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2
Connection Diagram
Truth Table
(Note 2)
H
= HIGH Voltage Level
X
= Immaterial
L
= LOW Voltage Level
 = LOW-to-HIGH Transition.
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.
Inputs
Data I/O
Output Operation Mode
OE1
DIR1
CPAB1 CPBA1
SAB1
SBA1
A0–7
B0–7
H
X
H or L
H or L
X
X
Isolation
H
X

X
X
X
Input
Input
Clock An Data into A Register
H
X
X

X
X
Clock Bn Data Into B Register
L
H
X
X
L
X
An to Bn — Real Time (Transparent Mode)
L
H

X
L
X
Input
Output Clock An Data to A Register
L
H
H or L
X
H
X
A Register to Bn (Stored Mode)
L
H

X
H
X
Clock An Data into A Register and Output to Bn
L
L
X
X
X
L
Bn to An — Real Time (Transparent Mode)
L
L
X

X
L
Output
Input
Clock Bn Data into B Register
L
L
X
H or L
X
H
B Register to An (Stored Mode)
L
L
X

X
H
Clock Bn into B Register and Output to An




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