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74LVT16646 Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. 74LVT16646
Description  Low Voltage 16-Bit Transceiver/Register with 3-STATE Outputs
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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74LVT16646 Datasheet(HTML) 2 Page - Fairchild Semiconductor

   
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Connection Diagram
Pin Descriptions
Truth Table
(Note 1)
H
= HIGH Voltage Level
X
= Immaterial
L
= LOW Voltage Level
 = LOW-to-HIGH Transition.
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.
Pin Names
Description
A0–A15
Data Register A Inputs/3-STATE Outputs
B0–B15
Data Register B Inputs/3-STATE Outputs
CPABn, CPBAn Clock Pulse Inputs
SABn, SBAn
Select Inputs
OE1, OE2
Output Enable Inputs
DIRn
Direction Control Inputs
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
HX

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

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

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)
LH

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

X
H
Clock Bn into B Register and Output to An


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