74ABT16652 Fairchild Semiconductor, 74ABT16652 Datasheet - Page 3

• Manufacturer Part Number: 74ABT16652
• Description: 16-Bit Transceivers and Registers with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

Function Table
H
L

X
Note 1: The data output functions may be enabled or disabled by various signals at OEAB or OEBA inputs. Data input functions are always enabled, i.e.,
data at the bus pins will be stored on every LOW to HIGH transition on the clock inputs. This also applies to data I/O (A and B: 8–15) and #2 control pins.
Logic Diagrams
Please note that these diagrams are provided only for the understanding of logic operations and should not be used to estimate propagation delays.
LOW Voltage Level
HIGH Voltage Level
Immaterial
LOW to HIGH Clock Transition
OEAB
X
H
H
H
H
L
L
L
L
L
L
1
OEBA
H
H
H
H
H
H
X
L
L
L
L
1
CPAB
H or L
H or L
H or L
H or L




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




X
X
X
1
SAB
H
H
X
X
X
X
X
X
X
X
L
1
SBA
X
X
X
X
X
X
H
X
X
H
L
1
Input
Input
Input
Input
Not Specified Input
Output
Output
Output
A
Inputs/Outputs (Note 1)
3
0
thru A
7
Output
Input
Not Specified Store A, Hold B
Output
Input
Input
Output
B
0
thru B
7
Isolation
Store A and B Data
Store A in Both Registers
Hold A, Store B
Store B in Both Registers
Store B Data to A Bus
Real-Time A Data to B Bus
Stored A Data to B Bus
Stored A Data to B Bus and
Stored B Data to A Bus
Real-Time B Data to A Bus
Operating Mode
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