74ABT16646 Fairchild Semiconductor, 74ABT16646 Datasheet - Page 2
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74ABT16646
Manufacturer Part Number
74ABT16646
Description
16-Bit Transceivers and Registers with 3-STATE Outputs
Manufacturer
Fairchild Semiconductor
Datasheet
1.74ABT16646.pdf
(9 pages)
Available stocks
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Manufacturer
Quantity
Price
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Part Number:
74ABT16646CSSCX
Manufacturer:
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Quantity:
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Function Table
H
L
X
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
OE
LOW-to-HIGH Transition
H
H
H
L
L
L
L
L
L
L
L
1
DIR
H
H
H
H
X
X
X
L
L
L
L
1
CPAB
Real Time Transfer
H or L
H or L
A-Bus to B-Bus
Bus to Register
X
X
X
X
X
X
Storage from
FIGURE 1.
FIGURE 3.
Inputs
1
CPBA
H or L
H or L
X
X
X
X
X
X
1
SAB
X
X
X
H
H
X
X
X
X
L
L
1
SBA
X
X
X
X
X
X
X
H
H
L
L
1
Data I/O (Note 1)
Output
A
Input
Input
0–7
2
Output
B
Input
Input
0–7
Isolation
Clock An Data into A Register
Clock Bn Data Into B Register
An to Bn—Real Time (Transparent Mode)
Clock An Data to A Register
A Register to Bn (Stored Mode)
Clock An Data into A Register and Output to Bn
Bn to An—Real Time (Transparent Mode)
Clock Bn Data into B Register
B Register to An (Stored Mode)
Clock Bn into B Register and Output to An
Real Time Transfer
B-Bus to A-Bus
Register to Bus
Output Operation Mode
Transfer from
FIGURE 2.
FIGURE 4.