IDT54FCT2646AT データシートの表示（PDF） - Integrated Device Technology
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IDT54FCT2646AT Datasheet PDF : 9 Pages
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IDT54/74FCT646/2646/652/2652T/AT/CT/DT, 648T/AT/CT
FAST CMOS OCTAL TRANSCEIVER/REGISTER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FUNCTION TABLE (646/648)
Inputs
G DIR CPAB CPBA SAB SBA
H
X H or L H or L X
X
H
X
↑
↑
X
X
L
L
L
L
X
X
X
L
X H or L X
H
L
H
X
X
L
H H or L X
L
X
H
X
Data I/O(1)
A1 - A8
B1 - B8
Input
Input
Output
Input
Input
Output
Operation or Function
FCT646T/FCT2646T
FCT648T
Isolation
Isolation
Store A and B Data
Store A and B Data
Real-Time B Data to A Bus Real-Time B Data to A Bus
Stored B Data to A Bus Stored B Data to A Bus
Real-Time A Data to B Bus Real-Time A Data to B Bus
Stored A Data to B Bus Stored A Data to B Bus
2634 tbl 02
FUNCTION TABLE (652)
Inputs
GAB GBA CPAB CPBA SAB SBA
Data I/O
A1 - A8
B1 - B8
Operation or Function
FCT652T/FCT2652T
L
H H or L H or L X
X
Input
Input
Isolation
L
H
↑
↑
X
X
Store A and B Data
X
H
H
H
↑ H or L X
X
↑
↑
X(2)
X
Input
Input
Unspecified(1) Store A, Hold B
Output Store A in Both Registers
L
X H or L ↑
L
L
↑
↑
X
X Unspecified(1)
X
X(2)
Output
Input
Input
Hold A, Store B
Store B in Both Registers
L
L
L
L
X
X
X
L
X H or L X
H
Output
Input
Real-Time B Data to A Bus
Stored B Data to A Bus
H
H
X
X
L
X
Input
Output Real-Time A Data to B Bus
H
H H or L X
H
X
Stored A Data to B Bus
H
L H or L H or L H
H
Output
Output Stored A Data to B Bus and Stored B Data to A Bus
NOTES:
1. The data output functions may be enabled or disabled by various signals at the GAB or GBA 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.
2. Select control = L: clocks can occur simultaneously.
Select control = H: clocks must be staggered in order to load both registers.
H = HIGH, L = LOW, X = Don't Care, ≠ = LOW-to-HIGH transition.
3. A in B Register.
4. B in A Register.
2634 tbl 03
6.20
3
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