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CD74FCT652EN 데이터시트(PDF) 2 Page - Texas Instruments

부품명 CD74FCT652EN
상세설명  BiCMOS FCT Interface Logic, Octal Bus Transceivers/Registers, Three-State
Download  11 Pages
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CD74FCT652EN 데이터시트(HTML) 2 Page - Texas Instruments

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Functional Diagram
TRUTH TABLE
INPUTS
DATA I/O
OPERATION OR FUNCTION
OEAB OEBA
CAB
CBA
SAB
SBA
A0 THRU A7
B0 THRU B7
CD74FCT651
CD74FCT652
L
L
H
H
H or L
H or L
X
X
X
X
Input
Input
Input
Input
Isolation (Note 1)
Store A and B Data
Isolation (Note 1)
Store A and B Data
X
H
H
H
H or L
X
X (3)
X
X
Input
Input
Unspecified (2)
Output
Store A, Hold B
Store A in both registers
Store A, Hold B
Store A in both registers
L
L
X
L
H or L
X
X
X
X (3)
Unspecified (2)
Output
Input
Input
Hold A, Store B
Store B in both registers
Hold A, Store B
Store B in both registers
L
L
L
L
X
X
X
H or L
X
X
L
H
Output
Output
Input
Input
Real-Time B Data to A Bus
Stored B Data to A Bus
Real-Time B Data to A Bus
Stored B Data to A Bus
H
H
H
H
X
H or L
X
X
L
H
X
X
Input
Input
Output
Output
Real-Time A Data to B Bus
Stored A Data to B Bus
Real-Time A Data to B Bus
Stored A Data to B Bus
H
L
H or L H or L
H
H
Output
Output
Stored A Data to B Bus
Stored B Data to A Bus
Stored A Data to B Bus
Stored B Data to A Bus
NOTES:
1. To prevent excess currents in the High-Z (isolation) modes, all I/O terminals should be terminated with 10k
Ω to 1MΩ resistors.
2. The data output functions may be enabled or disabled by various signals at the 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.
3. Select control = L; clocks can occur simultaneously. Select control = H; clocks must be staggered in order to load both registers.
4
5
6
7
8
9
10
11
20
19
18
17
16
15
14
13
B0
B1
B2
B3
B4
B5
B6
B7
A0
A1
A2
A3
A4
A5
A6
A7
B DATA PORT
A DATA PORT
OEBA
OEAB
CAB CLOCK
CBA CLOCK
21
3
1
23
2
22
SAB SOURCE
SBA SOURCE
DATA SOURCE
SELECTION
INPUTS
FLIP-FLOP
CLOCKS
GND = PIN 12
VCC = PIN 24
CD74FCT651, CD74FCT652


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