CD74HC652 Datasheet, PDF (3/12 Pages) Texas Instruments – High-Speed CMOS Logic Octal-Bus Transceiver/Registers, Three-State

Functional Diagram
OE_AB
L
L
X
H
L
L
L
L
OE_BA
H
H
H
H
X
L
L
L
4
A0
5
A1
6
A2
7
A
A3
DATA
8
PORT A4
9
A5
10
A6
11
A7
20
B0
19
B1
18
B2
17
B3 _B
16
DATA
B4 PORT
15
B5
14
B6
13
B7
21
OE_{BA 3}
OE_{AB 1}
FLIP-FLOP
CLOCKS
CAB CLOCK
23
CBA CLOCK
DATA
SOURCE
SELECTION
INPUTS
2
SAB SOURCE
22
SBA SOURCE
GND = PIN 12
V_CC = PIN 24
FUNCTION TABLE
INPUTS
DATA I/O
OPERATION OR FUNCTION
CAB CBA SAB SBA A0 THRU A7 B0 THRU B7
651
652
H or L H or L
X
X
Input
Input
Isolation (Note 3) Isolation (Note 3)
↑
↑
X
X
Store A and B Data Store A and B Data
↑
H or L
X
X
Input
Unspecified
(Note 4)
Store A, Hold B
Store A, Hold B
↑
↑
X
X
(Note 5)
Input
Output
Store A in Both
Registers
Store A in Both
Registers
H or L
↑
X
X
Unspecified
Input
Hold A, Store B
Hold A, Store B
(Note 4)
↑
↑
X
X
Output
(Note 5)
Input
Store B in Both
Registers
Store B in Both
Registers
X
X
X
L
Output
Input
Real-Time B Data to Real-Time B Data to
A Bus
A Bus
X
H or L
X
H
Stored B Data to A Stored B Data to A
Bus
Bus