CD74FCT543 Datasheet, PDF (2/6 Pages) Texas Instruments – BiCMOS FCT Interface Logic, Octal Register/Transceiver, Three-State

Functional Diagram
A0
A1
A7
OEBA
CEBA
LEBA
CD74FCT543
DQ
LE
DETAIL A
B0
QD
LE
DETAIL A x 7
B1
B7
OEAB
CEAB
LEAB
TRUTH TABLE For A to B (Symmetric with B to A)
INPUTS
LATCH STATUS
CEAB
LEAB
OEAB
A TO B
H
X
X
Storing
X
H
−
Storing
X
-
H
-
L
L
L
Transparent
L
H
L
Storing
NOTE:
1. Before LEAB LOW to HIGH Transition
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
A to B data flow shown; B to A flow control is the same, except using CEBA, LEBA, and OEBA.
IEC Logic Symbol
CD74FCT543
OUTPUT BUFFERS
B0 THRU B7
High Z
-
High Z
Current A Inputs
Previous A Inputs (Note 1)
11
≥1
14
EN1
13
23
≥1
1
EN2
2
3
12
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
8-2