CD74FCT843A Datasheet, PDF (2/6 Pages) Texas Instruments – BiCMOS FCT Interface Logic, 9-Bit Transparent Latches, Three-State

Functional Diagram
CD74FCT843A, CD74FCT844A
D0
D1
D2
D3
D4
D5
D6
D7
D8
LE
PRE
2
3
4
5
6
7
8
9
10
13 14
23
22
21
20
19
18
17
16
15
1 11
843A 844A
Y0 Y0
Y1 Y1
Y2 Y2
Y3 Y3
Y4 Y4
Y5 Y5
Y6 Y6
Y7 Y7
Y8 Y8
CLR
OE
GND = PIN 12
V_CC = PIN 24
CLR
PRE
H
H
H
H
H
H
H
H
H
H
H
L
L
H
L
L
L
H
H
L
NOTE:
1. H= HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
NC = No Change
Z = High Impedance
TRUTH TABLE (Note 1)
INPUTS
OE
LE
H
X
H
L
L
H
L
H
L
L
L
X
L
X
L
X
H
L
H
L
843A
Dn
X
X
L
H
X
X
X
X
X
X
844A
Dn
X
X
H
L
X
X
X
X
X
X
OUTPUTS
Yn
FUNCTION
Z
High Z
Z
Latched (High Z)
L
Transparent
H
Transparent
NC
Latched
H
Preset
L
Clear
H
Preset
Z
Latched (High Z)
Z
Latched (High Z)
8-2