Philips Semiconductors
Product specification
8-bit parallel-in/serial-out shift register
74HC/HCT165
Fig.4 Functional diagram.
FUNCTION TABLE
OPERATING MODES
PL
parallel load
L
L
H
H
H
X
X
L
L
H
CE
X
X
↑
↑
X
INPUTS
CP
X
X
l
h
X
D
S
L
H
X
X
X
D
0
-D
7
L
H
L
H
q
0
Q
n
REGISTERS
Q
0
Q
1
-Q
6
L-L
H-H
q
0
-q
5
q
0
-q
5
q
1
-q
6
L
H
q
6
q
6
q
7
OUTPUTS
Q
7
H
L
q
6
q
6
q
7
Q
7
serial shift
hold “do nothing”
Note
1. H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition
q = lower case letters indicate the state of the referenced output one set-up time prior to the
LOW-to-HIGH clock transition
X = don’t care
↑
= LOW-to-HIGH clock transition
Fig.5 Logic diagram.
December 1990
4
PHILIPS [ NXP SEMICONDUCTORS ]
