74HC165 Datasheet, PDF (4/10 Pages) NXP Semiconductors – 8-bit parallel-in/serial-out shift register

Philips Semiconductors
8-bit parallel-in/serial-out shift register
Product specification
74HC/HCT165
Fig.4 Functional diagram.
FUNCTION TABLE
OPERATING MODES
INPUTS
Q_n REGISTERS
parallel load
serial shift
hold “do nothing”
PL
L
L
H
H
H
CE
X
X
L
L
H
CP
X
X
↑
↑
X
D_S
X
X
l
h
X
D₀-D₇
L
H
X
X
X
Q₀
L
H
L
H
q₀
Q₁-Q₆
L-L
H-H
q₀-q₅
q₀-q₅
q₁-q₆
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
OUTPUTS
Q₇
L
H
q₆
q₆
q₇
Q₇
H
L
q₆
q₆
q₇
December 1990
Fig.5 Logic diagram.
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