74HC166 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/HCT166
Fig.4 Functional diagram.
FUNCTION TABLE
OPERATING MODES
PE
parallel load
I
I
serial shift
h
h
hold “do nothing”
X
CE
I
I
I
I
h
INPUTS
CP
↑
↑
↑
↑
X
D_S
X
X
I
h
X
D₀-D₇
I-I
h-h
X-X
X-X
X-X
Q_n REGISTER
Q₀
L
H
Q₁-Q₆
L-L
H-H
L
q₀ - q₅
H
q₀ - q₅
q₀
q₁ - q₆
Notes
1. H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
q = lower case letters indicate the state of the referenced output one set-up time prior to the
LOW-to-HIGH CP transition
X = don’t care
↑ = LOW-to-HIGH CP transition
OUTPUT
Q₇
L
H
q₆
q₆
q₇
December 1990
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