74HC173 Datasheet, PDF (4/10 Pages) NXP Semiconductors – Quad D-type flip-flop; positive-edge trigger; 3-state

Philips Semiconductors
Quad D-type flip-flop; positive-edge trigger; 3-state
Product specification
74HC/HCT173
Fig.4 Functional diagram.
FUNCTION TABLE
REGISTER OPERATING MODES
reset (clear)
parallel load
hold (no change)
INPUTS
MR CP E₁ E₂ D_n
H X XX X
L↑ ll l
L↑ ll h
LX
LX
hX X
Xh X
OUTPUTS
Q_n (register)
L
L
H
q_n
q_n
3-STATE BUFFER OPERATING MODES
read
disabled
INPUTS
OUTPUTS
Q_n (register) OE₁ OE₂ Q₀ Q₁ Q₂ Q₃
L
L L LLLL
H
L L HHHH
X
H X ZZZZ
X
X H ZZZZ
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 input (or output)
one set-up time prior to the LOW-to-HIGH CP transition
X = don’t care
Z = high impedance OFF-state
↑ = LOW-to-HIGH CP transition
December 1990
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