Philips Semiconductors
Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state
AC WAVEFORMS
74HC/HCT574
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.6
Waveforms showing the clock input (CP)
pulse width, the CP input to output (Q
n
)
propagation delays, the output transition
times and the maximum clock pulse
frequency.
Fig.7
Waveforms showing the 3-state enable and
disable times.
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”.
The shaded areas indicate when the input is permitted
to change for predictable output performance.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.8
Waveforms showing the data set-up and
hold times for D
n
input to CP input.
December 1990
7
PHILIPS [ NXP SEMICONDUCTORS ]
