Datasheet
September 1993 7
Philips Semiconductors Product speciļ¬cation
Octal D-type transparent latch; 3-state 74HC/HCT373
AC WAVEFORMS
Fig.7 Waveforms showing the input (D
n
) to output
(Q
n
) propagation delays and the output
transition times.
(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 latch enable input
(LE) pulse width, the latch enable input to
output (Q
n
) propagation delays and the
output transition times.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.9 Waveforms showing the 3-state enable and disable times.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.10 Waveforms showing the data set-up and hold times for D
n
input to LE input.
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.