Datasheet

December 1990 7
Philips Semiconductors Product specification
Dual decade ripple counter 74HC/HCT390
AC WAVEFORMS
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines” .
Fig.6 Waveforms showing the clock (nCP
n
) to output (nQ
n
) propagation delays, the clock pulse width, the output
transition times and the maximum clock frequency.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.7 Waveforms showing the master reset (nMR) pulse width, the master reset to output (nQ
n
) propagation
delays and the master reset to clock (nCP
n
) removal time.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= 1.3 V; V
I
= GND to 3 V.