Datasheet

December 1990 12
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
AC WAVEFORMS
Fig.10 Waveforms showing the clock (CP) to output (Q
n
) propagation delays, the clock pulse width and the
maximum clock pulse 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.11 Waveforms showing the clock and count enable inputs (CP, CE) to ripple clock output (RC) propagation
delays.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.12 Waveforms showing the input (D
n
) to output (Q
n
) propagation delays.
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= 1.3 V; V
I
= GND to 3 V.