74hct191 NXP Semiconductors, 74hct191 Datasheet - Page 13

• Manufacturer Part Number: 74hct191
• Description: Presettable Synchronous 4-bit Binary Up/down Counter
• Manufacturer: NXP Semiconductors

Philips Semiconductors
December 1990
Presettable synchronous 4-bit binary
up/down counter
(1) HC : V
Fig.14 Waveforms showing the up/down count input (U/D) to terminal count and ripple clock output (TC, RC)
(1) HC : V
Fig.15 Waveforms showing the parallel load input (PL) pulse width, removal time to clock (CP) and the output
(1) HC : V
HCT : V
HCT : V
HCT : V
propagation delays.
(Q
M
M
M
M
n
= 50%; V
= 1.3 V; V
= 50%; V
= 1.3 V; V
M
M
) transition times.
= 50%; V
= 1.3 V; V
Fig.13 Waveforms showing the input (PL) to output (Q
I
I
I
I
= GND to V
= GND to V
= GND to 3 V.
= GND to 3 V.
I
I
= GND to V
= GND to 3 V.
CC
CC
CC
.
.
.
13
n
) propagation delays.
74HC/HCT191
Product specification