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74HCT191N,652

P1-P3P4-P6P7-P9P10-P12P13-P14
December 1990 13
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
Fig.13 Waveforms showing the input (PL) 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.
Fig.14 Waveforms showing the up/down count input (U/D) to terminal count and ripple clock output (TC, 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.15 Waveforms showing the parallel load input (PL) pulse width, removal time to clock (CP) and the output
(Q
n
) 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.
December 1990 14
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
Fig.16 Waveforms showing the set-up and hold times from the parallel load input (PL) to the data input (D
n
).
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.17 Waveforms showing the set-up and hold times from the count enable and up/down inputs (CE, U/D) to the
clock (CP).
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.
P1-P3P4-P6P7-P9P10-P12P13-P14

74HCT191N,652

Mfr. #:
Buy 74HCT191N,652
Manufacturer:
NXP Semiconductors
Description:
Counter ICs SYNC BIN U/D COUNTER
Lifecycle:
New from this manufacturer.
Delivery:
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