74HC191 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
74HC191 Datasheet PDF : 19 Pages
| |||
Nexperia
74HC191
Presettable synchronous 4-bit binary up/down counter
VI
PL input
GND
VI
CP input
GND
VM
tW
trec
VM
VOH
Qn output
VOL
tPHL
90 %
VM
10 %
10 %
tTHL
90 %
tTLH
aaa-024389
Measurement points are given in Table 9.
Logic levels VOL and VOH are typical output voltage levels that occur with the output load.
Fig. 15. The parallel load input (PL) to clock (CP) recovery times, parallel load pulse width and output
(Qn)transition times
Vl
CP input
VM
GND
Vl
CE, U/D input
tsu
th
VM
GND
Vl
tsu
th
CE, U/D input
VM
GND
aaa-024391
Measurement points are given in Table 9.
The shaded areas indicate when the input is permitted to change for predictable output performance.
Fig. 16. The count enable and up/down count inputs (CE, U/D) to clock input (CP) set-up and hold times
74HC191
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 5 October 2018
© Nexperia B.V. 2018. All rights reserved
12 / 18
Share Link: 