74HCT191N,652 데이터 시트보기 (PDF) - NXP Semiconductors.
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74HCT191N,652 Datasheet PDF : 19 Pages
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Nexperia
74HC191
Presettable synchronous 4-bit binary up/down counter
5.2. Pin description
Table 2. Pin description
Symbol
D0, D1, D2, D3
Q0, Q1, Q2, Q3
CE
U/D
GND
PL
TC
RC
CP
Pin
15, 1, 10, 9
3, 2, 6, 7
4
5
8
11
12
13
14
VCC
16
Description
data input
flip-flop output
count enable input (active LOW)
up/down input
ground (0 V)
parallel load input (active LOW)
terminal count output
ripple clock output (active LOW)
clock input (LOW-to-HIGH, edge-
triggered)
supply voltage
6. Functional description
Table 3. Function table
H = HIGH voltage level; L = LOW voltage level; l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock
transition; X = don’t care; ↑ = LOW-to-HIGH clock transition
Operating mode Input
Output
PL
U/D
CE
CP
Dn
Qn
parallel load
L
X
X
X
L
L
L
X
X
X
H
H
count up
H
L
l
↑
X
count up
count down
H
H
l
↑
X
count down
Hold (do nothing) H
X
H
X
X
no change
Table 4. TC and RC Function table
H = HIGH voltage level; L = LOW voltage level; X = don’t care;
HIGH clock transition.
= one LOW level pulse;
Input
Terminal count state
U/D
CE
CP
Q0
Q1
Q2
Q3
H
H
X
H
H
H
H
L
H
X
H
H
H
H
L
L
H
H
H
H
= TC goes LOW on a LOW-to-
Output
TC
RC
L
H
H
H
L
H
X
L
L
L
L
L
H
H
H
X
L
L
L
L
H
H
H
L
L
L
L
L
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
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