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74ALS161B Fiches technique(PDF) 6 Page - NXP Semiconductors

No de pièce 74ALS161B
Description  4-bit binary counter
Download  14 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ALS161B Fiches technique(HTML) 6 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ALS161B/74ALS163B
4-bit binary counter
1991 Feb 08
6
LOGIC DIAGRAM – 74ALS163B
D
CP
Q
Q
D
CP
Q
Q
D
CP
Q
Q
D
CP
Q
Q
14
Q0
13
Q1
12
Q2
11
Q3
15
TC
6
D3
5
D2
4
D1
3
D0
7
CEP
10
CET
9
PE
1
SR
2
CP
SF00663
VCC = Pin 16
GND = Pin 8
MODE SELECTION FUNCTION TABLE – 74ALS163B
INPUTS
OUTPUTS
OPERATING MODE
SR
CP
CEP
CET
PE
Dn
Qn
TC
OPERATING MODE
l
X
X
X
X
L
L
Reset (clear)
h
X
X
l
l
L
L
Parallel load
h
X
X
l
h
H
(a)
Parallel load
h
h
h
h
X
count
(a)
Count
h
X
l
X
h
X
qn
(a)
Hold (do nothing)
h
X
X
l
h
X
qn
L
Hold (do nothing)
H = High-voltage level
h
= High state must be present one setup time before the Low-to-High clock transition
L
= Low-voltage level
l
= Low state must be present one setup time before the Low-to-High clock transition
qn = Lower case letters indicate the state of the referenced output prior to the Low-to-High clock transition
X = Don’t care
(a) = The output is High when CET is High and the counter is at terminal count (HHHH)
↑ = Low-to-High clock transition


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