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74LV161 Arkusz danych(PDF) 4 Page - NXP Semiconductors

Numer części 74LV161
Szczegółowy opis  Presettable synchronous 4-bit binary counter; asynchronous reset
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74LV161 Arkusz danych(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74LV161
Presettable synchronous 4-bit binary counter;
asynchronous reset
1997 May 15
4
FUNCTION TABLE
OPERATING MODES
INPUTS
OUTPUTS
OPERATING MODES
MR
CP
CEP
CET
PE
Dn
Qn
TC
Reset (clear)
L
X
X
X
X
X
L
L
Parallel load
H
X
X
I
I
L
L
Parallel load
H
X
X
I
h
H
*
Count
H
h
h
h
X
Count
*
Hold (do nothing)
H
X
I
X
h
X
qn
*
Hold (do nothing)
H
X
X
I
h
X
qn
L
NOTES:
*
=
The TC output is HIGH when CET is HIGH and the counter is at terminal count (HHHH)
H =
HIGH voltage level
h
=
HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition
L
=
LOW voltage level
I
=
LOW voltage level level one set-up time prior to the LOW-to-HIGH clock transition
q
=
lower case letters indicate the state of the referenced output one set-up time prior to the LOW-to-HIGH clock transition
X =
don’t care
↑ =
LOW-to-HIGH clock transition
STATE DIAGRAM
SV00573
0
1
2
3
4
5
6
7
8
9
10
11
12
15
14
13
TYPICAL TIMING SEQUENCE
SV00574
MR
PE
D 0
D 1
D 2
D 3
CP
CEP
CET
Q 0
Q 1
Q 2
Q 3
TC
reset
preset
count
inhibit
13
14
15
0
1
2
12
Typical timing sequence: reset outputs to zero; preset to binary twelve;
count to thirteen, fourteen, fifteen, zero, on and two; inhibit.


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