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74LVC169D 数据表(PDF) 4 Page - NXP Semiconductors

部件名 74LVC169D
功能描述  Presettable synchronous 4-bit up/down binary counter
Download  14 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

74LVC169D 数据表(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74LVC169
Presettable synchronous 4-bit up/down
binary counter
1998 May 20
4
STATE DIAGRAM
0
123
4
5
6
7
8
9
10
11
12
13
14
15
COUNT DOWN
COUNT UP
SF00788
FUNCTION TABLE
OPERATING
INPUTS
OUTPUTS
MODES
CP
U/D
CEP
CET
PE
Dn
Qn
TC
Parallel load
(Dn
→Qn)
X
X
X
l
l
L
*
X
X
X
X
X
H
*
Count Up
(increment)
h
l
l
h
X
Count
Up
*
Count Down
(decrement)
l
l
l
h
X
Count
Down
*
Hold
(do nothing)
X
h
X
h
X
qn
*
X
X
X
h
X
qn
H
H = High voltage level steady state
h = High voltage level one setup time prior to the Low-to-High
clock transition
L = Low voltage level steady state
l
= Low voltage level one setup time prior to the Low-to-High
clock transition
q = Lower case letters indicate the state of the referenced output
prior to the Low-to-High clock transition
X = Don’t care
↑ = Low-to-High clock transition
*
= The TC is Low when CET is Low and the counter is at
Terminal Count.
Terminal Count Up is (HHHH) and Terminal Count Down is
(LLLL).
TYPICAL TIMING SEQUENCE
CP
PE
TC
MR
INHIBIT
COUNT
CEP
CET
D0
D2
D1
D3
Q0
Q2
Q1
Q3
RESET PRESET
12
13
14
15
0
1
2
SY00069
Typical timing sequence: reset outputs to zero; preset to binary
twelve; count to thirteen, fourteen, fifteen, zero, one, and two;
inhibit


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