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74F269 데이터시트(PDF) 3 Page - NXP Semiconductors

부품명 74F269
상세설명  8-bit bidirectional binary counter
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74F269 데이터시트(HTML) 3 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74F269
8–bit bidirectional binary counter
1996 Jan 05
3
LOGIC SYMBOL
U/D
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
1
24
11
P0
P1
P2
P3
P4
P5
P6
P7
23456
89
10
23
22
21
20
18
17
16
15
14
TC
12
13
PE
CEP
CET
CP
VCC=Pin 19
GND=Pin 7
SF00835
LOGIC SYMBOL (IEEE/IEC)
SF00836
&
G5
EN6
24
M1[LOAD]
23
22
21
20
18
17
16
15
M4[DOWN]
1
13
12
11
2, 3, 5, 6 +/C7
2, 4, 5, 6–
M2[COUNT]
M3[UP]
[1]
[2]
[4]
[8]
[16]
[32]
[64]
[128]
3, 5, 6 CT=256
4, 5, 8 CT=0
14
2
3
4
5
6
8
9
10
CTR DIV 256
1, 7D
APPLICATION
U/D
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
P0 P1 P2 P3 P4 P5 P6 P7
TC
PE
CEP
CET
CP
SF00851
U/D
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
P0 P1 P2 P3 P4 P5 P6 P7
TC
PE
CEP
CET
CP
U/D
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
P0 P1 P2 P3 P4 P5 P6 P7
TC
PE
CEP
CET
CP
U/D
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
P0 P1 P2 P3 P4 P5 P6 P7
TC
PE
CEP
CET
CP
Most significant 8-bit counter
Least significant 8-bit counter
CP
U/D
PE
Figure 1. Synchronous Multistage Counting Scheme
MODE SELECT FUNCTION TABLE
INPUTS
OUTPUTS
OPERATING MODE
CP
U/D
CEP
CET
PE
Pn
Qn
TC
OPERATING MODE
X
X
X
l
l
L
(a)
Parallel load
X
X
X
l
h
H
(a)
Parallel load
h
l
l
h
X
Count Up
(a)
Count Up
l
l
l
h
X
Count Down
(a)
Count Down
X
h
l
h
X
qn
(a)
Hold (do nothing)
X
X
h
h
X
qn
H
Hold (do nothing)
H = High voltage level
h = High voltage level one setup prior to the Low-to-High clock transition
L = Low voltage level
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
(a) = TC is Low when CET is Low and the counter is at Terminal Count. Terminal Count Up is with all Qn outputs High and Terminal Count
Down is with all Qn outputs Low.


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