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參數(shù)資料
| 型號： | 933781130602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計(jì)數(shù)器 |
| 英文描述： | F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 8-BIT BIDIRECTIONAL BINARY COUNTER, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001, SOT-146-1, DIP-20 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 124K |
| 代理商： | 933781130602 |
Philips Semiconductors
Product specification
74F579
8-bit bidirectional binary counter (3-State)
2000 Dec 18
3
LOGIC SYMBOL
13
VCC = Pin 16
GND = Pin 6
34
5
7
8
9
10
1
18
SF01086
CEP
I/O0
I/O1
I/O4
I/O5
I/O6
I/O7
CP
CS
MR
SR
U/D
I/O2
I/O3
PE
12
20
19
14
2
17
11
OE
CET
15
TC
LOGIC SYMBOL (IEEE/IEC)
SF01087
1
3
4
5
2
8
9
10
7
1,2,3,4,
5,6,7,8
18
u1
EN3
2,5,7, +/C8
[1]
[2]
[4]
[8]
[16]
[32]
[64]
[128]
15
3,5,6,8 CT=256
3,4,6,8 CT=0
14
20
17
13
11
19
12
2,4,7–
R9
CTR DIV 256
&
M2[LOAD]
R1
1
&
EN6
1
G7
M4[DOWN]
M5[UP]
1
FUNCTION TABLE
INPUTS
OPERATING MODE
MR
SR
CS
PE
CEP
CET
U/D
OE
CP
X
H
X
I/O0 to I/O7 in high impedance (PE disabled)
X
L
H
X
H
X
I/O0 to I/O7 in high impedance
X
L
H
X
L
X
Flip-flop output appears on I/On lines
L
X
Asynchronous reset for all flip-flops
H
L
X
↑
Synchronous reset for all flip-flops
H
L
X
↑
Parallel load all flip-flops
H
(not LL)
H
X
↑
Hold
H
(not LL)
X
H
X
↑
Hold (TC held High)
H
(not LL)
L
H
X
↑
Count up
H
(not LL)
L
X
↑
Count down
H
=
High voltage level
L
=
Low voltage level
X
=
Don’t care
↑
=
Low-to-High clock transition
(not LL)
=
CS and PE should never be Low voltage level at the same time.
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