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參數(shù)資料
| 型號： | 933795210602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計數(shù)器 |
| 英文描述： | F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 8-BIT BIDIRECTIONAL BINARY COUNTER, PDIP16 |
| 封裝： | PLASTIC, SOT-38-4, DIP-16 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 110K |
| 代理商： | 933795210602 |
Philips Semiconductors
Product specification
74F779
8-bit bidirectional binary counter (3-State)
1989 Sep 20
3
LOGIC SYMBOL
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
15
16
123567
8
12
TC
9
14
OE
CET
CP
VCC=Pin 13
GND=Pin 4
SF01260
S0
S1
11
10
LOGIC SYMBOL (IEEE/IEC)
SF01261
EN4
11
15
14
9
[1]
[2]
[4]
[8]
[16]
[32]
[64]
[128]
4, 5, 8 CT=256
4, 5, 8 CT=0
12
16
1
2
3
5
6
7
8
CTR DIV 256
10
0
1
M
0
3
—
EN6
1–
2 +/C5
LOAD
DOWN
UP
HOLD
6
FUNCTION TABLE
INPUTS
OPERATING MODE
S1
S0
CET
OE
CP
X
H
X
I/O0 to I/O7 in High impedance
X
L
X
Flip-flop outputs appear on I/O lines
L
X
H
↑
Parallel load all flip-flops
(not LL)
H
X
↑
Hold (TC held High)
H
L
X
↑
Count up
L
H
L
X
↑
Count down
H = High voltage level
L = Low voltage level
X = Don’t care
↑ = Low-to-High clock transition
(not LL) = S0 and S1 should never be Low voltage level at the
same time in the hold mode only.
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