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参数资料
| 型号： | SN54LS490FK |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 计数器 |
| 英文描述： | LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CQCC20 |
| 封装： | CERAMIC, LCC-20 |
| 文件页数： | 2/9页 |
| 文件大小： | 147K |
| 代理商： | SN54LS490FK |
SN54LS490, SN74LS490
DUAL 4-BIT DECADE COUNTERS
SDLS125A – OCTOBER 1976 – REVISED JULY 1998
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
BCD COUNT SEQUENCE
(each counter)
COUNT
OUTPUTS
COUNT
QD
QC
QB
QA
0
L
1
L
LL
H
2
L
LH
L
3
L
LH
H
4
L
HL
L
5
L
HLH
6
L
HH
L
7
L
HH
H
8
H
LL
L
9
H
L
H
logic symbol
CTRDIV10
CT=0
2
1CLR
CT=9
4
1SET9
1
1CLK
+
3
0
5
6
7
3
14
2CLR
12
2SET9
15
2CLK
13
11
10
9
CT
1QA
1QB
1QC
1QD
2QA
2QB
2QC
2QD
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, N, and W packages.
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