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參數(shù)資料
| 型號： | SNJ54AS869FK |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 計數(shù)器 |
| 英文描述： | AS SERIES, SYN POSITIVE EDGE TRIGGERED 8-BIT BIDIRECTIONAL BINARY COUNTER, CQCC28 |
| 封裝： | CERAMIC, CC-24 |
| 文件頁數(shù)： | 22/24頁 |
| 文件大?。?/td> | 508K |
| 代理商： | SNJ54AS869FK |
SN54AS867, SN54AS869
SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869
SYNCHRONOUS 8-BIT UP/DOWN COUNTERS
SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
typical clear, preset, count, and inhibit sequences
The following sequence is illustrated below:
1.
Clear outputs to zero (SN74ALS867A and
′AS867 are asynchronous;
SN74ALS869 and
′AS869 are synchronous.)
2.
Preset to binary 252
3.
Count up to 253, 254, 255, 0, 1, and 2
4.
Count down to 1, 0, 255, 254, 253, and 252
5.
Inhibit
C
Async
Clear
D
E
F
CLK
ENP
ENT
QA
QB
QC
QD
RCO
Data
Inputs
Outputs
QE
QF
QG
QH
Count Down
G
H
B
A
S1
S0
Preset
Sync
Clear
252 253
255
254
255 254 253 252
01
21
0
Count Up
Inhibit
ENT and ENP both must be low for counting to occur.
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