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參數(shù)資料
| 型號： | HTC555DC |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | GENERAL PURPOSE CLOCK GENERATOR |
| 中文描述： | 一般用途的時鐘發(fā)生器 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 56K |
| 代理商： | HTC555DC |
HIGH TECH
CHIPS, INC.
01/04/00
2
With this application we can generate thirty-two different output frequencies. See output frequency
selection table for dip switch settings. Setting “Frequency Selection” dip switch sets frequency.
HTC555 reads input switch value constantly and output frequency is set per new value if D[0:4] inputs
are changed. Time that takes to change output frequency to new value is relative to period of
previous frequency setting. For example if HTC555 was generating 10000Hz clock and we changed it
to 25000Hz clock, then output frequency will change in 1/10000Hz or 100uS. In order to avoid output
glitches, HTC555 changes its output frequency after finishing current output period. R1-R5 value
could be in a range of 1K to 10K in this application. Please note that if only one frequency is needed
then we can connect D [0:4] pins directly to ground or VDD. C1 is used, as de-coupling capacitor and
could be omitted.
3.0 Pin out description.
Abbreviations used: O - output, I - input, P - power.
Pin number
1
2
3
4
5
6
7
8
Name
VDD
CLKOUT
D4
D3
D2
D1
D0
GND
I / O
P
O
I
I
I
I
I
P
Description
Power
Clock Output
Frequency selector input.
Frequency selector input.
Frequency selector input.
Frequency selector input.
Frequency selector input.
Ground
Notes
+2.5V to + 5.5V.
Output frequency.
Tie to GND or VDD.
Tie to GND or VDD.
Tie to GND or VDD.
Tie to GND or VDD.
Tie to GND or VDD.
Connect to ground.
Output Frequency Selection.
Abbreviations used: 0 – connection to GND, 1 – connection to VDD.
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
CLK ( output frequency)
1Hz
10 Hz
20 Hz
30 Hz
40 Hz
50 Hz
60 Hz
70 Hz
80 Hz
90 Hz
100 Hz
200 Hz
300 Hz
400 Hz
500 Hz
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