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參數(shù)資料
| 型號(hào)： | CD22859E |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Monolithic Silicon COS/MOS Dual-Tone Multifrequency Tone Generator |
| 中文描述： | TELEPHONE DIALER CKT, PDIP16 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 38K |
| 代理商： | CD22859E |
4-129
FIGURE 1. BELL AND NOMINAL OUTPUT FREQUENCIES (IN PARENTHESIS) FOR 3.579545MHz CRYSTAL
DTMF GENERATOR FUNCTIONAL TRUTH TABLE
KEYBOARD MODE
INPUTS
OUTPUTS
NUMBER OF
COLUMN INPUTS AC-
TIVATED “LOW”
NUMBER OF ROW IN-
PUTS ACTIVATED
“LOW”
CD
TONE
OSC RUN-
NING
R
X
T
X
X
X
X
“0”
None
No
“0”
“0”
No Key Depressed
0
0
“1”
None
No
“0”
“0”
0
1
“1”
Dual Tone R
A
, C
1
Yes
“1”
“1”
1, 2, 3, or 4
0
“1”
None
No
“0”
“0”
Normal Dialing
One Key Depressed
(Note 9)
1
1
“1”
Dual Tone R
A
, C
B
Yes
“1”
“1”
Two or More Keys In
Same Row
(Note 10)
2, 3, or 4
1
“1”
Single Row Tone R
A
Yes
“1”
“1”
Two or More Keys In
Same Column
1
2, 3, or 4
“1”
Single Column Tone
C
B
Yes
“1”
“1”
Two or More Keys In
Different Rows and
Columns
2, 3, or 4
2, 3, or 4
“1”
None
Yes
“1”
“1”
Where:
X = Don’t Care
R
A
refers to Tone Output frequencies corresponding to Row 1, Row 2, Row 3, Row 4; C
B
refers to Tone Output frequencies corresponding to
Column 1, Column 2, Column 3, Column 4.
A = 1, 2, 3, 4
B = 1, 2, 3, 4
A = B, or A
≠
B
1
2
3
A
B
C
D
6
9
#
5
8
0
4
7
*
COL 1
ROW 1
697 (699.1)
1209
(1215.9)
COL 2
COL 3
COL 4
ROW 2
ROW 3
ROW 4
1336
(1331.7)
1477
(1471.9)
1633
(1645.0)
770 (766.2)
852 (847.4)
941 (948.0)
NOMINAL
OUTPUT
FREQUENCY
CD22859
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