HT9170B_02 Ver la hoja de datos (PDF) - Holtek Semiconductor
Número de pieza
componentes Descripción
Fabricante
HT9170B_02 Datasheet PDF : 13 Pages
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VDD
H T 9 1 7 0 B /D
R T /G T
EST
V DD
C
R
(a) Fundamental circuit:
tGTP = R ´ C ´ Ln (VDD / (VDD - VTRT))
tGTA = R ´ C ´ Ln (VDD / VTRT)
V DD
VDD
H T 9 1 7 0 B /D
R T /G T
EST
C
R1
D1 R2
HT9170B/HT9170D
VDD
H T 9 1 7 0 B /D
R T /G T
EST
V DD
C
R1
D1 R2
(c) tGTP > tGTA :
tGTP = R1 ´ C ´ Ln (VDD / (VDD - VTRT))
tGTA = (R1 // R2) ´ C ´ Ln (VDD / VTRT)
(b) tGTP < tGTA :
tGTP = (R1 // R2) ´ C ´ Ln (VDD - VTRT))
tGTA = R1 ´ C ´ Ln (VDD / VTRT)
Figure 5. Steering time adjustment circuits
DTMF dialing matrix
C O L1 C O L2 C O L3 C O L4
ROW 1 1
2
3
A
ROW 2 4
5
6
B
ROW 3 7
8
9
C
ROW 4 *
0
#
D
DTMF data output table
Low Group (Hz)
High Group (Hz)
Digit
OE
D3
697
1209
1
H
L
697
1336
2
H
L
697
1477
3
H
L
770
1209
4
H
L
770
1336
5
H
L
770
1477
6
H
L
852
1209
7
H
L
852
1336
8
H
H
852
1477
9
H
H
941
1336
0
H
H
941
1209
*
H
H
941
1477
#
H
H
697
1633
A
H
H
770
1633
B
H
H
852
1633
C
H
H
941
1633
D
H
L
¾
¾
ANY
L
Z
Note: ²Z² High impedance; ²ANY² Any digit
Rev. 1.10
7
D2
D1
D0
L
L
H
L
H
L
L
H
H
H
L
L
H
L
H
H
H
L
H
H
H
L
L
L
L
L
H
L
H
L
L
H
H
H
L
L
H
L
H
H
H
L
H
H
H
L
L
L
Z
Z
Z
September 24, 2002
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