75t204 ETC-unknow, 75t204 Datasheet - Page 4

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75t204

Manufacturer Part Number
75t204
Description
Low-power Subscriber Dtmf Receiver
Manufacturer
ETC-unknow
Datasheet

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75T204
5V Low-Power Subscriber
DTMF Receiver
DTMF DIALING MATRIX
See Figure 3. Please note that column 3 is for special applications and is not normally used in telephone dialing.
D1, D2,
Analog
D4, D8
Input
DV
Tone burst 1
tD
tS
ton
Row 0
Row 1
Row 2
Row 3
FIGURE 3: DTMF Dialing Matrix
FIGURE 4: Timing Diagram
Col 0
1
4
7
*
tR
Pause
tH
toff
Col 1
2
5
8
0
4
Col 2
3
6
9
#
Tone burst 2
Col 3
A
C
B
D

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