MSM7715 データシートの表示（PDF） - Oki Electric Industry

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MSM7715

Multi-Function Telecommunication LSI

Oki Electric Industry 

¡ Semiconductor

TIMING DIAGRAM

When DTMF is received

tC

tI

tS

tP

AIN signal

tG

DT1 to 4

tD

MSM7715

tB

SP

tSP

Figure 1 DTMF Receive Timing

tS

: Tone time for detect

When the input signal duration is tS or more, receiving is normally done.

tI

: Tone time for no detect

When the input signal duration is tI or less, this input signal is ignored and DT1 to

DT4 and SP is not output.

tP

: Interdigit pause time

When there is no input signal for tP or more, DT1 to DT4 and SP are reset.

tB

: Acceptable drop out time

DT1 to DT4 and SP are not reset even though a no-signal state for tB or less

(momentary no-signal) occurs during signal receiving. The tB is applicable while

the received signals are output. (SP="1")

tSP

: SP delay time

Against the DT1 to DT4 output, SP is output after a delay of tSP. Therefore, latch DT1

to DT4 at the rising edge of SP.

tC

: Signal repetition time

For normal receiving, set the signal repetition time to tC or more.

tG1n

: Output delay time (n: 1 or 2)

Against the appearance of the input signal, DT1 to DT4 are outputs after a delay of

tG1n.

tD

: Output trailing edge delay time

Against the stop of the input signal, DT1 to DT4 and SP stop outputting after a delay

of tD.

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