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MSM6947

1200 bps Single Chip FSK MODEM

Oki Electric Industry 

¡ Semiconductor

MSM6927/6947

Both MSM6927RS (or GS-K) and MSM6947RS (or GS-K) have 28 (or 44) pins. The pin descriptions

for these 28 (or 44) pins are same except those for No. 27 (or No. 36) pin and No. 28 (or No. 38).

The pin descriptions for No. 27 (or No. 36) pin and No. 28 (or No. 38) pin are described as follows.

MSM6927

Name

TS1

TS2

Pin No.

I/O

RS GS-K

27 36 I

28 38 I

Description

RS/CS delay and carrier detect delay options referred to chapter about timing

characteristics are selected by TS1 and TS2 inputs. Be careful that each delay

can not be individually selected. If another delay time than the ones within the

device are required as an option, input a digital "High" to the TS1 and TS2 pin

and implement the external delay circuits to obtain the desired delay

characteristics. In this case, the CD2 pin becomes not only the input for the

external circuit output signal, but also the Carrier detect output. See Fig. 11-1.

MSM6947

Name

TS

ATE

Pin No.

I/O

RS GS-K

27 36 I

28 38 I

Description

When a digital "Low" is input to the TS pin, the built-in RS/CS, carrier detect and

receiver-squelch delay are provided. If another delay time is required, it can be

implemented by inputting a digital "High" to this pin and incorporates the external

delay circuits. In this case, the CD2 pin becomes not only the input for the

external circuit output signal, but also the Carrier detect output. See Fig. 11-2.

Answer tone enable input. When a digital "Low" is input to this pin and the RS1

pin is in the digital "Low" level, the Answer Tone (to 2025 Hz) is sent over the

phone line via the AO pin.

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