BU8871F データシートの表示（PDF） - ROHM Semiconductor

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BU8871F

DTMF receiver for telephones

ROHM Semiconductor 

Communication ICs

BU8871F

This LSI is not equipped with the power-on reset function. Also, since the internal circuit (flip-flop circuit) becomes unsta-

ble at the rising edge of the power supply, the internal circuit is initialized as shown below by the first DTMF sequence

received after the rising edge of the power supply. Therefore, input four dummy ACK pulses before the DTMF reception.

FElectrical characteristic curves

189

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