View bu8307cs datasheet:

Communication ICs Pulse / tone dialer for telephone set BU8307CS / BU8307CF The BU8307CS and BU8307CF are large scale integrated circuits with a pulse dialer and tone dialer integrated on a single chip. These products are capable of dialing in either pulse or tone mode, and can redial up to 32 digits. FApplications Telephones and cordless telephones FFeatures 1) The chip includes both a pu

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