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    812 6V8A

    Abstract: BU8877 BU8877F Call Progress Tone generator
    Text: 99W121A Call Progress Tone Decoder for Telephone BU8877/F Description The BU8877 and BU8877F are ICs that detect dial tones from a call progress signal used in the telephone lines. The ICs detect dual signals 350Hz from 345 to 355Hz and 440Hz(from 435 to 445Hz).


    Original     		PDF 99W121A BU8877/F BU8877 BU8877F 350Hz 355Hz 440Hz 445Hz) BU8877 812 6V8A Call Progress Tone generator

    telephone dial tone detect

    Abstract: 350Hz IDD21 BU8877 BU8877F 440hz 3.58MHz crystal XTAL
    Text: 99W121A Call Progress Tone Decoder for Telephone BU8877/F Description The BU8877 and BU8877F are ICs that detect dial tones from a call progress signal used in the telephone lines. The ICs detect dual signals 350Hz from 345 to 355Hz and 440Hz(from 435 to 445Hz).


    Original     		PDF 99W121A BU8877/F BU8877 BU8877F 350Hz 355Hz 440Hz 445Hz) BU8877 telephone dial tone detect IDD21 3.58MHz crystal XTAL