DSA00315308.pdf by ROHM

Partial File 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
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3.58MHz crystal XTAL 350Hz 440hz BU8877 BU8877F IDD21 telephone dial tone detect