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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).
Dimension(Units:mm)
BU8877
Features 1) No malfunction by voice signal 2...