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Start your designThe MC145443B is a silicon-gate CMOS single-chip, low-speed modem containing a complete frequency shift keying (FSK) modulator, demodulator, and filter. This device is compatible with Bell 103 specifications. The MC145443B provides full-duplex or half-duplex 300-baud data communication over a pair of telephone lines. It also includes a carrier detect circuit for the demodulator section and a duplexer circuit for direct operation on a telephone line through a simple transformer.
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