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MC145444 - Single-Chip 300-Baud Modem

General Description

VCC Positive Power Supply (Pin 15) This pin is normally tied to the + 5.0 V.

A 0.1 µF decoupling capacitor should be used.

GND Ground Pin (Pin 5) This pin is normally tied to 0 V.

VSS) / 2.

Key Features

  • a 1.2 kΩ load resistor between Tx1 and Tx2. Attention must be set so as not to exceed this level when an external input is added to the DSI pin. A telephone line (600 Ω) is driven through an external 600 Ω resistor. In this case, the output level becomes about half of differential output. PIN.

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Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
MC145442 Single-Chip 300-Baud Modem
MC145442B Single-Chip 300-Baud Modem
MC145443 Single-Chip 300-Baud Modem
MC145443B Single-Chip 300-Baud Modem
MC145446A Single-Chip 300-Baud Modem with DTMF Transceiver

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145444/D MC145444 Advance Information Single-Chip 300-Baud Modem MC145444 is a silicon gate CMOS frequency shift keying (FSK) modem intended for use with telemeter systems or remote control systems over the telephone network. This device is compatible with CCITT V.21 and contains the entire circuit that provides a full–duplex or half–duplex 300–baud data communication over a pair of telephone lines. This device also includes the DTMF generator and call progress tone detector (CPTD). The differential line driver has the capability of driving 0 dBm into a 600 Ω load with a single + 5 V power supply. The transmit level is controlled by the programmable attenuator in 1 dB steps.