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MC145443B - Single-Chip 300-Baud Modem

Download the MC145443B datasheet PDF. This datasheet also covers the MC145442B variant, as both devices belong to the same single-chip 300-baud modem family and are provided as variant models within a single manufacturer datasheet.

General Description

ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to VSS) Rating Supply Voltage DC Input Voltage DC Output Voltage Clamp Diode Current, per Pin DC Output Current, per Pin Power Dissipation Operating Temperature Range Storage Temperature Range Symbol VDD Vin Vout IIK, IOK Iout PD TA Tstg Value

Key Features

  • es for the selected mode. (See Tables 1 and 2 and Figures 4c and 4d. ) When LB is connected to analog ground (VAG), the modulator generates an echo cancellation tone of 2100 Hz for MC145442B CCITT V.21 and 2225 Hz for MC145443B Bell 103 systems. For normal operation, this pin should be at a logic low level (VSS). The power.
  • down mode is enabled when both LB and SQT are connected to a logic high level (see Table 2). Table 2. Functional Table MODE Pin 13 1 0 X X X X X SQT Pin 14 0 0 0 0 1 1.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (MC145442B_Motorola.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
MC145443 Single-Chip 300-Baud Modem
MC145442 Single-Chip 300-Baud Modem
MC145442B Single-Chip 300-Baud Modem
MC145444 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.

View original datasheet text
MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145442B/D Single-Chip 300-Baud Modem The MC145442B and MC145443B silicon–gate CMOS single–chip low– speed modems contain a complete frequency shift keying (FSK) modulator, demodulator, and filter. These devices are compatible with CCITT V.21 (MC145442B) and Bell 103 (MC145443B) specifications. Both devices provide full–duplex or half–duplex 300–baud data communication over a pair of telephone lines. They also include a carrier detect circuit for the demodulator section and a duplexer circuit for direct operation on a telephone line through a simple transformer. • • • • • • • • • • • • • • • MC145442B Compatible with CCITT V.