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MC145442 - Single-Chip 300-Baud Modem

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

  • d. ) When LB is connected to analog ground (VAG), the modulator generates an echo cancellation tone of 2100 Hz for MC145442 CCITT V.21 and 2225 Hz for MC145443 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 1 LB Pin 2 0 0 VAG (VDD/2) 1 0 VAG (VDD/2) 1 Operating Mode Originat.

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Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
MC145442B Single-Chip 300-Baud Modem
MC145443 Single-Chip 300-Baud Modem
MC145443B Single-Chip 300-Baud Modem
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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 MC145442/D Single-Chip 300-Baud Modem The MC145442 and MC145443 silicon–gate CMOS single–chip low–speed modems contain a complete frequency shift keying (FSK) modulator, demodulator, and filter. These devices are with CCITT V.21 (MC145442) and Bell 103 (MC145443) 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. • • • • • • • • • • • • • • • MC145442 Compatible with CCITT V.