MC145446AFW

Overview

The MC145446AFW is a single-chip modem integrated circuit manufactured by Motorola. It supports FSK modulation and operates at a baud rate of 300. The device integrates a DTMF transceiver function, allowing for dual-tone multi-frequency signaling capabilities within the same package. This component is designed for telecommunications applications requiring compact interface solutions.

Feature Summary

• Integrates FSK modem functionality with DTMF transceiver capabilities on a single chip
• Supports 300-baud data transmission rates for standard telecommunications interfaces
• Provides a complete solution for modem and touch-tone signaling in compact form factors

Applications

• Telecommunications equipment requiring 300-baud data transmission
• Systems integrating DTMF dialing and modem communication functions
• Industrial control interfaces utilizing standard modem protocols

Procurement Notes

Verify the specific suffix 'AFW' against official Motorola or NXP documentation to confirm pinout compatibility and functional specifications. Ensure that the PDSO28 package dimensions match the target PCB footprint requirements. Cross-reference the datasheet revision history to validate electrical characteristics before integration into production designs.

Selection Notes

Select this component when a combined modem and DTMF transceiver solution is required for 300-baud applications. Consider the PDSO28 package size constraints and thermal dissipation needs. Evaluate if the integrated single-chip approach reduces bill-of-materials complexity compared to discrete modem and tone generator alternatives.

Part Context

This part belongs to the Motorola MC145446 series of single-chip modems. The series is characterized by its integration of both data transmission and touch-tone generation functions. These components were widely used in legacy telecommunications systems where space efficiency and functional integration were critical design priorities.

Replacement Considerations

Consult official Motorola/NXP substitution guides for direct replacements. Verify pin-to-pin compatibility and electrical parameter alignment with any alternative components. Ensure that the replacement maintains the required 300-baud FSK and DTMF functionality without necessitating circuit redesign.