SI2493-C-FS

Overview

The SI2493-C-FS is a system-side Data Access Arrangement (DAA) modem integrated circuit manufactured by Skyworks Solutions Inc. It belongs to the ISOmodem family and supports V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, and Bell 212A protocols. The device operates on a single 3V to 3.6V power supply and utilizes a 24-pin TSSOP package with a width of 4.40mm. Communication with a host processor is facilitated through UART, parallel, or SPI interfaces. The component includes an internal DSP, ROM, RAM, and EEPROM interface capabilities.

Feature Summary

• Integrated hardware modem solution combining controller, DSP, and DAA functions
• Supports multiple global telecommunications standards including FCC and ETSI
• Provides isolation via high-voltage capacitors instead of transformers
• Includes programmable AC/DC termination and ring impedance

Applications

• Telephone answering machines
• Handset and speakerphone operation
• Electronic point of sale (EPOS) systems
• Security protocol implementations such as SIA

Procurement Notes

Verify the specific revision suffix against current Skyworks documentation to confirm pinout and feature availability. Confirm RoHS compliance status prior to integration, as older revisions may not meet current environmental regulations. Ensure the selected package variant matches the intended PCB layout constraints for the 24-pin TSSOP form factor.

Selection Notes

Select this component when a complete hardware-based modem solution is required without external DSP processing. Verify that the host processor supports one of the available interface modes: UART, parallel, or SPI. Consider the power supply voltage range of 3V to 3.6V during system design. Evaluate the need for external EEPROM if persistent configuration storage is required beyond the internal memory.

Part Context

This part is part of the Si2493/57/34/15/04 ISOmodem chipset family designed for low-voltage applications. It pairs with line-side DAA devices like the Si3018 to connect directly to telephone local loops. The family is engineered to replace traditional transformer-based isolation methods with capacitor technology, simplifying the hardware design while maintaining compliance with international safety standards.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.