SI2404-C-FSR

Overview

The Skyworks SI2404-C-FSR is a system-side component of the ISOmodem family, designed for embedded modem applications. It supports data rates up to 33.6 kbps and operates with a digital supply voltage (VD) ranging from 3.0 V to 3.6 V. The device features UART, SPI, or parallel host interfaces and utilizes flexible clock options including 32.768 kHz, 4.915 MHz, or 27 MHz inputs. It integrates a Direct Access Arrangement (DAA) providing over 6000 V capacitive isolation and global line interface compliance. The F-grade variant supports an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrated Direct Access Arrangement (DAA) eliminates external DSP, codec, transformer, relay, opto-isolators, and hybrid components.
• Supports multiple host communication protocols including UART, SPI, and parallel interfaces.
• Provides globally-compliant telephone line interface with over 6000 V capacitive isolation barrier.
• Firmware upgradeable capability with support for AT command sets and SMS/MMS.

Applications

• Set-top boxes
• Point-of-sale terminals
• Text and video telephones
• Digital video recorders
• Remote monitoring systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and grade. Confirm that the intended application environment falls within the specified commercial temperature limits for the F-grade device. Ensure compatibility with the required Si3018/10 line-side chipset combination as listed in the official datasheet ordering guide.

Selection Notes

Select this model when a compact solution is required for PSTN connectivity without external discrete analog components. Verify that the host processor can support the chosen interface mode (UART, SPI, or Parallel). Ensure the design accommodates the necessary crystal oscillator frequencies and meets the power supply requirements for the VD pin.

Part Context

This component belongs to the ISOmodem family, which includes the Si2457, Si2434, and Si2415 variants. These devices share similar packaging and interface characteristics but differ in supported maximum data rates and protocol versions. The SI2404 specifically targets applications requiring speeds up to 33.6 kbps.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult the official datasheet for compatible chipset combinations and potential obsolescence notices.