SI2435-D-FTR

Modems - ICS And Modules Overview

The SI2435-D-FTR is a system-side ISOmodem fax modem integrated circuit manufactured by Skyworks Solutions Inc. It operates within a digital supply voltage range of 3.0 V to 3.6 V and supports data transmission speeds from 14,400 bps to 33,600 bps over the Public Switched Telephone Network (PSTN). The component utilizes a 24-pin TSSOP package with a width of 4.40 mm. It features an asynchronous UART interface supporting baud rates up to 307.2 kbps or an 8-bit parallel interface. The device includes an integrated Direct Access Arrangement (DAA) providing over 6000 V capacitive isolation and supports ITU-T V.34, V.17, V.29, V.27ter, and V.21 protocols.

Modems - ICS And Modules Feature Summary

• Integrated silicon Direct Access Arrangement (DAA) eliminates the need for external isolation transformers, relays, opto-isolators, and hybrid circuits.
• Supports global telephone line compliance through programmable DC termination, AC termination, ringer impedance, and ringer threshold settings.
• Includes built-in caller ID decoding for multiple international standards including Bellcore, ETSI, UK, and Japanese protocols.
• Provides comprehensive DTMF tone generation and detection capabilities alongside data/fax/voice call discrimination.

Modems - ICS And Modules Applications

• Fax machines
• Fax telephones
• Multifunctional printers
• Fax servers

Modems - ICS And Modules Procurement Notes

Verify that the specific ordering suffix matches the required tape-and-reel packaging configuration. Confirm the revision level against the manufacturer's latest documentation to ensure compatibility with existing firmware and hardware designs. Check for any recent product change notices regarding pinout or electrical specifications before finalizing procurement orders.

Modems - ICS And Modules Selection Notes

Select this component when a compact, globally compliant fax modem solution is required without external DSP or codec components. Ensure the host microcontroller can support either the serial UART or parallel 8-bit interface modes. Verify that the application environment stays within the specified operating temperature range of 0 °C to 70 °C for the F-Grade variant.

Modems - ICS And Modules Part Context

This part belongs to the ISOmodem family developed originally by Silicon Laboratories and later acquired by Skyworks Solutions. It is designed as a complete two-chip chipset solution intended to replace discrete analog and digital modem components. The SI2435 variant specifically supports V.34 half-duplex faxing at speeds up to 33.6 kbps, distinguishing it from lower-speed counterparts in the series.

Modems - ICS And Modules Replacement Considerations

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