SI2435-F-FTR

Overview

The SI2435-F-FTR is a system-side ISOmodem chipset manufactured by Skyworks Solutions Inc. (formerly Silicon Laboratories). It supports fax modem formats including V.34, V.17, V.29, V.27ter, and V.21 channel 2 with connect rates up to 33,600 bps. The device operates on a digital supply voltage of 3.0 to 3.6 V and functions within an ambient temperature range of 0 to 70 °C for the F-Grade variant. It integrates a direct access arrangement (DAA) and supports both UART serial and parallel interfaces.

Feature Summary

• Integrated silicon direct access arrangement (DAA) providing global telephone line interface compliance
• Supports automatic rate negotiation and V.8 call establishment for optimal operational mode selection
• Includes data/fax/voice discriminator and distinctive ring detection capabilities
• Firmware upgradeable with support for Class 1 AT command sets

Applications

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

Procurement Notes

Verify the specific suffix 'F' corresponds to the F-Grade operating temperature range (0 to 70 °C) as defined in the datasheet electrical specifications. Confirm that the '-FTR' designation indicates tape and reel packaging rather than tube or bulk packaging. Ensure compatibility with the Si3018 companion chip if utilizing the complete two-chip solution.

Selection Notes

Select this component for applications requiring embedded fax modem functionality without external DSPs or isolation transformers. The integrated DAA eliminates the need for discrete analog components. Verify interface requirements; the device defaults to serial UART mode but can be configured for parallel operation via the AOUT/INT pin during reset.

Part Context

This part belongs to the ISOmodem family, specifically designed as a complete two-chip fax modem solution. It is often paired with the Si3018 silicon DAA chip to form a compact system. The chipset replaces traditional modem designs that required separate codecs, controllers, and hybrid circuits.

Replacement Considerations

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