SI2435-F-FT

Modems - ICS And Modules Overview

The SI2435-F-FT is a system-side ISOMODEM 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 an ambient temperature range of 0 °C to 70 °C for the F-grade variant. The device provides fax connect rates up to 33,600 bps over the Public Switched Telephone Network (PSTN). It features a 24-pin TSSOP package and utilizes a UART or parallel interface for communication with host controllers.

Modems - ICS And Modules Feature Summary

• Integrated direct access arrangement (DAA) providing global telephone line interface compliance
• Supports ITU-T V.34 half duplex fax protocols with automatic rate negotiation
• Includes data/fax/voice discriminator and distinctive ring detection capabilities
• Firmware upgradeable with support for Class 1 AT command sets

Modems - ICS And Modules Applications

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

Modems - ICS And Modules Procurement Notes

Verify the specific suffix 'F' indicates the commercial temperature grade (0 to 70 °C) as defined in the datasheet electrical specifications. Confirm the 'FT' suffix corresponds to the tape and reel packaging format required for automated assembly processes before finalizing procurement orders.

Modems - ICS And Modules Selection Notes

Select this component for applications requiring a complete two-chip fax modem solution with minimal external components. Ensure the host controller supports either the asynchronous UART or 8-bit parallel interface modes. Verify that the design accommodates the necessary clocking requirements using either a 4.9152 MHz crystal or a 27 MHz master clock input.

Modems - ICS And Modules Part Context

This part belongs to the ISOmodem family developed originally by Silicon Laboratories and later acquired by Skyworks Solutions. The SI2435 represents the system-side chipset designed to pair with the subscriber-side Si2417. It eliminates the need for separate DSPs, codecs, and isolation transformers in traditional fax modem designs.

Modems - ICS And Modules Replacement Considerations

SI2438-A-FT is listed as a manufacturer-recommended substitute.