SI2435-E-FTR

Modems - ICS And Modules Overview

The SI2435-E-FTR is a V.34 fax modem IC from the ISOmodem family, manufactured by Skyworks Solutions Inc. It operates on a 3.0V to 3.6V digital supply voltage and supports data rates up to 33,600 bps over the Public Switched Telephone Network (PSTN). The component utilizes a 24-pin TSSOP package with surface mount installation. It integrates a direct access arrangement (DAA), DSP, modem controller, codec, and clocking circuitry, eliminating the need for external isolation transformers or relays. The device supports serial UART and parallel interfaces.

Modems - ICS And Modules Feature Summary

• Integrated silicon direct access arrangement (DAA) providing global telephone line interface compliance without external isolation components
• Supports ITU-T V.34 half duplex fax protocols with automatic rate negotiation and super G3 capabilities
• Includes built-in caller ID detection for multiple global standards and DTMF tone generation/detection
• Features firmware upgradeability and low-power modes including wake-on-ring sleep and complete powerdown

Modems - ICS And Modules Applications

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

Modems - ICS And Modules Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and tape-and-reel configuration. Ensure compatibility with the required clock source frequency, as the device supports both crystal and master clock inputs. Confirm that the design accommodates the necessary external passive components listed in the typical application schematic for proper loop characteristics and signal integrity.

Modems - ICS And Modules Selection Notes

Select this component for applications requiring a compact, globally compliant fax modem solution with minimal external bill of materials. Consider the integrated DAA technology which reduces board space compared to discrete solutions. Verify interface requirements, as the device supports both serial UART and parallel 8-bit data buses, selectable via hardware configuration during reset.

Modems - ICS And Modules Part Context

The SI2435 is part of the ISOmodem chipset family, designed alongside the Si2417. While the Si2417 is limited to 14.4 kbps, the Si2435 supports higher speeds up to 33.6 kbps and includes V.8 call establishment features. This chipset represents a third-generation direct access arrangement solution aimed at replacing traditional multi-chip fax modem designs.

Modems - ICS And Modules Replacement Considerations

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