SI2435-C-FTR

Overview

The SI2435-C-FTR is a V.34 fax modem IC from the ISOmodem family, manufactured by Skyworks Solutions Inc. It operates within a digital supply voltage range of 3.0 to 3.6 V and supports data rates up to 33,600 bps over the Public Switched Telephone Network (PSTN). The device integrates a direct access arrangement (DAA), DSP, modem controller, codec, and on-chip memory, eliminating the need for external components such as isolation transformers or relays. It features both UART serial and parallel interfaces for host communication. The component is housed in a 24-pin TSSOP package with a standard tape-and-reel packaging format.

Feature Summary

• Integrates a silicon-based direct access arrangement (DAA) for global telephone line interface compliance
• Supports ITU-T V.34 fax protocols with automatic rate negotiation up to 33.6 kbps
• Includes built-in caller ID detection for multiple international standards
• Provides DTMF tone generation and detection capabilities

Applications

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

Procurement Notes

Verify the specific suffix 'C-FTR' against official Skyworks documentation to confirm temperature grade and reel specifications. Ensure compatibility with the required clock source configuration, as the device supports both crystal and master clock inputs depending on the interface mode selected during initialization.

Selection Notes

Select this component for designs requiring a highly integrated fax solution with minimal external bill of materials. Confirm that the host microcontroller supports either the asynchronous UART or 8-bit parallel interface modes. Verify that the application environment remains within the specified operating temperature range for the F-grade variant.

Part Context

This part belongs to the ISOmodem chipset family, which pairs with the Si3018 DAA component. The SI2435 variant specifically supports V.34 half-duplex fax and V.8 call establishment, distinguishing it from the Si2417 which lacks these advanced protocol features. The chipset replaces traditional discrete modem architectures.

Replacement Considerations

The SI2417 is a related model within the same ISOmodem family but does not support V.34 half-duplex or V.8 call establishment. Other members of the ISOmodem family include the SI2457, SI2415, and SI2404, which offer different feature sets and modulation support.