SI2457-D-FTR

Overview

The Skyworks SI2457-D-FTR is a system-side ISOmodem network controller processor IC designed for embedded applications. It supports data rates up to 56 kbps using V.90 protocols and operates with a digital supply voltage (VD) ranging from 3.0 V to 3.6 V, typically at 3.3 V. The device features UART, SPI, or parallel host interfaces and utilizes flexible clocking options including 32.768 kHz, 4.915 MHz, or 27 MHz inputs. It integrates a Direct Access Arrangement (DAA) providing over 6000 V capacitive isolation and is available in a 16-pin SOIC package.

Feature Summary

• Integrated Direct Access Arrangement (DAA) eliminates the need for external transformers, relays, opto-isolators, and hybrid circuits.
• Supports comprehensive modem protocols including ITU-T V.90, V.34, V.32bis, V.22bis, and Bell standards with automatic rate negotiation.
• Provides multiple host interface options including UART, SPI, and parallel modes for flexible CPU integration.
• Includes Type I and II caller ID decode capabilities and DTMF detection/generation functions.

Applications

• Set-top boxes
• Point-of-sale terminals
• Text and video telephones
• Digital video recorders
• Remote monitoring systems

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific revision suffix matches design requirements. Check for moisture sensitivity level handling procedures during storage and assembly. Ensure compatibility with the paired line-side Si3018 device for complete chipset functionality.

Selection Notes

Select this model when V.90 56 kbps download speeds are required, as lower models like Si2434 support only up to 33.6 kbps. Choose the F-grade variant for commercial temperature ranges (0°C to 70°C) or G-grade for industrial ranges (-40°C to 85°C). Verify that the 16-pin SOIC package footprint aligns with the PCB layout constraints compared to the 24-pin TSSOP option.

Part Context

The SI2457 belongs to the ISOmodem family of system-side devices, which also includes the Si2434, Si2415, and Si2404. These components function as part of a chipset architecture, pairing with line-side devices such as the Si3018 or Si3010 to form a complete modem solution. This family emphasizes high integration by combining DSP, controller, codec, and analog front-end functions into a single system-side IC.

Replacement Considerations

Publicly confirmed substitutes include other revisions within the same datasheet family, such as the Si2457-FT or Si2457-FS, provided the package type and temperature grade match the application requirements. Cross-model replacements like the Si2434 are possible if reduced speed capabilities are acceptable.