SI2457-D-FSR

Overview

The Skyworks Solutions SI2457-D-FSR 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 an F-grade commercial temperature range of 0°C to +70°C. It utilizes a 16-pin SOIC package and communicates via SPI or UART interfaces. The total supply current is typically 17 mA, with power-down current below 80 µA. It integrates a direct access arrangement (DAA) for global telephone line interfacing.

Feature Summary

• Integrated Direct Access Arrangement (DAA) providing capacitive isolation and global compliance without external transformers or relays.
• Supports multiple host interface modes including SPI, UART, and parallel connections for flexible system integration.
• Capable of automatic rate negotiation across ITU-T and Bell standards from 300 bps to 56 kbps.
• Includes Type I and II caller ID decode functionality and DTMF detection/generation capabilities.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Ensure compatibility with the required Si3018/10 line-side device for complete chipset operation. Confirm that the F-grade temperature rating meets the environmental requirements of the target application before finalizing procurement.

Selection Notes

Select this component when a compact, single-chip solution for PSTN connectivity is required. The 16-pin option minimizes board space compared to the 24-pin variant. Verify that the host processor supports the necessary SPI or UART timing parameters. Consider the integrated DAA benefits if reducing bill-of-materials count by eliminating discrete analog components is a priority.

Part Context

This part belongs to the Skyworks ISOmodem family, which includes the Si2457, Si2434, Si2415, and Si204 models. These devices serve as the system-side counterpart to the Si3018/10 line-side devices. The family provides programmable telephone line interfaces with varying data rate capabilities, supporting protocols from basic 300 bps up to high-speed V.90 modulation.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult the manufacturer's obsolescence notices or application notes for potential cross-references within the same product family.