SI2457-C-FS

Overview

The SI2457-C-FS is a system-side ISOmodem network controller and processor IC manufactured by Skyworks Solutions. It supports data rates up to 56 kbps using V.90 protocols and operates with a supply voltage range of 3.0 V to 3.6 V, typically at 3.3 V. The device features SPI and UART interfaces and utilizes a 4.915 MHz clock frequency. It is housed in a 16-pin SOIC package designed for surface mounting (SMD/SMT). The component operates within a commercial temperature range of 0°C to +70°C and draws approximately 17 mA during standard operation.

Feature Summary

• Integrated direct access arrangement (DAA) technology providing global telephone line interface compliance without external transformers or relays.
• Supports comprehensive modem protocol standards including ITU-T V.90, V.34, V.32bis, and MNP error correction.
• Firmware upgradeable architecture allowing for feature updates via EEPROM interface.
• Includes Type I and II caller ID decode capabilities alongside DTMF detection and generation.

Applications

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

Procurement Notes

Verify the specific revision grade required for your application, as the datasheet distinguishes between F-grade (commercial) and G-grade (industrial) temperature ranges. Confirm that the 16-pin SOIC packaging aligns with your PCB land pattern requirements. Check current lifecycle status, as this component may be subject to discontinuation notices from the manufacturer.

Selection Notes

Select the SI2457-C-FS when a compact system-side solution is needed for embedded modems requiring V.90 support. Ensure the host processor can accommodate the SPI or UART interface timing specifications. Verify that the 3.3 V digital supply voltage matches the system power rails. Consider the integrated DAA benefits to reduce bill of materials compared to discrete solutions.

Part Context

This component belongs to the Skyworks ISOmodem family, which pairs system-side controllers like the SI2457 with line-side devices such as the Si3018. The chipset approach eliminates the need for separate DSPs, codecs, and hybrid circuits. The SI2457 specifically targets high-speed downstream data transmission over standard PSTN lines.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer's official obsolescence notices or engineering change orders for potential replacement recommendations.