SI2457-D-GT

Overview

The Skyworks SI2457-D-GT 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 on a digital supply voltage (VD) ranging from 3.0 V to 3.6 V. The device features UART, SPI, or parallel host interfaces and utilizes a default clock input frequency of 4.9152 MHz, with support for 27 MHz or 32.768 kHz options. It integrates a Direct Access Arrangement (DAA) providing over 6000 V capacitive isolation and functions within an ambient temperature range of -40 °C to +85 °C for the G-grade variant.

Feature Summary

• Integrated Direct Access Arrangement (DAA) with global line interface compliance
• Supports ITU-T V.90, V.34, and V.32bis modem protocols
• Flexible clocking options including low-cost oscillator inputs
• Firmware upgradeable via EEPROM interface

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 datasheet to confirm package type and grade. Confirm that the intended application environment aligns with the specified operating temperature range. Ensure compatibility with the required Si3018/10 line-side chipset combination as defined in the documentation.

Selection Notes

Select this component when a compact, integrated solution for PSTN connectivity is required without external DSPs or transformers. Verify that the host system supports the available interface modes (UART, SPI, or Parallel). Confirm that the power supply constraints match the 3.0 V to 3.6 V digital supply requirement.

Part Context

The SI2457-D-GT belongs to the ISOmodem family, which pairs with the Si3018/10 line-side device. This chipset architecture eliminates the need for separate codecs, hybrid circuits, and opto-isolators. The 'G' suffix indicates the industrial temperature grade (-40 °C to +85 °C), while the 'D' denotes the revision level.

Replacement Considerations

Publicly confirmed substitutes include other members of the ISOmodem family such as the SI2434, SI2415, and SI2404, provided they meet the specific protocol and packaging requirements.