SI2457-D-FT

Overview

The SI2457-D-FT 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, alongside V.34 and lower standards. The device operates on a digital supply voltage (VD) ranging from 3.0 V to 3.6 V with a typical current consumption of 173 mA. It utilizes an SPI or UART interface for host communication and accepts clock inputs at 4.9152 MHz, 27 MHz, or 32.768 kHz. The component is housed in a 16-pin SOIC package and is rated for commercial operation between 0°C and +70°C.

Feature Summary

• Integrated direct access arrangement (DAA) providing global telephone line interface compliance without external transformers or relays.
• Supports standard AT command sets with firmware upgradeability via EEPROM interface.
• Includes Type I and II caller ID decode capabilities and DTMF detection/generation functions.
• Eliminates the need for separate DSP, modem controller, codec, and hybrid components through high integration.

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 'FT' corresponds to the tape and reel packaging configuration required for automated assembly processes. Confirm that the 'D' grade designation aligns with the intended commercial temperature range specifications for the target application environment before finalizing procurement orders.

Selection Notes

Select this model when a compact system-side solution is required for embedded modem applications utilizing V.90 technology. Ensure the design accommodates the necessary Si3018/10 line-side chipset combination to complete the ISOmodem architecture. Verify that the host processor supports the specified SPI or UART interface timing requirements for reliable data exchange.

Part Context

This component belongs to the Skyworks ISOmodem family, which integrates modem functionality into a small footprint. It is designed to work in conjunction with specific line-side devices like the Si3018. The datasheet applies to Revision D of the Si2457/34/15/04 series, indicating specific electrical characteristics and pin assignments defined in this documentation version.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult official Skyworks Solutions documentation for potential obsolescence notices or recommended alternative components within the same product family.