SI2457-C-GTR

Overview

The Skyworks SI2457-C-GTR 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. The device features UART, SPI, or parallel host interfaces and supports flexible clocking options including 32.768 kHz, 4.915 MHz, and 27 MHz inputs. It integrates a Direct Access Arrangement (DAA) providing over 6000 V capacitive isolation and global line interface compliance. The G-grade variant ensures operation across an extended temperature range of -40 °C to +85 °C.

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.44, and MNP standards with automatic rate negotiation.
• Firmware upgradeable via EEPROM interface and supports SMS/MMS functionality.
• Includes Type I and II caller ID decode, DTMF detection/generation, and parallel phone detection capabilities.

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the revision level against the manufacturer's current documentation to ensure compatibility with the intended Si3018/10 line-side chipset combination. Check for any product change notifications regarding pin assignments or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when a compact, single-chip solution for PSTN connectivity is required without external DSPs or codecs. Ensure the host system supports one of the available interfaces: UART, SPI, or parallel. Verify that the application environment falls within the specified operating temperature range for the selected grade. Confirm power supply stability within the 3.0 V to 3.6 V window for reliable loop current regulation.

Part Context

The SI2457-C-GTR belongs to the ISOmodem family of products, which includes the Si2434, Si2415, and Si2404 variants. These devices are designed as system-side components in a chipset architecture paired with the Si3018 or Si3010 line-side devices. The family utilizes patented direct access arrangement technology to provide a highly integrated telephone line interface suitable for various communication endpoints.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consider the Si2457-FS or other packaging variants within the same series if pinout compatibility is maintained. Consult official Skyworks Solutions documentation for potential obsolescence notices or recommended design alternatives.