SI2456-FTR

Overview

The SI2456-FTR is a V.90-compliant ISOmodem chipset manufactured by Skyworks Solutions Inc., operating at a maximum data rate of 56 kbps. It integrates a DSP, modem controller, RAM, ROM, analog front end, and a direct access arrangement (DAA) with over 5000 V capacitive isolation. The device supports ITU-T V.90, V.34, and V.32bis protocols, featuring automatic rate negotiation and caller ID decoding. Powered by a 3.3 V supply, it offers serial UART or parallel 8-bit interfaces and firmware upgradeability.

Feature Summary

• Integrated global DAA providing programmable line interface for worldwide PTT compliance
• Supports standard AT command set with automatic baud detection
• Capacitive isolation technology eliminates need for external transformers or relays
• Firmware upgradeable via EEPROM interface

Applications

• Set-top boxes
• E-mail terminals
• Point-of-sale terminals
• Digital video recorders
• Security systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with the required Si3015 companion component as defined in the datasheet's ordering guide. Confirm that the revision level matches the design requirements for global regulatory compliance.

Selection Notes

Select this model for applications requiring full V.90 56 kbps connectivity. Compare with the SI2433 for 33.6 kbps or SI2414 for 14.4 kbps if lower speeds suffice. Verify interface requirements; the device defaults to serial mode but supports parallel operation. Ensure the host system can accommodate the 3.3 V logic levels and power consumption characteristics specified in the electrical tables.

Part Context

The SI2456 belongs to the Silicon Laboratories ISOmodem family, which includes the SI2433 and SI2414 variants. These chips share identical pinouts and features but differ in maximum supported data rates. The chipset is designed to replace traditional discrete modem solutions by integrating the data pump, codec, and isolation components into a single compact package.

Replacement Considerations

Public confirmed substitute part numbers: SI2457.