SI2493-C-GTR

Overview

The SI2493-C-GTR is a system-side component of the ISOmodem chipset family, designed for ITU V.92-compliant embedded modem applications. It operates on a digital supply voltage (VD) ranging from 3.0V to 3.6V and supports ambient temperatures from -40°C to 85°C (G-grade). The device integrates a DSP data pump, modem controller, codec, and Direct Access Arrangement (DAA), eliminating the need for external discrete components. It provides connect rates up to 56 kbps downstream and 48 kbps upstream over the PSTN. Communication with the host processor is supported via UART, SPI, or parallel interfaces. The G-grade variant utilizes a 24-pin TSSOP package.

Feature Summary

• Integrated Direct Access Arrangement (DAA) technology providing global telephone line interface compliance without external transformers or opto-isolators.
• Supports comprehensive protocol suite including ITU-T V.92, V.90, V.34, V.42bis, MNP error correction, and data compression.
• Flexible host connectivity options including asynchronous serial (UART), synchronous SPI, and 8-bit parallel interface.
• Built-in caller ID decoding, DTMF detection/generation, and firmware upgradeability.

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 temperature grade and packaging format. Confirm compatibility with the corresponding line-side device, such as the Si3018, as the datasheet validity depends on listed chipset combinations. Ensure the selected variant aligns with the necessary host interface requirements, particularly regarding parallel interface availability on the 24-pin option.

Selection Notes

Select the 24-pin TSSOP package if parallel interface, EEPROM interface, or voice codec connectivity is required, as these are exclusive to this footprint. Choose the G-grade version for industrial temperature ranges (-40°C to 85°C); otherwise, the F-grade covers commercial ranges. Verify clocking requirements against available oscillator options, including 32.768 kHz, 4.9152 MHz, or 27 MHz inputs.

Part Context

The SI2493 serves as the system-side controller within the ISOmodem architecture, working in tandem with the Si3018 line-side device. This chipset configuration replaces traditional discrete modem designs by integrating the DSP, controller, codec, and analog front-end into a compact solution. The device is part of a broader family that includes variants like the SI2493-D, differing primarily in temperature ratings and package styles.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer's official cross-reference guides or application notes for validated replacements.