SI2494-A-GM 56 kbps V.92 Modem IC | Skyworks Solutions
N.º da peça: SI2494-A-GM ✓ AtivoSI2494-A-GM Visão geral
A data modem IC converts serial data into modulation formats suitable for analog telephone, fax, and legacy WAN connections. The SI2494-A-GM belongs to the controller and processor class of integrated circuits, combining protocol handling, caller-ID decoding, rate negotiation, and host-interface control in one device. Its system-side architecture is intended for embedded equipment that connects a host processor to an analog line interface.
Key capabilities include operation up to 56 kbps under V.92, support for V.42 and V.42bis error correction, MNP2-5 automatic rate negotiation, V.92 PCM upstream operation, and Type I and Type II caller-ID decoding. The host can connect through UART, SPI, or a parallel interface, allowing integration with different embedded controller architectures. The chip also accepts flexible clocking options and can use a low-cost 32.768 kHz oscillator.
The SI2494-A-GM avoids external ROM or RAM for its modem functions, reducing the number of supporting components required around the data path. Bell 300 bps operation and the broader ITU-T format set preserve compatibility with older terminal equipment, while V.92 support enables higher-rate analog data sessions where the connected line and service support it.
Typical applications include industrial data terminals, point-of-sale systems, remote-access equipment, fax machines, telephone-interface gateways, and embedded modem modules. The 38-QFN package is suitable for compact surface-mount assemblies, but careful treatment of the exposed thermal pad and high-speed clock and interface routing is important for dependable operation.
Design the supply, analog-line interface, clock source, and host interface according to the manufacturer reference schematic. Keep the exposed-pad connection unobstructed, follow the recommended decoupling arrangement, and validate timing margins across all three supported host-interface modes. Firmware must also select the correct regional modem profile, negotiated rate, and V.92 capability.
This product guide combines the confirmed modem features, package information, interface choices, and application guidance with practical replacement and design context. Use the manufacturer datasheet pin-description table and reference circuit when assigning PCB tracks and selecting external analog-line components.
Alternativas drop-in para SI2494-A-GM — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
SI2494-A-GMR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI2439-A-GM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI2494-A-GM Especificações
| Product Type | System-side ISOmodem data communications controller |
| Maximum Data Rate | 56 kbps |
| ITU-T Modem Formats | V.21, V.22, V.29, V.32, V.34, V.42, V.42bis, V.44, and V.92 |
| Bell Format | Bell 300 bps |
| V.92 PCM Upstream | Supported |
| Fast Connect | Supported |
| V.92 Quick Connect | Supported |
| Automatic Rate Negotiation | MNP2-5 |
| Caller ID | Type I and Type II decode |
| Host Interfaces | UART, SPI, and parallel |
| External ROM or RAM | Not required |
| Clock Options | Flexible clock options |
| Low-Cost Crystal Frequency | 32.768 kHz |
| Encapsulamento | 38-pin QFN with exposed pad, 5 mm x 7 mm |
| Tipo de montagem | Surface mount |
Guia de Configuração de Pinos do SI2494-A-GM 38-pin qfn with exposed pad, 5 mm x 7 mm
Configuração de pinos para SI2494-A-GM (pacote 38-pin qfn with exposed pad, 5 mm x 7 mm). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para SI2494-A-GM.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
SI2494-A-GM é adequado para 6 aplicaçãos: Industrial Remote-Access Terminal, Point-of-Sale Data Terminal, Legacy Fax and Terminal Gateway, Telephone-Line Data Adapter, Embedded Modem Module, Fax Machine Controller Board.
Industrial Remote-Access Terminal
The SI2494-A-GM fits an industrial terminal that must connect an embedded controller to an analog telephone line while retaining support for older services. Its 56 kbps V.92 capability provides a higher-rate option than legacy Bell 300 bps operation, while MNP2-5 handles automatic rate negotiation. UART, SPI, and parallel interfaces let the terminal use its existing host architecture. The system must also include the manufacturer-recommended line interface, protection network, clock arrangement, and exposed-pad layout.
Recomendado
Point-of-Sale Data Terminal
A point-of-sale terminal can use the SI2494-A-GM when centralized services must be reached over an analog line and compatibility with legacy calling equipment remains important. The controller supports Bell 300 bps through V.92 operation, Fast Connect, V.92 Quick Connect, and MNP2-5, allowing the firmware to negotiate a suitable rate. A parallel host interface may suit a controller-oriented design, while UART or SPI can simplify connection to a compact embedded platform. Line protection and regulatory approval remain system-level requirements.
Recomendado
Legacy Fax and Terminal Gateway
The SI2494-A-GM is appropriate for gateways that bridge an embedded host to legacy fax, terminal, or remote-maintenance equipment. Supporting Bell 300 bps alongside V.21, V.22, V.29, V.32, V.34, V.42, V.42bis, V.44, and V.92 allows the gateway to interoperate across multiple generations of modem service. Type I and Type II caller-ID decoding can support incoming-call identification. The analog front end, clock source, and host firmware must be configured around the desired calling and answering modes.
Recomendado
Telephone-Line Data Adapter
A telephone-line data adapter can combine the SI2494-A-GM’s modem protocol engine with a separate line-interface circuit to create a compact serial-to-analog-data bridge. The controller supports host connectivity through UART, SPI, or parallel interfaces, providing flexibility for different embedded systems. V.92 Quick Connect and Fast Connect can improve call establishment, while MNP2-5 automates compatible-rate selection. Because the chip is the system-side modem controller, the board must also implement the required telephone-line coupling, gain, filtering, and protection functions.
Recomendado
Embedded Modem Module
The SI2494-A-GM suits an embedded modem module designed to expose legacy analog-line data capability through a digital host interface. Its 38-QFN package with exposed pad supports compact surface-mount construction, and the absence of required external ROM or RAM can simplify module assembly. The module designer should preserve the manufacturer’s clock, decoupling, analog-interface, and thermal-land recommendations. Firmware should expose the V.92, Fast Connect, Quick Connect, caller-ID, and automatic-negotiation features through the product’s intended command set.
Recomendado
Fax Machine Controller Board
A fax-machine controller board can use the SI2494-A-GM when the design requires a broad set of ITU-T modem modes rather than a single narrow protocol. The combination of V.21, V.22, V.29, V.32, V.34, V.42, V.42bis, V.44, and V.92 supports legacy interoperability and error-corrected data operation. Flexible clock options and a supported 32.768 kHz oscillator source can assist board planning, while UART, SPI, and parallel host connections simplify integration with the fax image-processing controller.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SI2494-A-GM — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SI2494-A-GMR | SI2439-A-GM |
|---|---|---|---|
| Package | 38-pin QFN with exposed pad, 5 mm x 7 mm | 38-pin QFN with exposed pad, 5 mm x 7 mm | 38-pin QFN with exposed pad, 5 mm x 7 mm |
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Product Classification | Modem V.34, V.92 | Modem V.34, V.92 | Related modem controller |
Principais diferenciais
- Broad legacy-to-V.92 protocol coverage (vs SI2439-A-GM)
- Multiple embedded host-interface choices (vs SI2439-A-GM)
- No external ROM or RAM requirement (vs SI2439-A-GM)
Notas de projeto
Follow the manufacturer reference layout for the 38-pin QFN exposed-pad land, power connections, clock routing, and host interface. Place input and output decoupling capacitors close to their associated pins, use a continuous exposed-pad via pattern, and preserve the recommended copper area beneath the package. The exposed pad is not a numbered signal pin and should be connected according to the manufacturer’s ground and thermal guidance.
Keep the host clock, UART, SPI, and parallel traces away from the sensitive analog-line signals and the modem’s clock-source circuitry. Use short, direct return paths and a solid ground plane, and observe the manufacturer’s timing and trace guidance for the selected host interface. For SPI or parallel operation, verify signal-integrity margins at the highest supported host clock and during modem data activity.
Do not assume that a related modem-controller MPN is interchangeable without comparing its complete pin table, electrical limits, clock requirements, and protocol feature set. Likewise, distinguish the SI2494-A-GM ordering code from SI2494-A-GMR when validating tube, reel, orientation, labeling, and quantity requirements. Review the modem’s regional profile and negotiated operating mode before enabling V.92 in deployed firmware.
Informações de conformidade
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations were identified in the component records.
