SI2493-D-FT - 56 kbps V.92 ISOmodem | Skyworks
料号： SI2493-D-FT ✓ 量产中SI2493-D-FT 概述
An ISOmodem is a complete integrated modem solution that combines data-path modulation, telephone-interface functions, and system-side control in one IC. In the telecommunications hierarchy, the SI2493-D-FT belongs to the modem-controller and network-interface class of integrated circuits. Its purpose is to let a host processor exchange synchronized digital data with a legacy analog telephone line without requiring a large collection of discrete codec, filter, and interface components.
The SI2493-D-FT supports ITU V.21, V.22, V.23, V.29, V.32, V.34, and V.90 operation, together with V.92 features. The Skyworks data sheet also identifies V.42bis, MNP2-5, automatic rate negotiation, V.92 PCM upstream, V.92 Quick Connect, and modem-on-hold capabilities. Bell 103 and Bell 212A compatibility broadens interoperability with older terminal equipment and network services.
Revision D represents the documented version of the SI2493 design used by this component. The global DAA interface supports connection of the modem to a telephone network, while the data-side interface provides the path between the modem and host equipment. The SI2493-D-FT also incorporates a 6000 V capacitive isolation rating in its documented feature set, making isolation-aware circuit design an important part of telephone-interface implementation.
Typical uses include PSTN data terminals, industrial serial-to-telephone gateways, remote monitoring controllers, legacy equipment retrofits, embedded telephone adapters, and data communication equipment supporting older Bell and ITU protocols. Its 56 kbps maximum connect rate targets data applications where backward-compatible analog telephone access is required rather than broadband connectivity.
The primary design consideration is line-interface implementation. The host PCB must preserve the modem data interface, provide the required clocking and control signals, and implement the DAA network connection with appropriate isolation, surge protection, and hook-state handling. Use the pin-description and typical application diagrams in the Skyworks Solutions data sheet when assigning package pins and selecting external telephone-network components.
This page combines protocol capabilities, package information, drop-in replacement findings, and practical design guidance. It helps engineers distinguish revision and ordering differences while identifying the electrical and thermal checks required before incorporating this legacy-PSTN modem into a new design.
直接替换替代料： SI2493-D-FT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SI2493-D-FT （相同外形与封装尺寸） ——差异在于 Device Type.
SI2493-C-FT
✅ 直接替换联系询价
查看数据手册 →SI2493-D-FT 规格参数
| Device Type | V.92 ISOmodem system-side modem IC |
| Maximum Connect Rate | 56 kbps |
| Supported ITU Modem Formats | V.21, V.22, V.23, V.29, V.32, V.34, V.90 and V.92 |
| Supported Bell Formats | Bell 103 and Bell 212A |
| Error Correction | V.42bis |
| Compatibility Protocols | MNP2-5 |
| Rate Negotiation | Automatic rate negotiation |
| V.92 Features | PCM upstream, Quick Connect and modem on hold |
| Operating Mode | Full-duplex |
| Network Interface | PSTN with global DAA |
| Capacitive Isolation Rating | 6000 V |
| 封装 | 24-pin TSSOP |
| 安装类型 | Surface mount |
| Silicon Revision | Revision D |
| RoHS 状态 | RoHS Compliant |
| Lead-Free Status | Lead Free |
SI2493-D-FT 24-pin tssop 引脚配置指南
SI2493-D-FT（24-pin tssop 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： SI2493-D-FT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI2493-D-FT 适用于 6 应用s: PSTN Data Terminal Equipment, Industrial Remote Monitoring, Remote Service Gateway, Legacy Equipment Retrofit, Telephone Data Adapter, Point-of-Sale Terminal Communication.
PSTN Data Terminal Equipment
The SI2493-D-FT fits legacy PSTN data terminals because it provides full-duplex operation at connect rates up to 56 kbps and supports ITU V.21 through V.92 formats. According to the Skyworks Solutions data sheet, the device also supports Bell 103 and Bell 212A, allowing interoperability with both newer and older modem services. A host processor communicates with the modem through the data-side interface, while the global DAA provides the telephone-network connection. Engineers should implement the DAA isolation and line-network components shown in the typical application circuit, because the modem IC alone does not remove the need for a safe telephone-network interface.
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Industrial Remote Monitoring
The SI2493-D-FT is suitable for industrial remote-monitoring systems that must transfer supervisory data over an analog telephone line rather than a broadband network. Its 56 kbps maximum connect rate and support for V.29, V.32, V.34, V.90, and V.92 provide compatibility with multiple legacy transmission services. The device can operate in full-duplex mode, while automatic rate negotiation supports connection establishment across available line conditions. The implementation must include a correctly isolated global DAA, telephone-line surge protection, and a host interface capable of managing modem commands and status. The documented 6000 V capacitive isolation rating is a key design consideration for the line-facing section.
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Remote Service Gateway
The SI2493-D-FT can provide the PSTN modem path in a remote-service gateway intended to reach legacy equipment. Its support for Bell 103, Bell 212A, V.22, V.23, V.29, V.32, V.34, V.90, and V.92 enables connection to telephone networks and terminal systems using different historical modulation standards. The gateway host can use the data interface while the modem handles line negotiation, including automatic rate negotiation and modem-on-hold behavior. This combination is useful when equipment must be installed where cellular coverage or broadband service is unavailable. Board-level telephone protection and isolation remain mandatory because the modem data sheet explicitly identifies the global DAA and its capacitive isolation requirements.
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Legacy Equipment Retrofit
The SI2493-D-FT is useful when adding a modern host processor to legacy telephone-operated equipment while retaining access to PSTN services. The complete 56 kbps V.92 ISOmodem combines modulation, modem control, and global DAA functions in one 24-pin TSSOP IC. Compatibility with V.42bis, MNP2-5, and older Bell formats improves the probability of interoperability with equipment and services that predate current modem generations. Designers should compare the Revision D initialization sequence with the host firmware before production release. The line interface must preserve the isolation and protection architecture described in the manufacturer data sheet rather than routing telephone-network energy directly into the logic circuitry.
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Telephone Data Adapter
The SI2493-D-FT provides the core modem function for an embedded telephone data adapter connecting a serial or network-capable host to an analog PSTN line. Its 56 kbps rated connect speed is appropriate for configuration transfer, telemetry, and low-bandwidth supervisory data rather than bulk file transfer. Support for V.92, automatic rate negotiation, and modem on hold allows a system to negotiate compatible service parameters and manage active sessions. The implementation should follow the data-sheet host interface and global DAA reference arrangement, including correct clocking and external isolation components. Because the IC is a system-side modem, application firmware must also provide the higher-level data framing and connection-management behavior required by the target equipment.
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Point-of-Sale Terminal Communication
The SI2493-D-FT can support point-of-sale terminals that exchange small transaction or service payloads over the Public Switched Telephone Network. Its full-duplex operation and 56 kbps connect rate provide adequate throughput for short command-and-response exchanges while allowing operation with Bell and ITU modem services. The broad protocol set improves compatibility with older payment peripherals, support equipment, and centralized management systems. Design the DAA section with the isolation network and protective components specified in the Skyworks Solutions data sheet, and keep the modem data interface electrically separated from the telephone line. Software should also handle rate negotiation and modem-on-hold states so transient line conditions do not require a complete host restart.
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推荐产品汇总
工程参考数据： SI2493-D-FT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SI2493-C-FT |
|---|---|---|
| Brand | Skyworks Solutions Inc. | Silicon Labs |
| Package | 24-pin TSSOP | 24-pin TSSOP - same |
| Device Type | V.92 ISOmodem system-side IC | Modem chipset IC |
| Maximum Connect Rate | 56 kbps | 56 kbps |
| Silicon Revision | Revision D | Revision C |
| Number of Pins | 24 pins | 24 pins |
| Mounting Style | Surface mount | Surface mount |
关键差异点
- Newer documented silicon revision （对比 SI2493-C-FT)
- Exact 24-pin TSSOP package compatibility （对比 SI2493-C-FT)
- Documented modern V.92 feature set （对比 SI2493-C-FT)
设计说明
Use the global DAA connection and pin-description tables in the Skyworks Solutions SI2493D data sheet as the basis of the PCB layout. Keep the telephone-network side physically separated from host logic and sensitive signal areas, route the isolation path according to the reference circuit, and place line-interface protection close to the connector entry. This arrangement limits surge-current paths and helps preserve the documented 6000 V capacitive isolation arrangement.
Do not treat a matching 24-pin TSSOP outline as sufficient proof of interchangeability. The SI2493-C-FT is Revision C, while the SI2493-D-FT is Revision D. Before substitution, compare pin assignments, host-interface timing, initialization, modem negotiation behavior, clocking, and line-interface requirements for the exact revision. A production swap should also pass system-level connection and error-recovery testing.
Follow the data-sheet requirements for host-side clocking, data routing, grounding, and bypass placement. The modem and host interface should use short, properly referenced routes, with sensitive timing signals kept away from the DAA and telephone-network surge paths. Validate signal levels and timing across the complete V.92 negotiation range because a successful 56 kbps connection depends on both modem performance and clean host-side communication.
合规信息
The component is identified as RoHS Compliant and Lead Free. No additional REACH, halogen-free, conflict-minerals, or automotive qualification information is established.