SI2457-D-FS - 56 kbps ISOmodem IC | Skyworks Solutions
MPN: SI2457-D-FS ✓ فعالSI2457-D-FS نمای کلی
An ISOmodem is a complete integrated data-modem circuit designed to operate with a separate telephone-network interface or data access arrangement. Within the product hierarchy, the SI2457-D-FS is a modem IC, a physical-layer data-communication IC, and an interface semiconductor. Its system-side architecture is intended for equipment that must generate and receive analog telephone-line signals while keeping protocol processing and line-interface functions under the control of embedded host hardware.
Key capabilities include data rates through 56 kbps, automatic rate negotiation, Fast Connect operation, V.42bis error correction, MNP2-5 support, and Type I and Type II caller-ID decoding. The family also supports parallel phone detection and more than 6000 V of capacitive isolation. These functions allow one controller to connect with legacy analog modems, fax equipment, remote-access systems, and other products that still rely on switched telephone networks.
The Si2457/34/15/04 family architecture includes on-chip program ROM containing firmware for the documented features, together with program RAM for minor firmware changes. The SI2457-D-FS designation identifies the SI2457 member and Revision D device configuration. Its 3.3 V operation suits modern embedded systems, while the 16-pin SOIC package supports conventional surface-mount assembly and compact peripheral-interface layouts.
Typical uses include industrial serial-to-telephone gateways, remote monitoring equipment, data-over-voice terminals, legacy controller migration projects, and telephone-line access modules. Designers can use the modem circuit with a line-interface network, isolation components, and a host processor that implements the required data framing and control protocol. The V.90 capability is particularly useful for low-rate connections where compatibility matters more than maximum throughput.
Designers should follow the manufacturer datasheet for the external line-interface network, crystal requirements, supply bypassing, and exposed-ground configuration. The 0 to 70 C operating range is suitable for commercial indoor equipment but not for extended industrial-temperature environments. PCB signal integrity also matters because modem timing, isolation boundaries, and telephone-line return paths can introduce noise if layout guidance is not followed.
This page combines the manufacturer data-sheet details, interface-function breakdown, packaging constraints, application guidance, and selection criteria in one engineering-focused reference. It also identifies where a true pin-to-pin replacement must be checked against the complete electrical interface rather than inferred from the data rate or package name alone.
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درخواست جایگزینSI2457-D-FS مشخصات
| Device Type | System-side ISOmodem IC |
| Maximum Data Rate | 56 kbps |
| ولتاژ تغذیه | 3.3 V |
| دمای کاری | 0 C to +70 C |
| Package Type | SOIC-16 |
| تعداد پایه | 16 pins |
| نوع نصب | Surface mount |
| ITU-T Protocol Support | V.21, V.22, V.23, V.29, V.32, V.34, V.42, V.42bis, V.44 and V.90 |
| Bell Protocol Support | Bell 103 and Bell 212A |
| Error Correction | V.42 and V.42bis |
| Fast Connect | Supported |
| Automatic Rate Negotiation | Supported |
| Caller ID Support | Type I and Type II decode |
| Message Packet Structure | Protocol 1 and Protocol 2 as defined by ETSI ES 201 912 |
| Capacitive Isolation | Over 6000 V |
| Phone Detection | Parallel phone detect |
| وضعیت RoHS | Compliant |
راهنمای پیکربندی پین SI2457-D-FS soic-16
پیکربندی پین برای SI2457-D-FS (پکیج soic-16). شماره‌گذاری پایه‌ها، عملکردها و نمودارهای اتصال در دیتاشیت سازنده تعریف شده است. برای footprint دقیق و دستورالعمل‌های لحیم‌کاری به آن مراجعه کنید.
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کاربردهای معمول
SI2457-D-FS مناسب است برای 6 کاربردs: Industrial Telephone-Line Data Gateway, Legacy Remote-Access Terminal, Data-Over-Voice Equipment, Legacy Printer or Fax Controller, Telephone-Line Monitoring Interface, Migration of Legacy Communication Products.
Industrial Telephone-Line Data Gateway
The SI2457-D-FS is appropriate for an embedded gateway that must communicate through a switched analog telephone line while leaving framing and host control to a microcontroller or communications processor. Its 56 kbps capability covers legacy V.90 links, while V.21, V.22, V.23 and V.34 support allows negotiation with older modem equipment. Place the device with the external line-interface network and isolation components specified by the manufacturer, and provide the required clock and bypass components close to the IC. The 0 C to +70 C rating suits controlled indoor installations but requires a higher-rated device or thermal controls for harsher industrial environments.
پیشنهادی
Legacy Remote-Access Terminal
A remote-access terminal can use the SI2457-D-FS to provide compatibility with legacy telephone-network equipment that still relies on analog modem signaling. The device supports Fast Connect, automatic rate negotiation, V.42bis error correction, and MNP2-5, allowing the host to negotiate useful operating modes instead of assuming a fixed line condition. Its 3.3 V supply and 16-pin SOIC package simplify integration into a modern embedded control board. The external telephone interface must provide the required isolation and impedance arrangement, while the controller should use the manufacturer-defined serial and timing interface to avoid protocol or clocking incompatibilities.
پیشنهادی
Data-Over-Voice Equipment
The SI2457-D-FS fits data-over-voice products that must transfer information over an analog voice-grade connection while sharing telephone infrastructure with conventional voice equipment. Support for V.22, V.23, V.32bis, V.34 and V.90 provides several interoperability levels, and caller-ID decoding can support call-management functions. The modem IC handles modulation and demodulation while higher-level protocol work remains in the host controller. Layout should keep sensitive modem and line-interface sections together, maintain the manufacturer-specified grounding, and isolate external telephone circuitry to prevent conducted noise from disturbing adjacent control signals.
پیشنهادی
Legacy Printer or Fax Controller
The SI2457-D-FS can provide a modern embedded controller with a path to legacy fax and printer equipment that uses older modem formats. V.21, V.22, V.23, V.29, V.32 and V.34 support broadens compatibility with equipment that predates V.90-only designs, while V.42bis and automatic rate negotiation improve connection establishment. Because the IC is a 16-pin SOIC operating from 3.3 V, it fits within a compact mixed-signal control board. Implement the line network, isolation barrier, clocking, and supply bypassing according to the manufacturer application circuit, and verify firmware support for each target printer or fax model.
پیشنهادی
Telephone-Line Monitoring Interface
A monitoring product can use the SI2457-D-FS to establish low-speed data connections over a telephone line for configuration exchange, status reporting, or service diagnostics. V.90 provides a widely recognized 56 kbps mode, while automatic rate negotiation and Fast Connect help the controller establish a connection efficiently. The modem's parallel phone-detection function can assist equipment that distinguishes a data call from other line activity. Design the board around the specified isolation, grounding, and telephone-network components, and validate line-side behavior under real network noise because conducted disturbances can affect modem performance even when digital logic operates normally.
پیشنهادی
Migration of Legacy Communication Products
The SI2457-D-FS supports modernization of equipment that must retain compatibility with established analog modem peers while replacing older host logic with a current processor. Its on-chip program ROM provides the documented modem firmware, and program RAM accommodates minor firmware changes according to the manufacturer description. The result is a compact 16-pin SOIC implementation rather than a collection of separate modulation components. Migration teams should preserve the original line-interface topology, verify clock timing and firmware behavior, and validate every supported rate from V.21 through V.90. This approach reduces redesign risk when both sides of the link may use different legacy modulation standards.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای SI2457-D-FS — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول |
|---|---|
| Brand | Skyworks Solutions Inc. |
| Package | 16-pin SOIC |
| Device Type | System-side ISOmodem IC |
| Supply Voltage | 3.3 V |
| Maximum Data Rate | 56 kbps |
| Operating Temperature | 0 C to +70 C |
| ITU-T Protocol Support | V.21, V.22, V.23, V.29, V.32, V.34, V.42, V.42bis, V.44 and V.90 |
| Caller ID | Type I and Type II decode |
| RoHS Status | Compliant |
تفاوت‌های کلیدی
- Broad legacy modem-format coverage (در مقابلGeneral-purpose 56 kbps modem IC)
- Telephone-aware integration (در مقابلBasic UART-only communications controller)
- Compact mixed-signal implementation (در مقابلDiscrete modem solution)
یادداشت‌های طراحی
Follow the manufacturer application circuit for the external telephone-line network, isolation components, supply bypass capacitors, and clock connection. Place bypass capacitors at the supply pins, keep modem traces away from noisy switching nodes, and preserve the recommended grounding topology. The telephone interface carries high-voltage transients, so copper spacing and isolation placement must follow the datasheet implementation rather than ordinary low-voltage logic conventions.
Treat the modem clock and serial interface as timing-sensitive nets. Route them away from telephone-line and switch-mode supply nodes, use short paths between the SI2457-D-FS and associated passive components, and avoid adding test-point stubs that could disturb edge timing. Validate the complete clock source and host-controller interface at the intended modem rate because protocol compatibility alone does not guarantee a reliable physical connection.
Do not select a substitute based only on the 16-pin SOIC outline, 3.3 V supply, or 56 kbps headline rate. Confirm the numbered pins, telephone-line signal behavior, required protocol set, caller-ID support, operating temperature, and ordering code in the manufacturer documentation. The SI2457 family includes related modem members, but those differences can alter firmware behavior or interface requirements even when the package and supply voltage remain the same.
اطلاعات انطباق
The component description identifies the SI2457-D-FS as RoHS compliant. No separate REACH, AEC-Q100, halogen-free, lead-free, or conflict-minerals declaration is stated.
