SI2457-D-FT 56 kbps V.90 Modem | Skyworks Solutions Inc.
Référence : SI2457-D-FT ✓ ActifSI2457-D-FT Présentation
An ISOmodem is a dedicated integrated circuit for encoding and decoding modem signaling. Its position in the communications hierarchy is data modem controller, communication interface IC, and then broader semiconductor category. The SI2457-D-FT is designed for system-side data modem designs where a host controller handles higher-level processing while the modem IC manages the physical-layer bitstream and line signaling.
Key features include data rates up to 56 kbps, ITU-T V-series support, Bell 300 bps operation, V.29 Fast Connect, V.44, V.42, V.42bis, MNP2-5 automatic rate negotiation, and Type I and Type II caller-ID decoding. The device also provides flexible clocking, including a low-cost 32.768 kHz oscillator option and a 4.915 MHz clock option, which helps designers adapt the circuit to different system timing requirements.
The three interface choices—UART, SPI, and parallel—reduce host-processor integration constraints. UART and SPI support serialized host connections for compact embedded systems, while the parallel interface can suit controllers with dedicated data bus resources. The integrated modem function reduces the need for separate line-interface circuitry in applications using the supported ITU-T and Bell data formats.
Typical uses include legacy telephone-data equipment, fax and multifunction-printer interfaces, industrial data collection over telephone lines, embedded remote-access systems, and legacy telecommunications equipment that must interoperate with V.90, V.34, V.32bis, or Bell 212A services. The 24-pin TSSOP package is surface-mountable and appropriate for compact board layouts.
For implementation, confirm the selected clock source, host-interface mode, line-side network requirements, and supported data standard before finalizing the PCB. Use the manufacturer data sheet for the complete pin-description table, electrical limits, interface timing, and application circuit details.
Alternatives de remplacement direct pour SI2457-D-FT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec SI2457-D-FT (même facteur de forme et même empreinte) — différant par Capacitive Isolation, Device Type, Error Correction, Supply Voltage.
SI2457-D-GTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI2457-D-FTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI2457-C-FTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI2457-C-GTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI2493-FT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI2457-D-FT Spécifications
| Product Type | 56 kbps V.90 data modem controller |
| Maximum Data Rate | 56 kbps |
| Supported ITU-T Formats | V.21, V.22, V.23, V.29, V.32, V.34, V.42, V.42bis, V.44, V.90 |
| Supported Bell Formats | Bell 103 and Bell 212A |
| Bell 300 bps Support | Up to 300 bps |
| Fast Connect | V.29 |
| Automatic Rate Negotiation | MNP2-5 |
| Caller ID Support | Type I and Type II decode |
| Host Interface Options | UART, SPI, or parallel |
| External Memory Requirement | No external ROM or RAM required |
| Clock Options | 32.768 kHz oscillator or 4.915 MHz clock |
| Boîtier | 24-pin TSSOP |
| Type de montage | Surface mount |
| Data Sheet Revision | Revision D |
| Manufacturer | Skyworks Solutions Inc. |
Guide de configuration des broches du SI2457-D-FT 24-pin tssop
Configuration des broches du SI2457-D-FT (boîtier 24-pin tssop). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour SI2457-D-FT.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
SI2457-D-FT convient pour 6 applications: Legacy Telephone Data Terminals, Multifunction Printer Data Interfaces, Industrial Remote Data Collection, Caller ID Telephone Systems, Embedded Network Appliances, Telecommunications Test Equipment.
Legacy Telephone Data Terminals
The SI2457-D-FT fits legacy telephone-data terminals that require a complete modem signal chain with support for both ITU-T and Bell formats. Its 56 kbps maximum rate, V.90 capability, Bell 103 support, and Bell 212A support allow one controller to address several line-service requirements. The host processor can use UART, SPI, or parallel communication, while the modem IC handles modulation and demodulation. This combination reduces external processing requirements and supports compact designs for legacy data equipment.
Recommandé
Multifunction Printer Data Interfaces
The SI2457-D-FT can support a telephone-line data interface in a multifunction printer or legacy fax terminal. V.29 Fast Connect shortens connection establishment for supported services, while V.32, V.34, and V.90 provide progressively higher-rate operation up to 56 kbps. The controller's three host-interface choices also let a printer controller select a compact serial connection or a parallel data path. The 24-pin TSSOP package conserves board area in compact office equipment.
Recommandé
Industrial Remote Data Collection
The SI2457-D-FT is applicable to industrial remote-data collection equipment built around legacy telephone infrastructure. Its MNP2-5 automatic rate negotiation and broad protocol set help the modem establish links across different services, while caller-ID decoding can support endpoint identification functions. A UART interface is especially practical for an embedded supervisory controller. Designers should confirm line protection, isolation, surge immunity, and applicable regional telephone-network requirements before field deployment.
Recommandé
Caller ID Telephone Systems
The SI2457-D-FT supports Type I and Type II caller-ID decoding, making it relevant to telephone-system equipment that must receive caller information while handling modem data. Its integrated modem functions reduce the need for a separate codec and data-modulator arrangement, and the SPI or UART host interface allows decoded information to be passed to a system controller. The design must still observe the line-interface and isolation requirements of the target telephone equipment.
Recommandé
Embedded Network Appliances
The SI2457-D-FT can add a legacy modem connection to an embedded appliance when the equipment must interoperate with V.90 or Bell 212A services. Its no-external-ROM-or-RAM architecture simplifies firmware and hardware integration, and the parallel interface option may reduce host-protocol overhead in designs with an available data bus. A system requiring modern IP connectivity should also include a separate network path, because this controller addresses voice-band modem standards rather than Ethernet protocols.
Recommandé
Telecommunications Test Equipment
The SI2457-D-FT is suitable for telecommunications test and monitoring equipment that needs to interact with legacy modem signals. Supporting V.21 through V.90, Bell 103, and Bell 212A enables the controller to participate in tests spanning several legacy data rates and handshake procedures. The flexible clock arrangement supports laboratory and embedded clocking plans, while UART, SPI, and parallel interfaces allow adaptation to different test-controller architectures. Verify exact line levels and timing against the equipment specification.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SI2457-D-FT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SI2457-D-GTR | SI2457-D-FTR | SI2457-C-FTR | SI2457-C-GTR | SI2493-FT |
|---|---|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP |
| Brand | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. |
| Product Class | 56 kbps V.90 system-side modem controller | SI2457-family modem controller | 56 kbps V.90 system-side modem controller | SI2457-family modem controller | SI2457-family modem controller | 56 kbps V.90-class system-side modem controller |
| Family Revision | Revision D | Revision D family | Revision D family | C revision | C revision | Revision D family document |
Principaux différenciateurs
- Broad legacy modem-format coverage (vs SI2457-C-FTR)
- Three selectable host-interface styles (vs SI2493-FT)
- Caller-ID and rate-negotiation functions (vs SI2457-D-GTR)
Notes de conception
Assign the host interface mode before routing the PCB. Keep UART, SPI, and parallel traces away from the modem line-side section, and place clock circuitry close to the associated device pins. Use the manufacturer application schematic and pin-description table to preserve the required clock topology. This separation reduces the chance that host-edge coupling or clock crosstalk will disturb modem signaling.
Treat the telephone-line side as a high-impedance analog signaling environment and follow the manufacturer reference circuit for isolation, protection, impedance, and filtering. Verify the network interface requirements for each target country and service. The SI2457-D-FT supports multiple legacy standards, but the external line-network implementation must match the selected V-series or Bell operating mode.
Do not assume that a related ordering suffix is automatically a board-level substitute. Confirm the 24-pin TSSOP footprint, pin functions, power connections, clock option, host-interface mode, and electrical limits in the family data sheet. In particular, Revision D and Revision C family members should be checked for specification changes before replacing the SI2457-D-FT in an existing design.
Follow the manufacturer guidance for bypass capacitors, clock supply sequencing, and power-state transitions. Place required capacitors at the package pins using the shortest possible current paths, and account for startup behavior when the host controls modem resets or interface mode selection. Validate the design across all intended V-series and Bell modes rather than testing only the fastest V.90 path.
Informations de conformité
The SI2457-D-FT data sheet and product pages do not establish the requested environmental or automotive compliance statuses in the available product information.
