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Infineon Technologies SAF82525N-V21
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- Part No.:
- SAF82525N-V21
- Manufacturer:
- Infineon Technologies
- Category:
- Specialized
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SAF82525N-V21.pdf
- Description:
- IC INTERFACE SPECIALIZED 44PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SAF82525N-V21 from Siemens AG is a High-Level Serial Communication Controller Extended (HSCX) IC implementing two independent full-duplex HDLC channels with integrated LAPB, LAPD, and SDLC protocol support. It features 64-byte FIFOs per channel, on-chip DPLL-based clock recovery per channel, and supports data rates up to 4 Mbit/s in telecom and packet-switching applications.
For engineers reviewing the SAF82525N-V21 datasheet, SAF82525N-V21 pinout, SAF82525N-V21 application, or SAF82525N-V21 equivalent, key selection considerations include dual-channel HDLC framing capability, 8-bit demultiplexed bus interface compatibility with Intel/Motorola microcontrollers, DMA-driven block transfers, and programmable time-slot assignment for TDM systems.
Technical Context
The SAF82525N-V21 implements Layer-2 procedural support including full-duplex LAPB/LAPD and half-duplex SDLC-NRM operation with modulo-8/128 frame sequencing, programmable retry timeout, and CRC-16 generation/checking. Each channel includes independent command/status registers and dedicated baudrate generators.
Its serial interface provides multiple encoding modes (NRZ, NRZI, FM0, FM1), configurable modem control (RTS/CTS/CD), collision-resolving bus configuration, and transparent transmission modes that bypass HDLC framing-enabling use in PCM time-slot multiplexing and ISDN terminal equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 4 Mbit/s per channel - enables high-speed synchronous links in X.25 and ISDN access equipment. |
| FIFO Depth | 64 bytes per channel/direction - decouples serial I/O from CPU bus, reducing interrupt load during burst transfers. |
| Protocol Support | LAPB, LAPD, SDLC-NRM - handles I- and S-frames, address recognition, flag detection, bit stuffing, and CRC-16 autonomously. |
| Bus Interface | 8-bit demultiplexed adaptive interface - directly connects to Siemens/Intel/Motorola 8- or 16-bit µP systems without glue logic. |
| Power Consumption | 25 mW active / 4 mW standby at 4 MHz - suitable for low-power telecom line cards and embedded communications modules. |
| Time-Slot Assignment | Programmable per channel (1–256 bits) - supports flexible TDM channelization in PCM-based digital trunk interfaces. |
| DPLL Clock Recovery | On-chip per-channel DPLL - eliminates need for external clock recovery ICs in asynchronous line termination applications. |
Pinout & Package
SAF82525N-V21 is housed in a P-LCC-44-1 (plastic leaded chip carrier, 44-pin, surface-mount) package with 0.8 mm lead pitch and 16.0 × 16.0 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RES | Reset Input | Active-low asynchronous reset; initializes all registers and FIFOs, halts DMA and serial activity. |
| INT | Interrupt Output | Open-drain interrupt request signal indicating frame completion, error, or FIFO threshold event. |
| CS | Chip Select | Enables register access when low; supports multi-device bus decoding in µP systems. |
| WR/IC0, RD/IC1 | Write/Read Control | Demultiplexed control lines for Intel-style 8-bit bus timing; define register write/read cycles. |
| D0–D7 | Data Bus | 8-bit bidirectional data path for register and FIFO access; compatible with standard µP data buses. |
| RxDA, RxDB | Receive Data A/B | Dedicated serial inputs for channel A and B; accept NRZ/NRZI/FM-encoded HDLC streams. |
| TxDA, TxDB | Transmit Data A/B | Dedicated serial outputs; insert flags, perform bit stuffing, and append CRC under hardware control. |
| RTSA, RTSB | Request-to-Send A/B | Channel-specific flow control outputs; assert before transmission to coordinate with external modems or line drivers. |
| CTSA/CxDA, CTSB/CxDB | Clear-to-Send/Data Carrier A/B | Modem handshake inputs; enable transmit only when asserted, supporting full-duplex link management. |
| DRQTA, DRQTB | DMA Request Transmit A/B | Asserted when transmit FIFO falls below threshold; triggers DMA transfer of next data block. |
| DRQRA, DRQRB | DMA Request Receive A/B | Asserted when receive FIFO exceeds threshold; initiates DMA fetch of captured frame data. |
| DACKA, DACKB | DMA Acknowledge A/B | µP/DMA controller asserts to confirm bus grant; synchronizes data transfer timing with FIFO state. |
| AxCLKA, AxCLKB | Asynchronous Clock A/B | External clock input for asynchronous mode; used when internal DPLL is disabled or bypassed. |
| RxCLKA, RxCLKB | Receive Clock A/B | Recovered clock output from DPLL; drives internal sampling logic and synchronizes receive data capture. |
| TxCLKA, TxCLKB | Transmit Clock A/B | Generated clock for serial output; derived from internal baudrate generator or external source. |
Key Features
| Feature | Design Value |
|---|---|
| Dual HDLC Channel Independence | Each channel has separate FIFOs, registers, DPLL, and baudrate generator - enables concurrent ISDN B-channel and signaling channel handling. |
| Hardware Protocol Offload | Performs flag detection, bit stuffing, CRC-16, address filtering, and frame sequencing without CPU intervention - reduces host processor overhead by >70% in LAPD stacks. |
| Transparent Mode Operation | Configurable bypass of HDLC framing logic - supports raw byte streaming for proprietary protocols or test loopback without protocol interpretation. |
| Programmable Time-Slot Length | 1–256 bit per slot per channel - allows precise alignment with E1/T1 frame structures and custom TDM multiplexing schemes. |
| DMA-Optimized Data Flow | Four-channel DMA interface with dedicated DRQ/DACK per direction - enables zero-wait-state block transfers of up to 32-byte frames directly to/from system memory. |
Applications
| ISDN Terminal Adapter | X.25 Packet Switch Node |
|---|---|
Use Scenario: Embedded ISDN TA implementing TE1 functionality with BRI (2B+D) interface. IC Role / Device Role / Timing Role: Dual-channel HSCX manages simultaneous B-channel data transfer and D-channel LAPD signaling with independent clock recovery. Use Value: Eliminates need for discrete UARTs, CRC engines, and clock recovery ICs - reduces BOM count by 5+ components and PCB area by 35%. | Use Scenario: Front-end packet switch in public data network node handling multiple X.25 virtual circuits. IC Role / Device Role / Timing Role: Acts as Layer-2 controller for synchronous leased-line interfaces, performing LAPB framing and error recovery. Use Value: Supports up to 32 concurrent LAPB sessions via time-sliced channel arbitration - scales port density without increasing CPU load. |
| PCM Multiplexer Control | Digital Trunk Interface Card |
Use Scenario: Channelized T1/E1 multiplexer managing 24/30 time slots across multiple physical lines. IC Role / Device Role / Timing Role: Provides per-slot HDLC framing and transparent payload insertion into PCM frames using programmable slot length. Use Value: Enables dynamic reassignment of time slots between voice and data services - improves trunk utilization efficiency by 22%. | Use Scenario: Central office line card interfacing with digital PBX or SS7 signaling gateways. IC Role / Device Role / Timing Role: Handles D-channel signaling (Q.921/Q.931) and B-channel data transport with jitter-tolerant DPLL clock recovery. Use Value: Meets ITU-T G.703/G.704 timing stability requirements (<±50 ppm) without external VCXO - lowers system cost by $4.20/unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HDLC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAB82525N | Same silicon, identical pinout and firmware; differs only in ordering code and screening grade (SAB = standard, SAF = industrial temp range). | SAB82525N rated for 0°C to +70°C; SAF82525N-V21 rated for –40°C to +85°C - required for outdoor telecom cabinets and rail-side base stations. | Select SAF82525N-V21 for extended temperature operation; SAB82525N suffices for commercial indoor equipment. |
| SAF82526N | Single-channel variant; shares same package, bus interface, and register map but disables channel B hardware resources. | Reduces cost and power by ~35% where only one HDLC link is needed - e.g., point-to-point X.25 router or single-B-channel ISDN TA. | Choose SAF82526N when dual-channel capability is unnecessary; retains full software compatibility for easy design scaling. |
Compared with SAB82525N, SAF82525N-V21 delivers guaranteed operation over –40°C to +85°C while maintaining identical electrical and functional behavior; versus SAF82526N, it doubles channel capacity at +28% power and no software change - enabling future-proof ISDN and packet-switching designs.
Availability
SAF82525N-V21 is available at Aetrix Electronics and suitable for ISDN terminal adapters, X.25 packet switches, and digital trunk interface cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SAF82525N-V21 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Siemens AG Semiconductor Group (now Infineon Technologies) was a leading European semiconductor manufacturer specializing in industrial, automotive, and communications ICs before its semiconductor division became Infineon in 1999.
The SAF82525N-V21 belongs to Siemens' High-Level Serial Communication Controller (HSCX) product line, designed specifically for telecom infrastructure applications requiring hardware-accelerated HDLC protocol handling and TDM integration.
FAQ
What is the operating temperature range for SAF82525N-V21?
The SAF82525N-V21 is specified for operation from –40°C to +85°C. This industrial-grade temperature range is validated per Siemens' original qualification testing and supports deployment in uncontrolled environments such as roadside cabinets, railway signaling boxes, and outdoor base stations. The device maintains full electrical performance-including DPLL lock range and FIFO timing-across this entire span.
Does SAF82525N-V21 require an external crystal or oscillator?
No external crystal is required for basic operation: the SAF82525N-V21 includes on-chip oscillators for system clock generation and supports external clock sources via AxCLKA/AxCLKB pins. However, for precise clock recovery in noisy line environments, an external stable reference (e.g., 2.048 MHz or 4.096 MHz) may be applied to improve DPLL jitter performance beyond internal RC tolerance.
Can SAF82525N-V21 operate in half-duplex SDLC mode on both channels simultaneously?
Yes - each channel operates independently and can be configured for half-duplex SDLC-NRM mode via MODE register settings (MDS1/MDS0 = 01). Channel A and B may run different protocols concurrently: e.g., channel A in LAPD auto-mode while channel B executes SDLC-NRM for legacy mainframe connectivity, with no cross-channel interference.
Is there hardware support for CRC-32 or other checksum algorithms?
No - the SAF82525N-V21 implements only CRC-16 (polynomial x¹⁶ + x¹² + x⁵ + 1) as defined in HDLC standards. CRC-32, Fletcher, or other checksums must be handled in software or by external logic. The on-chip CRC engine is tightly coupled to frame boundaries and cannot be repurposed for arbitrary data blocks outside HDLC frame context.
SAF82525N-V21 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- Serial
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- P-LCC-44-1
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
SAF82525N-V21 FAQ
1.How can I place an order for SAF82525N-V21 through Aetrix?
Please submit a Request for Quotation (RFQ) for SAF82525N-V21 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SAF82525N-V21 reliable?
The price and inventory of SAF82525N-V21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAF82525N-V21 is usually 5 days.
3.What payment methods are accepted for SAF82525N-V21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAF82525N-V21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SAF82525N-V21?
SAF82525N-V21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SAF82525N-V21 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SAF82525N-V21?
For technical support, including SAF82525N-V21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAF82525N-V21 requirements.
6.How does Aetrix verify that SAF82525N-V21 is sourced from the original manufacturer or authorized distributors?
All SAF82525N-V21 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SAF82525N-V21 meets industry standards.
7.What is the process for return or replacement of SAF82525N-V21?
All SAF82525N-V21 units undergo pre-shipment inspection (PSI). If there is an issue with SAF82525N-V21, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SAF82525N-V21 part is unused and in its original packaging.
Return procedure for SAF82525N-V21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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