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Infineon Technologies SAB82525N-V21TR
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- Part No.:
- SAB82525N-V21TR
- Manufacturer:
- Infineon Technologies
- Category:
- Specialized
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SAB82525N-V21TR.pdf
- Description:
- IC INTERFACE SPECIALIZED 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,782
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Product details
Overview
SAB82525N-V21TR from Siemens AG is a dual-channel High-Level Serial Communication Controller Extended (HSCX) IC implementing full-duplex HDLC/LAPB/LAPD/SDLC protocol handling, featuring 64-byte FIFO per channel, 4 Mbit/s max data rate, and integrated DPLL-based clock recovery per channel - deployed in ISDN terminal adapters and X.25 packet-switching gateways.
For engineers reviewing the SAB82525N-V21TR datasheet, SAB82525N-V21TR pinout, SAB82525N-V21TR application, or SAB82525N-V21TR equivalent, key selection criteria include dual-channel HDLC offload capability, 8-bit demultiplexed bus interface compatibility with Intel/Motorola µPs, DMA-driven block transfers (32-byte bursts), and programmable time-slot assignment for TDM systems.
Technical Context
The SAB82525N-V21TR implements two independent serial channels, each with dedicated DPLL for clock recovery, dual baudrate generators, and fully autonomous layer-2 processing including CRC-16 generation/checking, bit stuffing, flag detection, and address field recognition. It supports auto-mode (LAPB/LAPD/SDLC), non-auto mode, and multiple transparent modes with configurable ADM control.
Its CPU interface provides 8-bit demultiplexed addressing (A0–A6), interrupt signaling (INT), four DMA request lines (DRQTA/DRQRA/DRQTB/DRQRB), and two DMA acknowledge lines (DACKA/DACKB), enabling efficient memory-mapped I/O and burst transfers without CPU intervention during frame transmission or reception.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent full-duplex HDLC channels - enables concurrent ISDN B-channel handling or split LAPD/LAPB links. |
| Max Data Rate | 4 Mbit/s per channel - supports E1/T1 framing and high-speed X.25 packet relay. |
| FIFO Depth | 64 bytes per channel/direction - buffers up to 17 short HDLC frames, reducing interrupt frequency by >80% vs. byte-wise I/O. |
| Bus Interface | 8-bit demultiplexed adaptive interface - directly connects to Siemens/Intel/Motorola 8/16-bit µP buses without glue logic. |
| Power Consumption | 25 mW active (4 MHz), 4 mW standby - suitable for low-power telecom line cards and embedded gateway modules. |
| Protocol Support | LAPB (X.25), LAPD (ISDN), SDLC-NRM, HDLC - hardware-accelerated layer-2 functions eliminate host software overhead. |
| Encoding Modes | NRZ, NRZI, FM0, Manchester - selectable per channel for compatibility with legacy modems and PCM systems. |
Pinout & Package
P-LCC-44-1 (plastic leaded chip carrier, 44-pin, surface-mount). Pin layout validated per Siemens User's Manual 10.94, Figure "Pin Configurations (top view)" for SAB 82525.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RES | Asynchronous Reset Input | Active-low global reset - initializes all registers, FIFOs, and state machines; requires ≥100 ns pulse width. |
| CS | Chip Select Input | Enables register access only when low - allows multi-device bus sharing with address decoding. |
| WR/IC0, RD/IC1 | Write/Read Control + Interrupt Configuration | Demultiplexed control: WR writes registers, RD reads status/data; IC0/IC1 configure interrupt polarity and level. |
| A0–A6 | Address Inputs | 7-bit register address bus - selects among 128 internal registers including SP-REGs, command/status, and FIFO control. |
| D0–D7 | Data Bus | 8-bit bidirectional data path - transfers command bytes, status flags, and frame payloads synchronously with WR/RD. |
| INT | Interrupt Request Output | Open-drain, active-low - signals frame completion, error, or FIFO threshold events; supports wired-OR interrupt chaining. |
| DRQTA, DRQRA, DRQTB, DRQRB | DMA Request Outputs | Four independent request lines - DRQTA/DRQRA for channel A Tx/Rx; DRQTB/DRQRB for channel B - trigger DMA cycles per channel. |
| DACKA, DACKB | DMA Acknowledge Inputs | Per-channel handshake - DACKA confirms channel A DMA grant; DACKB confirms channel B grant; enables burst transfers. |
| RxCLKA, RxCLKB | Receive Clock Inputs | External or DPLL-derived clocks - sample incoming serial data; DPLL locks to incoming bit stream for jitter-tolerant recovery. |
| TxCLKA, TxCLKB | Transmit Clock Inputs | Source for serial output timing - may be derived from on-chip baudrate generator or external source for synchronous master mode. |
| AxCLKA, AxCLKB | Alternate Clock Inputs | Secondary clock sources - used for auxiliary timing, e.g., time-slot synchronization in TDM applications. |
| RxDA, RxDB | Receive Data Inputs | Differential or single-ended serial inputs - accept NRZ/NRZI/FM0/Manchester encoded streams per channel. |
| TxDA, TxDB | Transmit Data Outputs | Serial outputs - drive line drivers or modems; support programmable data inversion and one-bit insertion for HDLC compliance. |
| RTSA, RTSB | Request-to-Send Outputs | Flow control handshaking - assert before transmission; support special RTS function for modem control and channel activation. |
| CTSA/CxDA, CTSB/CxDB | Clear-to-Send / Carrier Detect Inputs | Modem status inputs - CTSA/B indicate remote readiness; CxDA/B detect carrier presence for automatic link establishment. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel HDLC offload | Hardware executes flag detection, bit stuffing, CRC-16, and frame alignment - frees host CPU from real-time layer-2 processing. |
| Programmable time-slot assignment | Each channel supports independent time-slot length (1–256 bits) and position - enables integration into PCM-based TDM multiplexers. |
| 4-channel DMA interface | Separate DRQ/DACK per channel direction - enables zero-CPU-overhead block transfers of up to 32-byte payloads using standard µP DMA controllers. |
| Transparent mode operation | Full bypass of HDLC framing - transmits/receives raw byte streams without modification, supporting proprietary protocols or test patterns. |
| Receive length check | Configurable minimum/maximum frame size validation - discards undersized/oversized frames before CPU notification, reducing software error handling load. |
Applications
| ISDN Terminal Adapter | X.25 Packet Switching Gateway |
|---|---|
Use Scenario: Connecting analog PSTN devices to digital ISDN networks via BRI interface. IC Role / Device Role / Timing Role: Dual-channel LAPD controller managing D-channel signaling and B-channel data transport with strict timing compliance to ITU-T I.430. Use Value: Eliminates need for external protocol processors; 64-byte FIFOs absorb bursty traffic from fax/modem handshakes without frame loss. | Use Scenario: Aggregating multiple asynchronous serial lines into a shared X.25 virtual circuit network. IC Role / Device Role / Timing Role: LAPB link-layer engine performing CRC, retransmission, and window management independently of host router CPU. Use Value: Reduces host interrupt load by >90% versus software-only LAPB stacks; supports up to 4 Mbit/s aggregate throughput per port. |
| PCM-Based TDM Multiplexer | Industrial Serial Protocol Bridge |
Use Scenario: Time-division multiplexing of RS-232/RS-485 sensor data onto E1 trunk lines. IC Role / Device Role / Timing Role: Time-slot oriented serial controller assigning fixed-length slots (e.g., 8-bit per sensor) across 32 time-slots per frame. Use Value: Programmable slot length (1–256 bits) and position enables deterministic latency and guaranteed bandwidth per sensor channel. | Use Scenario: Bridging legacy Modbus RTU devices to modern Ethernet/IP infrastructure via serial-to-IP gateway. IC Role / Device Role / Timing Role: Transparent serial controller forwarding unmodified byte streams while providing hardware flow control (RTS/CTS) and carrier detection (CD). Use Value: Maintains exact timing and framing of Modbus RTU packets; eliminates UART-level framing errors caused by software buffering delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HDLC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Z8536 | Single-channel Zilog ESCC; no integrated DPLL; requires external clock recovery circuitry. | Limited to point-to-point SDLC links; unsuitable for ISDN LAPD due to missing time-slot and DPLL features. | Select when cost-sensitive, single-link designs dominate and external clock recovery is acceptable. |
| SAB82526N | Pin/software compatible single-channel variant; identical register set and FIFO depth but only channel A implemented. | Reduces PCB area and power by 30%; used where only one HDLC link is required (e.g., single-BRI terminal). | Choose for simplified design, lower BOM count, and identical firmware reuse in single-channel deployments. |
Compared with Z8536 and SAB82526N, the SAB82525N-V21TR uniquely delivers dual-channel HDLC with on-chip DPLL, time-slot assignment, and 4-channel DMA - making it the only option for compact, low-latency ISDN or X.25 multi-link gateways requiring autonomous layer-2 processing.
Availability
SAB82525N-V21TR is available at Aetrix Electronics and suitable for ISDN terminal adapters, X.25 packet switching gateways, and PCM-based TDM multiplexers requiring stable component supply and long-term industrial lifecycle support.
Supply support for SAB82525N-V21TR 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 IC manufacturer specializing in industrial, telecom, and automotive semiconductors prior to its semiconductor division spin-off in 1999.
The SAB82525 belongs to Siemens' High-Level Serial Communication Controller (HSCX) product line, designed specifically for offloading HDLC/LAPD/LAPB protocol processing from host microprocessors in telecom infrastructure and packet-switching equipment.
FAQ
What is the maximum supported data rate per channel?
The SAB82525N-V21TR supports up to 4 Mbit/s per channel in synchronous mode. This rate is achievable with external clock input or internal baudrate generator configured for high-frequency operation. The DPLL maintains lock within ±100 ppm jitter, ensuring reliable frame recovery at full speed.
Does it support both LAPB and LAPD protocols simultaneously?
Yes - each channel operates independently and can be configured for different protocols. Channel A may run LAPB (X.25) while Channel B runs LAPD (ISDN), enabled via separate MODE register settings (MDS1/MDS0) and protocol-specific command sequences defined in the register map.
How does the DPLL function in receive mode?
The DPLL recovers clock from incoming serial data using phase comparison against an internal reference. It locks to bit rates from 2.4 kbit/s to 4 Mbit/s, tracks frequency drift up to ±100 ppm, and provides stable RxCLK output for sampling - eliminating need for external clock recovery ICs in most telecom applications.
Is the SAB82525N-V21TR RoHS compliant?
No - manufactured in 1994 under Siemens' pre-RoHS process, the SAB82525N-V21TR contains lead in solder and packaging materials. It is intended for legacy system repair, military/aerospace obsolescence management, and industrial equipment with extended lifecycle requirements where RoHS exemption applies.
SAB82525N-V21TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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
SAB82525N-V21TR FAQ
1.How can I place an order for SAB82525N-V21TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SAB82525N-V21TR 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 SAB82525N-V21TR reliable?
The price and inventory of SAB82525N-V21TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAB82525N-V21TR is usually 5 days.
3.What payment methods are accepted for SAB82525N-V21TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAB82525N-V21TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SAB82525N-V21TR?
SAB82525N-V21TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SAB82525N-V21TR 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 SAB82525N-V21TR?
For technical support, including SAB82525N-V21TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAB82525N-V21TR requirements.
6.How does Aetrix verify that SAB82525N-V21TR is sourced from the original manufacturer or authorized distributors?
All SAB82525N-V21TR 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 SAB82525N-V21TR meets industry standards.
7.What is the process for return or replacement of SAB82525N-V21TR?
All SAB82525N-V21TR units undergo pre-shipment inspection (PSI). If there is an issue with SAB82525N-V21TR, 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 SAB82525N-V21TR part is unused and in its original packaging.
Return procedure for SAB82525N-V21TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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