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Infineon Technologies SAB82525H-V21
- Part No.:
- SAB82525H-V21
- Manufacturer:
- Infineon Technologies
- Category:
- Specialized
- Package:
- 44-QFP
- Datasheet:
-
SAB82525H-V21.pdf
- Description:
- IC INTERFACE SPECIALIZED 44MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,833
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Product details
Overview
SAB82525H-V21 from Siemens AG is a dual-channel High-Level Serial Communication Controller Extended (HSCX) IC implementing HDLC/LAPB/LAPD/SDLC layer-2 protocol handling with two independent full-duplex serial channels, 64-byte per-channel FIFOs, on-chip DPLL-based clock recovery, and DMA-capable 8-bit demultiplexed bus interface. It operates up to 4 Mbit/s, consumes 25 mW active power at 4 MHz, and targets ISDN terminal adapters, X.25 packet switches, and time-slot-oriented PCM systems.
For engineers reviewing the SAB82525H-V21 datasheet, SAB82525H-V21 pinout, SAB82525H-V21 application, or SAB82525H-V21 equivalent, key selection criteria include dual-channel HDLC offload capability, programmable time-slot assignment (1–256 bits), auto/non-auto/transparent operating modes, integrated DPLL per channel, and P-MQFP-44-2 package compatibility with Intel/Motorola 8/16-bit microprocessor buses.
Technical Context
The SAB82525H-V21 implements two independent HDLC data link controllers, each with dedicated command/status registers, CRC generators/checkers, bit-stuffing logic, flag detection, and address field recognition. Each channel supports programmable baudrate generation, DPLL-based clock recovery, and configurable time-slot lengths for TDM applications.
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). Operating modes include Auto-mode (LAPB/LAPD/SDLC frame handling), Non-Auto mode (user-controlled framing), and multiple Transparent modes for raw byte streaming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent full-duplex HDLC channels - enables concurrent ISDN B-channel and D-channel processing or redundant link operation. |
| Data Rate | Up to 4 Mbit/s per channel - supports E1/T1 line rates and high-speed packet-switched interfaces. |
| FIFO Depth | 64 bytes per channel/direction - decouples serial I/O from CPU bus, reducing interrupt load and enabling burst DMA transfers. |
| Power Consumption | 25 mW active (4 MHz), 4 mW standby - suitable for low-power telecom edge devices with duty-cycled operation. |
| Encoding Support | NRZ, NRZI, Manchester, FM0, FM1 - accommodates legacy and telecom-specific physical layer standards. |
| Time-Slot Assignment | Programmable per channel (1–256 bits) - enables precise alignment with PCM frame structures in digital telephony systems. |
| Protocol Handling | LAPB (X.25), LAPD (ISDN), SDLC-NRM - performs full layer-2 frame assembly/disassembly, CRC, bit stuffing, and error recovery autonomously. |
Pinout & Package
Package: P-MQFP-44-2 (SMD), 44-pin plastic metric quad flat pack with 0.8 mm lead pitch and exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for register access; synchronizes HSCX to host bus timing during memory-mapped I/O. |
| WR/IC0, RD/IC1 | Write/Read Control | Demultiplexed control signals for 8-bit parallel bus; define register write vs. read cycles without address strobe dependency. |
| A0–A6 | Address Lines | 7-bit register address bus; selects among 128 internal registers including SP-REGs, FIFOs, and mode-control registers. |
| INT | Interrupt Output | Open-drain interrupt request signaling channel events (e.g., FIFO threshold, frame completion, error condition). |
| DRQTA, DRQRA, DRQTB, DRQRB | DMA Request | Four independent DMA request lines - one per transmit/receive direction per channel - enabling concurrent multi-channel DMA transfers. |
| DACKA, DACKB | DMA Acknowledge | Per-channel DMA handshake signals; indicate valid data transfer window for synchronous DMA bursts. |
| RxCLKA/B, TxCLKA/B, AxCLKA/B | Serial Clock Inputs | Separate receive, transmit, and auxiliary clock inputs per channel - support independent clock domains and external or DPLL-derived timing. |
| RTSA/RTSB, CTSA/CTSB, CxDA/CxDB | Modem Control | Hardware flow control and carrier detect signaling - enables RS-232/RS-422 modem interfacing without external glue logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel HDLC offload | Reduces host CPU overhead by >90% in ISDN terminal adapter designs through autonomous frame handling, CRC, and bit stuffing. |
| Programmable transparent modes | Enables raw byte streaming (no HDLC framing) with optional 1-bit insertion, data inversion, and length-checking - critical for proprietary protocol tunneling. |
| On-chip DPLL per channel | Eliminates need for external clock recovery ICs in synchronous serial links; locks to incoming data stream with jitter tolerance per ITU-T G.703. |
| 64-byte dual-direction FIFOs | Buffers up to 17 short HDLC frames per channel; allows CPU to process frames in batches rather than per-byte interrupts. |
| Four-channel DMA interface | Supports simultaneous full-duplex data movement across both channels without CPU intervention - essential for real-time packet switching. |
Applications
| ISDN Terminal Adapter | X.25 Packet Switch Node |
|---|---|
Use Scenario: Interface between PSTN/ISDN lines and embedded controller in NT1/TE1 equipment. IC Role / Device Role / Timing Role: Dual-channel HDLC controller handling LAPD (D-channel) and HDLC (B-channel) simultaneously with independent DPLL clock recovery. Use Value: Eliminates external protocol ASICs; reduces BOM count by integrating FIFO, DMA, and modem control logic into single P-MQFP-44 package. |
Use Scenario: Front-end line card in enterprise X.25 switch supporting multiple asynchronous leased lines. IC Role / Device Role / Timing Role: LAPB protocol engine performing frame validation, retransmission, and window management without host CPU involvement. Use Value: Enables 32+ concurrent LAPB sessions via time-sliced channel arbitration and 64-byte FIFO buffering per link. |
| PCM Time-Slot Router | Industrial SDLC Master Station |
Use Scenario: Digital loop carrier system extracting/inserting data into specific T1/E1 time slots. IC Role / Device Role / Timing Role: Time-slot oriented serial controller with programmable slot length (1–256 bits) and independent channel clocking. Use Value: Maps arbitrary-length data packets directly into fixed PCM frames without external framing logic or FPGA glue. |
Use Scenario: Programmable logic controller (PLC) acting as SDLC NRM master polling remote I/O modules over RS-485. IC Role / Device Role / Timing Role: Half-duplex SDLC controller managing poll/response sequences, CRC checking, and timeout-retry logic autonomously. Use Value: Guarantees deterministic response timing under heavy CPU load; maintains link integrity during host firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HDLC communication controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Z8536 | Single-channel HDLC controller; no on-chip DPLL; requires external clock recovery; 32-byte FIFOs. | Limited to point-to-point SDLC or LAPB links; unsuitable for ISDN dual-channel or TDM time-slot routing. | Select when cost-sensitive single-link applications dominate and external clock circuitry is already present. |
| Intel 8273 | Legacy bipolar HDLC controller; higher power (150 mW); no DMA interface; 16-pin DIP only. | Used in vintage industrial telemetry; lacks transparent modes, time-slot programming, and modern packaging. | Select only for legacy system repair or backward-compatible drop-in replacement where footprint and power are secondary. |
Compared with Z8536 and Intel 8273, SAB82525H-V21 delivers dual-channel autonomy, integrated DPLL per channel, and 64-byte FIFOs in a surface-mount package - making it uniquely suited for space-constrained, multi-protocol telecom edge devices requiring zero-host CPU intervention.
Availability
SAB82525H-V21 is available at Aetrix Electronics and suitable for ISDN terminal adapters, X.25 packet switch nodes, and PCM time-slot routers requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial telecom deployments.
Supply support for SAB82525H-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 telecom ICs before spinning off its chip business in 1999.
SAB82525H-V21 belongs to Siemens' High-Level Serial Communication Controller (HSCX) product line, designed specifically for offloading HDLC/LAPB/LAPD/SDLC protocol processing from microcontrollers in telecom infrastructure and industrial networking equipment.
FAQ
What is the maximum supported data rate per channel?
The SAB82525H-V21 supports up to 4 Mbit/s per channel in synchronous mode. This rating is verified across the full operating temperature range (0 °C to +70 °C) and applies to all encoding formats (NRZ, NRZI, Manchester). The DPLL achieves lock within 128 bit times at this rate, meeting ITU-T G.703 jitter tolerance requirements for E1 interfaces.
Does it support both LAPB and LAPD protocols simultaneously?
Yes - Channel A and Channel B operate independently, allowing LAPB (X.25) on one channel and LAPD (ISDN D-channel) on the other. Each channel has dedicated SP-REGs, FIFOs, and DPLLs, enabling concurrent protocol stacks without resource contention or software arbitration overhead.
How does the transparent mode differ from auto-mode in practice?
In Auto-mode, the HSCX handles full HDLC framing (flag insertion, CRC, bit stuffing). In Transparent Mode 0/1, it passes raw bytes unmodified - except for optional 1-bit insertion or data inversion - enabling proprietary protocol tunneling or direct bitstream injection into modems or encryption modules without frame interpretation.
Is external crystal required for clock generation?
No - the SAB82525H-V21 supports both external clock input and on-chip quartz oscillator circuitry (requiring only a 3.579545 MHz or 4.096 MHz crystal per channel). The DPLL can recover clock from incoming serial data, eliminating need for precise external timing sources in slave-receiver configurations.
SAB82525H-V21 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- Serial
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- PG-MQFP-44-2
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
SAB82525H-V21 FAQ
1.How can I place an order for SAB82525H-V21 through Aetrix?
Please submit a Request for Quotation (RFQ) for SAB82525H-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 SAB82525H-V21 reliable?
The price and inventory of SAB82525H-V21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAB82525H-V21 is usually 5 days.
3.What payment methods are accepted for SAB82525H-V21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAB82525H-V21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SAB82525H-V21?
SAB82525H-V21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SAB82525H-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 SAB82525H-V21?
For technical support, including SAB82525H-V21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAB82525H-V21 requirements.
6.How does Aetrix verify that SAB82525H-V21 is sourced from the original manufacturer or authorized distributors?
All SAB82525H-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 SAB82525H-V21 meets industry standards.
7.What is the process for return or replacement of SAB82525H-V21?
All SAB82525H-V21 units undergo pre-shipment inspection (PSI). If there is an issue with SAB82525H-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 SAB82525H-V21 part is unused and in its original packaging.
Return procedure for SAB82525H-V21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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