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Analog Devices Inc./Maxim Integrated DS2172TN+T&R
- Part No.:
- DS2172TN+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 32-TQFP
- Datasheet:
-
DS2172TN+T&R.pdf
- Description:
- IC TELECOM INTERFACE 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,452
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Product details
Overview
DS2172TN+T&R from Maxim Integrated (now part of Analog Devices) is a software-programmable Bit Error Rate Tester (BERT) IC for digital communications test systems. It performs pseudorandom and repetitive pattern generation (up to 32-bit length), real-time error detection at bit error rates up to 10⁻², and full BER calculation via 32-bit error/bit counters - all operating from DC to 52 MHz clock rates. It is used in T1/DS1 loopback validation, CSU/DSU diagnostics, and telecom equipment qualification.
For engineers reviewing the DS2172TN+T&R datasheet, DS2172TN+T&R pinout, DS2172TN+T&R application, or DS2172TN+T&R equivalent, this page delivers verified functional identity, validated 32-pin TQFP package mapping, confirmed Intel/Motorola bus interface support, exact pattern synchronization behavior, and two field-validated alternative BERT ICs for telecom test equipment design.
Technical Context
The DS2172TN+T&R integrates four independent functional blocks: pattern generator, pattern detector, 32-bit error counter, and parallel control interface. Its dual-clock architecture supports fully asynchronous transmit (TCLK) and receive (RCLK) paths - both rated 0–52 MHz with gapped-clock tolerance - enabling Fractional-T1, DDS, and per-channel testing.
Pattern generation is configurable via PSR/PLR/PTR registers for pseudorandom sequences (e.g., 2⁶−1, 2⁹−1, 2¹⁵−1 per ITU O.151/O.153) or user-defined 1–32-bit repetitive patterns. Synchronization logic uses RA0/RA1 status bits and SR.0 flag, with resync triggered manually (PCR.1) or auto-disabled (PCR.2), and loss-of-sync flagged on RLOS output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temperature | −40°C to +85°C - qualified for industrial telecom infrastructure environments. |
| Max Clock Rate | 52 MHz - supports full-rate T3 (44.736 Mbps) and OC-1 (51.84 Mbps) physical layer testing. |
| Pattern Length | 1–32 bits - enables precise loopback patterns for T1, Smart Jack, and D4 framing procedures. |
| Error Insertion Range | 10⁻¹ to 10⁻⁷ - programmable via EIR[2:0] bits for stress-testing FEC and monitoring circuitry. |
| Bit Count Resolution | 32-bit BCR/BECR - provides >4.29 billion count range for long-duration BER measurements without overflow. |
| Bus Interface | 8-bit multiplexed AD0–AD7 with Intel/Motorola timing selection (BTS pin) - reduces host MCU pin count and simplifies PCB layout. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and legacy telecom test platforms. |
Pinout & Package
DS2172TN+T&R is housed in a 32-pin Thin Quad Flat Package (TQFP) with 0.8 mm pitch, 9.0 mm × 9.0 mm body, and exposed thermal pad (per DS2172 32-PIN TQFP mechanical drawing). Pin 1 is top-left corner, pin 32 bottom-left, reading counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TL (Pin 1) | Transmit Load input | Positive edge loads PSR contents into pattern generator; MSB appears at TDATA after third TCLK rising edge. |
| RCLK (Pin 27) | Receive clock input | Asynchronous sampling clock (0–52 MHz) for RDATA; fully independent of TCLK - critical for gap-clocking applications like Fractional-T1. |
| TCLK (Pin 30) | Transmit clock input | Drives TDATA output timing; supports gapped clocks and operates independently of RCLK for bidirectional link analysis. |
| TDATA (Pin 32) | Transmit data output | NRZ serial output updated on rising edge of TCLK; driven by internal pattern generator or loopback path. |
| RDATA (Pin 25) | Receive data input | NRZ serial input sampled on rising edge of RCLK; feeds pattern detector and synchronizer logic. |
| INT (Pin 19) | Alarm interrupt output | Open-drain active-low signal flags bit errors (BED), sync loss (RLOS), or counter overflows (BCOF/BECOF) per IMR mask settings. |
| BTS (Pin 14) | Bus type select | Strap high for Motorola timing (AS/DS/R/W), low for Intel timing (ALE/WR/RD) - enables drop-in integration with diverse host controllers. |
| LC (Pin 22) | Load count input | Positive edge latches current BECR/BCR values into readable registers and clears internal counters - essential for accurate BER = BECR/BCR calculation. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudorandom pattern generation | Supports 2⁶−1 through 2³²−1 polynomials (e.g., ITU O.151 2¹⁵−1, O.153 2²³−1) with programmable feedback taps (PTR) and length (PLR). |
| User-defined repetitive patterns | Enables 1–32-bit custom sequences (e.g., all-1s, alternating 1/0, 3-in-24) via PSR0–PSR3 registers - required for D4 line loopback activation/deactivation. |
| Real-time error injection | Hardware-based bit error insertion at 10⁻¹ to 10⁻⁷ rates (EIR[2:0]) plus single-bit error trigger (EIR.3) - validates error-monitoring circuitry without external signal generators. |
| Independent TX/RX clock domains | TCLK and RCLK accept gapped, asynchronous clocks up to 52 MHz - allows testing of non-continuous links (e.g., switched-56, burst-mode channels). |
| Status-driven synchronization | Synchronization confirmed via SR.0 (SYNC), RA0/RA1 flags, and 34+n-bit lock window - ensures reliable pattern alignment before BER accumulation begins. |
Applications
| T1 Line Loopback Validation | CSU/DSU Diagnostic Testing |
|---|---|
Use Scenario: Verifying end-to-end integrity of T1 circuits during installation or maintenance using D4-framed loopback patterns. IC Role / Device Role / Timing Role: DS2172TN+T&R generates D4 activate/deactivate patterns (Table 5), detects returned signals, and computes BER to confirm framing alignment and channel health. Use Value: Eliminates need for external pattern generators; enables automated pass/fail reporting via INT-driven host MCU interrupts. |
Use Scenario: Stress-testing Channel Service Units and Data Service Units under controlled bit error conditions to validate alarm thresholds and recovery behavior. IC Role / Device Role / Timing Role: DS2172TN+T&R injects calibrated 10⁻³–10⁻⁶ errors into transmitted streams while monitoring received BER - directly exercising CSU/DSU error handling logic. Use Value: Confirms compliance with TR-NWT-000102 and GR-474-CORE error response requirements without lab-grade instrumentation. |
| Fractional-T1 Equipment Qualification | Smart Jack Remote Diagnostics |
Use Scenario: Validating multiplexer and demultiplexer behavior when carrying subrate T1 traffic with gapped clocking. IC Role / Device Role / Timing Role: DS2172TN+T&R accepts gapped RCLK/TCLK inputs and synchronizes to discontinuous patterns (e.g., 2⁷−1 Fractional-T1 LB Activate, Table 4), enabling accurate error counting across gaps. Use Value: Measures true bit error performance under real-world clock discontinuity - not possible with fixed-rate BERTs. |
Use Scenario: Enabling remote loopback initiation and BER measurement in Smart Jack units deployed at customer premises. IC Role / Device Role / Timing Role: DS2172TN+T&R executes full test sequence autonomously: load pattern → initiate loopback (LPBK=1) → monitor RDATA → compute BER → assert INT on failure. Use Value: Reduces truck rolls by allowing telco technicians to verify line quality remotely via serial command interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bit error rate tester applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3675 | Single-channel 1.25 Gbps BERT with integrated CDR; no parallel bus interface; requires SPI configuration. | Targets high-speed optical/serial links (SONET/SDH), not T1/DS1 telecom baseband testing. | Select MAX3675 only for ≥622 Mbps applications where DS2172TN+T&R's 52 MHz limit is insufficient. |
| Si5338A | Programmable clock generator with jitter attenuation; lacks pattern generation, error detection, or BER calculation logic. | Used for clock synthesis and distribution - not bit-level error analysis or loopback validation. | Si5338A cannot replace DS2172TN+T&R in BERT functions; consider only if system needs synchronized clock sources alongside BERT operation. |
Compared with MAX3675 and Si5338A, DS2172TN+T&R uniquely combines parallel microcontroller control, dual asynchronous clock domains, programmable pseudorandom/repetitive patterns, and hardware BER computation - making it irreplaceable for legacy and mid-speed telecom infrastructure test equipment requiring T1/DS1, Fractional-T1, and Smart Jack compliance verification.
Availability
DS2172TN+T&R is available at Aetrix Electronics and suitable for T1 line validation, CSU/DSU diagnostics, Fractional-T1 equipment qualification, and Smart Jack remote testing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DS2172TN+T&R 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
Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and RF ICs for industrial, automotive, and communications markets.
The DS2172TN+T&R belongs to Maxim's legacy telecom test IC portfolio, engineered specifically for bit-level validation of T1/E1, DS1, and CSU/DSU equipment - emphasizing deterministic pattern generation, real-time error detection, and host-processor-friendly parallel interfacing.
FAQ
What is the maximum supported clock frequency for DS2172TN+T&R?
The DS2172TN+T&R supports transmit and receive clock inputs (TCLK and RCLK) from DC up to 52 MHz. This covers full-rate T3 (44.736 Mbps), OC-1 (51.84 Mbps), and oversampled DS1 testing. AC timing specifications (tCP = 19 ns minimum) confirm reliable operation at 52 MHz with proper signal integrity layout.
Does DS2172TN+T&R support both Intel and Motorola bus protocols?
Yes, DS2172TN+T&R supports both protocols via the BTS pin (Pin 14): strap low for Intel timing (ALE/WR/RD), high for Motorola timing (AS/DS/R/W). The 8-bit multiplexed AD0–AD7 bus and register-mapped interface ensure seamless integration with either host controller architecture without external glue logic.
How does DS2172TN+T&R handle synchronization for pseudorandom patterns?
DS2172TN+T&R declares synchronization (SR.0 = 1) after receiving 34 + n error-free bits, where n is the polynomial exponent (e.g., 23 for 2²³−1). It validates alignment using the configured polynomial tap (PTR) and length (PLR); RA0/RA1 flags assist qualification. Loss of sync triggers RLOS high and halts error counting until resync.
Can DS2172TN+T&R generate the ITU O.151 2¹⁵−1 test pattern?
Yes, DS2172TN+T&R explicitly supports ITU O.151 2¹⁵−1 via PTR = 0x0D and PLR = 0x0E (Table 4). The device loads FFh into all Pattern Set Registers (PSR0–PSR3) and uses the programmed polynomial to generate and detect this standardized pseudorandom sequence for DS1/DS3 transmission facility testing.
What is the function of the LC pin on DS2172TN+T&R?
The LC (Load Count) pin (Pin 22) triggers a positive-edge-sensitive latch that copies current values from internal 32-bit bit/error counters into readable BCR/BECR registers and resets those internal counters. This atomic operation ensures accurate BER = BECR/BCR calculation without race conditions during ongoing test cycles.
DS2172TN+T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Bit Error Rate Tester (BERT)
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 10mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFP (7x7)
DS2172TN+T&R FAQ
1.How can I place an order for DS2172TN+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2172TN+T&R 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 DS2172TN+T&R reliable?
The price and inventory of DS2172TN+T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2172TN+T&R is usually 5 days.
3.What payment methods are accepted for DS2172TN+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2172TN+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2172TN+T&R?
DS2172TN+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2172TN+T&R 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 DS2172TN+T&R?
For technical support, including DS2172TN+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2172TN+T&R requirements.
6.How does Aetrix verify that DS2172TN+T&R is sourced from the original manufacturer or authorized distributors?
All DS2172TN+T&R 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 DS2172TN+T&R meets industry standards.
7.What is the process for return or replacement of DS2172TN+T&R?
All DS2172TN+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS2172TN+T&R, 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 DS2172TN+T&R part is unused and in its original packaging.
Return procedure for DS2172TN+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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