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Analog Devices Inc./Maxim Integrated DS2151QNB
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- Part No.:
- DS2151QNB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS2151QNB.pdf
- Description:
- IC TXRX T1 1-CH 5V LP IND 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,464
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Product details
Overview
DS2151QNB from Maxim Integrated is a T1 single-chip transceiver (SCT) implementing full DS1/ISDN-PRI line interface, framer, jitter attenuator, and parallel control port. It supports long- and short-haul trunks up to 6000 ft, generates DSX-1 and CSU line build-outs (–7.5dB, –15dB, –22.5dB), and operates at 1.544MHz with 5V supply. It is used in telecom central office line cards and ISDN-PRI access gateways.
For engineers reviewing the DS2151QNB datasheet, DS2151QNB pinout, DS2151QNB application, or DS2151QNB equivalent, key selection criteria include T1 framing support (D4/ESF/SLC-96R), dual elastic store slip buffers, robbed-bit signaling extraction/insertion, ANSI T1.403-199X and ITU G.703/G.704 compliance, and 44-pin PLCC package compatibility.
Technical Context
The DS2151QNB integrates independent transmit and receive paths with separate clock domains: RCLK (1.544MHz recovered), TCLK (1.544MHz primary), and SYSCLK (1.544MHz or 2.048MHz for elastic store synchronization). Its framer locates frame/multiframe boundaries, enforces one's density, and handles FDL/FS bit insertion/extraction per ESF and D4 standards.
It features two 2-frame elastic stores for phase/frequency alignment between asynchronous backplane clocks and recovered T1 data, plus programmable channel blocking (RCHBLK/TCHBLK) and dual open-drain alarm interrupts (INT1/INT2) for real-time status monitoring in carrier-grade systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1 Data Rate | 1.544Mbps - precisely matches DS1 standard for North American digital trunking. |
| Framing Support | D4, ESF, SLC-96R - enables interoperability across legacy and modern T1 networks including ISDN-PRI. |
| Jitter Attenuation | 32-bit or 128-bit selectable - suppresses incoming jitter to meet G.823 wander tolerance requirements. |
| Line Build-Out | –7.5dB, –15dB, –22.5dB - configurable analog drive strength for short- and long-haul transformer-coupled lines. |
| Supply Voltage | 5V ±5% - compatible with legacy telecom power rails; low-power CMOS reduces thermal load on dense line cards. |
| Operating Temp | –40°C to +85°C - qualified for industrial and outdoor telecom equipment environments. |
| Parallel Port | 8-bit multiplexed AD0–AD7 with Intel/Motorola timing - simplifies microcontroller interfacing without external glue logic. |
Pinout & Package
DS2151QNB is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with gull-wing leads, footprint-compatible with industry-standard 44-PLCC sockets and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP / RRING | Analog Receive Inputs | Transformer-coupled AMI waveform inputs; support automatic clock/data recovery over 0–6000 ft trunks. |
| TTIP / TRING | Analog Transmit Outputs | Drive T1 line via step-up transformer; output level set by LBO configuration in LICR register. |
| RCLK / TCLK | Receive & Transmit Clocks | 1.544MHz NRZ clocks; RCLK recovered from line, TCLK externally supplied - enables fully independent TX/RX timing. |
| RLINK / TLINK | FDL/Fs Bit I/O | 4kHz/2kHz demand interfaces for ESF FDL or D4 Fs bit insertion/extraction; synchronized to frame boundaries. |
| RSYNC / TSYNC | Frame Boundary Signals | Programmable I/O pins indicating frame/multiframe sync; enable precise timing alignment for drop-and-insert applications. |
| INT1 / INT2 | Alarm Interrupt Outputs | Open-drain active-low flags for loss-of-sync, yellow/blue alarms, and error counter thresholds per Status Registers 1/2. |
| AD0–AD7 | Multiplexed Address/Data Bus | Shared 8-bit bus for register access; reduces MCU interface pin count and PCB routing complexity. |
Key Features
| Feature | Design Value |
|---|---|
| ANSI One's Density Monitor & Enforcer | Ensures B8ZS/AMI compliance by detecting and correcting excessive zero sequences in real time. |
| Dual Elastic Store Slip Buffers | Two independent 2-frame buffers absorb phase drift between recovered T1 data and backplane SYSCLK (up to 8.192MHz). |
| Robbed-Bit Signaling Support | Extracts and inserts A/B bits in all 24 DS1 channels for CAS-based voice trunk signaling in PBX and CO applications. |
| CSU Loop Code Generation | Generates and detects standard CSU loopback codes (e.g., 0x00, 0xFF) for remote line diagnostics and maintenance. |
| Large Error Counters | Hardware counters for BPV, CV, CRC6, and framing bit errors - enables precise SLA monitoring and fault isolation. |
Applications
| Central Office Line Card | ISDN-PRI Access Gateway |
|---|---|
Use Scenario: Aggregating multiple T1 lines in carrier-class switching infrastructure with strict jitter and error performance requirements. IC Role / Device Role / Timing Role: Full T1 transceiver handling line interface, framing, clock recovery, and signaling for each DS1 span. Use Value: Eliminates need for discrete framer, jitter cleaner, and line driver ICs - reduces BOM cost and board space by >40% per T1 port. | Use Scenario: Providing PRI interface between PSTN and VoIP media gateways supporting 23B+D channels. IC Role / Device Role / Timing Role: DS1 physical layer transceiver with robbed-bit CAS and ESF framing for ISDN signaling transport. Use Value: Native support for D-channel extraction/insertion and B-channel transparency enables direct LAPD controller interfacing. |
| Fractional T1 Multiplexer | Remote DSLAM Management Link |
Use Scenario: Delivering subrate services (e.g., 384kbps, 768kbps) over shared T1 infrastructure using channel blocking. IC Role / Device Role / Timing Role: T1 framer with programmable RCHBLK/TCHBLK outputs to gate unused channel clocks in serial UART/LAPD paths. Use Value: Enables dynamic bandwidth allocation without FPGA or CPLD logic - simplifies firmware-driven service provisioning. | Use Scenario: Backhaul management link connecting DSLAMs to OLTs using embedded T1 for out-of-band telemetry. IC Role / Device Role / Timing Role: Reliable T1 PHY with robust LOS/LOTC detection and large error counters for remote fault logging. Use Value: Built-in yellow/blue alarm generation and CSU loop code support allows automated line health verification without external test gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2153Q | Pin-compatible E1 single-chip transceiver; supports 2.048Mbps E1, not T1; lacks DSX-1 LBO generation. | Targeted at European/E1 infrastructure; cannot replace DS2151QNB in T1-only deployments. | Select DS2151QNB for North American T1 systems; DS2153Q only where E1 compliance is mandatory. |
| MC145508 | Legacy T1 framer without integrated line interface or jitter attenuator; requires external line driver and clock recovery. | Higher system-level design effort; no elastic store or programmable channel blocking. | Choose DS2151QNB when minimizing component count and meeting G.823 jitter specs is critical. |
Compared with DS2153Q and MC145508, DS2151QNB uniquely combines T1-specific line interface, 32/128-bit jitter attenuation, and dual elastic stores in a single 44-pin PLCC - enabling compact, standards-compliant T1 line cards without external analog or timing components.
Availability
DS2151QNB is available at Aetrix Electronics and suitable for telecom infrastructure, ISDN-PRI gateway, and fractional T1 multiplexer applications requiring stable component supply and long-term lifecycle support.
Supply support for DS2151QNB 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for communications, industrial, and automotive markets.
The DS2151QNB belongs to Maxim's T1/E1 transceiver product line, engineered specifically for carrier-grade digital telephony infrastructure requiring ANSI T1.403 and ITU G.703/G.704 compliance.
FAQ
What is the primary function of the DS2151QNB in a T1 system?
The DS2151QNB serves as a complete T1 single-chip transceiver, integrating line interface, framer, jitter attenuator, elastic store, and parallel control port. It recovers clock and data from AMI waveforms, frames D4/ESF streams, inserts/extracts robbed-bit signaling, and drives the T1 line - eliminating the need for multiple discrete ICs in DS1 line card designs.
Does the DS2151QNB support both D4 and ESF framing formats?
Yes, the DS2151QNB natively supports D4, ESF, and SLC-96R framing formats. Its framer dynamically locates frame and multiframe boundaries, validates CRC6 in ESF mode, and extracts/inserts FDL bits or Fs bits depending on the selected format - all configurable via internal registers.
How does the DS2151QNB handle jitter on the incoming T1 signal?
The DS2151QNB includes a selectable 32-bit or 128-bit jitter attenuator placed in either the transmit or receive data path. This circuit filters phase noise and meets ITU G.823 wander specifications, ensuring clean clock distribution to downstream backplane logic even under high-jitter line conditions.
What is the role of the elastic store buffers in the DS2151QNB?
The DS2151QNB contains two independent 2-frame elastic store slip buffers that align the phase and frequency of recovered T1 data with an asynchronous backplane clock (SYSCLK). This enables seamless integration into systems where the backplane clock is not derived from the T1 line - critical for multi-port line cards and packet-switched backplanes.
Can the DS2151QNB generate and detect CSU loop codes?
Yes, the DS2151QNB includes on-board FDL support circuitry that both generates and detects standard CSU loop codes (e.g., 0x00, 0xFF) for local and remote loopback testing. This capability is implemented in hardware and accessible via dedicated control registers, enabling automated line diagnostics without host processor intervention.
DS2151QNB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Single-Chip Transceiver
- Interface:
- T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Supply:
- 65mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
DS2151QNB FAQ
1.How can I place an order for DS2151QNB through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2151QNB 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 DS2151QNB reliable?
The price and inventory of DS2151QNB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2151QNB is usually 5 days.
3.What payment methods are accepted for DS2151QNB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2151QNB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2151QNB?
DS2151QNB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2151QNB 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 DS2151QNB?
For technical support, including DS2151QNB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2151QNB requirements.
6.How does Aetrix verify that DS2151QNB is sourced from the original manufacturer or authorized distributors?
All DS2151QNB 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 DS2151QNB meets industry standards.
7.What is the process for return or replacement of DS2151QNB?
All DS2151QNB units undergo pre-shipment inspection (PSI). If there is an issue with DS2151QNB, 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 DS2151QNB part is unused and in its original packaging.
Return procedure for DS2151QNB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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