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Analog Devices Inc./Maxim Integrated DS2141AQ+
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- Part No.:
- DS2141AQ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS2141AQ+.pdf
- Description:
- IC TELECOM INTERFACE 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,136
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Product details
Overview
DS2141AQ+ from Maxim Integrated (now part of Analog Devices) is a T1 framing transceiver IC designed as a software-configurable slave framer for microcontroller-based T1 line interface systems. It supports D4, ESF, and SLC-96 framing formats; provides dual 2-frame elastic store buffers; extracts/inserts robbed-bit signaling; and operates from a single 5V supply. It serves in telecom access equipment for ISDN-PRI and T1 channel bank applications.
For engineers reviewing the DS2141AQ+ datasheet, DS2141AQ+ pinout, DS2141AQ+ application, or DS2141AQ+ equivalent, key selection considerations include its parallel control port timing flexibility (Intel/Motorola), programmable output clocks (TCHCLK, RLCLK, TLCLK), FDL support, and compatibility with DS2186/DS2187 line interface devices - all critical for T1 framer co-design and alarm handling in carrier-grade infrastructure.
Technical Context
The DS2141AQ+ implements fully independent transmit and receive sections with frame/multiframe synchronization logic compliant with ANSI T1.403-1989, AT&T TR 62411, and CCITT G.704/G.706. Its receive side performs bipolar violation detection, yellow/blue alarm monitoring, and loss-of-sync recovery using configurable sync criteria and auto-resync modes.
Transmit functionality includes programmable B8ZS encoding, bit-7 zero suppression, payload loopback (PLB), and local loopback (LLB) modes. Control is executed via a 62-register map accessed through an 8-bit multiplexed address/data bus, with register-level configuration of framing mode, elastic store enable, signaling insertion, and interrupt masking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1 Data Rate | 1.544 Mbps - precisely matches North American T1 line rate; requires 1.544 MHz TCLK and RCLK inputs. |
| Framing Standards | D4, ESF, SLC-96 - enables interoperability across legacy and modern T1 networks including ISDN-PRI trunking. |
| Supply Voltage | 5.0 V ±5% - single-supply operation simplifies power design; compatible with standard TTL/CMOS logic interfaces. |
| Elastic Store | Dual 2-frame buffers - compensates for clock domain mismatches between line and system clocks; configurable per CCR1.2/CCR1.7. |
| Control Interface | 8-bit multiplexed AD0–AD7 bus with Intel/Motorola timing - reduces MCU pin count; BTS pin selects bus protocol. |
| Alarm Detection | Loss of Sync (RLOS), Yellow/Blue Alarms, Loss of Clock (LOTC/LORC), Loop Up/Down codes - real-time status reporting via SR1/SR2 registers. |
| Output Clocks | TCHCLK/RLCLK = 192 kHz, TLCLK = 2/4 kHz - synchronized to channel timing for UART/LAPD interfacing and robbed-bit positioning. |
Pinout & Package
DS2141AQ+ is packaged in a 40-pin DIP (600-mil) with through-hole mounting. Pin functions are validated per Maxim DS2141A datasheet Rev. 0, pages 3–5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TCLK | Transmit Clock Input | 1.544 MHz primary clock source for transmit section; failure triggers LOTC alarm. |
| RCLK | Receive Clock Input | 1.544 MHz primary clock for receive section; loss detected as LORC event in SR2.0. |
| TSER / RSER | Transmit/Receive Serial Data | NRZ data I/O; sampled on falling edge of TCLK (TSER) and rising edge of RCLK (RSER). |
| TPOS / TNEG / RPOS / RNEG | Bipolar Data I/O | Differential bipolar outputs (TPOS/TNEG); differential inputs (RPOS/RNEG); NRZ mode enabled by tying RPOS/RNEG together. |
| AD0–AD7 | Multiplexed Address/Data Bus | Shared 8-bit path for register addressing and data transfer; latched by ALE(AS) signal. |
| INT1 / INT2 | Interrupt Outputs | Active-low open-drain alarms from Status Registers 1 and 2; maskable via IMR1/IMR2. |
| RLOS/LOTC | Dual-Function Output | PIN 34 toggles for RLOS (sync loss) or LOTC (transmit clock loss) based on CCR1.6 setting. |
| BTS | Bus Timing Select | Strap high for Motorola timing (ALE/WR/RD), low for Intel timing (CS/WR/RD) - determines control signal mapping. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Configurable Framing | Runtime selection of D4/ESF/SLC-96 via CCR2.7/CCR2.3 and RCR1/TCR1 registers - enables field-upgradable T1 interface behavior. |
| Robbed-Bit Signaling Engine | Extracts and inserts signaling bits per channel; supports ISDN-PRI B-channel signaling via Receive/Transmit Signaling Registers (60h–7Bh). |
| FDL Support Circuitry | Hardware-assisted Facility Data Link handling: LI_SDI/LI_CLK/LI_CS pins drive external line interface; FDL match/abort detection in SR2. |
| Programmable Elastic Store | Independent enable/disable of transmit/receive 2-frame buffers (CCR1.7/CCR1.2); slip events logged in SR1.4 and RIR.4/.3. |
| Error Monitoring & Counting | Real-time 16-bit BPV, CRC6, and frame error counters updated every second (SR2.5); saturating arithmetic prevents overflow wrap. |
| Loopback Modes | Local (LLB) and Payload (PLB) loopbacks controlled by CCR1.0/CCR1.1 - essential for production test and in-service diagnostics without external hardware. |
Applications
| ISDN-PRI Trunk Interface | T1 Channel Bank Controller |
|---|---|
Use Scenario: Aggregating 23 B-channels + 1 D-channel from multiple PRI lines into a VoIP gateway or PBX. IC Role / Device Role / Timing Role: DS2141AQ+ acts as the T1 framer coprocessor, extracting robbed-bit signaling and synchronizing to line clock while offloading framing tasks from host MCU. Use Value: Enables precise D-channel timing alignment and per-channel signaling bit extraction required for Q.921 LAPD frame assembly. |
Use Scenario: Building modular T1 multiplexers supporting fractional services (384 kbps, 768 kbps) and drop-and-insert functionality. IC Role / Device Role / Timing Role: DS2141AQ+ provides channel blocking (TCHBLK/RCHBLK), multiframe-aligned signaling, and elastic store jitter tolerance for mixed-rate service provisioning. Use Value: Allows dynamic channel allocation and blocking without MCU intervention, reducing latency in time-critical drop-and-insert paths. |
| Remote Line Test System | T1 Network Management Node |
Use Scenario: Deploying embedded test units in central offices to perform loop-up/down code detection and FDL-based remote diagnostics. IC Role / Device Role / Timing Role: DS2141AQ+ monitors incoming T1 stream for standardized loop codes (SR1.7/SR1.6) and reports FDL match/abort events (SR2.2/SR2.1). Use Value: Eliminates need for external pattern detectors; supports automated fault isolation with sub-50 ms loop code recognition at BER ≤10⁻². |
Use Scenario: Integrating into network element management cards that monitor T1 link health, alarm states, and performance metrics (BPV, CRC6, frame errors). IC Role / Device Role / Timing Role: DS2141AQ+ serves as the real-time telemetry engine, updating error counters every second and flagging alarms via INT1/INT2 to host processor. Use Value: Provides granular, register-accessible performance data aligned to 1-second intervals - directly usable for SNMP trap generation and SLA reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 framer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2142Q+ | Pin-compatible upgrade with enhanced jitter attenuation, integrated PLL, and extended temperature range (–40°C to +85°C). | Supports higher-jitter line conditions and industrial environments where DS2141AQ+ may lose sync. | Select DS2142Q+ when operating in noisy environments or requiring extended thermal reliability without PCB redesign. |
| MC145508P | Legacy Motorola T1 framer with fixed D4-only framing, no ESF/SLC-96 support, and no elastic store; requires external glue logic for register access. | Limited to basic D4 applications; lacks software configurability and modern alarm handling features. | Choose MC145508P only for cost-sensitive legacy D4-only designs where firmware reuse and feature expansion are not required. |
Compared with DS2141AQ+, DS2142Q+ offers superior jitter resilience and broader environmental tolerance, while MC145508P trades flexibility for simplicity in static D4 deployments - making DS2141AQ+ the optimal balance of programmability, standards coverage, and proven field reliability for mid-complexity T1 systems.
Availability
DS2141AQ+ is available at Aetrix Electronics and suitable for telecom access equipment, ISDN-PRI gateways, and T1 channel bank controllers requiring stable component supply, long-lifecycle support, and traceable sourcing for carrier-grade deployments.
Supply support for DS2141AQ+ 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 (acquired by Analog Devices in 2021) is a semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, industrial, and automotive markets.
The DS2141AQ+ belongs to Maxim's T1/E1 line interface product line, engineered specifically for carrier-class digital telephony infrastructure requiring robust framing, precise timing, and comprehensive alarm handling in space-constrained designs.
FAQ
What is the primary function of the DS2141AQ+ in a T1 system?
The DS2141AQ+ functions as a software-configurable T1 framing transceiver that synchronizes to incoming T1 streams, extracts and inserts framing bits (D4/ESF/SLC-96), handles robbed-bit signaling for ISDN-PRI, and interfaces with line drivers via its serial port (LI_SDI/LI_CLK/LI_CS). It relieves the host microcontroller from real-time T1 timing constraints while providing full register-level control over all framing parameters and alarm conditions.
Does the DS2141AQ+ support both D4 and ESF framing modes simultaneously?
No, the DS2141AQ+ operates in one framing mode at a time - selected independently for transmit (CCR2.7) and receive (CCR2.3) sides. This allows asymmetric configurations, such as receiving ESF while transmitting D4, but both sections cannot process two framing formats concurrently within a single device instance.
How does the elastic store in the DS2141AQ+ improve system timing robustness?
The DS2141AQ+ features dual independent 2-frame elastic stores (enable via CCR1.2 for receive, CCR1.7 for transmit) that absorb clock domain variations between line and system clocks. When enabled, they prevent data loss during minor frequency mismatches by repeating or deleting frames - events logged in SR1.4 and RIR.4/.3 - ensuring continuous data flow without MCU intervention.
Can the DS2141AQ+ generate interrupts for specific T1 alarm conditions?
Yes, the DS2141AQ+ provides two dedicated open-drain interrupt outputs (INT1 and INT2) tied to Status Registers 1 and 2. Individual alarms - including RLOS, LOTC, yellow/blue alarms, loop codes, and FDL events - can be selectively enabled or masked via Interrupt Mask Registers IMR1 (7Fh) and IMR2 (6Fh), allowing prioritized, software-directed response to critical line conditions.
What is the role of the BTS pin on the DS2141AQ+?
The BTS (Bus Type Select) pin configures the DS2141AQ+ parallel control port timing: strapped high for Motorola bus timing (ALE/WR/RD signals), or low for Intel timing (CS/WR/RD). This single-pin selection eliminates external logic, enabling direct connection to either 68k- or x86-based microcontrollers without signal translation or timing adaptation.
DS2141AQ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Interface:
- Parallel/Serial
- Number of Circuits:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 10mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
DS2141AQ+ FAQ
1.How can I place an order for DS2141AQ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2141AQ+ 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 DS2141AQ+ reliable?
The price and inventory of DS2141AQ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2141AQ+ is usually 5 days.
3.What payment methods are accepted for DS2141AQ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2141AQ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2141AQ+?
DS2141AQ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2141AQ+ 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 DS2141AQ+?
For technical support, including DS2141AQ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2141AQ+ requirements.
6.How does Aetrix verify that DS2141AQ+ is sourced from the original manufacturer or authorized distributors?
All DS2141AQ+ 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 DS2141AQ+ meets industry standards.
7.What is the process for return or replacement of DS2141AQ+?
All DS2141AQ+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2141AQ+, 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 DS2141AQ+ part is unused and in its original packaging.
Return procedure for DS2141AQ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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