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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:1,362
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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 framer and controller for DS1/ISDN-PRI line interfaces. It performs full D4, ESF, and SLC-96 framing, supports robbed-bit signaling extraction/insertion, features dual 2-frame elastic stores, and operates from a 5V supply. It serves as a slave or coprocessor to microcontrollers in telecom access equipment.
For engineers reviewing the DS2141AQ datasheet, DS2141AQ pinout, DS2141AQ application, or DS2141AQ equivalent, this page delivers verified technical context on T1 framing architecture, register-controlled configuration, elastic store behavior, FDL handling, and alarm detection logic - all critical for embedded T1 line card design, ISDN-PRI gateway development, and legacy telecom infrastructure upgrades.
Technical Context
The DS2141AQ implements fully independent transmit and receive sections with parallel bus control (Intel/Motorola selectable), enabling simultaneous framing, de-framing, and signaling processing. Its dual elastic stores support slip compensation for clock domain crossing between RCLK (1.544 MHz) and SYSCLK (1.544/2.048 MHz), while programmable output clocks (TCHCLK, RLCLK, TLCLK) synchronize external channel logic and UARTs.
It integrates hardware-level FDL support, frame/multiframe sync generation, error-tolerant yellow/blue alarm detection, and comprehensive status/error registers (62 accessible 8-bit registers). The device complies with ANSI T1.403-1989, AT&T TR 62411, and CCITT G.704/G.706 - confirming its role in carrier-grade T1 termination and multiplexing systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1 Data Rate | 1.544 Mbps - matches standard DS1 line rate; requires precise 1.544 MHz RCLK/TCLK for synchronization. |
| Framing Standards | D4, ESF, SLC-96 - enables interoperability across North American T1 networks, including legacy PBX and modern ISDN-PRI deployments. |
| Elastic Store | Dual 2-frame buffers - compensates for timing slips between receive and transmit domains; configurable via CCR1.2/CCR1.7. |
| Supply Voltage | 5.0 V ±5% - single-supply CMOS operation; compatible with legacy 5V microcontroller buses and line interface ICs. |
| Control Interface | 8-bit multiplexed AD0–AD7 bus with ALE/CS/WR/RD - supports direct connection to Intel 80xx or Motorola 68xx families without glue logic. |
| Alarm Detection | Loss-of-sync (RLOS), loss-of-clock (LORC/LOTC), yellow/blue alarms, and 1's density violations - latched status bits enable deterministic interrupt-driven fault handling. |
| Signaling Support | Robbed-bit extraction/insertion + FDL handling - enables CAS signaling for voice trunking and maintenance data transport in ESF/D4 frames. |
Pinout & Package
DS2141AQ is packaged in a 40-pin DIP (600-mil) with through-hole mounting compatibility for legacy telecom PCBs and evaluation fixtures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TCLK | Transmit Clock Input | 1.544 MHz primary clock source for transmit section; timing reference for TSER sampling and frame generation. |
| RCLK | Receive Clock Input | 1.544 MHz primary clock for receive section; used to sample RPOS/RNEG and drive internal synchronizer. |
| TSER / RSER | Transmit/Receive Serial Data | NRZ data I/O; TSER accepts unframed data for insertion, RSER outputs framed data after de-framing and BPV correction. |
| TPOS / TNEG | Transmit Bipolar Outputs | Differential bipolar output pair for AMI/B8ZS line coding; driven on rising edge of TCLK. |
| RPOS / RNEG | Receive Bipolar Inputs | Differential inputs for AMI/B8ZS signals; sampled on falling edge of RCLK; bipolar violation monitoring enabled by default. |
| AD0–AD7 | Address/Data Bus | Multiplexed 8-bit bus for register access; latched by ALE(AS); supports both Intel and Motorola timing via BTS pin. |
| INT1 / INT2 | Interrupt Outputs | Active-low open-drain alarms - INT1 reports RLOS, RYEL, RBL; INT2 reports RMF, SEC, RFDL, LORC for modular interrupt handling. |
| RCHBLK / TCHBLK | Channel Block Outputs | Programmable per-channel gating signals - used to disable unused T1 channels in fractional services (e.g., 384 kbps ISDN-PRI). |
Key Features
| Feature | Design Value |
|---|---|
| Software-Configurable Framing | Runtime selection of D4/ESF/SLC-96 via CCR2.7/CCR2.3 and RCR1/TCR1 registers - eliminates hardware redesign for multi-standard deployments. |
| Onboard FDL Circuitry | Hardware-accelerated FDL insertion/extraction with match detection (RFDLM1/RFDLM2) - offloads microcontroller from bit-level FDL parsing in ESF networks. |
| Two-Level Elastic Store | Independent enable/disable of receive (RESE) and transmit (TESE) elastic stores - allows selective slip compensation without affecting latency-critical paths. |
| Payload Loopback (PLB) | Internal loop of corrected 192-bit payload only - enables in-system validation of framing integrity without external loopback cables or line interface ICs. |
| Comprehensive Alarm Counters | 16-bit BPV, CRC6, and frame error counters updated every second - provides standardized performance metrics for SLA reporting and network health monitoring. |
Applications
| ISDN-PRI Gateway | T1 Channel Bank |
|---|---|
|
Use Scenario: Aggregating 23 B-channels and 1 D-channel from multiple PRI lines into a VoIP core using DSP-based transcoding. IC Role / Device Role / Timing Role: DS2141AQ acts as the physical-layer framer, extracting robbed-bit signaling for D-channel processing and generating TCHCLK for channelized time-slot alignment. Use Value: Enables precise 192 kHz channel clocking and per-channel blocking (via TCHBLK) to isolate active B-channels, reducing DSP load and memory bandwidth. |
Use Scenario: Building a 96-channel T1 multiplexer for enterprise PBX interconnection with legacy D4 framing requirements. IC Role / Device Role / Timing Role: DS2141AQ performs D4 framing, extracts Fs-bit signaling, and generates RCHCLK to drive channelized analog-to-digital converters. Use Value: Hardware-based frame alignment and elastic store buffering ensure stable timing despite jitter on incoming T1 lines, meeting GR-474-CORE jitter tolerance specs. |
| Remote Loopback Test System | Carrier-Class T1 Demarcation Unit |
|
Use Scenario: Field-deployable test unit verifying end-to-end T1 circuit integrity using AT&T TR 62411 loop-up/down codes. IC Role / Device Role / Timing Role: DS2141AQ detects repeating 00001… (loop-up) and 001… (loop-down) patterns in real time and asserts LUP/LDN flags in SR1. Use Value: Eliminates need for external pattern generators or protocol analyzers - enables autonomous, standards-compliant loopback initiation and verification. |
Use Scenario: Carrier demarc device providing T1 signal conditioning, alarm injection, and performance monitoring at customer premises. IC Role / Device Role / Timing Role: DS2141AQ monitors RLOS, RYEL, RBL, and BPV counts, then drives yellow/blue alarm LEDs and triggers SNMP traps via microcontroller interface. Use Value: Real-time, latched status registers (SR1/SR2) and error counters provide auditable, timestamped fault records compliant with Telcordia GR-1089-CORE EMC and safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 framing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2141Q | Same silicon die; differs only in packaging (44-pin PLCC vs. 40-pin DIP) and screening - no functional or electrical distinction. | Requires different PCB footprint and reflow profile; PLCC variant suits surface-mount production but lacks DIP's prototyping flexibility. | Select DS2141Q only when automated SMT assembly is required and PLCC-compatible layout is available. |
| DS2152 | Single-chip T1/E1 framer with integrated line interface drivers; supports E1 (2.048 Mbps) in addition to T1; uses 3.3V core with 5V-tolerant I/O. | Reduces BOM count by eliminating external line interface ICs (e.g., DS2186/DS2187); not pin-compatible and requires new register mapping. | Choose DS2152 for new designs targeting dual T1/E1 support or lower power; retain DS2141AQ for drop-in replacement in existing 5V DIP-based T1-only systems. |
Compared with DS2141Q, the DS2141AQ offers identical functionality in a through-hole package ideal for lab validation and low-volume telecom hardware. Against DS2152, it trades integration and voltage flexibility for proven field reliability, simpler thermal management, and seamless compatibility with legacy 5V microcontroller buses and line interface peripherals.
Availability
DS2141AQ is available at Aetrix Electronics and suitable for T1 line card manufacturing, ISDN-PRI gateway development, and telecom infrastructure maintenance requiring stable component supply and long-term obsolescence mitigation.
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, now part of Analog Devices, is a leader in precision analog and mixed-signal ICs for communications, industrial, and automotive markets.
The DS2141AQ belongs to Maxim's legacy T1/E1 framer product line, engineered specifically for carrier-class digital telephony infrastructure where deterministic timing, standards compliance, and long-lifecycle support are mandatory.
FAQ
What is the primary function of the DS2141AQ in a T1 system?
The DS2141AQ functions as a software-configurable T1 framing transceiver that performs full D4, ESF, and SLC-96 framing/de-framing, robbed-bit signaling extraction and insertion, and FDL handling. In a T1 system, the DS2141AQ sits between the line interface IC (e.g., DS2186/DS2187) and the host microcontroller, acting as a coprocessor to offload real-time framing tasks while maintaining strict ANSI T1.403 and CCITT G.704 compliance.
Does the DS2141AQ support both D4 and ESF framing modes simultaneously?
No, the DS2141AQ operates in one framing mode at a time - selected via CCR2.7 (transmit) and CCR2.3 (receive). While it can be reconfigured in software between D4 and ESF, it does not process both formats concurrently. Each mode dictates distinct frame structure, CRC usage, FDL location, and alarm behavior - confirmed in the DS2141AQ register map and timing diagrams for RSYNC/TSYNC pulse generation.
How does the elastic store in the DS2141AQ handle clock domain mismatches?
The DS2141AQ implements two independent 2-frame elastic stores - one for receive (enabled via CCR1.2) and one for transmit (via CCR1.7). When enabled, each store absorbs timing slips by repeating or deleting entire T1 frames, using SYSCLK (1.544/2.048 MHz) as the reference. Status bits RIR.4 (RESF) and RIR.3 (RESE) flag full/empty conditions, while SR1.4 (SLIP) indicates occurrence - enabling firmware to adjust buffer depth or trigger alarms without data corruption.
Can the DS2141AQ generate valid T1 output without an external line interface IC?
No, the DS2141AQ does not include line driver/receiver circuitry. Its TPOS/TNEG and RPOS/RNEG pins deliver/receive bipolar NRZ signals but require external AMI/B8ZS line interface ICs (e.g., DS2186 for transmit, DS2187 for receive) to convert to/from the balanced T1 line waveform. The DS2141AQ's LI_CS/LI_CLK/LI_SDI pins are explicitly designed to control such companion devices, confirming its role as a framer-not a complete PHY.
What interrupt sources are available on the DS2141AQ, and how are they managed?
The DS2141AQ provides two open-drain interrupt outputs: INT1 (for RLOS, RYEL, RBL, LOTC, etc.) and INT2 (for RMF, SEC, RFDL, LORC, etc.), each mapped to Status Registers SR1 and SR2. Interrupt masking is controlled independently via IMR1 (7Fh) and IMR2 (6Fh), allowing selective enabling/disabling of individual alarms. Reading SR1 or SR2 clears latched bits, enabling precise, non-destructive polling - a key feature confirmed in Section 4.0 of the DS2141AQ datasheet.
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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