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Analog Devices Inc./Maxim Integrated DS2141AN
- Part No.:
- DS2141AN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS2141AN.pdf
- Description:
- IC TELECOM INTERFACE 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,397
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Product details
Overview
DS2141AN from Maxim Integrated (now Analog Devices) is a T1 framing transceiver IC designed as a software-configurable slave framer for microcontroller-based telecom line cards. It supports D4, ESF, and SLC-96 framing formats; performs robbed-bit signaling extraction/insertion; features dual 2-frame elastic store buffers; and operates from a single 5V supply. Used in ISDN-PRI access equipment and T1 channel banks for frame synchronization and payload conditioning.
For engineers reviewing the DS2141AN datasheet, DS2141AN pinout, DS2141AN application, or DS2141AN equivalent, this page delivers verified technical context, exact pin functions, real-world timing roles, confirmed alternatives, and supply-ready procurement details - all grounded in the official DS2141A datasheet and Maxim's validated design documentation.
Technical Context
The DS2141AN implements fully independent transmit and receive sections with parallel bus control (Intel/Motorola selectable via BTS), enabling multi-T1 line management by a single host MCU. Its receive side locates frame/multiframe boundaries using ANSI T1.403-1989 and CCITT G.704-compliant sync detection logic, while extracting FDL, robbed-bit signaling, and error events including RLOS, yellow/blue alarms, and BPV/CRC6 violations.
Transmit functionality inserts framing bits (Ft/FPS), robbed-bit signaling, and FDL data; supports programmable output clocks (TCHCLK, TLCLK, RCHCLK at 192 kHz; TCLK/RCLK at 1.544 MHz); and provides hardware-assisted loopback modes (payload and local). Elastic store operation requires SYSCLK (1.544/2.048 MHz) and is controlled via CCR1.2/CCR1.7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1 Data Rate | 1.544 Mbps - matches standard T1 line rate; requires precise 1.544 MHz clock on TCLK/RCLK pins. |
| Framing Standards | D4, ESF, SLC-96 - full compliance with ANSI T1.403-1989, AT&T TR 62411, CCITT G.704/G.706. |
| Supply Voltage | 5.0 V ±5% - single-supply CMOS operation; no auxiliary voltages required. |
| Elastic Store | Dual 2-frame buffer - enables slip compensation; configurable per receive/transmit path via CCR1.2/CCR1.7. |
| Control Interface | 8-bit multiplexed AD0–AD7 bus - supports Intel/Motorola timing; uses ALE/CS/WR/RD signals for register access. |
| Alarm Detection | RLOS, LOTC, RCL, yellow/blue alarms - latched status bits in SR1/SR2 with maskable INT1/INT2 outputs. |
| Robbed-Bit Handling | Full extraction and insertion - programmable per-channel blocking via TTR/RTR registers; supports ISDN-PRI B-channel signaling. |
Pinout & Package
DS2141AN 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 |
|---|---|---|
| 1 (TCLK) | Transmit primary clock input | 1.544 MHz reference for transmit serial data timing; sampled on falling edge. |
| 2 (TSER) | Transmit serial data input | Unframed NRZ data accepted on falling edge of TCLK; framing inserted internally. |
| 3 (TCHCLK) | Transmit channel clock output | 192 kHz pulse synchronized to LSB of each T1 channel; used for parallel-to-serial conversion. |
| 6–13 (AD0–AD7) | Multiplexed address/data bus | Shared 8-bit path for register addressing and read/write data; demultiplexed by ALE(AS). |
| 14 (BTS) | Bus timing select | High = Motorola timing; low = Intel timing; determines function of RD/WR/ALE pins. |
| 22 (RCLK) | Receive primary clock input | 1.544 MHz reference for receive serial data sampling; rising-edge triggered. |
| 24 (RSER) | Receive serial data output | Framed NRZ data output; updated on rising edges of RCLK; includes extracted signaling bits. |
| 26–27 (RPOS/RNEG) | Differential receive inputs | Bipolar T1 line interface; sampled on falling edge of RCLK; tied together for NRZ mode. |
| 34 (RLOS/LOTC) | Dual-function alarm output | Configurable via CCR1.6: RLOS (loss of sync) or LOTC (loss of transmit clock); active-high toggle. |
| 35–36 (INT2/INT1) | Maskable interrupt outputs | Open-drain, active-low; assert on conditions defined in SR2/SR1; masked via IMR2/IMR1 registers. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable framing mode | D4, ESF, or SLC-96 selected independently for receive/transmit via CCR2.3/CCR2.7 - enables field-upgradable protocol support. |
| Hardware loopback modes | Payload loopback (PLB) and local loopback (LLB) activated via CCR1.1/CCR1.0 - eliminates external test cabling during bring-up and diagnostics. |
| FDL and signaling handling | On-chip FDL support circuitry and full robbed-bit extraction/insertion - reduces host MCU overhead for ISDN-PRI and CAS applications. |
| Real-time error monitoring | 16-bit BPV, CRC6, and frame error counters updated every second - enables SLA-compliant performance reporting without host polling overhead. |
| Sync boundary flexibility | RSYNC/TSYNC pins configurable as input or output for frame/multiframe alignment - supports master/slave timing architectures in hybrid systems. |
Applications
| ISDN-PRI Access Gateway | T1 Channel Bank |
|---|---|
|
Use Scenario: Aggregating 23 B-channels + 1 D-channel from multiple T1 lines into a VoIP or SS7 core network. IC Role / Device Role / Timing Role: DS2141AN acts as the T1 framer and signaling extractor, synchronizing to incoming T1 streams and delivering framed, robbed-bit–processed data to the packet gateway processor. Use Value: Enables deterministic D-channel bit extraction and B-channel payload framing per ANSI T1.606, reducing host firmware complexity and ensuring ISDN-PRI interop. |
Use Scenario: Providing line-terminated T1 service to enterprise PBX systems with integrated alarm reporting and loopback testing. IC Role / Device Role / Timing Role: DS2141AN serves as the physical layer framer, detecting RLOS, yellow/blue alarms, and generating INT1/INT2 alerts for OAM&P subsystems. Use Value: Delivers ANSI T1.403-compliant alarm states and 1-second error counters - directly feeding network management systems without custom parsing logic. |
| Remote Loopback Test System | Legacy TDM Multiplexer |
|
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: DS2141AN detects repeating 00001… (loop up) and 001… (loop down) patterns on RPOS/RNEG, asserting SR1.7/SR1.6 within 48 ms. Use Value: Hardware-accelerated loop code detection at BER ≤10⁻² eliminates need for real-time DSP processing - enabling low-cost, battery-operated field testers. |
Use Scenario: Integrating legacy T1 infrastructure with modern packet-switched backbones using fractional T1 (e.g., 384 kbps) services. IC Role / Device Role / Timing Role: DS2141AN configures TCHBLK/RCHBLK outputs to gate unused channels, while maintaining frame alignment across active time slots. Use Value: Per-channel blocking via register-controlled outputs allows dynamic bandwidth allocation without FPGA reconfiguration or PCB redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 framer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2142N | Pin-compatible upgrade with extended SLC-96 support, enhanced FDL handling, and improved jitter tolerance; same 40-pin DIP package. | Required for new designs targeting ZBTSI or stricter jitter specs; not drop-in for legacy DS2141A layouts requiring only D4/ESF. | Select DS2142N when upgrading for ZBTSI compatibility or when designing to GR-499-CORE jitter requirements. |
| MC145508P | Motorola T1 framer with D4/ESF support but no SLC-96, no elastic store, and no programmable output clocks; 28-pin DIP. | Limited to basic D4/ESF framing; lacks robbed-bit flexibility and hardware loopbacks - suitable only for cost-sensitive, fixed-configuration systems. | Choose MC145508P only for retrofitting simple D4-only line interfaces where DS2141AN's advanced features are unused. |
Compared with DS2141AN, DS2142N adds ZBTSI and jitter attenuation while retaining pinout and register mapping; MC145508P offers lower integration and no elastic store, making it viable only for minimal D4 applications with tight BOM constraints.
Availability
DS2141AN is available at Aetrix Electronics and suitable for ISDN-PRI gateways, T1 channel banks, remote loopback testers, and legacy TDM multiplexers requiring stable component supply across long-lifecycle telecom deployments.
Supply support for DS2141AN 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 power management ICs for communications, industrial, and computing markets.
The DS2141AN belongs to Maxim's T1/E1 framer product line, engineered specifically for carrier-class telecom infrastructure requiring ANSI/AT&T/CCITT-compliant framing, robust alarm handling, and microcontroller offload capabilities.
FAQ
What is the primary function of the DS2141AN in a T1 system?
The DS2141AN serves 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 a host microcontroller via an 8-bit parallel bus. Its role is to offload framing logic from the main processor while ensuring full ANSI T1.403-1989 and CCITT G.704 compliance - a core requirement in DS2141AN-based line card designs.
Does the DS2141AN support both D4 and ESF framing modes simultaneously?
No, the DS2141AN does not support simultaneous D4 and ESF operation. Receive and transmit framing modes are independently configured via CCR2.3 (RFM) and CCR2.7 (TFM), but each section operates in one mode at a time. For example, the receive side can be set to ESF (RFM=1) while the transmit side uses D4 (TFM=0), enabling format translation - a capability explicitly documented in the DS2141AN datasheet Section 3.0 and CCR2 register description.
How is elastic store functionality enabled and used in the DS2141AN?
Elastic store is enabled separately for receive and transmit paths using CCR1.2 (RESE) and CCR1.7 (TESE). When enabled, it uses onboard dual 2-frame buffers to absorb timing slips between RCLK and TCLK domains. SYSCLK (1.544/2.048 MHz) must be supplied, and RIR bits RESE/RRESF indicate buffer underflow/overflow. This feature is essential in DS2141AN applications where clock domain crossing introduces jitter or wander, such as in TDM-over-packet gateways.
Can the DS2141AN generate interrupts for specific alarm conditions like RLOS or yellow alarm?
Yes, the DS2141AN asserts active-low interrupts on INT1 and INT2 pins for configurable alarm conditions. RLOS, yellow alarm, blue alarm, and loss of transmit clock are mapped to Status Register 1 (SR1), while multiframe events and FDL conditions appear in SR2. Each bit is maskable via IMR1/IMR2 registers - allowing DS2141AN users to selectively enable only relevant alarms and reduce host MCU interrupt load in real-time systems.
What are the key differences between DS2141AN and DS2142N?
The DS2142N is a direct functional upgrade to the DS2141AN, adding ZBTSI support, enhanced FDL handling, and improved jitter attenuation while maintaining pin compatibility and identical register mapping. Unlike DS2141AN, DS2142N meets GR-499-CORE jitter specs and supports more flexible SLC-96 configurations - making it the recommended choice for new designs, whereas DS2141AN remains valid for legacy D4/ESF-only deployments with established layouts.
DS2141AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 40-PDIP
DS2141AN FAQ
1.How can I place an order for DS2141AN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2141AN 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 DS2141AN reliable?
The price and inventory of DS2141AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2141AN is usually 5 days.
3.What payment methods are accepted for DS2141AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2141AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2141AN?
DS2141AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2141AN 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 DS2141AN?
For technical support, including DS2141AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2141AN requirements.
6.How does Aetrix verify that DS2141AN is sourced from the original manufacturer or authorized distributors?
All DS2141AN 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 DS2141AN meets industry standards.
7.What is the process for return or replacement of DS2141AN?
All DS2141AN units undergo pre-shipment inspection (PSI). If there is an issue with DS2141AN, 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 DS2141AN part is unused and in its original packaging.
Return procedure for DS2141AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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