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Analog Devices Inc./Maxim Integrated DS2180AQ+
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- Part No.:
- DS2180AQ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS2180AQ+.pdf
- Description:
- IC TELECOM INTERFACE 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,006
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Product details
Overview
DS2180AQ+ from Maxim Integrated (now Analog Devices) is a monolithic CMOS T1 transceiver IC implementing primary-rate (1.544 Mbps) DS1 line interface functionality with full 193S and 193E framing support, B7/B8ZS zero-suppression, and dual-mode serial/hardware configuration. It performs transmit framing, receive synchronization, robbed-bit signaling extraction/insertion, and alarm monitoring for telecom access equipment.
For engineers reviewing the DS2180AQ+ datasheet, DS2180AQ+ pinout, DS2180AQ+ application, or DS2180AQ+ equivalent, this device serves as a single-chip solution for T1 line interface design requiring configurable framing, robust error detection (FERR, RLOS, B8ZSD), channel-level transparency control, and industrial-temperature operation in carrier-class edge systems.
Technical Context
The DS2180AQ+ integrates independent transmit framer/formatter and receive synchronizer blocks sharing a unified control architecture. Its transmit side generates framing bits (FT/FPS), inserts robbed-bit signaling (ABCD), applies B7 stuffing or B8ZS encoding, and outputs bipolar/NRZ data with precise TCLK-synchronized timing. The receive side extracts frame/multiframe alignment (RFSYNC/RMSYNC), recovers signaling data (RABCD), detects carrier loss (RCL), bipolar violations (RBV), and frame errors (RFER).
Configuration occurs via either processor mode (serial port: SDI/SDO/SCLK/CS/SPS) supporting 16 registers including RSR, CCR, TCR, RCR, or hardware mode using hard-wired pins (TSIGSEL, TSIGFR, TABCD, TLINK). Framing mode (193S/193E), zero-suppression type, and signaling state are programmable per-channel via TTR/RMR registers - enabling mixed clear/non-clear DS0 channel operation on one DS1 link.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 1.544 Mbps - matches T1 line rate; requires precise 1.544 MHz TCLK/RCLK input for bit-level timing compliance. |
| Framing Modes | 193S (12-frame superframe) and 193E (24-frame extended superframe) - selectable via CCR.4; determines FT/FPS pattern, signaling frame positions, and yellow alarm format. |
| Zero Suppression | B7 stuffing and B8ZS - mutually exclusive modes controlled by CCR.1/CCR.2; maintains 1's density without corrupting clear-channel data integrity. |
| Supply Voltage | 5.0 V ±5% - single-rail CMOS operation; compatible with legacy T1 system power domains. |
| Operating Temp | –40°C to +85°C - industrial temperature grade confirmed by DS2180AN/DS2180AQN suffix variants; ensures reliability in outdoor cabinets and central office environments. |
| Interface Mode | Processor mode (SPI-like serial port) or hardware mode - defines whether external MCU configures registers or pins directly set function (e.g., clear channel selection). |
| Alarm Outputs | RLOS, RFER, RBV, RCL, RYEL, RBL - discrete open-drain status flags with interrupt capability (INT pin); enables real-time fault isolation without polling. |
Pinout & Package
DS2180AQ+ uses a 40-pin DIP (600-mil) surface-mount package. Pin functions are validated per DS2180A datasheet Figures 1–4 and Tables 1–4. All pins match DS2180A pinout; "Q" suffix denotes surface-mount variant of same die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TCLK / RCLK | Primary clock I/O | 1.544 MHz bidirectional reference; TCLK drives transmit timing, RCLK samples receive bipolar inputs (RPOS/RNEG); critical for jitter tolerance and bit alignment. |
| TMSYNC / TFSYNC | Transmit sync inputs | Establish multiframe/frame boundaries; flexible timing options (pulsed or continuous) allow interoperability with legacy line timing sources. |
| RFSYNC / RMSYNC | Receive sync outputs | 8 kHz frame sync and 125 µs multiframe sync pulses extracted from incoming signal; used for downstream demultiplexing and channel timing. |
| TSER / RSER | Serial data I/O | NRZ transmit input (sampled on TCLK falling edge); NRZ receive output (updated on RCLK rising edge); supports direct connection to FPGA or DSP interfaces. |
| TPOS / TNEG | Bipolar transmit outputs | Differential bipolar line drivers; updated on TCLK rising edge; meet ANSI T1.102 electrical specifications for T1 line driving. |
| RPOS / RNEG | Bipolar receive inputs | Differential bipolar line receivers; sampled on RCLK falling edge; include built-in bipolar violation (RBV) and carrier loss (RCL) detection logic. |
| INT | Interrupt output | Active-low open-drain alarm flag; asserts on any unmasked condition (RLOS, RFER, etc.); reduces host polling overhead in embedded systems. |
| SDI / SDO / SCLK / CS / SPS | Serial configuration port | MICROPROCESSOR-COMPATIBLE SPI INTERFACE (LSB-first, 8-bit address/data); SPS selects processor vs. hardware mode; enables runtime reconfiguration of framing, signaling, and alarms. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel transparency control | Configurable via TTR1–TTR3 registers - allows selective disabling of robbed-bit signaling and B7 stuffing on individual DS0 channels for ISDN/data-only applications. |
| Programmable alarm masking | RIMR register enables/disables interrupts per alarm type (RLOS, RFER, RBV, etc.) - prevents spurious host interrupts during transient line faults. |
| Two framing standards in one IC | Single hardware supports both 193S (D4) and 193E (ESF) - eliminates need for separate parts in multi-standard deployments or field-upgradeable systems. |
| On-chip performance monitoring | BVCR (8-bit bipolar violation counter) and ECR (dual 4-bit OOF/ESF counters) - provides quantifiable link health metrics without external logic or software overhead. |
| Hardware mode operation | No external processor required - pins 14–18 repurposed as hard-wired selects (e.g., TSIGSEL, TSIGFR) for fixed-function standalone T1 interface cards. |
Applications
| Channel Bank Interface | T1 Network Access Server |
|---|---|
|
Use Scenario: Aggregating 24 analog voice lines into a T1 trunk for PSTN interconnection. IC Role / Device Role / Timing Role: DS2180AQ+ acts as line-side transceiver, framing incoming PCM data, inserting ABCD signaling, and detecting yellow/blue alarms per Telcordia GR-499. Use Value: Enables single-chip T1 termination with full robbed-bit support and 193S/193E compatibility - reducing BOM count and board space versus discrete framer + LIU solutions. |
Use Scenario: Providing T1 WAN connectivity in enterprise routers or SD-WAN edge devices. IC Role / Device Role / Timing Role: DS2180AQ+ serves as physical layer interface, recovering frame sync (RFSYNC), extracting FDL data (RLINK), and reporting carrier loss (RCL) to network stack. Use Value: Delivers deterministic alarm reporting (RLOS, RFER) and configurable zero-suppression - ensuring rapid failover and compliance with RFC 2544 service-level monitoring. |
| Remote Terminal Unit (RTU) | Digital Loop Carrier (DLC) System |
|
Use Scenario: Outdoor cabinet housing T1-based SCADA telemetry for utility substations. IC Role / Device Role / Timing Role: DS2180AQ+ operates in industrial temp range (–40°C to +85°C), performing receive synchronization and bipolar violation detection on noisy copper loops. Use Value: Built-in RCL and RBV detection replaces external comparators and timers - improving MTBF and simplifying environmental qualification testing. |
Use Scenario: DLC remote node converting copper pair signals to T1 backhaul for central office switching. IC Role / Device Role / Timing Role: DS2180AQ+ handles transmit framing (TMSYNC/TFSYNC), idle code insertion (TIR registers), and mixed clear/non-clear channel support per ITU-T G.704. Use Value: Per-channel transparency (TTR registers) allows simultaneous voice (robbed-bit) and data (transparent) DS0s - eliminating need for separate T1 links or protocol converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2181A+ | Pin-compatible upgrade with enhanced jitter tolerance (±50 ppm vs. ±100 ppm), integrated loopback test mode, and improved B8ZS detection accuracy. | Preferred for new designs requiring higher timing margin in long-haul or regenerated spans; retains identical register map and pinout. | Select DS2181A+ when deploying in high-jitter environments or requiring simplified production test via internal loopback. |
| MC145508P | Legacy 28-pin DIP; supports only 193S framing; no B8ZS; no serial configuration port - requires external logic for signaling and alarm handling. | Suitable only for cost-sensitive, fixed-configuration 193S-only systems where firmware flexibility is unnecessary. | Choose MC145508P only for legacy repair or ultra-low-cost replacements where DS2180AQ+ features (193E, B8ZS, serial port) are unused. |
Compared with DS2180AQ+, DS2181A+ offers measurable jitter improvement and testability gains without layout changes, while MC145508P sacrifices configurability and modern framing support for minimal BOM cost - making DS2180AQ+ the balanced choice for field-deployable, standards-compliant T1 interfaces.
Availability
DS2180AQ+ is available at Aetrix Electronics and suitable for telecom access equipment, digital loop carrier systems, and T1-based industrial communications requiring stable component supply, long-term lifecycle assurance, and industrial-temperature operation.
Supply support for DS2180AQ+ 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 high-performance signal processing and interface ICs for communications, industrial, and automotive markets.
The DS2180AQ+ belongs to Maxim's legacy T-carrier transceiver product line, engineered specifically for carrier-grade T1/E1 line interface units requiring low-power CMOS integration, multi-standard framing, and robust alarm monitoring in harsh environments.
FAQ
What framing standards does the DS2180AQ+ support?
The DS2180AQ+ supports both 193S (12-frame D4 superframe) and 193E (24-frame ESF extended superframe) framing standards. Selection is made via the Frame Mode Select bit (CCR.4) in the Common Control Register. Each mode defines distinct frame sync patterns (FT/FPS), signaling frame locations, and yellow alarm formats - enabling interoperability with legacy and modern T1 networks without hardware change.
How does the DS2180AQ+ handle zero suppression for clear-channel applications?
The DS2180AQ+ implements two zero-suppression modes: B7 stuffing (CCR.1) and B8ZS (CCR.2), which are mutually exclusive. B8ZS replaces eight consecutive zeros with a defined code word, preserving data integrity for clear-channel services like ISDN or leased-line data. B7 forces bit-7 to '1' in all-zero channels - suitable for older voice-centric systems. Both modes are globally enabled but can be disabled per channel via TTR registers.
Can the DS2180AQ+ operate without a microcontroller?
Yes, the DS2180AQ+ supports hardware mode operation. When SPS is tied to VSS, pins 14–18 (INT, SDI, SDO, SCLK, CS) become hard-wired control inputs (e.g., TSIGSEL, TSIGFR, TABCD) instead of a serial port. This enables standalone T1 interface functionality - ideal for fixed-configuration line cards where firmware overhead is undesirable. Configuration is set at power-up via external logic levels.
What alarm conditions does the DS2180AQ+ monitor and report?
The DS2180AQ+ monitors and reports six key alarm conditions: Receive Loss of Sync (RLOS), Receive Frame Error (RFER), Receive Bipolar Violation (RBV), Receive Carrier Loss (RCL), Receive Yellow Alarm (RYEL), and Receive Blue Alarm (RBL). Each has dedicated open-drain output pins and corresponding status bits in the Receive Status Register (RSR), allowing both immediate hardware response and register-based diagnostics.
Is the DS2180AQ+ pin-compatible with other devices in the DS2180 family?
Yes, the DS2180AQ+ shares identical pinout and register mapping with DS2180A, DS2180AN, and DS2180AQN variants. The "Q" suffix denotes surface-mount DIP packaging, while "N" indicates industrial temperature grade. All variants use the same 40-pin DIP footprint and electrical interface - enabling drop-in replacement across temperature and packaging requirements without PCB redesign.
DS2180AQ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Transceiver
- Interface:
- T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 3mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
DS2180AQ+ FAQ
1.How can I place an order for DS2180AQ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2180AQ+ 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 DS2180AQ+ reliable?
The price and inventory of DS2180AQ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2180AQ+ is usually 5 days.
3.What payment methods are accepted for DS2180AQ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2180AQ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2180AQ+?
DS2180AQ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2180AQ+ 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 DS2180AQ+?
For technical support, including DS2180AQ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2180AQ+ requirements.
6.How does Aetrix verify that DS2180AQ+ is sourced from the original manufacturer or authorized distributors?
All DS2180AQ+ 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 DS2180AQ+ meets industry standards.
7.What is the process for return or replacement of DS2180AQ+?
All DS2180AQ+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2180AQ+, 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 DS2180AQ+ part is unused and in its original packaging.
Return procedure for DS2180AQ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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