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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

Analog Devices Inc./Maxim Integrated DS2182N

Name: DS2182N
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS2182N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS2182N

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Specialized

Package:: 28-DIP (0.600", 15.24mm)

Datasheet:: DS2182N.pdf

Description:: IC MONITOR LINE T1 IND 28-DIP

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Product details

Overview

DS2182N from Maxim Integrated is a T1 line monitor IC designed for real-time framing, error counting, and alarm detection in digital telephony infrastructure. It supports both Superframe (193S) and Extended Superframe (193E) formats, features four on-board error counters (16-bit bipolar violation, 8-bit CRC, 8-bit OOF, 8-bit frame bit error), and operates across –40°C to +85°C in a 28-pin DIP package for telecom central office and remote terminal applications.

For engineers reviewing the DS2182N datasheet, DS2182N pinout, DS2182N application, or DS2182N equivalent, this device delivers synchronized receive timing outputs (RCLK, RCHCLK, RFSYNC, RMSYNC), serial configuration via SPI-compatible interface, and latched alarm status reporting - critical for T1 line integrity monitoring, carrier-grade network element design, and legacy telecom equipment maintenance.

Technical Context

The DS2182N implements a dual-mode framing synchronizer supporting ANSI T1.231-compliant 193S and 193E formats, with programmable sync criteria (RCR1.3), sync time (RCR1.2), and auto-resync enable (RCR1.1). Its receive path accepts NRZ data at 1.544MHz via RPOS/RNEG inputs and generates channel-aligned outputs including RABCD (ABCD signaling), RSIGFR (signaling frame flag), and RLINK (FDL/S-bit data).

Internal register architecture includes eleven 8-bit control/status registers accessible via a 3-wire serial port (SDI/SDO/SCLK/CS), with burst-read capability and automatic counter reset (RCR1.4). Alarm logic detects yellow/blue alarms, carrier loss (192 consecutive zeros), bipolar violations, OOF events, and severely errored framing events - all reported through latched status bits and dedicated open-drain outputs (INT, RYEL, RLOS, RFER, RBV, RCL).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	5.0V single supply; enables direct integration into legacy T1 line card power domains without level-shifting.
Data Rate Support	1.544MHz T1 line rate; precisely tracks incoming signal timing for accurate frame alignment and bit-level error detection.
Framing Modes	ANSI T1.231-compliant Superframe (193S) and Extended Superframe (193E); selectable via RCR2.4 bit.
Error Counters	Four independent hardware counters: 16-bit BVCR (bipolar violations), 8-bit CRCCR (CRC errors), 8-bit OOFCR (OOF events), 8-bit FECR (frame bit errors); support preset thresholds and saturation-triggered interrupts.
Operating Temperature	–40°C to +85°C; qualified for deployment in uncontrolled telecom cabinets and outdoor remote terminals.
Package	28-pin DIP (600 mil); provides through-hole mounting compatibility with legacy backplane designs and serviceable field-replaceable modules.
Alarm Outputs	Dedicated open-drain outputs (RYEL, RLOS, RFER, RBV, RCL) with latched status in RSR1/RSR2; enable immediate hardware-level fault response without CPU polling.

Pinout & Package

DS2182N is housed in a 28-pin dual in-line package (DIP) with 0.6-inch width, compatible with standard IC sockets and wave-solder assembly processes used in telecom line cards.

Pin/Terminal	Circuit Role	Design Meaning
1 INT	Receive Alarm Interrupt	Open-drain active-low interrupt flag signaling any enabled alarm condition (yellow, blue, loss-of-sync, etc.) to host controller.
2 SDI	Serial Data Input	Host writes register address/command and data; sampled on rising edge of SCLK for reliable SPI-like configuration.
3 SDO	Serial Data Output	Host reads status/control registers; updated on falling edge of SCLK and tri-stated when CS is high or during write cycles.
4 CS	Chip Select	Active-low enable for serial port access; must be low for all read/write operations; high state disables port and tri-states SDO.
5 SCLK	Serial Clock	Host-generated clock synchronizing serial data transfers; rising edge latches SDI, falling edge updates SDO.
7 RYEL	Receive Yellow Alarm	Active-high output indicating yellow alarm detection per ANSI T1.231; transitions low when alarm clears.
10 RCLK	Receive Clock	1.544MHz input clock derived from T1 line; serves as primary timing reference for internal sampling and output generation.
14 VSS	Signal Ground	0V reference for all analog and digital circuitry; must be connected to system ground plane for noise immunity.
15 RFSYNC	Receive Frame Sync	8kHz extracted F-bit timing signal, one RCLK wide; identifies exact frame boundary for downstream demuxing.
16 RMSYNC	Receive Multiframe Sync	50% duty cycle multiframe start indicator; positive edge marks beginning of 12-frame (193S) or 24-frame (193E) superframe.
17 RABCD	Receive ABCD Signaling	Extracted channel-associated signaling bits; valid during signaling frames, LSB of channel word otherwise.
20 TEST	Test Mode Input	Must be tied to VSS for normal operation; enables factory test modes when pulled high.
21 RST	Reset Input	High-to-low transition clears all registers and initiates resync; high-to-low-to-high sequence forces immediate resync without full reset.
22 RPOS / 23 RNEG	Bipolar Data Inputs	Differential NRZ inputs sampled on falling edge of RCLK; connect together for unipolar mode and disable bipolar violation monitoring.
24 RCL	Receive Carrier Loss	Active-high output asserted after 192 consecutive zeros; cleared upon detection of ≥12.5% ones density.
25 RBV	Receive Bipolar Violation	Active-high pulse during accused bit time at RSER; indicates violation of AMI/B8ZS encoding rules.
26 RFER	Receive Frame Error	Active-high pulse at F-bit time for FT/FS (193S) or FPS/CRC (193E) errors; low-high-low for CRC6 errors in 193E.
27 RLOS	Receive Loss-of-Sync	Active-high during resynchronization; low when stable frame/multiframe alignment is achieved.
28 VDD	Positive Supply	+5.0V supply for CMOS core and I/O; requires local 0.1µF bypass capacitor to VSS for noise suppression.

Key Features

Feature	Design Value
Programmable Framing Mode	Selects 193S or 193E via RCR2.4, enabling interoperability with legacy D4 and modern ESF-based T1 networks.
Auto Counter Reset	RCR1.4 enables hardware-reset of all four error counters on any serial port read, simplifying periodic status polling without software overhead.
Severely Errored Framing Event Detection	SEFE flag (RSR2.7) triggers on two out of six framing bit errors, meeting ANSI T1.231 SES (Severely Errored Second) threshold requirements.
B8ZS Codeword Detection	RBL and B8ZSD flags detect blue alarm (AIS) and B8ZS substitution patterns independently of B8ZS enable state, supporting transparent monitoring of encoded lines.
Configurable Sync Algorithm	RCR1.3 and RCR1.2 allow tuning of resync robustness (24-bit validation) vs. speed (10-bit validation), optimizing trade-off between false-framing immunity and reframe time (3.75ms avg for 193S).

Applications

Channel Bank Monitoring	T1 Line Card Diagnostics
Use Scenario: Real-time health monitoring of T1 trunks connecting PBX systems to central offices. IC Role / Device Role / Timing Role: DS2182N performs frame synchronization, counts bipolar violations and CRC errors, and asserts RYEL/RLOS outputs to trigger upstream alarm reporting. Use Value: Enables predictive maintenance by correlating 16-zero string detection (RSR1.6) and carrier loss (RCL) with physical layer degradation before service interruption.	Use Scenario: Embedded diagnostics in modular T1 line interface cards for carrier-class access multiplexers. IC Role / Device Role / Timing Role: DS2182N supplies RCHCLK (192kHz), RFSYNC (8kHz), and RABCD outputs to offload timing and signaling extraction from host FPGA/MCU. Use Value: Reduces host processor load by >70% compared to software-based framing analysis, while providing deterministic latency for real-time alarm response.
Remote Terminal Unit (RTU)	Digital Loop Carrier (DLC) System
Use Scenario: Unattended monitoring of T1 links in roadside cabinets or cell site shelters with wide temperature variation. IC Role / Device Role / Timing Role: DS2182N operates across –40°C to +85°C, using RST-initiated resync and latched RSR1/RSR2 status for autonomous fault logging over serial interface. Use Value: Eliminates need for external temperature-compensated oscillators or watchdog timers, lowering BOM cost and board space by 32% versus discrete timing solutions.	Use Scenario: Fault isolation in DLC systems where multiple T1 lines serve DSLAMs or fiber nodes. IC Role / Device Role / Timing Role: DS2182N's burst-read mode allows single MCU to poll counters across 8+ T1 lines in <15ms, with automatic counter reset (RCR1.4) ensuring no event loss. Use Value: Supports scalable multi-line monitoring architecture with <100µs interrupt latency for yellow alarm (RYEL) and carrier loss (RCL) events.

Channel Bank Monitoring

T1 Line Card Diagnostics

Use Scenario: Real-time health monitoring of T1 trunks connecting PBX systems to central offices.

IC Role / Device Role / Timing Role: DS2182N performs frame synchronization, counts bipolar violations and CRC errors, and asserts RYEL/RLOS outputs to trigger upstream alarm reporting.

Use Value: Enables predictive maintenance by correlating 16-zero string detection (RSR1.6) and carrier loss (RCL) with physical layer degradation before service interruption.

Use Scenario: Embedded diagnostics in modular T1 line interface cards for carrier-class access multiplexers.

IC Role / Device Role / Timing Role: DS2182N supplies RCHCLK (192kHz), RFSYNC (8kHz), and RABCD outputs to offload timing and signaling extraction from host FPGA/MCU.

Use Value: Reduces host processor load by >70% compared to software-based framing analysis, while providing deterministic latency for real-time alarm response.

Remote Terminal Unit (RTU)

Digital Loop Carrier (DLC) System

Use Scenario: Unattended monitoring of T1 links in roadside cabinets or cell site shelters with wide temperature variation.

IC Role / Device Role / Timing Role: DS2182N operates across –40°C to +85°C, using RST-initiated resync and latched RSR1/RSR2 status for autonomous fault logging over serial interface.

Use Value: Eliminates need for external temperature-compensated oscillators or watchdog timers, lowering BOM cost and board space by 32% versus discrete timing solutions.

Use Scenario: Fault isolation in DLC systems where multiple T1 lines serve DSLAMs or fiber nodes.

IC Role / Device Role / Timing Role: DS2182N's burst-read mode allows single MCU to poll counters across 8+ T1 lines in <15ms, with automatic counter reset (RCR1.4) ensuring no event loss.

Use Value: Supports scalable multi-line monitoring architecture with <100µs interrupt latency for yellow alarm (RYEL) and carrier loss (RCL) events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar T1 line monitoring applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS2182	0°C to +70°C operating range; identical pinout, register map, and feature set except extended temperature qualification.	Suitable only for controlled indoor environments such as central office racks with active climate control.	Select DS2182N when ambient temperature exceeds +70°C or drops below 0°C, as in outdoor cabinets or mobile base stations.
DS2182QN	28-pin PLCC package instead of DIP; same –40°C to +85°C rating and electrical specifications.	Required for surface-mount assembly lines or space-constrained PCB layouts where through-hole DIP is incompatible.	Choose DS2182QN when automated SMT placement is mandatory and board real estate is limited, accepting reflow soldering process requirements.

Compared with DS2182 and DS2182QN, the DS2182N uniquely combines industrial temperature range with through-hole DIP packaging - enabling drop-in replacement in legacy field-deployed line cards without layout or thermal redesign, while maintaining full functional equivalence to the DS2182A family.

Availability

DS2182N is available at Aetrix Electronics and suitable for telecom infrastructure upgrades, T1 line card refurbishment, and remote terminal unit (RTU) deployments requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for DS2182N 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 semiconductor company specializing in precision analog, mixed-signal, and power management ICs for communications, industrial, and computing applications.

The DS2182N belongs to Maxim's T1/E1 line interface and monitoring product line, engineered specifically for carrier-grade digital telephony equipment requiring ANSI T1.231 compliance, deterministic alarm response, and long-term reliability in harsh environments.

FAQ

What is the primary function of the DS2182N in a T1 system?

The DS2182N serves as a dedicated T1 line monitor IC that performs real-time framing synchronization, error counting (bipolar violations, CRC, OOF, frame bit errors), and alarm generation (yellow, blue, loss-of-sync, carrier loss) for 1.544Mbps digital telephony links. It extracts timing signals (RCLK, RCHCLK, RFSYNC) and signaling data (RABCD, RLINK) to offload these functions from the host processor, enabling robust, standards-compliant T1 line integrity monitoring in carrier infrastructure.

Does the DS2182N support both Superframe and Extended Superframe formats?

Yes, the DS2182N supports both ANSI T1.231-compliant framing formats: Superframe (193S, 12-frame) and Extended Superframe (193E, 24-frame). Format selection is controlled by the FM bit (RCR2.4) - setting it to 0 selects 193S, and setting it to 1 selects 193E. The DS2182N automatically adapts its CRC checking, FDL interpretation, and yellow alarm detection logic based on the selected mode, ensuring full interoperability across legacy and modern T1 networks.

How does the DS2182N handle loss-of-sync recovery?

Upon detecting loss-of-sync (RLOS = 1), the DS2182N initiates an off-line resynchronization search using programmable criteria. The sync algorithm validates either 10 (RCR1.2 = 0) or 24 (RCR1.2 = 1) consecutive framing bits, with optional CRC6 verification in 193E mode (RCR1.3 = 1). Resync can be triggered automatically (RCR1.1 = 0) on OOF or carrier loss, or manually via RST pin or RCR1.0 bit. During resync, RLOS remains high and RSIGFR is forced low, while output timing holds previous alignment until new multiframe lock is achieved.

What are the key timing outputs provided by the DS2182N?

The DS2182N provides five critical timing outputs synchronized to the incoming T1 stream: RCLK (1.544MHz receive clock), RCHCLK (192kHz channel clock marking timeslot boundaries), RFSYNC (8kHz frame sync pulse aligned to F-bit position), RMSYNC (multiframe sync edge marking superframe start), and RLCLK (4kHz demand clock for RLINK data). These outputs eliminate the need for external PLLs or dividers in T1 line cards, directly feeding FPGAs, DSPs, or channel banks with jitter-controlled, phase-locked timing references.

Can the DS2182N monitor B8ZS-encoded T1 lines?

Yes, the DS2182N fully supports B8ZS (Bipolar with 8-Zero Substitution) encoded T1 lines. Its B8ZS detection logic (B8ZSD flag in RSR1.2) identifies B8ZS codewords regardless of whether B8ZS mode is enabled (RCR2.2 = 1). When B8ZS is enabled, the bipolar violation counter (BVCR) excludes B8ZS codewords from violation counts. Additionally, the DS2182N can be configured (RCR2.5 = 1) to count excessive zero strings (8 or 16 consecutive zeros), providing visibility into line coding integrity even under B8ZS substitution.

DS2182N Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 28-DIP (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

Applications:: Monitors

Interface:: Serial

Voltage - Supply:: 4.5V ~ 5.5V

Supplier Device Package:: 28-PDIP

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

DS2182N FAQ

1.How can I place an order for DS2182N through Aetrix?

Please submit a Request for Quotation (RFQ) for DS2182N 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 DS2182N reliable?

The price and inventory of DS2182N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2182N is usually 5 days.

3.What payment methods are accepted for DS2182N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2182N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS2182N?

DS2182N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS2182N 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 DS2182N?

For technical support, including DS2182N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2182N requirements.

6.How does Aetrix verify that DS2182N is sourced from the original manufacturer or authorized distributors?

All DS2182N 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 DS2182N meets industry standards.

7.What is the process for return or replacement of DS2182N?

All DS2182N units undergo pre-shipment inspection (PSI). If there is an issue with DS2182N, 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 DS2182N part is unused and in its original packaging.

Return procedure for DS2182N:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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