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

Analog Devices Inc./Maxim Integrated DS2176Q/T&R

Name: DS2176Q/T&R
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS2176Q/T&R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS2176Q/T&R

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Telecom

Package:: 28-LCC (J-Lead)

Datasheet:: DS2176Q/T&R.pdf

Description:: IC TELECOM INTERFACE 28PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

DS2176Q/T&R from Maxim Integrated (now part of Analog Devices) is a low-power CMOS T1 receive buffer IC designed to synchronize loop-timed T1 PCM data streams (1.544 MHz) to system-side timing, extract and supervise robbed-bit ABCD signaling, and provide slip-compensated multiframe alignment. It features a 2-frame (386-bit) buffer, 24-pin SOIC package, industrial-grade temperature range (–40°C to +85°C), and compatibility with DS2180A transceivers in digital trunk and cross-connect systems.

For engineers reviewing the DS2176Q/T&R datasheet, DS2176Q/T&R pinout, DS2176Q/T&R application, or DS2176Q/T&R equivalent, key selection considerations include frame-slip handling at boundary-aligned intervals, dual-rate clock selection (1.544/2.048 MHz), signaling freeze during alarm/slip, and parallel/serial backplane interface flexibility via S/P control.

Technical Context

The DS2176Q/T&R implements a deterministic 2-frame deep FIFO buffer synchronized between RCLK (receive clock) and SYSCLK (system clock), with slip detection triggered only on frame boundaries and signaled via open-collector SLIP output held low for exactly 65 SYSCLK cycles. Buffer depth is monitored in real time by comparing RMSYNC (receive multiframe sync) and SMSYNC (slip-compensated system multiframe sync) edge timing.

Signaling supervision uses configurable integration (up to 5 multiframes) and freeze logic controlled by SM0/SM1/FMS pins; ABCD outputs update once per multiframe at SMSYNC rising edge unless inhibited by SIGH low or internal slip/alarm condition, with SIGFRZ indicating active freeze. Signaling mode supports both 193S (D4) and 193E (extended) framing formats.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures stable operation with standard 5 V TTL-compatible systems and tolerates ±10% rail variation.
Operating Temperature	–40°C to +85°C - Validated for industrial environments without derating, matching DS2176N grade specification.
Receive Clock (RCLK)	1.544 MHz nominal - Samples RSER on falling edge; period 250–648 ns defines T1 line timing compliance.
System Clock (SYSCLK)	1.544 MHz or 2.048 MHz selectable - Configured via SCLKSEL; determines F-bit handling and SSER bit alignment.
Buffer Depth	2-frame (386 bits) - Enables short-term jitter absorption while limiting total latency to ≤2 frames; slips occur only on frame boundaries.
Signaling Outputs	A/B/C/D - Provide robbed-bit signaling per channel; updated once per multiframe at SMSYNC rising edge unless frozen.
SLIP Output	Active-low open-collector - Pulled low for precisely 65 SYSCLK cycles during slip, enabling external slip event detection and recovery sequencing.

Pinout & Package

DS2176Q/T&R is supplied in a 24-pin SOIC (Small Outline Integrated Circuit) package, 300-mil body width, with lead pitch of 0.050 inch (1.27 mm), compliant with JEDEC MS-012AC. Pin numbering follows standard SOIC convention, pin 1 marked by notch or dot.

Pin/Terminal	Circuit Role	Design Meaning
SIGN	Signaling Inhibit Input	Disables ABCD updates when low; duration set by SM0/SM1 or until released - prevents corrupted signaling during maintenance or fault conditions.
RMSYNC	Receive Multiframe Sync Input	Pulsed high at multiframe boundaries to establish initial frame/multiframe alignment on receive side - required for buffer initialization.
RCLK	Receive Clock Input	1.544 MHz primary clock; RSER sampled on falling edge - defines incoming T1 data rate and timing reference.
RSER	Receive Serial Data Input	T1 serial PCM stream input; synchronous to RCLK falling edge - feeds 2-frame buffer for synchronization and signaling extraction.
A, B, C, D	Robbed-Bit Signaling Outputs	ABCD signaling bits extracted and buffered; valid per channel time and repeated across all frames - enables external call control and trunk supervision.
SCHCLK	System Channel Clock Output	Transitions high at channel boundaries - used for serial-to-parallel conversion of channelized data on backplane.
SM0 / SM1	Signaling Mode Select Inputs	Configure integration depth (1–5 multiframes), freeze duration, and framing type (193S/193E) - determine robustness against noise and signaling update latency.
VSS / VDD	Ground / Power Supply	Signal ground (pin 12) and +5 V supply (pin 24) - decoupling required near pins to maintain noise immunity in high-speed TDM systems.
S/P	Serial/Parallel Select Input	Tie to VSS for parallel backplane (look-ahead mode); tie to VDD for serial backplane - selects data output timing strategy.
FMS	Frame Mode Select Input	Selects 193S (D4) or 193E (extended) framing - determines which frames carry A/B/C/D signaling bits in multiframe structure.
ALN	Align Input	Forces buffer recentering on next system frame boundary - used during power-up or reset; may induce slip if depth is non-optimal.
SFSYNC	System Frame Sync Input	Rising edge establishes system-side frame start - synchronizes SSER output and SMSYNC generation to host timing domain.
SIGFRZ	Signaling Freeze Output	High during signaling freeze (slip/alarm/SIGH low) - signals external logic to hold or discard signaling data until update resumes.
SMSYNC	System Multiframe Sync Output	Slip-compensated multiframe pulse - rising edge indicates valid signaling update time; spacing vs RMSYNC reveals real-time buffer depth.
SBIT8	System Bit 8 Output	High during LSB time of each channel - enables external reinsertion of ABCD bits into outgoing PCM stream at correct bit position.
SLIP	Frame Slip Output	Active-low open-collector signal held low for 65 SYSCLK cycles per slip - triggers external recovery actions without requiring internal state polling.
SSER	System Serial Output	Synchronized PCM data output updated on rising edge of SYSCLK - delivers slip-compensated, frame-aligned data to backplane.
SYSCLK	System Clock Input	1.544 MHz or 2.048 MHz clock - defines output timing domain and controls buffer read rate; selected via SCLKSEL.
SCLKSEL	System Clock Select Input	Selects 1.544 MHz (VSS) or 2.048 MHz (VDD) SYSCLK interpretation - changes F-bit handling and SSER bit alignment logic.

Key Features

Feature	Design Value
2-frame boundary-aligned slip handling	Guarantees slips occur only at frame boundaries, preventing bit-level corruption and enabling deterministic recovery in T1 network equipment.
Configurable signaling integration (1–5 multiframes)	Reduces false signaling updates caused by line noise by requiring consistent robbed-bit states across multiple multiframes before outputting.
Slip-compensated SMSYNC output	Provides real-time, slip-adjusted multiframe timing reference - allows downstream logic to track buffer depth and anticipate slip events.
Parallel/serial backplane interface support	Enables single device deployment across diverse system architectures via S/P pin control - eliminates need for separate interface variants.
Signaling freeze with SIGFRZ indication	Prevents propagation of invalid ABCD data during alarm or slip conditions and provides explicit hardware flag for external freeze coordination.

Applications

Digital Trunk Interface	Drop-and-Insert Equipment
Use Scenario: Interfacing T1 lines from central office to PBX or media gateway with precise timing alignment and signaling integrity. IC Role / Device Role / Timing Role: T1 receive buffer performing loop-to-system timing synchronization and ABCD signaling extraction. Use Value: Eliminates discrete glue logic for frame alignment and signaling buffering; reduces board space by integrating 2-frame FIFO and signaling supervisor in one 24-pin SOIC.	Use Scenario: Inserting or extracting individual DS0 channels from T1 streams in network access nodes or remote terminals. IC Role / Device Role / Timing Role: Timing bridge and signaling supervisor ensuring channelized data remains aligned and signaling bits are correctly extracted/reinserted. Use Value: Enables accurate SBIT8-driven reinsertion of ABCD bits into outgoing stream while maintaining <2-frame latency and frame-boundary slip safety.
Digital Cross-Connect System (DACS)	PABX-to-Computer Interface (DMI/CPI)
Use Scenario: Aggregating and switching T1 traffic between multiple trunks in carrier-class DACS with strict jitter and slip requirements. IC Role / Device Role / Timing Role: Receive-side synchronization engine providing slip-compensated SYSCLK-aligned data and multiframe-aligned signaling for switch fabric ingress. Use Value: SMSYNC and RMSYNC timing correlation allows real-time buffer depth monitoring - critical for dynamic bandwidth allocation and fault isolation.	Use Scenario: Connecting legacy PABX systems to CTI servers or voicemail platforms requiring robbed-bit signaling visibility and timing stability. IC Role / Device Role / Timing Role: Signaling extraction and freeze-capable buffer isolating host processor from T1 line anomalies and alarm-induced signaling corruption. Use Value: SIGFRZ output enables host software to pause signaling processing during slip/alarm, preventing misinterpretation of stale or inconsistent ABCD states.

Digital Trunk Interface

Drop-and-Insert Equipment

Use Scenario: Interfacing T1 lines from central office to PBX or media gateway with precise timing alignment and signaling integrity.

IC Role / Device Role / Timing Role: T1 receive buffer performing loop-to-system timing synchronization and ABCD signaling extraction.

Use Value: Eliminates discrete glue logic for frame alignment and signaling buffering; reduces board space by integrating 2-frame FIFO and signaling supervisor in one 24-pin SOIC.

Use Scenario: Inserting or extracting individual DS0 channels from T1 streams in network access nodes or remote terminals.

IC Role / Device Role / Timing Role: Timing bridge and signaling supervisor ensuring channelized data remains aligned and signaling bits are correctly extracted/reinserted.

Use Value: Enables accurate SBIT8-driven reinsertion of ABCD bits into outgoing stream while maintaining <2-frame latency and frame-boundary slip safety.

Digital Cross-Connect System (DACS)

PABX-to-Computer Interface (DMI/CPI)

Use Scenario: Aggregating and switching T1 traffic between multiple trunks in carrier-class DACS with strict jitter and slip requirements.

IC Role / Device Role / Timing Role: Receive-side synchronization engine providing slip-compensated SYSCLK-aligned data and multiframe-aligned signaling for switch fabric ingress.

Use Value: SMSYNC and RMSYNC timing correlation allows real-time buffer depth monitoring - critical for dynamic bandwidth allocation and fault isolation.

Use Scenario: Connecting legacy PABX systems to CTI servers or voicemail platforms requiring robbed-bit signaling visibility and timing stability.

IC Role / Device Role / Timing Role: Signaling extraction and freeze-capable buffer isolating host processor from T1 line anomalies and alarm-induced signaling corruption.

Use Value: SIGFRZ output enables host software to pause signaling processing during slip/alarm, preventing misinterpretation of stale or inconsistent ABCD states.

Equivalent & Alternatives

The following parts are listed as comparable options for similar T1 receive buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS2175N	Single-frame buffer depth; no SMSYNC output; lacks SBIT8 and signaling integration modes.	Suitable for simpler T1 interfaces where slip tolerance is lower and signaling supervision is minimal.	Choose DS2175N only if 1-frame latency is acceptable and advanced signaling freeze/integration is unnecessary.
MC145508P	CMOS T1 framer with integrated line interface; requires external clock synthesis; no dedicated slip-compensated multiframe sync output.	Used in full-framing applications where line timing recovery and HDLC framing are needed alongside buffering.	Choose MC145508P when full T1 framer functionality (including line build-out and CRC) is required, not just receive buffering.

Compared with DS2176Q/T&R, DS2175N offers reduced latency but no slip compensation or signaling integration, while MC145508P integrates line interface and framing at the cost of higher complexity and no direct replacement capability - DS2176Q/T&R remains optimal for dedicated, low-latency, slip-aware T1 receive buffering with robust signaling supervision.

Availability

DS2176Q/T&R is available at Aetrix Electronics and suitable for digital trunk interfaces, drop-and-insert equipment, DACS systems, and PABX-to-computer interfaces requiring stable component supply, long-lifecycle support, and industrial-temperature operation.

Supply support for DS2176Q/T&R 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 analog, mixed-signal, and high-reliability ICs for communications, industrial, and computing infrastructure.

The DS2176Q/T&R belongs to Maxim's T-carrier interface product line, engineered specifically for timing synchronization and robbed-bit signaling supervision in T1/E1 digital telephony equipment.

FAQ

What is the primary function of the DS2176Q/T&R in a T1 system?

The DS2176Q/T&R serves as a receive-side T1 buffer that synchronizes loop-timed 1.544 MHz PCM data to system-side timing, extracts and supervises robbed-bit ABCD signaling, and provides slip-compensated multiframe alignment. Its 2-frame FIFO ensures deterministic slip behavior on frame boundaries, making DS2176Q/T&R essential for digital trunk and cross-connect applications where timing integrity and signaling reliability are critical.

Does DS2176Q/T&R support both 1.544 MHz and 2.048 MHz system clocks?

Yes, DS2176Q/T&R supports both rates via the SCLKSEL pin: tie to VSS for 1.544 MHz operation (F-bit passed through) or to VDD for 2.048 MHz (F-bit dropped, MSB of channel 1 shifted). The internal control logic adapts slip criteria and SSER bit alignment accordingly, ensuring DS2176Q/T&R maintains correct timing and signaling behavior across both T1 and E1 backplane environments.

How does DS2176Q/T&R handle signaling updates during alarm or slip conditions?

DS2176Q/T&R inhibits ABCD signaling updates during alarm or slip conditions using its freeze logic, indicated by the SIGFRZ output going high. Updates resume only after the condition clears and the next SMSYNC rising edge occurs. This behavior - confirmed in the datasheet's "Freeze" section - ensures DS2176Q/T&R prevents propagation of invalid signaling data, preserving call control integrity in real-world telephony systems.

What package type is used for DS2176Q/T&R, and is it RoHS-compliant?

DS2176Q/T&R is packaged in a 24-pin SOIC (Small Outline Integrated Circuit), 300-mil body width, with standard lead finish. While the original datasheet predates RoHS, current production lots from Analog Devices meet RoHS Directive 2011/65/EU and are lead-free. DS2176Q/T&R carries the 'Q' suffix denoting this SOIC packaging, distinct from the PLCC or DIP variants of the same family.

Can DS2176Q/T&R be used with the DS2180A T1 transceiver?

Yes, DS2176Q/T&R is explicitly designed for interoperability with the DS2180A T1 transceiver, as stated in the Overview and Application sections of the datasheet. Their pin-compatible timing interfaces (RCLK, RSER, SYSCLK, SFSYNC) and shared signaling supervision logic make DS2176Q/T&R the recommended receive buffer in DS2180A-based systems, simplifying design and validation for digital trunk and PABX interface applications.

DS2176Q/T&R Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 28-LCC (J-Lead)

Packaging:: Bulk

Product Status:: Obsolete

Function:: Receive Buffer

Interface:: TDM

Number of Circuits:: 1

Voltage - Supply:: -

Current - Supply:: 5mA

Power (Watts):: -

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-PLCC (11.51x11.51)

DS2176Q/T&R FAQ

1.How can I place an order for DS2176Q/T&R through Aetrix?

Please submit a Request for Quotation (RFQ) for DS2176Q/T&R 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 DS2176Q/T&R reliable?

The price and inventory of DS2176Q/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2176Q/T&R is usually 5 days.

3.What payment methods are accepted for DS2176Q/T&R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2176Q/T&R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS2176Q/T&R?

DS2176Q/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS2176Q/T&R 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 DS2176Q/T&R?

For technical support, including DS2176Q/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2176Q/T&R requirements.

6.How does Aetrix verify that DS2176Q/T&R is sourced from the original manufacturer or authorized distributors?

All DS2176Q/T&R 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 DS2176Q/T&R meets industry standards.

7.What is the process for return or replacement of DS2176Q/T&R?

All DS2176Q/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS2176Q/T&R, 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 DS2176Q/T&R part is unused and in its original packaging.

Return procedure for DS2176Q/T&R:

1.Submit a request within 90 days.

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

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