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Analog Devices Inc./Maxim Integrated DS2175SN/T&R
- Part No.:
- DS2175SN/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DS2175SN/T&R.pdf
- Description:
- IC TELECOM INTERFACE 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
DS2175SN/T&R from Maxim Integrated (now Analog Devices) is a low-power CMOS elastic-store memory IC designed for T1/CEPT rate buffering and frame-synchronous data stream alignment between asynchronous telecom networks. It supports 1.544 MHz (T1) and 2.048 MHz (CEPT) clock domains, features a 2-frame buffer depth, slip detection on frame boundaries, and operates across industrial temperature range (–40°C to +85°C). It enables interoperability in digital cross-connects and PABX-to-computer interfaces.
For engineers reviewing the DS2175SN/T&R datasheet, DS2175SN/T&R pinout, DS2175SN/T&R application, or DS2175SN/T&R equivalent, key selection criteria include frame-aligned slip control logic, dual-rate clock select (RCLKSEL/SCLKSEL), open-collector SLIP reporting, real-time buffer depth monitoring via SMSYNC/RMSYNC timing, and compatibility with DS2180A/DS2181A transceivers in telecom timing infrastructure.
Technical Context
The DS2175SN/T&R implements an elastic store using dual-rate, frame-aligned buffering with independent receive (RCLK) and system (SYSCLK) clock domains. Its 2-frame buffer depth-48 bytes for mixed-rate modes, 64 bytes for 2.048 MHz ↔ 2.048 MHz-enables jitter tolerance without long latency (≤250 µs full depth).
Slip correction is deterministic: slips occur only on frame boundaries, are reported via active-low SLIP (65 SYSCLK cycles) and FSD (direction indicator), and support real-time buffer depth monitoring via RMSYNC–SMSYNC edge spacing. ALN input allows synchronous recentering at next system frame boundary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0 V ±10% - powers all logic and I/O; requires stable 4.5–5.5 V rail |
| Operating Temperature | –40°C to +85°C - qualified for industrial telecom equipment environments |
| Buffer Depth | 2 frames - provides deterministic slip handling with ≤250 µs max latency |
| Supported Clock Rates | 1.544 MHz (T1) and 2.048 MHz (CEPT) - selectable per side via RCLKSEL/SCLKSEL |
| SLIP Pulse Width | 65 SYSCLK cycles - ensures reliable detection by external logic or microcontroller |
| Input/Output Timing | tPVD = 75 ns (SYSCLK → SSER) - enables tight timing closure in high-speed backplane designs |
| Power Consumption | 9–16 mA IDD - low quiescent current suitable for multi-channel line cards |
Pinout & Package
DS2175SN/T&R is housed in a 16-pin SOIC (300 mil) package, RoHS-compliant and tape-and-reel packaged (T&R) for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RCLKSEL | Receive Clock Select Input | Configures RCLK rate: VSS = 1.544 MHz, VDD = 2.048 MHz |
| RCLK | Receive Data Clock Input | Drives sampling of RSER on falling edge; sets incoming frame timing |
| RSER | Receive Serial Data Input | PCM data sampled on RCLK falling edge; supports T1/CEPT framed format |
| RMSYNC | Receive Multiframe Sync Input | Rising edge defines receive-side frame/multiframe boundaries |
| FSD | Frame Slip Direction Output | Indicates last slip direction: low = buffer empty (repeat), high = buffer full (delete) |
| SLIP | Frame Slip Indicator Output | Active-low open-collector pulse (65 SYSCLK cycles) signals slip occurrence |
| ALN | Align Control Input | Negative-edge-triggered; recenters buffer at next SFSYNC rising edge |
| VSS | Signal Ground | Reference for all digital and analog circuitry; must be low-impedance |
| SCLKSEL | System Clock Select Input | Configures SYSCLK rate: VSS = 1.544 MHz, VDD = 2.048 MHz |
| S/P | Serial/Parallel Select Input | VSS = parallel backplane mode; VDD = serial backplane mode |
| SCHCLK | System Channel Clock Output | Transitions high at channel boundaries; aids serial-to-parallel conversion |
| SFSYNC | System Frame Sync Input | Rising edge defines system-side frame boundaries; triggers ALN action |
| SMSYNC | System Multiframe Sync Output | Slip-compensated multiframe sync; edge spacing vs RMSYNC indicates real-time buffer depth |
| SSER | System Serial Data Output | Updated on rising edge of SYSCLK; carries aligned PCM data to backplane |
| SYSCLK | System Data Clock Input | Drives output timing and internal state machines; 1.544/2.048 MHz |
| VDD | Positive Supply | +5.0 V power rail; bypassing required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Frame-Boundary Slip Control | Slips occur exclusively on frame boundaries-ensures no bit-level corruption during resynchronization |
| Real-Time Buffer Depth Monitoring | RMSYNC–SMSYNC edge spacing gives direct, cycle-accurate visibility into store occupancy without polling |
| Dual-Rate Clock Select Logic | Independent RCLKSEL and SCLKSEL inputs enable flexible T1↔CEPT, CEPT↔T1, or same-rate bridging |
| Open-Collector SLIP Reporting | SLIP output drives standard TTL/CMOS logic or microcontroller interrupt lines without level-shifting |
| ALN-Controlled Buffer Recentering | Hardware-aligned recentering on next SFSYNC edge eliminates software intervention during initialization or recovery |
Applications
| Digital Cross-Connect Systems (DACS) | PABX-to-Computer Interface (DMI/CPI) |
|---|---|
Use Scenario: Interfacing legacy T1 trunk lines with CEPT-based switching fabric in carrier-grade DACS. IC Role / Device Role / Timing Role: Elastic store synchronizer aligning 1.544 MHz T1 data streams to 2.048 MHz system backplane clocks. Use Value: Eliminates external glue logic for slip management while maintaining frame integrity across rate boundaries. | Use Scenario: Bridging proprietary PABX signaling (T1) to host computer systems operating on CEPT timing. IC Role / Device Role / Timing Role: Rate-adaptive buffer ensuring deterministic latency and frame-aligned data delivery to host interface logic. Use Value: Enables drop-and-insert functionality without frame misalignment or bit loss during clock domain crossing. |
| Digital Trunk Equipment | Drop-and-Insert Multiplexers |
Use Scenario: Aggregating multiple T1 feeds into a CEPT-based transport layer in central office digital trunks. IC Role / Device Role / Timing Role: Synchronizing loop-timed T1 inputs to system-timed CEPT backplane using frame-boundary slip control. Use Value: Provides <250 µs total delay and guaranteed slip reporting-critical for voice-grade jitter compliance. | Use Scenario: Extracting and inserting individual DS0 channels across T1/CEPT rate boundaries in channelized muxes. IC Role / Device Role / Timing Role: Elastic buffer enabling precise channel alignment and F-bit/E-bit handling per standard framing rules. Use Value: Maintains channel identity and framing integrity during rate translation, supporting standards-compliant DMI/CPI protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar elastic store synchronization applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2175N | Same die, DIP package (300 mil); identical electrical specs and timing | Through-hole assembly; no tape-and-reel; less suitable for high-density SMT production | Select DS2175N only for prototyping or legacy through-hole board reuse |
| DS2185 | Enhanced version with extended temperature range (–40°C to +85°C), improved AC specs, and added diagnostic registers | Supports higher reliability requirements in outdoor telecom cabinets and extended-life deployments | Choose DS2185 when lifecycle assurance, diagnostics, or wider temp margin are mandatory |
Compared with DS2175SN/T&R, DS2175N offers identical functionality in DIP packaging but lacks SMT scalability, while DS2185 adds diagnostics and robustness at higher cost-making DS2175SN/T&R optimal for cost-sensitive, high-volume SMT telecom line cards requiring proven T1/CEPT bridging.
Availability
DS2175SN/T&R is available at Aetrix Electronics and suitable for digital cross-connect systems, PABX-to-computer interfaces, and drop-and-insert multiplexers requiring stable component supply, consistent lead times, and long-term manufacturing continuity.
Supply support for DS2175SN/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
Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and timing ICs for communications, industrial, and automotive markets.
The DS2175SN/T&R belongs to Maxim's legacy telecom timing portfolio, engineered specifically for T1/CEPT elastic store synchronization in digital trunking, DACS, and PABX interface equipment.
FAQ
What is the primary function of the DS2175SN/T&R in telecom systems?
The DS2175SN/T&R serves as a frame-synchronous elastic store memory that bridges asynchronous T1 (1.544 MHz) and CEPT (2.048 MHz) data streams. It aligns incoming PCM data to the system backplane clock using a 2-frame buffer, ensuring deterministic slip handling on frame boundaries. The DS2175SN/T&R is essential for maintaining timing integrity in digital cross-connects, PABX interfaces, and trunk equipment where rate translation is required without bit corruption.
How does the DS2175SN/T&R handle clock domain mismatches between T1 and CEPT rates?
The DS2175SN/T&R handles clock domain mismatches using independent RCLKSEL and SCLKSEL inputs to configure each side for 1.544 MHz or 2.048 MHz operation. Its 2-frame buffer absorbs short-term jitter, and slips-triggered only on frame boundaries-recenter the buffer deterministically. The DS2175SN/T&R reports slip events via SLIP and FSD outputs, enabling external logic to monitor and manage synchronization status in real time without software overhead.
What is the significance of the ALN pin on the DS2175SN/T&R?
The ALN (Align) pin on the DS2175SN/T&R is a negative-edge-triggered control input that forces immediate buffer recentering at the next system-side frame boundary defined by SFSYNC. This hardware-assisted alignment eliminates the need for firmware intervention during power-up or recovery sequences. When asserted, ALN ensures the DS2175SN/T&R resumes operation with one-frame buffer depth-critical for predictable latency and deterministic behavior in telecom line cards.
Can the DS2175SN/T&R operate in both serial and parallel backplane configurations?
Yes, the DS2175SN/T&R supports both serial and parallel backplanes via the S/P pin: tied low for parallel mode (requiring external HC595 shift register for parallelization), tied high for serial mode. In parallel mode, it uses look-ahead circuitry to present data 8 clocks early, optimizing timing margins. The DS2175SN/T&R maintains identical frame alignment, slip control, and buffer monitoring functionality regardless of backplane topology-making it adaptable to diverse telecom hardware architectures.
What are the absolute maximum ratings and recommended operating conditions for the DS2175SN/T&R?
The DS2175SN/T&R has an absolute maximum supply voltage of –1.0 V to +7.0 V and storage temperature range of –55°C to +125°C. Its recommended DC operating conditions specify VDD = 4.5–5.5 V at 0°C to +70°C ambient, with VIH ≥ 2.0 V and VIL ≤ +0.8 V. For industrial use, the DS2175SN/T&R is rated –40°C to +85°C, and its 9–16 mA supply current (IDD) reflects typical loading under 2.048 MHz operation with outputs open.
DS2175SN/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Elastic Store
- Interface:
- PCM
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 9mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS2175SN/T&R FAQ
1.How can I place an order for DS2175SN/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2175SN/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 DS2175SN/T&R reliable?
The price and inventory of DS2175SN/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 DS2175SN/T&R is usually 5 days.
3.What payment methods are accepted for DS2175SN/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2175SN/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2175SN/T&R?
DS2175SN/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2175SN/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 DS2175SN/T&R?
For technical support, including DS2175SN/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2175SN/T&R requirements.
6.How does Aetrix verify that DS2175SN/T&R is sourced from the original manufacturer or authorized distributors?
All DS2175SN/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 DS2175SN/T&R meets industry standards.
7.What is the process for return or replacement of DS2175SN/T&R?
All DS2175SN/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS2175SN/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 DS2175SN/T&R part is unused and in its original packaging.
Return procedure for DS2175SN/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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