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Analog Devices Inc./Maxim Integrated DS21602SN
- Part No.:
- DS21602SN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DS21602SN.pdf
- Description:
- IC CLOCK RATE ADAPTER 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,781
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Product details
Overview
DS21602SN from Maxim Integrated is a 3.3V/5V clock rate adapter IC that converts between T-carrier (1.544MHz) and E-carrier (2.048MHz) clock rates, provides two synchronized clock outputs (CLKOUT1 and CLKOUT2), delivers an 8kHz frame-sync output, and operates across -40°C to +85°C for telecom timing applications.
For engineers reviewing the DS21602SN datasheet, DS21602SN pinout, DS21602SN application, or DS21602SN equivalent, key selection criteria include its dual-output frequency locking, phase alignment capability with SYNCIN, low-jitter performance per G.823/TR62411, industrial temperature rating, and drop-in compatibility with LXP602SE in 16-pin SO packaging.
Technical Context
The DS21602SN implements a PLL-based analog clock synthesis architecture with feedback divider and frame-sync generator, enabling precise frequency conversion between 1.544MHz and 2.048MHz while maintaining phase coherence across CLKOUT1, CLKOUT2, and SYNCOUT when SYNCIN is asserted.
It supports two fixed conversion modes via SEL pin: high-to-low (2.048MHz → 1.544MHz @ CLKOUT1, 6.176MHz @ CLKOUT2) and low-to-high (1.544MHz → 2.048MHz @ CLKOUT1, 8.192MHz @ CLKOUT2), both delivering an 8kHz frequency-locked SYNCOUT without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V or 5V ±5% - enables direct integration into legacy 5V and modern 3.3V telecom line cards |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade deployment in base station and access node environments |
| CLKOUT1 Jitter | 0.012–0.025 UIP-P (G.823 band) - meets ITU-T jitter compliance for T1/E1 interface timing recovery |
| Input Capture Range | ±10,000 ppm - tolerates significant clock drift from upstream sources without loss of lock |
| CLKOUT1 Delay | -15 ns to +22 ns (5V), -15 ns to +41 ns (3.3V) - deterministic latency critical for frame-aligned signal processing |
| SYNCOUT Duty Cycle | 50% - ensures reliable edge-triggered frame synchronization in TDM systems |
Pinout & Package
DS21602SN is housed in a 16-pin SO (Small Outline) package, pin-compatible with LXP602SE and optimized for surface-mount assembly in space-constrained telecom modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNCOUT (Pin 1) | Synchronization Output | Provides 8kHz frame-sync pulse locked to CLKIN; used for TDM slot alignment and system-level timing coordination |
| CLKOUT2 (Pin 4) | High-Multiple Clock Output | Delivers 6.176MHz (SEL=1) or 8.192MHz (SEL=0); serves as bit-clock source for E1/T1 framer or serializer |
| CLKIN (Pin 3) | Reference Clock Input | Accepts 1.544MHz or 2.048MHz input; determines all output frequencies and jitter transfer characteristics |
| CLKOUT1 (Pin 7) | Primary Carrier Clock Output | Outputs converted T1 (1.544MHz) or E1 (2.048MHz) clock; directly drives line interface units (LIUs) |
| SEL (Pin 6) | Mode Select Input | Digital control pin selecting conversion direction: logic 0 = 1.544MHz→2.048MHz; logic 1 = 2.048MHz→1.544MHz |
| SYNCIN (Pin 14) | Frame-Sync Input | Enables phase alignment of all outputs to external 1–8kHz sync signal; locks within ≤50ms at 8kHz |
| VDD (Pin 16) | Positive Supply | Supports 3.3V or 5V operation; decoupling required per layout guidelines to maintain jitter performance |
| VSS (Pin 9) | Ground | Common return path for analog and digital sections; separation from noisy digital ground recommended |
Key Features
| Feature | Design Value |
|---|---|
| Direct Drop-In Replacement | Fully pin- and function-compatible with LXP602SE, enabling seamless migration without PCB redesign |
| Bidirectional Clock Conversion | Supports both T1→E1 and E1→T1 rate translation using single SEL-controlled mode, reducing BOM count |
| No External Components | Integrates PLL, dividers, and frame-sync generator on-die - eliminates external crystals, capacitors, or resistors |
| Low-Jitter Output Compliance | Meets G.823 and TR62411 jitter limits across defined bands, ensuring interoperability with ITU-T-compliant equipment |
| Phase Alignment Capability | Allows CLKOUT1, CLKOUT2, and SYNCOUT to be precisely aligned to SYNCIN, critical for multi-channel TDM synchronization |
Applications
| DSLAM Line Card Timing | T1/E1 Framer Interface |
|---|---|
Use Scenario: Synchronizing multiple T1/E1 ports in a DSLAM line card where upstream clocks vary between 1.544MHz and 2.048MHz. IC Role / Device Role / Timing Role: Clock rate adapter providing frequency-locked and phase-aligned CLKOUT1 and CLKOUT2 to drive framer ASICs and LIUs. Use Value: Eliminates need for separate clock synthesizers per port, reduces board area by 35%, and maintains <0.025 UIP-P jitter for error-free data recovery. | Use Scenario: Interfacing a T1 framer ASIC requiring 1.544MHz clock with an E1 backplane operating at 2.048MHz. IC Role / Device Role / Timing Role: Bidirectional clock translator generating 1.544MHz CLKOUT1 from 2.048MHz CLKIN while preserving frame-sync integrity. Use Value: Enables mixed T1/E1 infrastructure without clock domain crossing logic, reducing ASIC complexity and power by 22%. |
| Base Station Synchronization | Legacy PBX Upgrade Module |
Use Scenario: Adding E1 support to a T1-based cellular base station controller where frame alignment to network master clock is mandatory. IC Role / Device Role / Timing Role: Frame-sync generator and clock converter producing phase-aligned 8kHz SYNCOUT and 2.048MHz CLKOUT1 from 1.544MHz CLKIN. Use Value: Achieves sub-50ms sync acquisition and <±15ns CLKOUT1 delay variation, meeting 3GPP TS 25.104 timing stability requirements. | Use Scenario: Retrofitting a legacy PBX with E1 trunk interfaces while retaining existing T1 timing infrastructure. IC Role / Device Role / Timing Role: Drop-in replacement for LXP602SE, converting 1.544MHz system clock to 2.048MHz E1 line clock with identical pinout and timing behavior. Use Value: Enables field upgrade without hardware revision, leveraging existing PCB layout and firmware control logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock rate adapter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LXP602SE | Same pinout, identical AC/DC specs, but higher typical jitter gain (1.1 vs. 1.6) peaking at 20–40kHz vs. 4–8kHz | Validated in older telecom designs; lacks explicit 3.3V support in original spec | Select LXP602SE only for legacy rework where DS21602SN qualification is pending |
| DS21602SN+ | Lead(Pb)-free/RoHS-compliant version of DS21602SN; identical electrical and thermal performance | Required for new designs targeting EU/China RoHS compliance; same footprint and thermal profile | Prefer DS21602SN+ for all new production; DS21602SN remains viable for non-RoHS markets |
Compared with LXP602SE and DS21602SN+, the DS21602SN offers tighter jitter control in the 4–8kHz band critical for E1/T1 frame alignment, full 3.3V/5V dual-supply support out-of-box, and guaranteed phase-lock acquisition within 50ms - making it optimal for new telecom infrastructure deployments requiring regulatory compliance and low-latency sync.
Availability
DS21602SN is available at Aetrix Electronics and suitable for DSLAM line cards, T1/E1 framer interfaces, base station synchronization modules, and legacy PBX upgrade programs requiring stable component supply and long-term lifecycle assurance.
Supply support for DS21602SN 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The DS21602SN belongs to Maxim's telecom timing product line, designed specifically to replace legacy clock adapters in T1/E1 infrastructure while supporting dual-voltage operation, low-jitter synthesis, and frame-sync alignment for carrier-grade reliability.
FAQ
What clock frequencies does the DS21602SN support for conversion?
The DS21602SN supports bidirectional conversion between 1.544MHz (T1) and 2.048MHz (E1) reference clocks. When CLKIN = 1.544MHz and SEL = 0, CLKOUT1 = 2.048MHz and CLKOUT2 = 8.192MHz; when CLKIN = 2.048MHz and SEL = 1, CLKOUT1 = 1.544MHz and CLKOUT2 = 6.176MHz. An 8kHz SYNCOUT is always active and frequency-locked to CLKIN.
Is the DS21602SN pin-compatible with the LXP602SE?
Yes, the DS21602SN is a direct drop-in replacement for the LXP602SE. Both devices use the same 16-pin SO package, identical pin functions (e.g., CLKIN, CLKOUT1, SYNCIN), and matching DC/AC specifications. The DS21602SN retains full functional equivalence while adding explicit 3.3V support and improved jitter performance in the 4–8kHz band.
How does the DS21602SN achieve phase alignment between clock outputs and SYNCIN?
The DS21602SN uses an internal frame-sync generator that locks CLKOUT1, CLKOUT2, and SYNCOUT to the rising edge of SYNCIN when asserted. Phase alignment occurs within ≤50ms for an 8kHz SYNCIN signal, and the device accepts integer subrates (1kHz, 2kHz, 4kHz) as well. This ensures deterministic timing relationships essential for TDM multiplexing and channel bonding.
What is the maximum jitter specification for DS21602SN CLKOUT1 output?
The DS21602SN CLKOUT1 output exhibits a maximum jitter of 0.025 UIP-P in the G.823 band (20Hz–100kHz) and 0.012 UIP-P typical under 2.048MHz-to-1.544MHz conversion (SEL = 1). These values meet ITU-T G.823 and TR62411 standards, ensuring compatibility with carrier-class T1/E1 line interface units and framers.
Does the DS21602SN require external passive components for operation?
No, the DS21602SN requires no external passive components. Its integrated analog PLL, feedback dividers, and frame-sync generator eliminate the need for external crystals, loop filters, or timing resistors. Only standard VDD/VSS decoupling capacitors (per Maxim's layout guidelines) are needed to maintain specified jitter performance and supply stability.
DS21602SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Clock Rate Adapter
- PLL:
- Yes
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:2
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 8.192MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3.135V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SOIC
DS21602SN FAQ
1.How can I place an order for DS21602SN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21602SN 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 DS21602SN reliable?
The price and inventory of DS21602SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21602SN is usually 5 days.
3.What payment methods are accepted for DS21602SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21602SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21602SN?
DS21602SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21602SN 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 DS21602SN?
For technical support, including DS21602SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21602SN requirements.
6.How does Aetrix verify that DS21602SN is sourced from the original manufacturer or authorized distributors?
All DS21602SN 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 DS21602SN meets industry standards.
7.What is the process for return or replacement of DS21602SN?
All DS21602SN units undergo pre-shipment inspection (PSI). If there is an issue with DS21602SN, 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 DS21602SN part is unused and in its original packaging.
Return procedure for DS21602SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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