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Analog Devices Inc./Maxim Integrated DS21600N
- Part No.:
- DS21600N
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
DS21600N.pdf
- Description:
- IC CLOCK RATE ADAPTER 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,189
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Product details
Overview
DS21600N from Maxim Integrated is a 3.3V/5V clock rate adapter IC designed for E-carrier/T-carrier interworking in telecom timing systems. It converts between 1.544MHz and 2.048MHz reference clocks, delivers two synchronized outputs (CLKOUT1 and CLKOUT2), and provides an 8kHz frame-sync output - all frequency-locked to CLKIN. Used in TDM multiplexers and line interface units requiring precise carrier clock translation.
For engineers reviewing the DS21600N datasheet, DS21600N pinout, DS21600N application, or DS21600N equivalent, key selection criteria include its dual-rate conversion capability (T1↔E1), industrial temperature rating (–40°C to +85°C), 8-pin DIP package compatibility with legacy LXP600A designs, and low-jitter performance meeting G.823 and TR62411 specifications.
Technical Context
The DS21600N implements a PLL-based analog clock synthesis architecture with integrated frame-sync generator and feedback divider. Its SEL pin selects between high-to-low (2.048MHz → 1.544MHz) and low-to-high (1.544MHz → 2.048MHz) conversion modes, each producing distinct CLKOUT2 frequencies (6.176MHz or 6.144MHz).
All outputs - CLKOUT1, CLKOUT2, and SYNCOUT - are phase-aligned to CLKIN when SYNCIN is asserted; synchronization completes within 50ms for 8kHz SYNCIN. Jitter transfer peaks at ~1.6 ns/ns in the 4kHz–8kHz band, differing from legacy LXP60x devices whose peak occurs at 20kHz–40kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V or 5V ±5% - supports dual-rail legacy and modern telecom systems without level-shifting. |
| Input Clock Range | 1.544MHz or 2.048MHz - matches standard T1/E1 primary reference clocks. |
| CLKOUT1 Frequency | 1.544MHz or 2.048MHz - selectable via SEL pin; always matches opposite carrier standard of CLKIN. |
| CLKOUT2 Frequency | 6.144MHz (SEL=0) or 6.176MHz (SEL=1) - provides higher-rate clock for framing or oversampling. |
| SYNCOUT Frequency | 8kHz - fixed, frequency-locked to CLKIN; used for frame alignment in TDM systems. |
| Jitter Performance | 0.018 UIP-P (typ), 0.035 UIP-P (max), 20Hz–100kHz band - meets ITU-T G.823 jitter mask for network element clocks. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade telecom equipment deployment. |
Pinout & Package
DS21600N is housed in an 8-pin plastic dual in-line package (PDIP), pin-compatible with legacy LXP600A and suitable for through-hole prototyping and industrial backplane applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SYNCOUT | 8kHz frame-synchronization output, phase-aligned to CLKIN and SYNCIN; used for TDM slot boundary alignment. |
| 2 | CLKOUT2 | Higher multiple-rate clock output (6.144MHz or 6.176MHz); supports framing logic or oversampled data paths. |
| 3 | CLKIN | Primary reference clock input (1.544MHz or 2.048MHz); determines all output frequencies and jitter transfer behavior. |
| 4 | CLKOUT1 | T1/E1 carrier clock output (1.544MHz or 2.048MHz); inverted polarity of CLKIN frequency per SEL setting. |
| 5 | Vss | Digital ground reference; must be decoupled near VDD pin to minimize supply noise coupling into PLL. |
| 6 | SEL | Mode-select control input; logic high selects 2.048MHz→1.544MHz conversion, logic low selects reverse. |
| 7 | SYNCIN | Frame-sync input (8kHz or integer subrate); enables phase-locking of all outputs; tie high/low if unused. |
| 8 | VDD | Positive supply (3.3V or 5V); requires local 0.1µF ceramic decoupling capacitor for stable PLL operation. |
Key Features
| Feature | Design Value |
|---|---|
| Direct drop-in replacement for LXP600A | Pin- and function-compatible with LXP600A/LXP600ASE; enables upgrade without PCB redesign. |
| No external components required | Integrated PLL, dividers, and sync generator eliminate need for external crystals, capacitors, or resistors. |
| Phase-aligned multi-output clocking | CLKOUT1, CLKOUT2, and SYNCOUT maintain deterministic phase relationships under SYNCIN control. |
| Low-jitter conversion across standards | Meets G.823 and TR62411 jitter masks for both T1→E1 and E1→T1 conversions. |
| Industrial temperature operation | Validated performance over –40°C to +85°C ensures reliability in uncontrolled telecom cabinet environments. |
Applications
| Telecom Line Interface Unit (LIU) | TDM Multiplexer Timing Module |
|---|---|
|
Use Scenario: Interfacing E1 and T1 trunk lines in access concentrators where mixed-carrier aggregation is required. IC Role / Device Role / Timing Role: Clock rate adapter translating 2.048MHz E1 framing clock to 1.544MHz T1 line clock (or vice versa) while preserving frame-sync integrity. Use Value: Enables single hardware platform to support both E-carrier and T-carrier service provisioning without clock domain isolation circuitry. |
Use Scenario: Providing synchronized clocks to multiple TDM switch fabric interfaces operating on different carrier standards. IC Role / Device Role / Timing Role: Dual-output clock generator delivering CLKOUT1 (1.544MHz) for T1 PHYs and CLKOUT2 (6.176MHz) for internal framing logic. Use Value: Eliminates need for separate clock synthesizers and reduces board-level jitter accumulation by deriving all clocks from one reference. |
| Legacy Network Element Upgrade | Industrial Protocol Converter Gateway |
|
Use Scenario: Replacing obsolete LXP600A in deployed central office equipment requiring RoHS-compliant, 3.3V-capable timing ICs. IC Role / Device Role / Timing Role: Pin-compatible clock adapter maintaining identical timing behavior and thermal profile as original design. Use Value: Extends product lifecycle without requalification of timing subsystems or changes to mechanical layout. |
Use Scenario: Bridging legacy T1-based SCADA telemetry with modern E1-based backbone networks in utility substations. IC Role / Device Role / Timing Role: Carrier clock translator ensuring deterministic phase alignment between upstream/downstream frame boundaries via SYNCIN/SYNCOUT. Use Value: Prevents bit slips and frame loss during cross-standard data transport by locking all clocks to a common 8kHz reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock rate adaptation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LXP600A | 5V-only supply; no 3.3V operation; higher jitter gain peaking at 20kHz–40kHz vs. DS21600N's 4kHz–8kHz peak. | Legacy part with identical pinout but not RoHS-compliant; lacks 3.3V support and updated jitter specs. | Select DS21600N for new designs requiring dual-voltage operation, lower jitter in critical bands, and lead-free compliance. |
| DS21600SN | Same core functionality and electrical specs, but in 16-pin SO package instead of 8-pin DIP; different thermal and layout characteristics. | Surface-mount variant optimized for high-density PCBs; incompatible with through-hole sockets used for DS21600N. | Choose DS21600SN only when SMT assembly and space constraints override through-hole serviceability requirements. |
Compared with LXP600A and DS21600SN, the DS21600N uniquely combines 8-pin DIP packaging, 3.3V/5V flexibility, and improved jitter transfer in the 4kHz–8kHz band - making it the optimal choice for upgrading legacy LIUs and field-deployable telecom gateways where socket replacement and thermal robustness are priorities.
Availability
DS21600N is available at Aetrix Electronics and suitable for telecom infrastructure upgrades, TDM multiplexer timing modules, and industrial protocol converter gateways requiring stable component supply across extended product lifecycles.
Supply support for DS21600N 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 industrial, communications, and computing applications.
The DS21600N belongs to Maxim's telecom timing adapter product line, engineered specifically for carrier-grade clock translation in E1/T1 infrastructure where phase coherence, jitter compliance, and drop-in legacy replacement are mandatory.
FAQ
What clock conversion modes does the DS21600N support?
The DS21600N supports bidirectional E-carrier/T-carrier clock rate conversion: SEL = 0 configures 1.544MHz CLKIN → 2.048MHz CLKOUT1 (6.144MHz CLKOUT2); SEL = 1 configures 2.048MHz CLKIN → 1.544MHz CLKOUT1 (6.176MHz CLKOUT2). Both modes deliver an 8kHz SYNCOUT locked to CLKIN.
Is the DS21600N pin-compatible with the LXP600A?
Yes, the DS21600N is a direct drop-in replacement for the LXP600A in 8-pin DIP packaging. Pin functions, ordering nomenclature, and electrical behavior match exactly - enabling seamless upgrade of legacy designs without PCB modification or firmware changes.
Does the DS21600N require external passive components for operation?
No, the DS21600N operates autonomously with no external crystals, capacitors, or resistors. Its integrated PLL, dividers, and frame-sync generator eliminate external timing components - reducing BOM count, board area, and potential jitter sources in telecom timing paths.
What is the maximum allowable jitter on the DS21600N CLKIN input?
The DS21600N accepts CLKIN with ±10,000 ppm capture and lock range. Its jitter transfer function attenuates input jitter above ~10kHz but amplifies it near 4kHz–8kHz (peak gain ~1.6 ns/ns); therefore, input jitter should comply with G.823 mask limits to ensure output jitter remains within spec.
Can the DS21600N generate frame-sync signals for both T1 and E1 systems simultaneously?
Yes - the DS21600N provides a dedicated 8kHz SYNCOUT that remains active and frequency-locked to CLKIN in all modes. When SYNCIN is asserted, this output phase-aligns with CLKOUT1 and CLKOUT2, supporting simultaneous T1 and E1 frame boundary synchronization in hybrid systems.
DS21600N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 6.176MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3.135V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-PDIP
DS21600N FAQ
1.How can I place an order for DS21600N through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21600N 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 DS21600N reliable?
The price and inventory of DS21600N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21600N is usually 5 days.
3.What payment methods are accepted for DS21600N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21600N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21600N?
DS21600N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21600N 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 DS21600N?
For technical support, including DS21600N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21600N requirements.
6.How does Aetrix verify that DS21600N is sourced from the original manufacturer or authorized distributors?
All DS21600N 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 DS21600N meets industry standards.
7.What is the process for return or replacement of DS21600N?
All DS21600N units undergo pre-shipment inspection (PSI). If there is an issue with DS21600N, 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 DS21600N part is unused and in its original packaging.
Return procedure for DS21600N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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