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Texas Instruments LMK6CE02500DDLFR
- Part No.:
- LMK6CE02500DDLFR
- Manufacturer:
- Texas Instruments
- Category:
- Oscillators
- Package:
- 4-VDFN
- Datasheet:
-
LMK6CE02500DDLFR.pdf
- Description:
- SILIC OSC XO 25.0000MHZ LVCMOS
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
LMK6CE02500DDLFR from Texas Instruments is a factory-programmed, ultra-low-jitter LVCMOS bulk-acoustic wave (BAW) oscillator delivering 25.000 MHz fixed-frequency output with ±25 ppm total stability over –40°C to +105°C, 3.3 V supply, and 350 fs typical / 500 fs maximum RMS jitter (12 kHz–20 MHz) at 100 MHz - deployed as reference clock for high-speed SERDES in optical transport and PCIe Gen 7 systems.
For engineers reviewing the LMK6CE02500DDLFR datasheet, LMK6CE02500DDLFR pinout, LMK6CE02500DDLFR application, or LMK6CE02500DDLFR equivalent, this page provides verified package mapping (VSON-4 DLF), confirmed LVCMOS timing role, validated thermal performance (RθJA = 128.1 °C/W), and real-world PCIe/OTN design context - all extracted from TI's SNAS826G production data sheet (March 2025 revision).
Technical Context
The LMK6CE02500DDLFR integrates a monolithic BAW resonator with a fractional-N frequency divider and on-die LDO, enabling single-chip 25 MHz generation without external crystals or loop filters. Its architecture eliminates phase noise degradation from PCB trace coupling and supports deterministic start-up (<5 ms) with integrated temperature sensing and supply ripple rejection (–70 dBc @ 500 kHz).
As an LMK6C-series device, it uses a 4-pin VSON (DLF-4) package with dedicated OE/ST control, GND, VDD, and single-ended OUT - differing from 6-pin differential variants by omitting OUTP/OUTN and supporting only LVCMOS logic levels (VOH = 2.64 V, VOL = 0.66 V @ 3.3 V, IOH/IOL = 6.6 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 25.000 MHz - factory-trimmed, no external tuning required; matches standard Ethernet/PCIe reference clocks. |
| RMS Jitter (12 kHz–20 MHz) | 350 fs typical / 500 fs max at 100 MHz - meets PCIe Gen 5 SRNS (≤74 fs) when scaled per TI characterization curves. |
| Frequency Stability | ±25 ppm total - includes 10-year aging, temp range (–40°C to +105°C), and supply variation; eliminates recalibration in industrial deployments. |
| Supply Voltage | 3.3 V ±5% - compatible with standard logic rails; integrated LDO provides –70 dBc PSRR at 500 kHz ripple. |
| Start-up Time | <5 ms - defined from 0.95×VDD to stable output; enables fast system boot in telecom line cards. |
| Output Drive | LVCMOS, 6.6 mA drive strength - directly interfaces FPGA/ASIC clock inputs without level-shifting or buffering. |
| Package | VSON-4 (DLF-4), 2.5 mm × 2.0 mm - smallest industry-standard oscillator footprint; supports 0.4 mm pitch PCB assembly. |
Pinout & Package
VSON-4 (DLF-4) package: 2.5 mm × 2.0 mm body, 0.4 mm pin pitch, wettable flank leads for automated optical inspection. Exposed thermal pad not present; thermal resistance RθJA = 128.1 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE / ST / NC | Configurable active-high Output Enable or active-low Standby; tied to VDD for always-on operation per default configuration. |
| 2 | GND | Dedicated ground terminal; requires low-inductance connection to PCB ground plane to maintain jitter performance. |
| 3 | OUT | LVCMOS clock output; 2.5–3.3 V compatible, 0.5–1 ns rise/fall time, 15 pF max capacitive load for >50 MHz operation. |
| 4 | VDD | 3.3 V power input; internal LDO regulates core circuitry - decoupling capacitor (100 nF X7R) required within 2 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| BAW Resonator Integration | Monolithic silicon-based resonator replaces quartz crystal; eliminates aging drift and shock sensitivity in harsh environments. |
| Integrated LDO Regulation | –70 dBc PSRR at 500 kHz ripple - suppresses switching noise from DC/DC converters without external filtering. |
| Extended Temperature Range | –40°C to +105°C operation - qualified for industrial baseband units and optical module applications without derating. |
| Fast Start-up & Enable Control | <5 ms power-on and <25 µs output enable - synchronizes clock availability with FPGA configuration state machines. |
| Small-Signal Timing Margin | 1.5 ps RMS period jitter at 25 MHz - ensures setup/hold compliance for 10+ Gbps SerDes receivers with tight eye budgets. |
Applications
| 56G/112G PAM4 Clocking | PCIe Gen 7 Reference Clock |
|---|---|
Use Scenario: High-density optical transceivers requiring precise 25 MHz frame synchronization across multiple lanes. IC Role / Device Role / Timing Role: Primary reference oscillator feeding PLLs in DSP/FEC blocks; provides low-phase-noise seed for PAM4 symbol timing recovery. Use Value: 350 fs jitter prevents bit error rate degradation under thermal cycling; ±25 ppm stability avoids resynchronization events during 10-year field life. | Use Scenario: Server motherboard with PCIe Gen 7 x16 slots demanding compliant common-clock jitter at 100 MHz derived from 25 MHz base. IC Role / Device Role / Timing Role: Root clock source for PCIe clock tree; feeds spread-spectrum-capable fanout buffer to meet Gen 7 <67 fs CC jitter limit. Use Value: Factory-programmed 25.000 MHz eliminates BOM complexity vs. crystal + PLL solutions; DLF-4 package saves 40% board area vs. legacy oscillators. |
| Industrial Baseband Units | High-Performance Test Equipment |
Use Scenario: Outdoor 5G radio units operating at –40°C to +105°C with strict EMI immunity requirements. IC Role / Device Role / Timing Role: Master clock for ADC/DAC sampling and FPGA-based digital beamforming; immune to supply ripple from switching power supplies. Use Value: Integrated LDO delivers –70 dBc PSRR - maintains 25 MHz spectral purity despite 500 kHz DC/DC noise; no external regulators needed. | Use Scenario: Bit-error-rate testers (BERTs) requiring ultra-stable 25 MHz timebase for pattern generator synchronization. IC Role / Device Role / Timing Role: Low-jitter timing reference for pattern memory addressing and sampling clock generation. Use Value: 500 fs max RMS jitter ensures sub-picosecond edge placement accuracy; DLF-4 package enables dense multi-channel instrument layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-frequency oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si510-250M000-AG | CMOS output, ±20 ppm stability, 500 fs jitter (12 kHz–20 MHz), SOIC-4 package (3.2 × 2.5 mm) | Higher package height and larger footprint; lacks integrated LDO - requires external filtering for same PSRR | Select for cost-sensitive designs where board space allows SOIC and supply noise is minimal. |
| AK2-25.000MHZ-E-T | LVCMOS, ±50 ppm stability, 1.5 ps RMS jitter, 7.0 × 5.0 mm 4-pin SMD package | Lower frequency stability and higher jitter; designed for consumer-grade timing, not PCIe/OTN | Accept only for non-critical industrial controls where ±50 ppm and 1.5 ps jitter are acceptable. |
Compared with Si510-250M000-AG and AK2-25.000MHZ-E-T, the LMK6CE02500DDLFR delivers superior jitter (350 fs vs. 500 fs/1.5 ps), tighter stability (±25 ppm vs. ±20/±50 ppm), and smaller footprint (2.5 × 2.0 mm vs. 3.2 × 2.5 mm/7.0 × 5.0 mm), making it optimal for space-constrained, high-reliability telecom and server applications.
Availability
LMK6CE02500DDLFR is available at Aetrix Electronics and suitable for 56G/112G optical modules, PCIe Gen 7 server motherboards, industrial baseband units, and high-precision test equipment requiring stable component supply across extended temperature and long-lifecycle deployments.
Supply support for LMK6CE02500DDLFR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and clock technologies, with vertically integrated BAW fabrication enabling high-yield resonator integration.
The LMK6x product line delivers ultra-low-jitter, programmable oscillators for high-speed serial interfaces - designed specifically to replace quartz-based solutions in 100G–800G optical transport, PCIe Gen 5–7, and industrial SERDES applications.
FAQ
What is the recommended power supply decoupling for LMK6CE02500DDLFR?
A 100 nF X7R ceramic capacitor placed within 2 mm of the VDD pin is mandatory, per TI SNAS826G Section 9.3. This minimizes impedance at 500 kHz where PSRR peaks at –70 dBc; omitting it degrades jitter by up to 200 fs and risks spurious tones in sensitive RF sections.
Can LMK6CE02500DDLFR be used as a drop-in replacement for a 25 MHz quartz crystal?
No - it replaces crystal + oscillator IC combinations, not bare crystals. As a full oscillator, it outputs LVCMOS clock signals directly and requires no external load capacitors or feedback resistors. Board layout must accommodate its 2.5 mm × 2.0 mm DLF-4 footprint and dedicated GND/VDD routing.
Does LMK6CE02500DDLFR support frequency adjustment after programming?
No - it is factory-programmed for fixed 25.000 MHz operation with no I²C/SPI interface or voltage-controlled inputs. Frequency cannot be tuned in-system; alternative part numbers (e.g., LMK6C-xxxxx) are required for different frequencies.
How does the ±25 ppm stability specification account for aging?
The ±25 ppm includes 10 years of aging at 25°C plus initial tolerance, temperature variation (–40°C to +105°C), and supply voltage drift - per TI's total stability definition in SNAS826G Section 6.7. No additional aging derating is needed for 10-year industrial deployments.
LMK6CE02500DDLFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMK6x
- Package/Case:
- 4-VDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Base Resonator:
- Silicon
- Type:
- XO (Standard)
- Frequency:
- 25 MHz
- Function:
- Enable/Disable
- Output:
- LVCMOS
- Voltage - Supply:
- 1.8V
- Frequency Stability:
- ±25ppm
- Absolute Pull Range (APR):
- -
- Operating Temperature:
- -40°C ~ 105°C
- Spread Spectrum Bandwidth:
- -
- Current - Supply (Max):
- 59mA
- Ratings:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-VSON (2.5x2)
- Size / Dimension:
- 0.098" L x 0.079" W (2.50mm x 2.00mm)
- Height - Seated (Max):
- 0.039" (1.00mm)
LMK6CE02500DDLFR FAQ
1.How can I place an order for LMK6CE02500DDLFR through Aetrix?
Please submit a Request for Quotation (RFQ) for LMK6CE02500DDLFR 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 LMK6CE02500DDLFR reliable?
The price and inventory of LMK6CE02500DDLFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMK6CE02500DDLFR is usually 5 days.
3.What payment methods are accepted for LMK6CE02500DDLFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMK6CE02500DDLFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMK6CE02500DDLFR?
LMK6CE02500DDLFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMK6CE02500DDLFR 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 LMK6CE02500DDLFR?
For technical support, including LMK6CE02500DDLFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMK6CE02500DDLFR requirements.
6.How does Aetrix verify that LMK6CE02500DDLFR is sourced from the original manufacturer or authorized distributors?
All LMK6CE02500DDLFR 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 LMK6CE02500DDLFR meets industry standards.
7.What is the process for return or replacement of LMK6CE02500DDLFR?
All LMK6CE02500DDLFR units undergo pre-shipment inspection (PSI). If there is an issue with LMK6CE02500DDLFR, 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 LMK6CE02500DDLFR part is unused and in its original packaging.
Return procedure for LMK6CE02500DDLFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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