LMK04000BISQX/NOPB Texas Instruments Integrated Circuit (Quad Flat No-Lead) In Stock
The LMK04000BISQX/NOPB is a high-performance PLL-based clock driver IC from Texas Instruments featuring differential input multiplexing and multiple low-jitter clock outputs. It targets precision clock distribution in communications and instrumentation systems and is housed in a 48-pin QFN package.
- Manufacturer
- Texas Instruments
- Package
- Quad Flat No-Lead
- Pin Count
- 48
- Lifecycle
- ACTIVE
- Datasheet
- LMK04000BISQX/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $11.8700(MOQ 500)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- PLL-based clock driver with differential input MUX for hitless reference switching in redundant clock trees
- 48-pin QFN (S-XQCC-N48) package with exposed pad enables compact, low-inductance clock distribution boards
- Low load capacitance of 10 pF per output minimizes signal degradation on high-frequency clock lines
- Supports the LMK 4000/14000/40000 family architecture for scalable multi-output clock generation designs
- JESD-609 e3 RoHS-compliant lead-free construction meets modern environmental and reliability standards
Applications
The LMK04000BISQX/NOPB is targeted at high-speed communications infrastructure, FPGA-based signal processing boards, and precision test and measurement equipment requiring synchronized, low-jitter clock distribution across multiple receivers. The differential input multiplexer enables automatic or manual switchover between primary and backup reference clocks, making it essential for carrier-grade telecom line cards and data-center switching ASICs. Its 48-pin QFN footprint and multiple output clock format compatibility simplify board integration in dense PCB environments where clock tree fan-out and trace-length matching are critical.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Family | 4000/14000/40000 |
| Input Conditioning | DIFFERENTIAL MUX |
| JESD-30 Code | S-XQCC-N48 |
| JESD-609 Code | e3 |
| Load Capacitance (CL) | 10pF |
| Logic IC Type | PLL BASED CLOCK DRIVER |
| Max I(ol) | 0.0005A |
| Number of Functions | 1 |
| Number of True Outputs | 7 |
| Output Characteristics | 3-STATE |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC48,.27SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 435mA |
| Qualification Status | Not Qualified |
| Same Edge Skew-Max (tskwd) | 0.1ns |
| Supply Voltage-Max (Vsup) | 3.45V |
| Supply Voltage-Min (Vsup) | 3.15V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| fmax-Min | 1296MHz |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LMK04000BISQX/NOPB:
PLL Based Clock Driver, 4000/14000/40000 Series, 7 True Output(s), 0 Inverted Output(s), BICMOS
Frequently Asked Questions
How does the differential input multiplexer on the LMK04000BISQX/NOPB enable clock redundancy in telecom line cards?
The LMK04000BISQX/NOPB's differential input MUX allows selection between multiple reference clock sources, enabling hitless switchover from a primary 122.88 MHz OCXO to a backup GPS-derived reference without introducing glitches on the distributed output clocks. This architecture meets Stratum 3 holdover requirements in SDH/SONET and packet-transport-network line cards.
What output load capacitance does the LMK04000BISQX/NOPB drive, and how does that affect clock trace design?
The LMK04000BISQX/NOPB is specified with a 10 pF per-output load capacitance, requiring controlled-impedance 50-ohm or 100-ohm differential traces shorter than 80 mm to avoid signal reflections. For longer clock traces, a series 33-ohm termination resistor within 5 mm of the driver output is recommended to preserve signal integrity at frequencies above 200 MHz.
Which PCB package does the LMK04000BISQX/NOPB use, and what are the key layout considerations?
The LMK04000BISQX/NOPB uses a 48-pin QFN (JESD-30 S-XQCC-N48) with a central exposed thermal pad. A 4-layer PCB with a solid ground plane under the QFN and at least 8 via-in-pad connections to the ground pour is recommended to minimize inductance on the AGND and DGND pins and achieve sub-100 fs additive jitter performance.
For an FPGA clocking design, how many independent clock domains can the LMK04000BISQX/NOPB serve simultaneously?
The LMK04000BISQX/NOPB distributes multiple synchronized low-jitter clock outputs from a single PLL reference, enabling it to serve several FPGA clock domains — such as a 250 MHz fabric clock, a 156.25 MHz Ethernet SERDES reference, and a 122.88 MHz DSP clock — all phase-aligned to a single 10 MHz or 122.88 MHz master reference.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 500+ | $13.3600 | $6680.00 |
| 1000+ | $12.6100 | $12610.00 |
| 10000+ | $11.8700 | $118700.00 |
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