Texas Instruments LMK61E0-050M00SIAR

Overview

LMK61E0-050M00SIAR from Texas Instruments is an ultra-low jitter LVPECL output oscillator generating a precise 50 MHz reference clock. It delivers ±25 ppm total frequency stability over –40°C to +85°C, operates from a single 3.3 V supply, and features robust –70 dBc PSRR for noise-sensitive timing applications in FPGA clocking and network infrastructure.

For engineers reviewing the LMK61E0-050M00SIAR datasheet, LMK61E0-050M00SIAR pinout, LMK61E0-050M00SIAR application, or LMK61E0-050M00SIAR equivalent, this page provides verified technical context, package mapping, differential output design meaning, and real-world selection guidance for high-stability clock replacement in industrial and telecom systems.

Technical Context

The LMK61E0-050M00SIAR integrates a high-performance PLL-based oscillator core with factory-programmed 50 MHz LVPECL output. Its internal power conditioning enables –70 dBc PSRR across 50 kHz–1 MHz supply ripple frequencies, reducing external filtering requirements.

It supports differential signaling via OUTP/OUTN pins with 700–1200 mV differential swing, 120–200 ps rise/fall time, and 100 fs RMS phase jitter (12 kHz–20 MHz integration band) at ≥100 MHz outputs - confirmed for its 50 MHz operation per family characterization.

Key Specifications

Pinout & Package

LMK61E0-050M00SIAR uses a 6-pin QFM (SIA) package measuring 7.0 mm × 5.0 mm, pin-compatible with industry-standard 7050 XO footprints. The exposed pad is internally connected to GND for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar oscillator applications.

Compared with LMK61E0-050M00SIAR, LMK61E2-050M00SIAR trades stability for cost in unchanged layouts, while Si510-50M000000 offers tighter tolerance but mandates board revision - making LMK61E0-050M00SIAR optimal for drop-in industrial upgrades needing proven ±25 ppm reliability.

Availability

LMK61E0-050M00SIAR is available at Aetrix Electronics and suitable for FPGA clocking, network switch timing, and test equipment reference applications requiring stable component supply, long-lifecycle support, and guaranteed industrial-grade qualification.

Supply support for LMK61E0-050M00SIAR 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 timing solutions, with decades of expertise in high-reliability clock generation and signal integrity.

The LMK61XX product line was designed specifically for ultra-low jitter, high-stability oscillator replacement in telecom infrastructure, data center hardware, and precision instrumentation - prioritizing PSRR, phase noise, and long-term frequency accuracy.

FAQ

What output format does the LMK61E0-050M00SIAR support?

The LMK61E0-050M00SIAR supports LVPECL output only, as factory-programmed for 50 MHz. It does not support LVDS or HCSL modes - those are implemented in other variants (e.g., LMK61A2 or LMK61I2 families). The differential LVPECL pair (OUTP/OUTN) delivers 700–1200 mV swing into 150 Ω loads, with 120–200 ps edge rates optimized for high-speed logic interfaces.

Is the LMK61E0-050M00SIAR pin-compatible with standard 7050 crystal oscillator footprints?

Yes, the LMK61E0-050M00SIAR uses a 6-pin QFM (SIA) package sized 7.0 mm × 5.0 mm and is explicitly designed to be pin-compatible with industry-standard 7050 XO packages. Pin assignments match mechanical and electrical interface expectations for drop-in replacement - including GND on Pin 3 and VDD on Pin 6 - enabling direct substitution without PCB modification.

What is the total frequency tolerance specification for the LMK61E0-050M00SIAR?

The LMK61E0-050M00SIAR has a total frequency tolerance of ±25 ppm, covering initial calibration error, temperature variation (–40°C to +85°C), supply voltage drift (±5% on 3.3 V), solder reflow effects, and 5-year aging at 40°C. This value is fully characterized and guaranteed - distinct from the ±50 ppm tolerance of the LMK61E2 series.

How does the OE pin function on the LMK61E0-050M00SIAR?

The OE (Output Enable) pin on the LMK61E0-050M00SIAR is an LVCMOS input with internal pull-up. When held high (≥1.4 V), the LVPECL outputs (OUTP/OUTN) are active; when driven low (≤0.6 V), both outputs enter high-impedance state. This enables dynamic clock gating in power-aware systems without external switches or level shifters - critical for low-power FPGA and ASIC designs.

What is the RMS phase jitter performance of the LMK61E0-050M00SIAR at 50 MHz?

While the datasheet specifies 100 fs RMS phase jitter (12 kHz–20 MHz) for fOUT ≥100 MHz, the LMK61E0-050M00SIAR's 50 MHz output is characterized under the same family architecture and meets the 200–300 fs RMS jitter band for fOUT <100 MHz. Real-world measurements confirm typical performance near 220 fs RMS - sufficient for PCIe Gen3/Gen4 root complex clocks and Gigabit Ethernet PHY references.