Texas Instruments LMK60E2-125M00SIAT

Overview

LMK60E2-125M00SIAT from Texas Instruments is a factory-programmed, low-jitter LVPECL oscillator delivering 125 MHz output with ±50 ppm total frequency stability over –40°C to +85°C, 3.3-V supply, and 150 fs RMS phase jitter (12 kHz–20 MHz). It serves as a high-performance clock reference in FPGA and processor timing systems requiring robust PSRR (–60 dBc) and differential signal integrity.

For engineers reviewing the LMK60E2-125M00SIAT datasheet, LMK60E2-125M00SIAT pinout, LMK60E2-125M00SIAT application, or LMK60E2-125M00SIAT equivalent, this page provides verified package mapping (6-pin QFM), confirmed LVPECL output behavior, thermal derating guidance, and validated alternatives for industrial-grade clocking designs.

Technical Context

The LMK60E2-125M00SIAT integrates a high-stability PLL-based oscillator core with internal power conditioning to achieve –60 dBc PSRR across 50 kHz–1 MHz supply ripple frequencies. Its output stage is configured exclusively for LVPECL signaling, supporting 700–1200 mV differential swing and 260–350 ps rise/fall times at 125 MHz.

Operation requires only a single 3.3-V ±5% supply, with OE pin enabling/disabling the differential output pair (OUTP/OUTN) in <50 µs. The device uses no external crystal or loop filter - all timing generation is self-contained and factory-trimmed.

Key Specifications

Pinout & Package

LMK60E2-125M00SIAT is housed in a 7.0 mm × 5.0 mm × 1.15 mm QFM (SIA) 6-pin package, pin-compatible with industry-standard 7050 XO footprints. The package features an exposed thermal pad connected internally to GND for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMK60E2-125M00SIAT, the SIAR variant offers identical performance at higher volume efficiency, while the Si510 delivers tighter stability and slightly higher jitter at the cost of layout incompatibility - making SIAT optimal for drop-in industrial timing upgrades.

Availability

LMK60E2-125M00SIAT is available at Aetrix Electronics and suitable for 5G baseband units, enterprise storage controllers, medical ultrasound systems, and industrial PLC CPU modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMK60E2-125M00SIAT 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and clock solutions for industrial, automotive, and communications markets.

The LMK60XX family is designed specifically for high-performance, low-jitter clock generation in FPGA, processor, and networking applications where crystal oscillators lack sufficient phase noise performance or supply immunity.

FAQ

Is the LMK60E2-125M00SIAT programmable in-system?

No. The LMK60E2-125M00SIAT is factory-programmed with fixed 125 MHz LVPECL output and cannot be reconfigured via I²C, SPI, or any other interface. Frequency, output format, and stability grade are set during manufacturing and immutable in the field.

What is the recommended termination for the LVPECL outputs?

Each LVPECL output (OUTP and OUTN) must be terminated to VDD–2 V using two 50-Ω resistors - one from OUTP to VDD–2 V, and one from OUTN to VDD–2 V - establishing a 100-Ω differential load. AC-coupling capacitors (e.g., 100 nF) are required if interfacing with AC-coupled receivers.

Does the NC pin require any PCB layout treatment?

Yes. Pin 2 (NC) is an unconnected die pad with no internal bond wire. It must remain electrically floating - no trace, copper pour, or solder mask opening should contact it. Routing or grounding this pin risks internal shorting or ESD path disruption.

Can the LMK60E2-125M00SIAT operate at 2.5 V?

No. The device is specified only for 3.3 V ±5% (3.135 V to 3.465 V). Operation below 3.135 V violates recommended conditions and may cause startup failure, increased jitter, or undefined OE behavior. A dedicated 3.3-V LDO or regulator is mandatory.