Texas Instruments LMK61I2-100M00SIAT

Overview

LMK61I2-100M00SIAT from Texas Instruments is a factory-programmed, ultra-low-jitter HCSL oscillator delivering 100 MHz output with ±50 ppm total frequency tolerance, 90 fs RMS phase jitter (12 kHz–20 MHz), and robust –70 dBc PSRR at 3.3 V supply. It serves as a high-stability clock reference for FPGA and processor clocking in industrial-grade networking and computing systems.

For engineers reviewing the LMK61I2-100M00SIAT datasheet, LMK61I2-100M00SIAT pinout, LMK61I2-100M00SIAT application, or LMK61I2-100M00SIAT equivalent, key selection criteria include HCSL output compatibility, 7 mm × 5 mm QFM package footprint, 400 MHz max HCSL frequency support, and OE-controlled output enable/disable functionality.

Technical Context

The LMK61I2-100M00SIAT integrates a high-performance PLL-based oscillator core with internal power conditioning to suppress supply noise, enabling stable 100 MHz HCSL output without external loop filters or crystal components. Its architecture supports fast startup (<10 ms) and low-latency output control via LVCMOS OE input.

HCSL output stage delivers 600–850 mV VOH and –100–100 mV VOL into 50 Ω loads, with VCROSS centered at 250–475 mV and dV/dt slew rate of 0.8–2 V/ns - optimized for direct interface with Intel/AMD FPGA HCSL clock inputs and high-speed SerDes PHYs.

Key Specifications

Pinout & Package

LMK61I2-100M00SIAT uses a 6-pin QFM (7.0 mm × 5.0 mm) surface-mount package, pin-compatible with industry-standard 7050 XO footprints and designed for automated assembly with JEDEC-compliant reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMK61E2-100M00SIAT and LMK61A2-100M00SIAT, the LMK61I2-100M00SIAT uniquely provides native HCSL drive with optimal VOH/VOL and VCROSS for Intel/AMD FPGA clock trees - eliminating external components, reducing BOM cost, and improving signal integrity over LVPECL/LVDS alternatives.

Availability

LMK61I2-100M00SIAT is available at Aetrix Electronics and suitable for PCIe Gen2 clocking, FPGA high-speed I/O timing, Baseband Unit (BBU) synchronization, and test & measurement instrument clocking requiring stable component supply and guaranteed long-term availability.

Supply support for LMK61I2-100M00SIAT 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 solutions, with decades of expertise in precision timing and signal integrity.

The LMK61XX family was engineered specifically for high-performance clock replacement in datacenter, telecom, and test equipment - delivering ultra-low jitter, integrated power conditioning, and multiple output formats in a compact QFM package.

FAQ

What is the recommended power supply decoupling for LMK61I2-100M00SIAT?

TI specifies a three-capacitor network: 10 µF tantalum or ceramic, 1 µF X7R ceramic, and 0.1 µF X7R ceramic, all mounted on the component side with shortest possible traces to VDD and GND pins. At least three 0.3-mm thermal vias must connect GND pin to inner ground plane to ensure thermal stability and low-impedance return paths.

Can LMK61I2-100M00SIAT be used with Xilinx UltraScale+ FPGAs?

Yes - its HCSL output meets Xilinx DS924 specification for HCSL-compatible clock inputs. The device's 600–850 mV VOH, –100–100 mV VOL, and 250–475 mV VCROSS align precisely with UltraScale+ clock buffer requirements, enabling direct connection without level shifters or external termination resistors.

Does LMK61I2-100M00SIAT require external programming or configuration?

No - it is factory-programmed for fixed 100 MHz HCSL output and requires no I²C, SPI, or pin-strapping configuration. All timing parameters, output format, and frequency are permanently set during manufacturing; only OE control and power supply connections are needed for operation.

How does the OE pin behave during power-up?

The OE pin has an internal pull-up resistor, so outputs remain in high-impedance state until OE is actively driven low. Startup sequence begins only after VDD reaches ≥3.135 V and stabilizes; output enables within 10 ms, and OE-driven disable occurs within 50 µs - ensuring glitch-free clock gating during system initialization.