Texas Instruments LMK60I2-322M26SIAT

Overview

LMK60I2-322M26SIAT from Texas Instruments is a factory-programmed, high-performance HCSL-output oscillator delivering 322.265625 MHz with ±50 ppm total frequency tolerance, 150 fs RMS phase jitter (12 kHz–20 MHz), and robust –60 dBc PSRR across 50 kHz–1 MHz supply ripple. It operates from a single 3.3-V supply in industrial temperature range (–40°C to +85°C) and serves as a low-jitter clock source for FPGA transceivers and high-speed serial interfaces.

For engineers reviewing the LMK60I2-322M26SIAT datasheet, LMK60I2-322M26SIAT pinout, LMK60I2-322M26SIAT application, or LMK60I2-322M26SIAT equivalent, key selection criteria include HCSL output compatibility with Intel/Altera FPGA reference clocks, 7 mm × 5 mm QFM package footprint alignment with industry-standard 7050 XO footprints, and verified startup time ≤10 ms under 3.135 V VDD.

Technical Context

The LMK60I2-322M26SIAT integrates a high-stability PLL-based core with internal power conditioning to suppress supply noise, enabling clean clock generation without external regulators. Its HCSL output stage is optimized for 50 Ω differential termination and delivers 660–900 mV VOH and –100–100 mV VOL into 50 Ω loads.

It features an LVCMOS OE input with internal pull-up, enabling hardware-controlled output disable with 50 µs enable/disable timing. The device uses a fixed-frequency architecture-no I²C or SPI interface-and is pre-configured at manufacture for its exact 322.265625 MHz output.

Key Specifications

Pinout & Package

The LMK60I2-322M26SIAT 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 and designed for surface-mount reflow assembly per J-STD-20 Level-3 (260°C peak).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-frequency HCSL oscillator applications.

Compared with LMK60E2-322M26SIAT, the LMK60I2-322M26SIAT saves board space and cost by eliminating external AC coupling and level-shifting components; versus Si510-322M265625, it offers simpler integration with zero firmware overhead and guaranteed startup timing, at the expense of programmability.

Availability

LMK60I2-322M26SIAT is available at Aetrix Electronics and suitable for PCIe Gen5 server designs, FPGA-based AI accelerators, optical transport line cards, and high-speed data acquisition systems requiring stable component supply and long-term production continuity.

Supply support for LMK60I2-322M26SIAT 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 specializing in analog, embedded processing, and clock solutions, with leadership in high-performance timing devices for datacenter, communications, and industrial markets.

The LMK60XX family is designed specifically for replacing quartz, SAW, and silicon oscillators in high-speed digital systems where ultra-low jitter, supply noise immunity, and drop-in package compatibility are critical.

FAQ

What is the recommended power supply decoupling for LMK60I2-322M26SIAT?

TI specifies a three-capacitor decoupling network on VDD: 10 µF (bulk), 1 µF (mid-frequency), and 0.1 µF (high-frequency), all placed as close as possible to the VDD pin using 0201 or 0402 case sizes. Ground connections must use low-inductance paths with multiple vias to the inner ground plane to maintain PSRR performance and minimize jitter.

Does LMK60I2-322M26SIAT require configuration or programming after soldering?

No. The LMK60I2-322M26SIAT is factory-programmed for its exact 322.265625 MHz HCSL output and requires no post-soldering configuration. It powers up and begins generating a valid clock within ≤10 ms of VDD reaching 3.135 V, with no I²C, SPI, or other interface needed.

Can the OE pin be left unconnected or tied to VDD permanently?

Yes. The OE pin has an internal pull-up resistor, so leaving it open or tying it to VDD enables the output continuously. To disable the output, OE must be actively driven low (≤0.6 V). Floating OE is safe and functionally equivalent to OE = VDD in normal operation.

Is the 7 mm × 5 mm QFM package of LMK60I2-322M26SIAT compatible with automated optical inspection (AOI)?

Yes. The SIA package uses exposed pad construction with defined solder mask openings and land pattern geometry compliant with IPC-7351B. Its 1.15 mm max height and 0.5 mm pitch allow reliable AOI detection of solder joint quality, bridging, and coplanarity-provided stencil design follows TI's recommended 86% area coverage and trapezoidal aperture profile.