Texas Instruments LMK62I0-156M25SIAT

Overview

LMK62I0-156M25SIAT from Texas Instruments is a factory-programmed, low-jitter HCSL oscillator delivering 156.25 MHz output with ±25 ppm total frequency stability, 3.3-V supply operation, and 150 fs RMS phase jitter (12 kHz–20 MHz) over –40°C to +85°C. It serves as a high-stability timing reference for FPGA clocking, Base Band Unit (BBU) synchronization, and high-speed serial interface recovery in telecom infrastructure.

For engineers reviewing the LMK62I0-156M25SIAT datasheet, LMK62I0-156M25SIAT pinout, LMK62I0-156M25SIAT application, or LMK62I0-156M25SIAT equivalent, this device is selected for its HCSL drive capability, robust PSRR (–60 dBc), industrial temperature range, and pin-compatible 5-mm × 3.2-mm QFM package-critical for space-constrained, noise-sensitive clock distribution networks.

Technical Context

The LMK62I0-156M25SIAT integrates a high-performance PLL-based oscillator core with internal power conditioning to suppress supply noise, enabling stable 156.25 MHz HCSL output without external loop filters. Its differential HCSL output complies with JEDEC HCSL v1.0 specifications, featuring VOH ≥ 660 mV, VOL ≤ 100 mV, and VCROSS between 250–475 mV.

Operation requires only a single 3.3-V ±5% supply and supports output enable control via LVCMOS OE input (VIH = 1.4 V, VIL = 0.6 V), with 50 µs enable/disable timing and internal pulldown. Startup completes within 10 ms after VDD reaches 3.135 V.

Key Specifications

Pinout & Package

The LMK62I0-156M25SIAT uses a 6-pin Quad Flat Module (QFM) package designated SIA, measuring 5.0 mm × 3.2 mm with 1.1 mm max height and pin-compatible footprint with industry-standard 5032 crystal oscillators.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMK62A2-156M25SIAT and LMK62E0-156M25SIAT, the LMK62I0-156M25SIAT offers optimal integration for modern FPGAs with native HCSL inputs-eliminating termination components, reducing power vs. LVPECL, and providing better noise immunity than LVDS in dense PCB layouts.

Availability

LMK62I0-156M25SIAT is available at Aetrix Electronics and suitable for 5G infrastructure, high-performance computing, and medical imaging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LMK62I0-156M25SIAT 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 LMK62XX family is designed for high-speed digital systems demanding ultra-low jitter, excellent PSRR, and flexible output formats-targeting telecom, datacenter, test equipment, and industrial FPGA-based platforms.

FAQ

What is the recommended power supply bypassing scheme for LMK62I0-156M25SIAT?

TI specifies a three-capacitor network: 10 µF (bulk), 1 µF (mid-frequency), and 0.1 µF (high-frequency), all placed as close as possible to the VDD pin with short, low-inductance traces to GND. Use 0201 or 0402 case sizes, mount on the component side, and connect GND via ≥3 thermal vias to minimize impedance and maximize PSRR effectiveness.

Can LMK62I0-156M25SIAT be used with LVDS or LVPECL receivers?

No-LMK62I0-156M25SIAT is factory-configured exclusively for HCSL output. Its VOH/VOL levels (660–900 mV / –100–100 mV) and 50-Ω source termination do not meet LVDS (300–480 mV swing, 107-Ω Z₀) or LVPECL (700–1200 mV, 150-Ω termination) specifications. Interfacing requires an external level translator or selection of LMK62A2- or LMK62E0-series variants.

What is the function of the NC pin (Pin 2) on LMK62I0-156M25SIAT?

Pin 2 is a no-connect (NC) terminal with no internal bond wire or circuit connection. TI's datasheet explicitly defines it as "N/A" and recommends leaving it unconnected-neither grounded nor tied to any voltage. Routing copper under this pad is acceptable, but no signal or power should be assigned to it.

How does the OE pin behave during power-up if left unconnected?

The OE pin has an internal pulldown resistor, so if left unconnected (floating), it defaults to logic low-disabling the output pair and placing OUTP/OUTN in high-impedance state. To enable output, OE must be actively driven high (≥1.4 V) via external 10 kΩ pullup or controller GPIO; startup delay from OE assertion to valid output is 50 µs.