Skyworks Solutions Inc. SI5351B-B02073-GMR

Overview

SI5351B-B02073-GMR from Skyworks Solutions is an I²C-programmable, 8-output CMOS clock generator with integrated VCXO, designed to replace crystals, crystal oscillators, and voltage-controlled oscillators in cost-sensitive embedded timing applications. It delivers up to eight independent, non-integer-related frequencies from 2.5 kHz to 200 MHz per output, supports 0 ppm synthesis error, and operates from a 25 or 27 MHz fixed-frequency crystal.

For engineers reviewing the SI5351B-B02073-GMR datasheet, SI5351B-B02073-GMR pinout, SI5351B-B02073-GMR application, or SI5351B-B02073-GMR equivalent, this device offers verified VCXO tuning range (±240 ppm), low period jitter (< 70 ps pk-pk), configurable output drive (1.8/2.5/3.3 V), and I²C-based dynamic frequency reconfiguration without glitches.

Technical Context

The SI5351B-B02073-GMR implements a dual-PLL architecture: PLL A accepts either the internal crystal oscillator (25/27 MHz) or external CLKIN (10–100 MHz), while PLL B functions as a highly linear VCXO with tunable gain (18–150 ppm/V) and ±5% linearity over 10–90% VDD. Both PLLs feed eight independent MultiSynth fractional dividers for precise frequency synthesis.

Each of its eight outputs supports programmable rise/fall time, static phase offset, spread spectrum (±0.1–±1.5% deviation at 31.5 kHz), and HCSL-compatible swing. The device uses separate VDD (2.5/3.3 V) and VDDO (1.8/2.5/3.3 V) rails for core logic and output buffers, enabling level translation across mixed-voltage systems.

Key Specifications

Pinout & Package

SI5351B-B02073-GMR is housed in a 20-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per Skyworks Si5351B 20-QFN pinout specification (Rev. 1.3, Section 10.2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5351B-B02073-GMR, the Si5351A-B-GM sacrifices VCXO flexibility for lower cost, while the Si5351C-B-GM trades analog tuning for external reference synchronization - making the SI5351B-B02073-GMR uniquely suited for applications requiring both stability and tunability from a single crystal.

Availability

SI5351B-B02073-GMR is available at Aetrix Electronics and suitable for audio/video equipment, networking/communication infrastructure, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5351B-B02073-GMR 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

Skyworks Solutions is a global leader in analog and mixed-signal semiconductors, specializing in RF, mobile, infrastructure, and timing solutions with over 40 years of RF and clocking expertise.

The Si5351 family was engineered to replace discrete timing components in cost-sensitive, space-constrained applications - delivering programmable multi-output clock generation with VCXO-grade stability in a single QFN package.

FAQ

What is the maximum number of unique frequencies above 112.5 MHz that SI5351B-B02073-GMR can generate simultaneously?

The SI5351B-B02073-GMR supports only two unique frequencies above 112.5 MHz at once - for example, 125 MHz on CLK0 and 130 MHz on CLK1. Additional outputs above 112.5 MHz must duplicate one of those two frequencies. This limitation arises from internal PLL bandwidth constraints and is explicitly specified in Table 7 of the Skyworks datasheet Rev. 1.3.

Does SI5351B-B02073-GMR require external load capacitors for the 25 MHz crystal?

No - SI5351B-B02073-GMR integrates programmable internal load capacitance (0, 6, 8, or 10 pF) optimized for standard 25/27 MHz AT-cut crystals. External capacitors are only needed if the crystal specifies >10 pF load capacitance (e.g., 12 pF), in which case ≤2 pF total external capacitance is added across XA/XB per Skyworks AN551 guidelines.

Can SI5351B-B02073-GMR generate spread spectrum clocking on individual outputs?

Yes - SI5351B-B02073-GMR supports independent spread spectrum enable/disable and modulation depth (±0.1% to ±2.5%) per output via dedicated register bits. Each output can be configured for down-spread or center-spread modulation at 31.5 kHz, allowing targeted EMI reduction without affecting other clock domains.

What is the guaranteed VCXO linearity specification for SI5351B-B02073-GMR?

The SI5351B-B02073-GMR guarantees ±5% VCXO control voltage linearity (KVL) over the 10–90% VDD range, as measured in Table 5 of the official Skyworks datasheet Rev. 1.3. This ensures predictable, monotonic frequency tuning behavior across the full VC input voltage span.

Is SI5351B-B02073-GMR pin-compatible with other Si5351 variants in the 20-QFN package?

Yes - SI5351B-B02073-GMR shares identical pinout, footprint, and thermal pad layout with Si5351A-B-GM and Si5351C-B-GM in the 20-QFN (4×4 mm) package. All three variants use the same mechanical outline and land pattern per Section 12.1 and 12.2 of the Skyworks datasheet, enabling drop-in substitution where functional requirements align.