Skyworks Solutions Inc. SI5351A-B06284-GTR

Overview

SI5351A-B06284-GTR from Skyworks Solutions is an I²C-programmable 8-output CMOS clock generator with integrated VCXO, designed to replace crystals, crystal oscillators, and discrete PLLs in cost-sensitive embedded systems. It delivers up to eight independent frequencies from 2.5 kHz to 200 MHz with 0 ppm synthesis error, supports 1.8/2.5/3.3 V output voltage per bank, and operates from a 25 or 27 MHz fundamental-mode AT-cut crystal.

For engineers reviewing the SI5351A-B06284-GTR datasheet, SI5351A-B06284-GTR pinout, SI5351A-B06284-GTR application, or SI5351A-B06284-GTR equivalent, key selection criteria include its VCXO tuning range (±240 ppm at 3.3 V), low period jitter (<70 ps pk-pk), I²C configurability, HCSL-compatible swing support, and 20-QFN (4×4 mm) package with separate VDDO rails for level translation.

Technical Context

The SI5351A-B06284-GTR implements a dual-PLL architecture: PLL A accepts the internal crystal oscillator (25/27 MHz), while PLL B functions as a highly linear VCXO with configurable gain (18–150 ppm/V) and ±5% linearity. Each PLL feeds eight independent MultiSynth fractional dividers, enabling non-integer-related output frequencies.

It features per-output spread spectrum control (–0.1% to –2.5% down-spread or ±0.1% to ±1.5% center-spread), static phase offset adjustment, glitchless frequency reprogramming, and programmable rise/fall times. The device supports simultaneous generation of two unique frequencies above 112.5 MHz - e.g., 125 MHz on CLK0 and 130 MHz on CLK1 - with all outputs capable of 45–55% duty cycle at ≤160 MHz.

Key Specifications

Pinout & Package

SI5351A-B06284-GTR is housed in a 20-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are identical to the Si5351A 20-QFN variant per Skyworks datasheet Section 10.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5351B-B-GM, SI5351A-B06284-GTR omits VCXO tuning but retains identical frequency synthesis accuracy, jitter performance, and I²C programmability - making it optimal for cost-sensitive, free-running clock replacement. Against CDCE906PWR, it adds 2 extra outputs, spread spectrum, and 1.8 V output support - enabling next-generation low-power designs.

Availability

SI5351A-B06284-GTR is available at Aetrix Electronics and suitable for networking equipment, audio/video timing systems, and industrial handheld instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5351A-B06284-GTR 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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and precision analog products.

The Si5351 family was engineered to replace discrete timing components in space-constrained, cost-driven applications - delivering programmable multi-frequency clock generation with zero ppm synthesis error and industry-leading jitter performance.

FAQ

What is the maximum number of unique frequencies above 112.5 MHz that SI5351A-B06284-GTR can generate simultaneously?

The SI5351A-B06284-GTR supports exactly two unique frequencies above 112.5 MHz at once - for example, 125 MHz on CLK0 and 130 MHz on CLK1. Additional outputs may replicate either of those two frequencies, but no third distinct frequency >112.5 MHz is permitted per Skyworks datasheet Table 7 note.

Does SI5351A-B06284-GTR require external load capacitors for a 25 MHz crystal?

No. SI5351A-B06284-GTR integrates programmable internal load capacitance (0, 6, 8, or 10 pF) and is designed to operate directly with standard 25 MHz or 27 MHz AT-cut crystals having 6–10 pF load requirements - eliminating external capacitors. Crystals requiring 12 pF CL need ≤2 pF additional external capacitance.

Can SI5351A-B06284-GTR generate HCSL-compatible output levels?

Yes. SI5351A-B06284-GTR supports HCSL-compatible swing through programmable output drive strength and termination configuration. When configured for high-drive mode (50 Ω output impedance) and loaded with 50 Ω to VDD/2, it delivers ~800 mVpp differential swing - meeting HCSL receiver input thresholds without external components.

What is the guaranteed period jitter performance of SI5351A-B06284-GTR under worst-case conditions?

Per Skyworks datasheet Table 7, SI5351A-B06284-GTR guarantees ≤155 ps pk-pk period jitter when all eight outputs are active in the 20-QFN package. This specification applies at default high-drive strength (50 Ω), 3.3 V VDDO, and with 5 pF load - representing real-world worst-case frequency plans.

Is SI5351A-B06284-GTR pin-compatible with other Si5351 variants like Si5351B or Si5351C?

Yes - SI5351A-B06284-GTR shares identical pinout and package (20-QFN) with Si5351B and Si5351C variants. However, functional differences exist: SI5351A lacks VCXO and CLKIN inputs, so pins VC and CLKIN are no-connects and must remain unconnected in PCB layout.