Skyworks Solutions Inc. SI5351A-B05069-GM

Overview

SI5351A-B05069-GM from Skyworks Solutions is an I²C-programmable 8-output CMOS clock generator with integrated crystal oscillator, generating free-running frequencies from 2.5 kHz to 200 MHz per output with 0 ppm synthesis error, low period jitter (<70 ps pk-pk), and independent 1.8/2.5/3.3 V output supply rails - used in residential gateways, audio/video equipment, and networking systems requiring multi-domain clocking.

For engineers reviewing the SI5351A-B05069-GM datasheet, SI5351A-B05069-GM pinout, SI5351A-B05069-GM application, or SI5351A-B05069-GM equivalent, key selection criteria include its 20-QFN-20 package, VCXO-free Si5351A variant identity, 8-output capability, 25/27 MHz crystal reference requirement, and I²C-configurable MultiSynth fractional divider architecture.

Technical Context

The SI5351A-B05069-GM implements a dual-PLL architecture with PLL A only (no VCXO or CLKIN support), driven exclusively by a 25 or 27 MHz crystal connected to XA/XB pins. Its eight outputs are synthesized via independent high-resolution MultiSynth fractional dividers, each capable of exact non-integer frequency generation up to 200 MHz.

It supports programmable rise/fall time control, static phase offset, glitchless frequency changes, and configurable spread spectrum on each output. Core logic operates at 2.5 or 3.3 V, while output buffers are independently powered at 1.8, 2.5, or 3.3 V - enabling level translation across mixed-voltage system domains without external level shifters.

Key Specifications

Pinout & Package

SI5351A-B05069-GM is housed in a 20-pin QFN (4 mm × 4 mm) with exposed thermal pad. Pin functions align with the Si5351A 20-pin QFN configuration per Skyworks datasheet Rev. 1.3, Section 10.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5351A-B-GM, SI5351A-B05069-GM offers guaranteed out-of-box operation with preloaded configuration, while Si5351B-B-GM provides essential VCXO capability at the cost of higher component cost and design complexity - making SI5351A-B05069-GM optimal for fixed-frequency, crystal-replacement applications demanding zero-configuration reliability.

Availability

SI5351A-B05069-GM is available at Aetrix Electronics and suitable for residential gateways, audio/video equipment, and industrial networking switches requiring stable component supply, long-term lifecycle support, and guaranteed factory-programmed configuration integrity.

Supply support for SI5351A-B05069-GM 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 power management technologies.

The Si5351A-B05069-GM belongs to Skyworks' Si5351 family of I²C-programmable clock generators designed specifically to replace multiple crystals, oscillators, and PLLs in cost-sensitive, space-constrained consumer and networking applications.

FAQ

What is the reference clock requirement for SI5351A-B05069-GM?

The SI5351A-B05069-GM requires a 25 MHz or 27 MHz fundamental-mode AT-cut crystal connected across XA and XB pins. It does not accept external clock inputs (CLKIN) or voltage-controlled tuning (VC), as it is the Si5351A variant - confirmed by Skyworks datasheet Rev. 1.3, Table 1 and Section 4.1.1. No VCXO or CLKIN functionality is present in SI5351A-B05069-GM.

Does SI5351A-B05069-GM support spread spectrum clocking?

Yes, SI5351A-B05069-GM supports configurable spread spectrum on each of its eight outputs. Down-spread (–0.1% to –2.5%) and center-spread (±0.1% to ±1.5%) modes are selectable per output via I²C register writes, as specified in Skyworks datasheet Rev. 1.3, Table 5 and Section 4.4. This feature reduces electromagnetic interference without affecting functional timing margins.

What is the maximum number of unique high-frequency outputs supported by SI5351A-B05069-GM?

SI5351A-B05069-GM supports up to two unique output frequencies above 112.5 MHz simultaneously (e.g., 125 MHz and 130 MHz), as defined in Skyworks datasheet Rev. 1.3, Table 7 Note 1. Multiple copies of the same high-frequency signal (e.g., four 125 MHz outputs) are permitted, but three distinct frequencies >112.5 MHz violate internal resource allocation.

Can SI5351A-B05069-GM generate sub-1 MHz clock frequencies?

Yes, SI5351A-B05069-GM can generate frequencies as low as 2.5 kHz using its integer division stage after MultiSynth synthesis, per Skyworks datasheet Rev. 1.3, Table 7. This enables direct replacement of low-frequency RTC or microcontroller watchdog clocks without external dividers.

Is SI5351A-B05069-GM pin-compatible with other Si5351 variants in the 20-QFN package?

Yes, SI5351A-B05069-GM uses the identical 20-pin QFN (4 mm × 4 mm) footprint and pinout as all Si5351A/B/C 20-QFN variants per Skyworks datasheet Rev. 1.3, Section 10.1. However, unused pins (e.g., VC, CLKIN) must remain unconnected or tied to appropriate voltages per variant-specific guidelines - SI5351A-B05069-GM leaves VC and CLKIN pins NC.