Skyworks Solutions Inc. SI5392K-A-GM

Overview

SI5392K-A-GM from Skyworks Solutions is a 4-input, 2-output ultra-low-jitter clock multiplier and jitter attenuator with integrated crystal reference, supporting output frequencies up to 350 MHz in integer synthesis mode and delivering 85 fs RMS phase jitter (integer mode). It operates in free-run, locked, and holdover modes and is used in 10/40/100G networking line cards requiring precise, stable timing under dynamic input switching.

For engineers reviewing the SI5392K-A-GM datasheet, SI5392K-A-GM pinout, SI5392K-A-GM application, or SI5392K-A-GM equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, and validated alternative options for SyncE-compliant, high-reliability telecom and datacom timing designs.

Technical Context

The SI5392K-A-GM implements a fourth-generation DSPLL architecture with integrated crystal oscillator (Grade K), eliminating external XTAL components and reducing acoustic noise sensitivity during thermal ramping. Its MultiSynth™ dividers support independent integer-mode frequency synthesis per output, with programmable DSPLL loop bandwidth (0.1 Hz–4 kHz) for jitter attenuation tuning.

It features enhanced hitless switching between input clocks at 8 kHz–750 MHz (differential) or 8 kHz–250 MHz (LVCMOS), status monitoring (LOS/OOF/LOL), and in-circuit programmable OTP NVM enabling known-power-up configuration. The device supports I²C/SPI control and meets ITU-T G.8262 (SyncE) EEC Options 1 & 2 and G.8262.1 (eEEC) standards.

Key Specifications

Pinout & Package

SI5392K-A-GM uses a 44-pin LGA package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Skyworks Si5392 Family Reference Manual (Rev. 1.3, Section 5.1) and UG387 Evaluation Board schematic.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5392K-A-GM, SI5392J-A-GM offers broader synthesis flexibility at the cost of higher jitter in fractional mode, while SI5342D-A-GM sacrifices holdover intelligence and jitter performance for QFN manufacturability and legacy design reuse.

Availability

SI5392K-A-GM is available at Aetrix Electronics and suitable for 10/40/100G networking line cards, Synchronous Ethernet infrastructure, OTN muxponders, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for SI5392K-A-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and connectivity solutions for high-performance communications infrastructure.

The Si5392 family targets carrier-grade timing applications demanding ultra-low jitter, integrated references, and robust holdover - specifically engineered for 5G transport, optical networking, and precision instrumentation.

FAQ

What is the reference type used in SI5392K-A-GM?

The SI5392K-A-GM uses an integrated crystal reference (Grade K), meaning it contains a monolithic MEMS or quartz resonator inside the 44-LGA package. This eliminates the need for external crystals, load capacitors, or associated layout constraints. Unlike external-reference variants (e.g., SI5392A-A-GM), SI5392K-A-GM derives its free-run and holdover stability entirely from this on-die oscillator - a key differentiator confirmed in Skyworks' Ordering Guide Table 3 and Final Data Sheet Section 1.

Does SI5392K-A-GM support fractional synthesis?

No, SI5392K-A-GM supports integer-mode synthesis only, with a maximum output frequency of 350 MHz. This is explicitly defined in Skyworks' Table 3 (J/K/L/M/E Ordering Guide), where SI5392K-A-GM is listed under "Integer Only" synthesis mode. Fractional synthesis is reserved for SI5392J-A-GM and SI5392L-A-GM variants. Using SI5392K-A-GM in fractional mode is not supported and will not meet datasheet jitter or stability specifications.

What package and pin count does SI5392K-A-GM use?

SI5392K-A-GM uses a 44-pin Land Grid Array (LGA) package measuring 7 mm × 7 mm with 0.5 mm pitch and an exposed thermal pad. This is confirmed in Skyworks' Final Data Sheet Section 3 (Ordering Guide, Table 3) and validated against the SI5392 Evaluation Board (UG387) schematic. It is not a QFN device - the "-GM" suffix denotes green, RoHS-compliant LGA packaging for Grade K devices.

Which compliance standards does SI5392K-A-GM meet?

SI5392K-A-GM meets ITU-T G.8262 (Synchronous Ethernet) EEC Options 1 and 2, and ITU-T G.8262.1 (Enhanced SyncE) eEEC standards. These are explicitly stated in the Final Data Sheet Feature List (Section 1) and Functional Description (Section 4). Compliance is achieved through its DSPLL architecture, programmable loop bandwidth, holdover averaging, and jitter performance - not via external circuitry or firmware patches.

Can SI5392K-A-GM operate in zero-delay mode?

Yes, SI5392K-A-GM supports zero-delay mode, where IN3 becomes the feedback input (FB_IN) instead of a selectable clock input. This mode is documented in the Final Data Sheet Section 4.7.1 and Figure 6, and is enabled via register configuration. In zero-delay mode, the device locks the output phase to the FB_IN signal - essential for applications requiring deterministic phase alignment, such as coherent optical modulator drivers or test equipment calibration loops.