Skyworks Solutions Inc. SI5338A-B01392-GMR

Overview

SI5338A-B01392-GMR from Skyworks Solutions is an I²C-programmable quad clock generator with four independently configurable differential or single-ended outputs, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and operation across –40 to +85 °C in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338A-B01392-GMR datasheet, SI5338A-B01392-GMR pinout, SI5338A-B01392-GMR application, or SI5338A-B01392-GMR equivalent, key selection criteria include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage control (1.5/1.8/2.5/3.3 V), spread-spectrum capability (0.5–5.0% down-spread), and I²C/SMBus programmability with ClockBuilder Pro support.

Technical Context

The SI5338A-B01392-GMR implements a two-stage PLL architecture: a high-stability integer-N PLL (Stage 1) locks to one of six input references (crystal, CMOS, SSTL/HSTL, or differential), followed by four independent MultiSynth™ fractional-N synthesizers (Stage 2) generating outputs with 1 ppb frequency resolution. Each output driver supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats.

It features independent phase adjustment (<20 ps step accuracy), glitchless frequency increment/decrement (1 ppm steps), loss-of-lock and loss-of-signal alarms, and external feedback mode for zero-delay operation. The device uses on-chip OTP NVM for configuration storage and supports both I²C register access and pin-controlled real-time tuning.

Key Specifications

Pinout & Package

The SI5338A-B01392-GMR is housed in a 24-lead, 4 × 4 mm QFN package with exposed thermal pad. Pin functions are validated per Skyworks Rev. 1.6 datasheet (pages 33–37).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B01389-GM, SI5338A-B01392-GMR offers identical hardware but distinct factory OTP settings-making it ideal for systems requiring specific pre-boot clock outputs. Against LMK04832RHAT, SI5338A-B01392-GMR provides lower power, smaller footprint, and simpler I²C-only configuration at the expense of JESD204B support and deterministic latency features.

Availability

SI5338A-B01392-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switching/routing, and broadcast video timing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338A-B01392-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 semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, broadband, automotive, and industrial markets.

The Si5338 product line delivers highly configurable, low-jitter clock generation for high-speed serial interfaces-including PCIe, Ethernet, Fibre Channel, and broadcast video-where precise frequency synthesis and phase control are critical.

FAQ

What is the primary function of the SI5338A-B01392-GMR in a timing architecture?

The SI5338A-B01392-GMR serves as an I²C-programmable quad clock generator that synthesizes up to four independent, low-jitter output frequencies from a single input reference. Its MultiSynth™ technology enables true zero-ppm accuracy across all outputs, making it ideal for replacing multiple crystal oscillators in PCIe, Ethernet, and FPGA-based systems. SI5338A-B01392-GMR supports differential (LVDS/LVPECL/HCSL) and single-ended (CMOS/SSTL) formats with independent voltage control per output bank.

Does the SI5338A-B01392-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B01392-GMR meets PCIe Gen 4 Common Clock jitter specifications with ≤0.45 ps RMS (10 kHz–50 MHz) when configured per Skyworks' recommended settings. It is explicitly validated for PCIe Gen 4 compliance in the datasheet (Table 12), supporting both common clock and SRNS modes. SI5338A-B01392-GMR achieves this using its high-bandwidth PLL (1.6–4 MHz loop bandwidth) and low-noise MultiSynth™ synthesis stage.

Can the SI5338A-B01392-GMR generate non-integer-related output frequencies simultaneously?

Yes, the SI5338A-B01392-GMR supports fully independent frequency synthesis on all four outputs, including non-integer-related frequencies. Each MultiSynth™ output operates with 1 ppb resolution and can be set to arbitrary values within its supported range (e.g., 100.123456 MHz and 156.789012 MHz simultaneously). This capability is enabled by its fractional-N architecture and per-output R-divider bypass, confirmed in Section 3.3 of the datasheet.

How is the SI5338A-B01392-GMR programmed and configured?

The SI5338A-B01392-GMR is programmed via an I²C/SMBus-compatible serial interface operating at up to 400 kHz. Configuration is simplified using Skyworks' ClockBuilder Pro software, which generates custom configuration files and supports real-time register read/write. SI5338A-B01392-GMR stores settings in on-chip OTP memory, enabling autonomous operation after power-up without host intervention.

What thermal and power specifications apply to the SI5338A-B01392-GMR?

The SI5338A-B01392-GMR has a typical core supply current of 45 mA at 100 MHz output and 25 MHz reference, with thermal resistance θJA = 37 °C/W (still air). It operates across –40 to +85 °C and supports 1.8 V, 2.5 V, or 3.3 V core supply voltages. SI5338A-B01392-GMR's 4 × 4 mm QFN package includes an exposed thermal pad for enhanced heat dissipation in compact designs.