Skyworks Solutions Inc. SI5338N-B04336-GMR

Overview

SI5338N-B04336-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 and SRNS compliance, and MultiSynth™ frequency synthesis supporting 0.16–710 MHz output ranges across LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338N-B04336-GMR datasheet, SI5338N-B04336-GMR pinout, SI5338N-B04336-GMR application, or SI5338N-B04336-GMR equivalent, key selection criteria include PCIe Gen 4 common-clock jitter (0.15–0.45 ps RMS), independent per-output voltage control (1.5/1.8/2.5/3.3 V), 4×4 mm 24-QFN package, and I²C/SMBus programmability with ClockBuilder Pro support.

Technical Context

The SI5338N-B04336-GMR integrates a dual-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) followed by four independent MultiSynth™ fractional-N synthesis paths. Each output driver supports format- and voltage-selectable signaling with programmable phase offset (±45 ns, <20 ps step) and glitchless frequency increment/decrement (1 ppm steps).

It operates across –40 to +85 °C with core supply options of 1.8 V, 2.5 V, or 3.3 V and output buffer supplies from 1.4 V to 3.63 V. Input flexibility includes differential (5–710 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and 8–30 MHz crystal references - all enabling zero-ppm precision synthesis on all four outputs.

Key Specifications

Pinout & Package

SI5338N-B04336-GMR uses a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per the Si5338 family: IN1/IN2 (differential ref 1), IN3/IN4 (single-ended ref), IN5/IN6 (differential ref 2), CLK0A/CLK0B through CLK3A/CLK3B (four differential output pairs), VDDO0–VDDO3 (independent output supply pins), VDD (core supply), SCL/SDA (I²C interface), INTR (interrupt output), and RSVD_GND (reserved ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B04336-GM and LMK04832RHAR, SI5338N-B04336-GMR uniquely balances field-programmability, four independent synthesis engines, PCIe Gen 4 compliance, and 4×4 mm footprint - making it optimal for space-constrained, multi-protocol embedded systems requiring post-production timing calibration.

Availability

SI5338N-B04336-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switching/routing, and broadcast video equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338N-B04336-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 programmable, low-jitter clock generation for high-speed serial interfaces including PCIe, Ethernet, Fibre Channel, and broadcast video - targeting systems where timing precision, integration density, and field configurability are critical.

FAQ

What is the primary function of the SI5338N-B04336-GMR?

The SI5338N-B04336-GMR is an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output clocks (0.16–710 MHz) from a single reference input. It replaces up to four discrete oscillators while supporting PCIe Gen 1–4, Ethernet, and broadcast video timing standards. Its MultiSynth™ architecture ensures zero-ppm frequency accuracy on all outputs.

Does the SI5338N-B04336-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338N-B04336-GMR meets PCIe Gen 4 common-clock jitter specifications (0.15–0.45 ps RMS, 10 kHz–50 MHz) and is SRNS-compliant for Gen 3. It achieves this with optimized PLL loop bandwidth (2–5 MHz), low intrinsic phase noise, and differential output drivers - validated using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4.

How many reference inputs does the SI5338N-B04336-GMR support?

The SI5338N-B04336-GMR supports six physical reference inputs: two differential pairs (IN1/IN2 and IN5/IN6), two single-ended inputs (IN3 and IN4), and optional crystal connection (8–30 MHz). These enable flexible clock sourcing - e.g., primary crystal + backup differential reference - with automatic failover and loss-of-signal detection.

Can output voltages be configured independently on the SI5338N-B04336-GMR?

Yes, the SI5338N-B04336-GMR provides four dedicated output supply pins (VDDO0–VDDO3), allowing independent voltage configuration per output driver (1.5 V, 1.8 V, 2.5 V, or 3.3 V). This enables direct interfacing with mixed-voltage devices - such as 1.2 V FPGA banks and 3.3 V legacy peripherals - without level-shifting circuitry.

Is ClockBuilder Pro software required to configure the SI5338N-B04336-GMR?

No, ClockBuilder Pro is optional but strongly recommended for SI5338N-B04336-GMR configuration. It provides GUI-based frequency planning, jitter analysis, and register file generation. The device can also be programmed directly via I²C using custom firmware - though ClockBuilder Pro ensures correct register settings for PCIe, Ethernet, and other compliance-critical applications.