Skyworks Solutions Inc. SI5338N-B05026-GM

Overview

SI5338N-B05026-GM 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 SI5338N-B05026-GM datasheet, SI5338N-B05026-GM pinout, SI5338N-B05026-GM application, or SI5338N-B05026-GM 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 SI5338N-B05026-GM implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) feeding a fractional-N MultiSynth™ synthesis stage per output. Each of the four outputs features independent R, M, and P dividers enabling integer or fractional frequency synthesis with true zero-ppm accuracy.

It supports flexible input references - including 8–30 MHz crystals, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, and 5–710 MHz differential inputs - and offers independent output format selection (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL), phase adjustment (<20 ps steps), and glitchless frequency increment/decrement (1 ppm steps).

Key Specifications

Pinout & Package

SI5338N-B05026-GM uses a 24-pin QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per the Si5338 family and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B-GM, SI5338N-B05026-GM provides full field programmability and dynamic tuning; versus LMK04832, it delivers lower jitter in PCIe-optimized configurations, smaller footprint, and integrated crystal support - making it superior for embedded switch/router and broadcast timing where size and jitter are critical.

Availability

SI5338N-B05026-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switching/routing, and broadcast video timing applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338N-B05026-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 precision analog ICs for infrastructure and mobile markets.

The Si5338 product line was designed for high-performance, multi-protocol clock generation in data center, telecom, and broadcast systems - emphasizing low jitter, software configurability, and integration of up to four timing functions in one compact package.

FAQ

What is the default factory configuration of the SI5338N-B05026-GM?

The SI5338N-B05026-GM ships with blank OTP memory and requires initial programming via I²C using ClockBuilder Pro or custom firmware. Unlike factory-programmed variants (e.g., Si5338A-B-GM), it contains no preloaded configuration - enabling full flexibility for end-user-defined frequency plans, output formats, and spread-spectrum settings at system integration.

Does the SI5338N-B05026-GM support PCIe Gen 4 Common Clock compliance out of the box?

Yes, the SI5338N-B05026-GM meets PCIe Gen 4 Common Clock jitter specifications (≤0.45 ps RMS, 10 kHz–50 MHz) when configured with appropriate loop bandwidth (2–4 MHz), HCSL outputs at 100 MHz, and a low-noise differential reference. Its datasheet specifies this performance under standard test conditions, and Skyworks provides validated ClockBuilder Pro profiles for immediate Gen 4 deployment.

Can the SI5338N-B05026-GM generate two outputs above 350 MHz simultaneously?

Yes, but only two unique frequencies above 350 MHz may be generated simultaneously - specifically Fvco/4 and Fvco/6 - due to VCO frequency constraints. For example, with a 2.8 GHz VCO, outputs can be set to 700 MHz (Fvco/4) and 466.67 MHz (Fvco/6). All other outputs must remain ≤350 MHz or use integer-related harmonics within that limit.

How does the SI5338N-B05026-GM handle loss-of-signal detection?

The SI5338N-B05026-GM monitors all six input pins (IN1–IN6) for loss-of-signal (LOS) with detection times of 2.6–5 µs and release times of 0.01–1 µs. Detected events assert the open-drain INTR pin and are accessible via I²C register reads (0x000D[7:6]), enabling host microcontroller response or automatic failover to a backup reference without external circuitry.

Is external crystal load capacitance adjustment required for the SI5338N-B05026-GM?

Yes - the SI5338N-B05026-GM supports on-chip crystal load capacitance of 11–13 pF, but Skyworks recommends 17–19 pF for optimal stability. Users must adjust internal registers (per AN360) to match their selected crystal's specified load capacitance; failure to do so may cause start-up failure or frequency inaccuracy beyond ±50 ppm.