Skyworks Solutions Inc. SI5338N-B05182-GMR

Overview

SI5338N-B05182-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. It replaces up to four crystal oscillators in high-speed serial interface timing applications such as PCIe switch cards and 10 GbE line cards.

For engineers reviewing the SI5338N-B05182-GMR datasheet, SI5338N-B05182-GMR pinout, SI5338N-B05182-GMR application, or SI5338N-B05182-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 24-pin 4×4 mm QFN package with I²C/SMBus programming interface.

Technical Context

The SI5338N-B05182-GMR implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesis paths, each driving a configurable output buffer. Its input supports eight clock sources - including external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz) - enabling flexible system-level clock tree integration.

Each output driver supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats with independent supply voltage (VDDOx), programmable phase offset (±45 ns, <20 ps step), and glitchless frequency increment/decrement (1 ppm steps). The device operates from a single 1.8/2.5/3.3 V core supply and delivers low power consumption (45 mA typ at 100 MHz on all outputs).

Key Specifications

Pinout & Package

SI5338N-B05182-GMR is housed in a 24-pin, 4 × 4 mm QFN package 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 Si5332A-D05182-GM and ICS8430I-01T, the SI5338N-B05182-GMR uniquely balances full programmability, four independent outputs, PCIe Gen 4 compliance, and industrial temperature support - making it optimal for reconfigurable, high-density timing systems requiring field-upgradable clock trees.

Availability

SI5338N-B05182-GMR is available at Aetrix Electronics and suitable for PCIe switch timing, 10 GbE line card clocking, and FPGA-based signal processing applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338N-B05182-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, with leadership in RF, timing, and precision analog ICs for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed specifically for high-performance, programmable clock generation in data center, telecom, and broadcast equipment - emphasizing low jitter, multi-format flexibility, and seamless integration into complex timing architectures.

FAQ

What is the primary function of the SI5338N-B05182-GMR in a system?

The SI5338N-B05182-GMR serves as a fully programmable quad clock generator that synthesizes up to four independent, low-jitter output frequencies from a single reference input. Its MultiSynth™ technology enables precise any-frequency generation (0.16–710 MHz) with 0 ppm error, making it ideal for replacing multiple crystal oscillators in PCIe, Ethernet, and FPGA-based systems. SI5338N-B05182-GMR integrates PLL-based synthesis, configurable output drivers, and I²C control in one 4×4 mm QFN package.

Does the SI5338N-B05182-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338N-B05182-GMR meets PCIe Gen 4 Common Clock jitter specifications with ≤0.45 ps RMS (12 kHz–20 MHz) when configured per Skyworks' recommended settings, including PLL bandwidth of 2–5 MHz and CDR = 10 MHz. This compliance is verified using the Skyworks PCIe Clock Jitter Tool and aligns with PCI Express Base Specification 4.0 rev. 0.5. SI5338N-B05182-GMR also satisfies Gen 1–3 requirements and SRNS mode for Gen 3.

Can the SI5338N-B05182-GMR generate different output formats simultaneously?

Yes, the SI5338N-B05182-GMR supports simultaneous LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL outputs - each independently configurable per channel via register settings. For example, CLK0A/B can drive LVDS at 156.25 MHz while CLK2A/B outputs HCSL at 100 MHz and CLK3 drives CMOS at 50 MHz - all with separate VDDOx supply rails (1.5/1.8/2.5/3.3 V). SI5338N-B05182-GMR's output stage allows full format and voltage mixing without external components.

How is the SI5338N-B05182-GMR programmed and configured?

The SI5338N-B05182-GMR is programmed via its I²C/SMBus-compatible 2-wire serial interface (SCL/SDA pins), supporting standard 100 kHz and 400 kHz modes. Configuration is simplified using Skyworks' ClockBuilder Pro software, which generates custom .cmb files and register maps based on user-defined frequency, format, and jitter targets. SI5338N-B05182-GMR also supports pin-controlled frequency increment/decrement and hardware reset for field updates without host processor involvement.

What thermal and power specifications apply to the SI5338N-B05182-GMR?

The SI5338N-B05182-GMR operates across –40 to +85 °C with a maximum junction temperature of 150 °C and thermal resistance θJA = 37 °C/W (still air). Core supply current is 45 mA typical at 100 MHz on all outputs with a 25 MHz reference; output buffer current varies by format and frequency (e.g., 30 mA max for LVPECL at 710 MHz). SI5338N-B05182-GMR uses a single 1.8/2.5/3.3 V core supply and supports independent 1.4–3.63 V VDDOx rails for output drivers.