Skyworks Solutions Inc. SI5338N-B05552-GMR

Overview

SI5338N-B05552-GMR from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis. It delivers four independent, any-frequency clocks (0.16–710 MHz) with 0.7 ps RMS phase jitter, PCIe Gen 1–4 compliance, and configurable LVPECL/LVDS/HCSL/CMOS outputs. It replaces up to four crystal oscillators in high-speed networking and FPGA timing applications.

For engineers reviewing the SI5338N-B05552-GMR datasheet, SI5338N-B05552-GMR pinout, SI5338N-B05552-GMR application, or SI5338N-B05552-GMR equivalent, key selection factors include differential output jitter performance, I²C programmability for dynamic frequency adjustment, PCIe SRNS compliance, and support for multiple input references (crystal, CMOS, differential).

Technical Context

The SI5338N-B05552-GMR implements a two-stage PLL architecture: a high-stability reference PLL (Stage 1) locks to an external crystal or clock, followed by four independent MultiSynth™ fractional-N synthesizers (Stage 2) generating each output. Each output supports independent format (LVPECL/LVDS/HCSL/CMOS), voltage (1.5–3.3 V), and spread-spectrum modulation (0.5–5.0%, 33–63 kHz).

It features pin-controlled frequency/phase increment/decrement (1 ppm / 20 ps steps), loss-of-lock and loss-of-signal alarms, and zero-delay mode via external feedback. The device operates across –40 to +85 °C with core supply options of 1.8 V, 2.5 V, or 3.3 V and typical core current of 45 mA at 100 MHz on all outputs.

Key Specifications

Pinout & Package

SI5338N-B05552-GMR is housed in a 24-lead, 4 mm × 4 mm QFN package with exposed thermal pad (RoHS-compliant, halogen-free). Pin 1 is top-left corner (IN1), pin 24 is bottom-right (GND), and pin 13 is center-bottom (CLK3B). Package outline conforms to JEDEC MO-220.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05552-GM and ICS853S02AGT, SI5338N-B05552-GMR uniquely balances field-programmability, multi-reference input flexibility, and PCIe Gen 4 jitter performance-making it optimal for next-generation adaptive timing architectures.

Availability

SI5338N-B05552-GMR is available at Aetrix Electronics and suitable for Ethernet switch/router, PCIe Gen 4 server platforms, broadcast video timing, and telecom line card applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338N-B05552-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed specifically for high-performance, software-configurable clock generation in datacenter, networking, and broadcast equipment-enabling consolidation of multiple timing sources into a single, programmable IC.

FAQ

What input reference frequencies does the SI5338N-B05552-GMR support?

The SI5338N-B05552-GMR supports crystal inputs from 8 to 30 MHz, single-ended CMOS clocks from 5 to 200 MHz, SSTL/HSTL inputs from 5 to 350 MHz, and differential inputs from 5 to 710 MHz. All inputs are validated across the full –40 to +85 °C operating range, and the device includes loss-of-signal detection with 2.6–5 µs response time. SI5338N-B05552-GMR uses internal programmable load capacitance (11–13 pF) for crystal drive optimization.

Does the SI5338N-B05552-GMR meet PCIe Gen 4 timing requirements?

Yes, SI5338N-B05552-GMR meets PCIe Gen 4 common clock jitter specifications (0.15–0.45 ps RMS, 10 kHz–50 MHz) when configured with a 2–5 MHz PLL bandwidth and 100 MHz HCSL outputs. It also satisfies PCIe Gen 3 SRNS requirements (0.11–0.32 ps RMS) and has been validated using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4. SI5338N-B05552-GMR achieves this with its low-noise MultiSynth™ architecture and optimized loop filter design.

How is the SI5338N-B05552-GMR programmed and configured?

The SI5338N-B05552-GMR is programmed via its I²C/SMBus-compatible serial interface (SCL/SDA pins), supporting standard-mode (100 kHz) and fast-mode (400 kHz) operation. Configuration is simplified using Skyworks' ClockBuilder Pro software, which generates register maps, validates settings, and exports .c files for embedded initialization. SI5338N-B05552-GMR also supports pin-strapped startup modes and nonvolatile memory (OTP) for factory-programmed default configurations.

Can the SI5338N-B05552-GMR generate different output formats simultaneously?

Yes, SI5338N-B05552-GMR supports mixed output formats across its four differential pairs: for example, CLK0A/B as LVPECL (156.25 MHz), CLK1A/B as LVDS (100 MHz), CLK2A/B as HCSL (250 MHz), and CLK3A/B as CMOS (50 MHz). Each output bank (VDDO0–VDDO3) is independently powered (1.5/1.8/2.5/3.3 V), enabling direct interfacing with diverse logic families without level-shifting components. SI5338N-B05552-GMR's register-based format selection ensures deterministic behavior at power-up.

What thermal and power characteristics does the SI5338N-B05552-GMR exhibit?

SI5338N-B05552-GMR has a junction-to-ambient thermal resistance (θJA) of 37 °C/W and junction-to-case (θJC) of 10 °C/W in still air. Typical core supply current is 45 mA at 100 MHz on all outputs with a 25 MHz reference; buffer-only mode draws 12 mA. Power consumption scales linearly with output count and frequency-e.g., driving four 710 MHz LVPECL outputs increases IDDOx to ≤30 mA per channel. SI5338N-B05552-GMR maintains stable operation across –40 to +85 °C with no derating required.