Skyworks Solutions Inc. SI5338H-B04836-GM

Overview

SI5338H-B04836-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis. It delivers four independent, any-frequency outputs (0.16–710 MHz), supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, achieves 0.7 ps RMS phase jitter (typ), and operates from 1.8/2.5/3.3 V core supply in PCIe Gen 1–4 timing-critical applications.

For engineers reviewing the SI5338H-B04836-GM datasheet, SI5338H-B04836-GM pinout, SI5338H-B04836-GM application, or SI5338H-B04836-GM equivalent, key selection criteria include PCIe SRNS compliance, independent per-output voltage control (1.5–3.3 V), programmable phase/frequency adjustment (±45 ns / 1 ppm steps), and 24-pin 4×4 mm QFN package compatibility with high-density FPGA/ASIC clocking layouts.

Technical Context

The SI5338H-B04836-GM implements a two-stage PLL architecture: a high-stability input stage locking to external crystal (8–30 MHz) or differential/CMOS references (5–710 MHz), followed by four independent MultiSynth™ fractional-N synthesizers. Each output path includes configurable divider chains (R/M/N/P), enabling zero-ppm accuracy across all four clocks without shared dividers.

Its output stage provides per-driver voltage selection (1.5/1.8/2.5/3.3 V), format flexibility (LVPECL up to 710 MHz, HCSL up to 250 MHz, CMOS up to 200 MHz), and hardware-controlled features including loss-of-lock/loss-of-signal alarms, spread-spectrum modulation (0.5–5.0% at 33–63 kHz), and glitchless frequency increment/decrement via dedicated pins.

Key Specifications

Pinout & Package

The SI5338H-B04836-GM uses a 24-pin QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 is top-left corner (IN1), pin 24 is bottom-right (GND). All power and ground pins are distributed for low-noise operation and thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D06989-GM and ICS8430I-01LG, the SI5338H-B04836-GM balances programmability, jitter performance, and footprint-offering full I²C configurability and PCIe Gen 4 readiness in a compact 4×4 mm QFN, while avoiding the premium cost and complexity of higher-tier timing ICs.

Availability

SI5338H-B04836-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switch clocking, broadcast video sync, and FPGA-based video processing requiring stable component supply and long-term industrial availability.

Supply support for SI5338H-B04836-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 products.

The Si5338 family is designed for high-performance, multi-output clock generation in datacenter, telecom, and broadcast systems where flexible frequency synthesis, low jitter, and small footprint are critical.

FAQ

What is the maximum output frequency supported by the SI5338H-B04836-GM in LVPECL format?

The SI5338H-B04836-GM supports LVPECL outputs up to 710 MHz. This is confirmed in Table 6 of the datasheet under "Output Clocks (Differential)" for LVPECL/LVDS/CML. Operation above 350 MHz requires use of Fvco/4 or Fvco/6 synthesis paths, and only two unique frequencies >350 MHz may be active simultaneously.

Does the SI5338H-B04836-GM support PCIe Gen 4 Common Clock compliance?

Yes, the SI5338H-B04836-GM meets PCIe Gen 4 Common Clock jitter requirements with ≤0.45 ps RMS (10 kHz–50 MHz), as specified in Table 12. It also satisfies PCIe Gen 3 Separate Reference No Spread (SRNS) at ≤0.32 ps RMS, making it suitable for both legacy and next-generation server and accelerator timing.

Can the SI5338H-B04836-GM generate different output voltages on each of its four drivers?

Yes - the SI5338H-B04836-GM provides independent VDDO0 through VDDO3 pins, allowing each output pair to be powered at 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This enables mixed-voltage clock distribution to diverse loads (e.g., 1.8 V SerDes, 2.5 V processors, 3.3 V legacy peripherals) without external level shifters.

How is the SI5338H-B04836-GM programmed, and is ClockBuilder Pro required?

The SI5338H-B04836-GM is programmed via its I²C/SMBus interface (SCL/SDA pins). While ClockBuilder Pro software simplifies configuration and validation, direct register writes are fully supported. The device includes factory-programmed OTP NVM, so configuration persists after power cycle without external memory.

What is the thermal performance of the SI5338H-B04836-GM in continuous operation?

The SI5338H-B04836-GM has a junction-to-ambient thermal resistance (θJA) of 37 °C/W in still air, and junction-to-case (θJC) of 10 °C/W. With typical core current of 45 mA at 100 MHz outputs, power dissipation remains low (~150 mW), enabling reliable operation in sealed industrial enclosures without forced airflow.