Skyworks Solutions Inc. SI5338M-B05693-GM

Overview

SI5338M-B05693-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. It replaces up to four crystal oscillators in high-speed serial interface timing applications such as PCIe root complexes and FPGA clock trees.

For engineers reviewing the SI5338M-B05693-GM datasheet, SI5338M-B05693-GM pinout, SI5338M-B05693-GM application, or SI5338M-B05693-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 24-QFN package compatibility with space-constrained PCB layouts.

Technical Context

The SI5338M-B05693-GM implements a two-stage PLL architecture: a high-stability integer-N PLL (Stage 1) locks to one of six input references (crystal, CMOS, SSTL/HSTL, or differential), followed by four independent MultiSynth™ fractional-N synthesizers (Stage 2) generating precise output frequencies. Each output driver supports format selection (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL) and programmable slew rate control.

It features loss-of-lock and loss-of-signal monitoring, independent phase/frequency increment/decrement (20 ps / 1 ppm steps), external feedback for zero-delay mode, and I²C/SMBus-compatible configuration via 24-bit address space. The device uses on-chip OTP NVM for factory programming and supports dynamic reconfiguration without reset.

Key Specifications

Pinout & Package

SI5338M-B05693-GM is housed in a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per Si5338 family specification 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-D05693-GM and ICS8430I-01T, the SI5338M-B05693-GM offers optimal balance of programmability, jitter performance, and industrial temperature range - enabling field-upgradable timing in PCIe, Ethernet, and FPGA platforms without redesigning clock circuitry.

Availability

SI5338M-B05693-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 root complexes, 10 GbE switch timing, and FPGA-based broadcast video equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SI5338M-B05693-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 power management ICs for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed for high-performance, software-configurable clock generation in data center, networking, and broadcast systems where multi-frequency synthesis, low jitter, and flexible output formatting are critical.

FAQ

What is the maximum output frequency supported by the SI5338M-B05693-GM in LVPECL mode?

The SI5338M-B05693-GM supports LVPECL outputs up to 710 MHz, as confirmed in Table 6 of the datasheet. This applies when using the MultiSynth™ synthesizer in integer mode with appropriate VCO settings and load conditions. Operation above 350 MHz requires careful attention to layout and termination to maintain jitter performance below 1 ps RMS.

Does the SI5338M-B05693-GM support PCIe Gen 4 Separate Reference No Spread (SRNS) timing?

Yes, the SI5338M-B05693-GM is explicitly compliant with PCIe Gen 4 SRNS requirements, achieving 0.15–0.45 ps RMS jitter (Table 12) under specified conditions: PLL bandwidth of 2–4 MHz or 2–5 MHz and CDR = 10 MHz. This compliance is verified using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4.

Can the SI5338M-B05693-GM generate different output voltages simultaneously on its four drivers?

Yes, the SI5338M-B05693-GM provides independent VDDO0–VDDO3 supply pins, allowing each of its four output drivers to operate at different voltages-1.5 V, 1.8 V, 2.5 V, or 3.3 V-within the 1.4–3.63 V range. This enables direct interfacing to mixed-voltage devices like multi-rail FPGAs or heterogeneous SoCs without external level shifters.

How is the SI5338M-B05693-GM programmed, and is ClockBuilder Pro required?

The SI5338M-B05693-GM is programmed via its I²C/SMBus interface using register writes. While ClockBuilder Pro is the official Skyworks GUI tool for configuration and .hex file generation, direct register-level programming is fully supported. The device includes on-chip OTP NVM for storing factory configurations, and all registers are accessible for runtime updates without reset.

What is the thermal resistance (θJA) of the SI5338M-B05693-GM in its 24-QFN package?

The SI5338M-B05693-GM has a junction-to-ambient thermal resistance (θJA) of 37 °C/W under still-air conditions, as specified in Table 4 of the datasheet. This value assumes proper PCB layout with the exposed thermal pad soldered to a minimum 100 mm² copper pour connected to internal ground planes for effective heat dissipation.