Skyworks Solutions Inc. SI5338M-B04914-GM

Overview

SI5338M-B04914-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) with 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL output formats. It serves as a drop-in replacement for up to four crystal oscillators in high-speed serial interface timing.

For engineers reviewing the SI5338M-B04914-GM datasheet, SI5338M-B04914-GM pinout, SI5338M-B04914-GM application, or SI5338M-B04914-GM equivalent, key selection criteria include differential output jitter performance at 125 MHz (0.7 ps RMS), PCIe Gen 4 common-clock RMS jitter (0.15–0.45 ps), independent per-output voltage control (1.5/1.8/2.5/3.3 V), and 24-QFN package compatibility with PCB land pattern per JEDEC MO-220.

Technical Context

The SI5338M-B04914-GM implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesis blocks. Each output path includes programmable divider chains (R, P, M), configurable output drivers, and per-channel phase/frequency increment/decrement control with <20 ps step accuracy.

It supports flexible reference inputs - external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz) - and enables zero-delay mode via external feedback. Loss-of-lock and loss-of-signal alarms provide real-time status monitoring over the I²C/SMBus interface.

Key Specifications

Pinout & Package

SI5338M-B04914-GM uses a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with an exposed thermal pad. Pin assignments are fixed per Skyworks Si5338 family layout and validated for signal integrity in high-speed clock distribution.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D06889-GM and ICS8430I-01T, the SI5338M-B04914-GM uniquely balances field-programmability, PCIe Gen 4 compliance, and 24-QFN footprint - making it optimal for space-constrained, multi-standard platforms requiring post-silicon clock tuning.

Availability

SI5338M-B04914-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet routing, broadcast video synchronization, and FPGA-based video processing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338M-B04914-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 leader in analog semiconductors, specializing in RF, mobile, infrastructure, and timing solutions with over 30 years of RF and precision clock innovation.

The Si5338 product line was engineered for high-speed serial interface timing in datacenter, telecom, and broadcast equipment - delivering programmable, low-jitter clock synthesis in compact QFN packages for PCIe, Ethernet, and video applications.

FAQ

What is the maximum output frequency supported by the SI5338M-B04914-GM?

The SI5338M-B04914-GM supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, 250 MHz on HCSL, and 200 MHz on CMOS. Frequencies above 350 MHz are limited to two unique values simultaneously (Fvco/4 and Fvco/6) due to VCO architecture constraints. All outputs maintain ≤0.7 ps RMS jitter at 125 MHz per Skyworks characterization.

Does the SI5338M-B04914-GM support PCIe Gen 4 Common Clock compliance?

Yes, the SI5338M-B04914-GM meets PCIe Gen 4 Common Clock RMS jitter specifications (0.15–0.45 ps) when configured with PLL bandwidth of 2–5 MHz and CDR = 10 MHz. This compliance is verified per PCI Express Base Specification 4.0 rev. 0.5 and confirmed using the Skyworks PCIe Clock Jitter Tool.

Can the SI5338M-B04914-GM generate different output voltages on each channel?

Yes - the SI5338M-B04914-GM provides independent VDDO0 through VDDO3 supplies, each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This enables direct interfacing with mixed-voltage SerDes, FPGA I/O banks, and memory controllers without external level shifters.

How is the SI5338M-B04914-GM programmed in-system?

The SI5338M-B04914-GM is programmed via its I²C/SMBus interface (SCL/SDA pins) using Skyworks' ClockBuilder Pro software. Configuration can be stored in on-chip OTP NVM for power-on initialization, or dynamically updated during operation for frequency/phase tuning without reset.

What reference inputs does the SI5338M-B04914-GM accept?

The SI5338M-B04914-GM accepts eight reference sources: differential (IN1/IN2, IN5/IN6, 5–710 MHz), single-ended CMOS (IN3/IN4, 5–200 MHz), SSTL/HSTL (5–350 MHz), and external crystal (8–30 MHz). Input flexibility enables use with XO, XO-buffered, or high-speed differential sources.