Skyworks Solutions Inc. SI5338M-B04513-GMR

Overview

SI5338M-B04513-GMR from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis, delivering four independent low-jitter clocks (0.7 ps RMS typ) across LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, supporting PCIe Gen 1–4 and Ethernet switch timing in telecom line cards and FPGA-based systems.

For engineers reviewing the SI5338M-B04513-GMR datasheet, SI5338M-B04513-GMR pinout, SI5338M-B04513-GMR application, or SI5338M-B04513-GMR equivalent, key selection criteria include its 24-QFN package, 4× differential output capability, ±0.1 ppm synthesis accuracy, spread-spectrum control per output, and support for external crystal (8–30 MHz), CMOS (5–200 MHz), or differential (5–710 MHz) reference inputs.

Technical Context

The SI5338M-B04513-GMR implements a two-stage PLL architecture: a high-stability integer-N PLL (Stage 1) locks to the input reference, followed by four independent fractional-N MultiSynth™ synthesizers (Stage 2) generating outputs with true zero-ppm precision. Each output path includes programmable phase offset (<20 ps steps), frequency increment/decrement (1 ppm steps), and configurable spread-spectrum modulation (0.5–5.0% deviation, 33–63 kHz rate).

It supports flexible input routing - IN1/IN2 and IN5/IN6 accept differential clocks up to 710 MHz, while IN3/IN4 accept single-ended CMOS/SSTL/HSTL signals up to 350 MHz - and provides independent VDDO supplies (1.5/1.8/2.5/3.3 V) per output bank to match diverse load requirements without level-shifting circuitry.

Key Specifications

Pinout & Package

SI5338M-B04513-GMR uses a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with an exposed thermal pad. Pin assignments are fixed per the Si5338 family: pins 1–24 correspond to IN1, CLK2B, CLK2A, VDDO2, VDDO1, CLK1B, CLK1A, VDD, VDD, SCL, CLK3A, CLK3B, INTR, SDA, VDDO0, CLK0B, CLK0A, RSVD_GND, VDDO3, GND, GND, IN2, IN3, IN4 - with IN5/IN6 located on pins 23/24 per functional block diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D06513-GM and ICS853S01AGI-01LFT, SI5338M-B04513-GMR uniquely balances field-programmability, quad-output flexibility, and PCIe Gen 4 compliance in a compact 24-QFN footprint-making it optimal for mid-channel-count, reconfigurable timing in networking and compute platforms.

Availability

SI5338M-B04513-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 timing, Ethernet switch/router clocking, and FPGA/ASIC clock distribution requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338M-B04513-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 for wireless, broadband, automotive, and industrial markets.

The Si5338 product line delivers programmable, low-jitter clock generation for high-speed digital systems, targeting applications demanding precise frequency synthesis, multi-format output flexibility, and robust jitter performance in space-constrained designs.

FAQ

What reference clock inputs does the SI5338M-B04513-GMR support?

The SI5338M-B04513-GMR accepts multiple reference types: external crystal (8–30 MHz), single-ended CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz on IN1/IN2 and IN5/IN6). It also supports clock buffer mode (PLL bypass) for low-additive-jitter translation. All references are validated per Skyworks' electrical specifications in Rev. 1.6 datasheet.

Does the SI5338M-B04513-GMR support PCIe Gen 4 common clock compliance?

Yes, the SI5338M-B04513-GMR meets PCIe Gen 4 common clock jitter requirements with 0.15–0.45 ps RMS (1.5 MHz–50 MHz band) when configured per Skyworks' recommended settings-including PLL bandwidth of 2–4 MHz and CDR = 10 MHz. This is verified in Table 12 of the official datasheet Rev. 1.6.

How many independent output voltage supplies does the SI5338M-B04513-GMR provide?

The SI5338M-B04513-GMR provides four independent output buffer supply pins-VDDO0, VDDO1, VDDO2, and VDDO3-each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This enables direct interfacing with mixed-voltage components (e.g., 1.8 V FPGA I/O and 3.3 V legacy peripherals) without external level shifters.

Can the SI5338M-B04513-GMR generate frequencies above 350 MHz on all four outputs simultaneously?

No. The SI5338M-B04513-GMR supports only two unique frequencies above 350 MHz simultaneously-specifically Fvco/4 and Fvco/6-as stated in Note 6 of Table 6. Higher-frequency outputs must share these two synthesis paths; other outputs are limited to ≤350 MHz depending on format (e.g., HCSL ≤250 MHz, CMOS ≤200 MHz).

Is ClockBuilder Pro software required to configure the SI5338M-B04513-GMR?

ClockBuilder Pro is strongly recommended but not strictly required: it provides GUI-based configuration, real-time jitter estimation, and one-click register file generation for the SI5338M-B04513-GMR. However, manual I²C register writes are fully supported using the documented register map (Section 6 of datasheet Rev. 1.6), enabling custom firmware integration.