Skyworks Solutions Inc. SI5338J-B05415-GMR

Overview

SI5338J-B05415-GMR 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 in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338J-B05415-GMR datasheet, SI5338J-B05415-GMR pinout, SI5338J-B05415-GMR application, or SI5338J-B05415-GMR equivalent, key selection criteria include output format flexibility (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL), independent per-output voltage (1.5–3.3 V), any-frequency synthesis capability (0.16–710 MHz), spread-spectrum control, and PCIe Gen 4 jitter compliance.

Technical Context

The SI5338J-B05415-GMR implements a two-stage PLL architecture with a high-frequency VCO and patented MultiSynth™ fractional-N synthesis per output channel, enabling independent frequency, phase, and spread-spectrum configuration without shared dividers. Its input stage supports eight reference sources: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz).

Each of the four output drivers features independent supply voltage (VDDO0–VDDO3), programmable signal format, 1 ppm frequency increment/decrement steps, <20 ps phase adjustment resolution, and loss-of-lock/loss-of-signal monitoring. The device operates from a single 1.8/2.5/3.3 V core supply with 45 mA typical current draw.

Key Specifications

Pinout & Package

SI5338J-B05415-GMR is housed in a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 is top-left corner (IN1), and pin numbering follows counter-clockwise orientation. The package supports standard PCB assembly and provides low-inductance ground and power connections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05415-GM and ICS8430I-01T, SI5338J-B05415-GMR uniquely balances full I²C programmability, wide frequency range (0.16–710 MHz), spread-spectrum control, and PCIe Gen 4 compliance - making it optimal for adaptive, multi-standard timing in programmable systems.

Availability

SI5338J-B05415-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, 10GbE PHY clocking, broadcast video routing, and telecom line card synchronization requiring stable component supply across extended temperature and long production lifecycles.

Supply support for SI5338J-B05415-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 precision analog components for infrastructure, automotive, and mobile markets.

The Si5338 family was designed as a programmable, low-jitter quad clock generator targeting high-speed serial interface timing in networking, computing, and broadcast equipment - emphasizing flexibility, integration, and compliance with PCIe, Ethernet, and SONET standards.

FAQ

What is the maximum output frequency supported by SI5338J-B05415-GMR?

The SI5338J-B05415-GMR supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, and 250 MHz on HCSL. For frequencies above 350 MHz, only two unique outputs may operate simultaneously at Fvco/4 and Fvco/6 rates. All outputs maintain 0.7 ps RMS typical jitter within their respective rated ranges, verified per JEDEC 65 and PCIe Gen 4 specifications.

Does SI5338J-B05415-GMR support PCIe Gen 4 Common Clock compliance?

Yes, SI5338J-B05415-GMR is explicitly specified for PCIe Gen 4 Common Clock compliance with 0.15–0.45 ps RMS jitter (10 kHz–50 MHz) under defined test conditions (100 MHz HCSL outputs, PLL BW 2–5 MHz, CDR = 10 MHz). This is validated in Table 12 of the official Skyworks datasheet Rev. 1.6 and confirmed using the Skyworks PCIe Clock Jitter Tool.

Can SI5338J-B05415-GMR generate different output voltages on each channel?

Yes, SI5338J-B05415-GMR provides independent VDDO0–VDDO3 supplies, allowing each of its four output banks to be set to 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This enables direct interfacing with mixed-voltage devices - for example, driving 1.8 V FPGA I/O banks and 3.3 V legacy SerDes simultaneously - without external level shifters or LDOs.

How is SI5338J-B05415-GMR programmed, and is external non-volatile memory required?

SI5338J-B05415-GMR is programmed via its I²C/SMBus interface using Skyworks' ClockBuilder Pro software. Configuration is stored in on-chip one-time-programmable (OTP) NVM, so no external memory is needed. Factory-programmed units power up with valid clocks immediately; field updates are supported via I²C without requiring reflow or hardware changes.

What reference inputs does SI5338J-B05415-GMR accept?

SI5338J-B05415-GMR accepts eight reference types: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL (5–350 MHz), HSTL (5–350 MHz), and differential (5–710 MHz) on pins IN1/IN2, IN5/IN6. Input configurations are fully programmable, and the device includes automatic loss-of-signal detection with 2.6–5 µs response time.