Skyworks Solutions Inc. SI5338A-B02498-GMR

Overview

SI5338A-B02498-GMR 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 formats. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338A-B02498-GMR datasheet, SI5338A-B02498-GMR pinout, SI5338A-B02498-GMR application, or SI5338A-B02498-GMR equivalent, key selection criteria include differential output jitter performance at 125 MHz (0.7 ps RMS), PCIe Gen 4 common clock compliance, independent per-output voltage control (1.5–3.3 V), and 24-pin 4×4 mm QFN package compatibility with space-constrained FPGA/ASIC clock trees.

Technical Context

The SI5338A-B02498-GMR implements a two-stage PLL architecture: a high-stability input stage with programmable R-divider followed by four independent MultiSynth™ fractional-N synthesis blocks, each feeding a configurable output driver. Each output supports integer or fractional mode operation with <20 ps programmable phase step resolution and 1 ppm frequency increment/decrement capability.

It accepts multiple reference inputs - external 8–30 MHz crystal, CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz) - and provides loss-of-lock and loss-of-signal alarms. The device operates from a single 1.8/2.5/3.3 V core supply and supports spread-spectrum clocking (0.5–5.0% spread, 33–63 kHz modulation rate) on any output.

Key Specifications

Pinout & Package

SI5338A-B02498-GMR is housed in a 24-lead, 4 mm × 4 mm QFN package with wettable flanks and an exposed thermal pad. Pin 1 is located at top-left corner (IN1), with pins numbered counter-clockwise. The package supports reflow soldering per JEDEC J-STD-020 (peak 260 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B02500-GMR, SI5338A-B02498-GMR offers full field programmability via I²C and ClockBuilder Pro, while LM K04832 provides lower jitter at the cost of fixed dual-PLL architecture and no per-output voltage scaling - making SI5338A-B02498-GMR optimal for flexible, space-constrained multi-interface timing.

Availability

SI5338A-B02498-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switch clocking, and FPGA/ASIC clock tree applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338A-B02498-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 connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 family was designed specifically for high-density, multi-protocol timing in networking, computing, and broadcast systems - enabling consolidation of discrete oscillators into a single, software-defined clock source with PCIe, Ethernet, and video standard compliance.

FAQ

What is the primary function of the SI5338A-B02498-GMR?

The SI5338A-B02498-GMR is a quad-output, I²C-programmable clock generator using Skyworks' MultiSynth™ technology to synthesize any frequency from 0.16 to 710 MHz on each output. It serves as a replacement for up to four discrete crystal oscillators in systems requiring precise, low-jitter timing across multiple interfaces such as PCIe, Ethernet, and FPGA clock domains. Its design eliminates the need for external crystals per output while maintaining 0.7 ps RMS jitter performance.

Does the SI5338A-B02498-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B02498-GMR meets PCIe Gen 4 Common Clock specifications with ≤0.45 ps RMS jitter (12 kHz–20 MHz) and ≤33.6 ps pk-pk total jitter when configured for 100 MHz HCSL outputs. It is validated per PCI Express Base Specification 4.0 rev. 0.5 and supports both Common Clock and Gen 3 SRNS modes. Jitter measurements are performed using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4.

How many independent output voltage rails does the SI5338A-B02498-GMR support?

The SI5338A-B02498-GMR supports four independent output buffer supply rails - VDDO0 through VDDO3 - each configurable from 1.4 V to 3.63 V. This enables mixed-signal clock distribution, such as driving LVDS (2.5 V) and HCSL (1.8 V) outputs simultaneously from a single SI5338A-B02498-GMR device without external level shifters, simplifying power delivery in multi-standard systems.

Can the SI5338A-B02498-GMR generate frequencies above 350 MHz?

Yes, the SI5338A-B02498-GMR supports frequencies up to 710 MHz on differential outputs, but only two unique frequencies above 350 MHz may be generated simultaneously - specifically at Fvco/4 and Fvco/6 - due to internal VCO constraints. Frequencies between 350–473.33 MHz and 550–710 MHz are supported, while 473.33–550 MHz is a gap region. This limitation is documented in Section 3.3 of the datasheet.

What programming interface does the SI5338A-B02498-GMR use?

The SI5338A-B02498-GMR uses an I²C/SMBus-compatible serial interface (SCL/SDA pins) operating at 100 kHz or 400 kHz. Configuration is simplified using Skyworks' ClockBuilder Pro software, which generates register maps and configuration files. The device also supports pin-controlled frequency/phase adjustments (PINC/FDEC/OEB) for real-time dynamic tuning without host processor intervention.