Skyworks Solutions Inc. SI5338A-B01223-GMR

Overview

SI5338A-B01223-GMR from Skyworks Solutions is an I²C-programmable quad clock generator IC 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 Ethernet switch/router, PCIe, and FPGA clocking systems.

For engineers reviewing the SI5338A-B01223-GMR datasheet, SI5338A-B01223-GMR pinout, SI5338A-B01223-GMR application, or SI5338A-B01223-GMR equivalent, key selection considerations include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage support (1.5/1.8/2.5/3.3 V), flexible reference inputs (crystal, CMOS, SSTL, differential), and I²C/SMBus programmability.

Technical Context

The SI5338A-B01223-GMR integrates a high-stability PLL-based synthesis stage followed by four independent MultiSynth™ fractional-N dividers, enabling true zero-ppm frequency accuracy on all outputs. Its architecture supports both free-running clock generation and synchronous frequency translation modes.

Each output driver is fully decoupled-supporting LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats with independent supply rails (VDDO0–VDDO3) and programmable phase/frequency increment/decrement (20 ps / 1 ppm resolution). The device includes loss-of-lock and loss-of-signal alarms, external feedback for zero-delay mode, and spread-spectrum control (0.5–5.0% spread, 33–63 kHz modulation).

Key Specifications

Pinout & Package

SI5338A-B01223-GMR is housed in a 24-lead, 4 × 4 mm QFN package with exposed thermal pad (RoHS-compliant, halogen-free). Pin assignments are fixed per Skyworks Si5338 family layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5338A-B01223-GMR, Si5338A-B01222-GM offers identical hardware functionality with factory-tuned defaults, while LMK04832ISQE/NOPB provides superior jitter cleaning at the cost of increased complexity, size, and lack of SSC-making SI5338A-B01223-GMR optimal for cost-sensitive, space-constrained PCIe/Ethernet designs requiring flexible programmability.

Availability

SI5338A-B01223-GMR is available at Aetrix Electronics and suitable for Ethernet switch/router timing, PCIe Gen 3/4 clocking, and FPGA processor clocking applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338A-B01223-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, with leadership in RF, timing, and power management ICs for infrastructure, automotive, and mobile markets.

The Si5338 family is engineered as a highly configurable, low-jitter clock generator platform targeting high-speed digital systems-including data center interconnects, telecom line cards, and broadcast equipment-where flexibility, precision, and small footprint are critical.

FAQ

What is the primary function of the SI5338A-B01223-GMR?

The SI5338A-B01223-GMR is an I²C-programmable quad clock generator IC that synthesizes up to four independent, any-frequency output clocks (0.16–710 MHz) with 0.7 ps RMS typical phase jitter. It serves as a replacement for multiple crystal oscillators in systems requiring precise, flexible timing-such as PCIe, Ethernet, and FPGA platforms-while supporting differential and single-ended output formats with independent voltage rails.

Does the SI5338A-B01223-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B01223-GMR meets PCIe Gen 4 Common Clock jitter specifications with ≤0.45 ps RMS (12 kHz–20 MHz) when configured per Skyworks' recommended settings-including PLL bandwidth of 2–4 MHz and CDR = 10 MHz. It is validated for 100 MHz HCSL outputs and supports the full Gen 4 Base Specification 4.0 rev. 0.5 timing compliance framework.

Can the SI5338A-B01223-GMR generate different output voltages simultaneously?

Yes, the SI5338A-B01223-GMR supports independent output supply rails (VDDO0–VDDO3), allowing simultaneous generation of LVPECL (3.3 V), LVDS (2.5 V), HCSL (1.8 V), and CMOS (1.5 V) outputs from a single device. Each output driver is isolated and configurable for its own voltage, enabling direct interfacing with mixed-voltage ASICs, FPGAs, and memory controllers without external level shifters.

How is the SI5338A-B01223-GMR programmed, and what tools are required?

The SI5338A-B01223-GMR is programmed via its I²C/SMBus interface using Skyworks' ClockBuilder Pro software, which provides GUI-based configuration, frequency planning, jitter analysis, and register file generation. The tool auto-generates .c files or I²C write sequences for integration into boot firmware. No external hardware programmer is needed-only a standard I²C host controller and the ClockBuilder Pro license (free download from skyworksinc.com).

What reference inputs does the SI5338A-B01223-GMR accept?

The SI5338A-B01223-GMR accepts five reference input types: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL (5–350 MHz), HSTL (5–350 MHz), and differential (5–710 MHz). Input pins IN1/IN2 and IN5/IN6 support differential signals with internal termination options; IN3/IN4 support single-ended inputs with programmable thresholds. All inputs feed into a common PLL stage before MultiSynth™ division.