Skyworks Solutions Inc. SI5338A-B05144-GMR

Overview

SI5338A-B05144-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 from 1.8/2.5/3.3 V core supply in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in FPGA clocking, PCIe timing, and broadcast video systems.

For engineers reviewing the SI5338A-B05144-GMR datasheet, SI5338A-B05144-GMR pinout, SI5338A-B05144-GMR application, or SI5338A-B05144-GMR equivalent, key selection criteria include output format flexibility (LVPECL/LVDS/HCSL/CMOS/SSTL), independent per-output voltage (1.5–3.3 V), any-frequency synthesis down to 0.16 MHz, spread-spectrum control, and loss-of-lock/loss-of-signal monitoring.

Technical Context

The SI5338A-B05144-GMR implements a two-stage PLL architecture: a high-stability integer-N PLL for reference conditioning followed by four independent MultiSynth™ fractional-N synthesis blocks, each driving a configurable output stage. This enables true zero-ppm frequency accuracy across all outputs without requiring external loop filters or VCOs.

Each output supports independent format selection (LVPECL up to 710 MHz, LVDS up to 350 MHz, HCSL up to 250 MHz, CMOS up to 200 MHz), independent supply voltage (VDDOx = 1.5/1.8/2.5/3.3 V), and independent phase/frequency increment/decrement control with <20 ps step resolution and glitchless 1 ppm frequency adjustment.

Key Specifications

Pinout & Package

The SI5338A-B05144-GMR is housed in 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 and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B05145-GMR, SI5338A-B05144-GMR offers identical performance but different factory defaults-enabling faster bring-up in PCIe Gen 4 designs. Versus LMK04832ISQE/NOPB, SI5338A-B05144-GMR delivers lower power and smaller footprint at the cost of deterministic latency control, making it optimal for space-constrained industrial and telecom timing applications.

Availability

SI5338A-B05144-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 timing, FPGA clock distribution, broadcast video synchronization, and telecom line card applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for SI5338A-B05144-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 was designed to replace multiple discrete oscillators and clock buffers in high-performance digital systems, delivering programmable, low-jitter timing with minimal PCB footprint and simplified system-level clock tree design.

FAQ

What is the maximum output frequency supported by SI5338A-B05144-GMR in LVPECL format?

The SI5338A-B05144-GMR supports LVPECL outputs up to 710 MHz. This capability is confirmed in Table 6 of the official Skyworks datasheet (Rev. 1.6, p.8), which specifies "LVPECL: 0.16–710 MHz" under Output Clocks (Differential). Operation above 350 MHz requires use of Fvco/4 or Fvco/6 synthesis modes, with only two unique frequencies >350 MHz simultaneously allowed.

Does SI5338A-B05144-GMR support PCIe Gen 4 Common Clock compliance?

Yes, SI5338A-B05144-GMR meets PCIe Gen 4 Common Clock RMS jitter specifications (≤0.45 ps, 10 kHz–50 MHz) as verified in Table 12 of the Skyworks datasheet (Rev. 1.6, p.13). The device achieves this using its optimized PLL bandwidth (2–4 MHz or 2–5 MHz) and low-noise MultiSynth™ synthesis engine, with test conditions matching Intel's PCIe Base Specification 4.0 rev. 0.5.

Can SI5338A-B05144-GMR generate different output voltages on each channel?

Yes, SI5338A-B05144-GMR provides independent output buffer supplies (VDDO0–VDDO3), allowing each of its four output banks to be powered at 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This enables direct interface to mixed-voltage devices-for example, driving LVDS outputs at 1.8 V while supplying CMOS outputs at 3.3 V-without external level shifters.

How is the SI5338A-B05144-GMR configured during system startup?

The SI5338A-B05144-GMR boots from factory-programmed one-time programmable (OTP) memory containing user-defined configuration. After power-on reset, it begins generating clocks within 2 ms (tRDY, Table 5, p.6). Full I²C reprogramming is optional and supported via SCL/SDA pins; ClockBuilder Pro software simplifies custom configuration and validation.

What package type and thermal characteristics does SI5338A-B05144-GMR use?

SI5338A-B05144-GMR uses a 24-lead QFN package measuring 4 × 4 mm with 0.5 mm pitch and an exposed thermal pad. Its thermal resistance is θJA = 37 °C/W (still air) and θJC = 10 °C/W (Table 4, p.5), enabling reliable operation at full load across –40 °C to +85 °C ambient without forced airflow in typical industrial PCB layouts.