Skyworks Solutions Inc. SI5334A-B10521-GMR

Overview

SI5334A-B10521-GMR from Skyworks Solutions is a pin-controlled, quad-output any-frequency clock generator with four independently configurable differential clock outputs. It synthesizes frequencies from 0.16 MHz to 710 MHz using MultiSynth fractional-N synthesis, delivers 0.7 ps RMS typical phase jitter, supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL output formats, and operates from 1.8/2.5/3.3 V core and per-output supply voltages - deployed in PCIe 3.0 timing, FPGA clocking, and broadcast video systems.

For engineers reviewing the SI5334A-B10521-GMR datasheet, SI5334A-B10521-GMR pinout, SI5334A-B10521-GMR application, or SI5334A-B10521-GMR equivalent, key selection considerations include its 4× differential output flexibility, factory-programmed zero-ppm accuracy, 20 ps phase step resolution, spread-spectrum capability on 100 MHz outputs, and compatibility with crystal (8–30 MHz) or wide-range differential inputs (5–710 MHz).

Technical Context

The SI5334A-B10521-GMR integrates a fully on-chip fractional-N PLL with VCO, loop filter, and four independent MultiSynth output dividers enabling non-integer frequency synthesis on each of its four differential outputs. Its input stage accepts either an 8–30 MHz crystal or AC-coupled differential clock (5–710 MHz), DC-coupled CMOS (5–200 MHz), or SSTL/HSTL (5–350 MHz) references.

Each output driver supports independent voltage selection (1.5/1.8/2.5/3.3 V), format selection (LVPECL up to 710 MHz, LVDS up to 350 MHz, HCSL up to 250 MHz, CMOS up to 200 MHz), and features pin-controlled phase increment/decrement (±45 ns range, 20 ps steps) and frequency increment/decrement (1 ppm steps, glitchless, on CLK0A/B only).

Key Specifications

Pinout & Package

SI5334A-B10521-GMR is housed in a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per the Si5334 family pinout and confirmed for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D08589-GM, SI5334A-B10521-GMR offers simpler pin-control operation and smaller footprint but lacks I²C configurability; compared with ICS853S01AGI-01LFT, it provides full any-frequency synthesis and jitter-critical features essential for PCIe 3.0 and broadcast video - making it the only option meeting both zero-ppm accuracy and sub-1 ps RMS jitter requirements.

Availability

SI5334A-B10521-GMR is available at Aetrix Electronics and suitable for PCIe 3.0 timing, FPGA clock distribution, and broadcast video applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5334A-B10521-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 solutions for communications, automotive, and industrial markets.

The SI5334A-B10521-GMR belongs to Skyworks' Si533x family of pin-controlled, any-frequency clock generators designed for high-reliability, low-jitter timing in infrastructure equipment where programmability, small size, and deterministic behavior are critical.

FAQ

What is the maximum output frequency supported by SI5334A-B10521-GMR?

The SI5334A-B10521-GMR supports up to 710 MHz on LVPECL outputs, 350 MHz on LVDS/SSTL/HSTL, 250 MHz on HCSL, and 200 MHz on CMOS. These limits are format-dependent and verified per Table 4 in the datasheet; operation above Fvco/8 (350 MHz) requires integer-related frequencies and specific MultiSynth configurations.

Does SI5334A-B10521-GMR require external configuration hardware or software?

No - SI5334A-B10521-GMR is factory-programmed with a fixed configuration stored in one-time-programmable (OTP) memory. It powers up and begins generating clocks immediately without I²C, SPI, or host processor intervention. Pin strapping (e.g., OEB, LOSLOL) provides real-time control, eliminating need for configuration firmware.

Can SI5334A-B10521-GMR generate different output formats simultaneously?

Yes - SI5334A-B10521-GMR supports mixed output formats: for example, CLK0A/B as LVPECL, CLK1A/B as LVDS, CLK2A/B as HCSL, and CLK3A/B as CMOS. Each output pair has its own VDDO pin and format-select capability, enabling true heterogeneous clock distribution from a single device.

Is spread spectrum clocking (SSC) supported on all outputs of SI5334A-B10521-GMR?

Spread spectrum is supported only on outputs configured to 100 MHz with Rn divider = 1, per datasheet Table 3 Note 4. It is PCIe 2.0 compliant (±0.5% deviation, 30–33 kHz rate) and cannot be enabled on other frequencies or in zero-delay mode without violating specification limits.

What is the power supply requirement for SI5334A-B10521-GMR core and outputs?

The SI5334A-B10521-GMR requires a core supply (VDD) of 1.8 V (±10%), 2.5 V (±10%), or 3.3 V (±10%). Each output pair has dedicated VDDOx pins supporting 1.5 V, 1.8 V, 2.5 V, or 3.3 V - allowing mixed-voltage operation across outputs without level-shifting components.