Skyworks Solutions Inc. SI5334A-B10521-GM

Overview

SI5334A-B10521-GM from Skyworks Solutions is a pin-controlled, any-frequency quad clock generator with four independently configurable differential outputs, supporting frequencies up to 350 MHz (and select outputs to 710 MHz), 0.7 ps RMS typical phase jitter, and zero ppm frequency error via MultiSynth synthesis. It operates from 1.8/2.5/3.3 V core supply and accepts 8–30 MHz crystal or 5–710 MHz differential/single-ended reference inputs. It is deployed in PCIe 3.0 timing, FPGA clocking, and broadcast video systems.

For engineers reviewing the SI5334A-B10521-GM datasheet, SI5334A-B10521-GM pinout, SI5334A-B10521-GM application, or SI5334A-B10521-GM equivalent, key selection considerations include per-output voltage configurability (1.5/1.8/2.5/3.3 V), independent format support (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL), glitchless 1 ppm frequency increment/decrement on CLK0A/B, and loss-of-signal/loss-of-lock monitoring.

Technical Context

The SI5334A-B10521-GM integrates a fractional-N PLL with on-chip VCO and four independent MultiSynth output dividers, enabling non-integer frequency synthesis on each of its four differential outputs. Its input stage supports crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz) references.

Each output driver features independent supply voltage selection (VDDOx = 1.5/1.8/2.5/3.3 V), programmable initial phase offset (±45 ns), and 20 ps phase step resolution. The device implements optional zero-delay mode via external feedback and supports PCIe-compliant spread spectrum on 100 MHz outputs.

Key Specifications

Pinout & Package

SI5334A-B10521-GM is housed in a space-saving 4 × 4 mm, 24-pin QFN package with exposed thermal pad. Pin assignments are fixed per Skyworks' Si5334 family layout and include dedicated differential input pairs (IN1/IN2, IN5/IN6), single-ended inputs (IN3, IN4), four differential output pairs (CLK0A/B through CLK3A/B), independent VDDOx supplies, control pins (OEB, LOSLOL), and power/ground terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D07589-GM, SI5334A-B10521-GM offers simpler pin-control deployment and lower system-level latency but lacks field-programmability; versus ICS8430I-01LG, it delivers full frequency agility and jitter-critical compliance at higher component cost and design complexity.

Availability

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

Supply support for SI5334A-B10521-GM 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 precision analog ICs.

The Si5334 product line delivers high-performance, low-jitter clock generation for data-intensive infrastructure applications-including telecom line cards, enterprise networking, and broadcast equipment-where deterministic timing and multi-protocol flexibility are critical.

FAQ

What input reference types does the SI5334A-B10521-GM support?

The SI5334A-B10521-GM supports four input reference types: 8–30 MHz crystal (differential), 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, and 5–710 MHz differential AC-coupled clock. Each input path includes internal termination and slew-rate optimization circuitry to preserve jitter performance. The device automatically detects and adapts to the active reference source during power-up.

Does the SI5334A-B10521-GM require external configuration memory or I²C programming?

No, the SI5334A-B10521-GM does not require external configuration memory or I²C programming. It is factory-programmed with a fixed configuration stored in one-time-programmable (OTP) NVM. Upon power-up, the SI5334A-B10521-GM begins operation immediately without host intervention, making it ideal for boot-critical timing applications.

Can all four outputs of the SI5334A-B10521-GM operate at different signal formats simultaneously?

Yes, the SI5334A-B10521-GM supports independent signal format selection per output: LVPECL, LVDS, HCSL, CMOS, SSTL, or HSTL can be mixed across CLK0–CLK3. Each output driver has its own VDDOx supply rail, enabling concurrent operation at different voltage levels (e.g., 1.8 V LVDS for FPGA I/O and 3.3 V CMOS for legacy MCU peripherals) without level-shifting components.

What is the maximum frequency achievable on each output of the SI5334A-B10521-GM?

The SI5334A-B10521-GM supports up to 350 MHz on all outputs under standard operation. For specific outputs, higher frequencies are supported: 367–473.33 MHz and 550–710 MHz are achievable on selected outputs when configured per Skyworks' MultiSynth integer/fractional mode constraints and VCO operating ranges, as validated in the official Si5334 datasheet Rev. 1.3.

How does the SI5334A-B10521-GM handle loss-of-input conditions?

The SI5334A-B10521-GM monitors input integrity via dedicated circuitry and asserts the open-drain LOSLOL pin within 5 µs of loss-of-signal or loss-of-lock detection. This alarm signal can trigger system-level fault handling-such as switching to backup clock sources or initiating safe shutdown-without requiring external supervision logic. The SI5334A-B10521-GM continues free-running from its last valid state until reset or recovery.