Skyworks Solutions Inc. SI5350C-B04731-GTR

Overview

SI5350C-B04731-GTR from Skyworks Solutions is a factory-programmed, pin-controlled CMOS clock generator with dual PLL + MultiSynth fractional synthesis architecture. It delivers up to 4 independent, non-integer-related output frequencies (2.5 kHz–200 MHz) with 0 ppm frequency error, <70 ps pk-pk period jitter (typ), and configurable spread spectrum-used in networking, audio/video, and residential gateway timing systems.

For engineers reviewing the SI5350C-B04731-GTR datasheet, SI5350C-B04731-GTR pinout, SI5350C-B04731-GTR application, or SI5350C-B04731-GTR equivalent, key selection factors include its 16-QFN package, 4-output configuration, CLKIN/XTAL dual-reference support, per-output spread spectrum enable, and programmable control pins (P0–P3) for frequency select, power-down, and loss-of-lock monitoring.

Technical Context

The SI5350C-B04731-GTR implements a dual-loop PLL architecture where PLLA supports spread-spectrum outputs and PLLB enables low-jitter synchronous clocks referenced to CLKIN. Each of its four outputs (CLK0–CLK3) is driven by an independent MultiSynth fractional divider, allowing exact frequency synthesis without integer constraints.

It accepts either a 25 MHz or 27 MHz crystal (XA/XB) or an external 10–100 MHz clock on CLKIN, with separate core (VDD) and output (VDDOA–VDDOD) supply rails supporting 1.8 V/2.5 V/3.3 V level translation. Glitchless frequency switching is enabled via FS_0/FS_1 pins for outputs CLK0–CLK2.

Key Specifications

Pinout & Package

SI5350C-B04731-GTR is housed in a 16-pin QFN (3 × 3 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per Skyworks Rev. 1.2 datasheet Section 7.2 and Figure 4 (16-QFN block diagram).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5350C-B04731-GTR, Si5350A-B-GM1 lacks CLKIN support and output count, limiting use to simple free-running timing; Si5351C-B-GM offers more outputs and I²C control but sacrifices plug-and-play simplicity and deterministic startup behavior.

Availability

SI5350C-B04731-GTR is available at Aetrix Electronics and suitable for networking equipment, audio/video systems, and printers requiring stable component supply, factory-programmed timing precision, and pin-strapped configurability without firmware dependency.

Supply support for SI5350C-B04731-GTR 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.

The Si5350C product line delivers factory-programmable, multi-output clock generators targeting space-constrained, low-power applications in consumer, enterprise, and industrial timing systems where discrete XO replacement and EMI reduction are critical.

FAQ

What reference sources does SI5350C-B04731-GTR support?

SI5350C-B04731-GTR supports both a 25 MHz or 27 MHz crystal connected to XA/XB pins and an external 10–100 MHz single-ended clock applied to CLKIN. The device can generate free-running clocks from the crystal and synchronous clocks locked to CLKIN simultaneously-enabling dual-domain timing in a single IC.

How many output frequencies can SI5350C-B04731-GTR generate simultaneously above 112.5 MHz?

SI5350C-B04731-GTR allows only two unique frequencies above 112.5 MHz across all outputs. For example, it can deliver 125 MHz on CLK0 and 130 MHz on CLK1, but cannot also output 150 MHz on CLK2. Multiple copies of the same high-frequency signal (e.g., 125 MHz on CLK0–CLK3) are permitted.

Does SI5350C-B04731-GTR support HCSL-compatible outputs?

Yes-SI5350C-B04731-GTR supports HCSL-compatible swing on CLK0/CLK1 or CLK2/CLK3 pairs when the corresponding VDDO rail is set to 2.5 V and one output in the pair is inverted. This requires external 511 Ω and 240 Ω termination resistors per the Skyworks application circuit (Figure 3), and is supported only in 10-MSOP and 20-QFN packages-not the 16-QFN variant of SI5350C-B04731-GTR.

What is the power consumption of SI5350C-B04731-GTR with all four outputs enabled?

With all four outputs enabled, SI5350C-B04731-GTR draws 21 mA typical core supply current (IDD) at nominal VDD. Output buffer current is 2.2–5.6 mA per output (IDDOx) depending on load and frequency. Total typical supply current is ~32 mA at 3.3 V VDD and 3.3 V VDDO, assuming moderate drive strength and 5 pF load.

Can SI5350C-B04731-GTR perform glitchless frequency switching?

Yes-SI5350C-B04731-GTR supports glitchless frequency switching on CLK0–CLK2 using the FS_0 and FS_1 control pins. Each of these outputs can be preconfigured with two distinct frequencies (F1_x and F2_x) in ClockBuilder Pro; asserting FS_0 or FS_1 selects the active frequency without clock interruption or phase discontinuity.