Skyworks Solutions Inc. SI5350A-B04825-GTR

Overview

SI5350A-B04825-GTR from Skyworks Solutions is a factory-programmed, pin-controlled CMOS clock generator with three outputs in 10-pin MSOP package, generating frequencies from 2.5 kHz to 200 MHz (0 ppm error), supporting spread spectrum on any output, and operating from a 25 MHz crystal reference. It replaces multiple crystals/XOs in audio/video and embedded timing systems.

For engineers reviewing the SI5350A-B04825-GTR datasheet, SI5350A-B04825-GTR pinout, SI5350A-B04825-GTR application, or SI5350A-B04825-GTR equivalent, key selection factors include its 3-output MSOP configuration, glitchless frequency switching via FS pins, 70 ps peak-to-peak period jitter, independent VDD/VDDO supply rails (1.8/2.5/3.3 V), and HCSL-compatible swing capability at 2.5 V VDDO.

Technical Context

The SI5350A-B04825-GTR implements a dual-PLL + eight fractional MultiSynth architecture-two PLLs (PLLA/PLLB) feed up to eight independently programmable dividers, but this specific variant is configured for three outputs (CLK0–CLK2) in 10-MSOP. Each output supports two user-defined frequencies (F1_x/F2_x) selected by FS_0/FS_1 pins.

It uses a fixed 25 MHz crystal (XA/XB) as sole reference input; no external CLKIN support. Spread spectrum is available only on PLLA-synchronized outputs and modulates at 30–33 kHz with ±0.1% to ±1.5% center-spread or –0.1% to –2.5% down-spread, configurable per output.

Key Specifications

Pinout & Package

SI5350A-B04825-GTR is housed in a 10-pin MSOP package (3.0 × 4.9 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Skyworks Rev. 1.2 datasheet Section 7.3 and Figure 4 (10-MSOP block diagram).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5350A-B04825-GTR, SI5350A-B04826-GT offers identical functionality but mandates a 27 MHz crystal, while SI5351A-B-GT trades factory precision and pin control for I²C flexibility-making it less suitable for cost-sensitive, high-volume applications requiring zero-boot-delay clocks.

Availability

SI5350A-B04825-GTR is available at Aetrix Electronics and suitable for audio/video equipment, residential gateways, and printers/scanners requiring stable component supply, guaranteed factory programming, and long-term lifecycle support.

Supply support for SI5350A-B04825-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 for wireless, broadband, automotive, and industrial markets.

The Si5350A product line delivers factory-programmed, low-jitter clock generators targeting cost-sensitive applications that replace multiple crystals and oscillators with a single configurable timing IC.

FAQ

What crystal frequency does the SI5350A-B04825-GTR require?

The SI5350A-B04825-GTR is factory-programmed for a 25 MHz fundamental-mode AT-cut crystal connected to XA/XB pins. It does not support 27 MHz crystals or external clock inputs-using any other reference invalidates timing specifications and may cause functional failure. The internal load capacitance is configured during programming and must match the crystal's specified CL (6–12 pF).

Can the SI5350A-B04825-GTR generate frequencies above 112.5 MHz?

Yes, the SI5350A-B04825-GTR can generate frequencies up to 200 MHz, but only two unique frequencies above 112.5 MHz may be active simultaneously. For example, 125 MHz on CLK0 and 130 MHz on CLK1 is valid; adding 150 MHz on CLK2 violates the specification. Multiple outputs may replicate the same high-frequency signal (e.g., 125 MHz on CLK0–CLK2) without restriction.

How does spread spectrum work on the SI5350A-B04825-GTR?

Spread spectrum on the SI5350A-B04825-GTR modulates the output frequency of PLLA-synchronized clocks at 30–33 kHz to reduce EMI. It supports center-spread (±0.1% to ±1.5%) or down-spread (–0.1% to –2.5%), selectable per output. The SSEN pin globally enables/disables spread spectrum; it has no effect on PLLB-synchronized outputs, which lack this feature entirely.

What are the voltage requirements for HCSL-compatible operation of the SI5350A-B04825-GTR?

To achieve HCSL-compatible swing, the SI5350A-B04825-GTR requires VDDOA, VDDOB, or VDDOC to be set to exactly 2.5 V (within ±10%), and the corresponding CLK output must be terminated with a 511 Ω pull-down and 240 Ω series resistor per Skyworks Figure 3. This configuration is supported only in the 10-MSOP and 20-QFN packages-not the 16-QFN variant.

Does the SI5350A-B04825-GTR support I²C configuration?

No, the SI5350A-B04825-GTR is factory-programmed and lacks I²C interface functionality. Its configuration-including output frequencies, spread spectrum settings, and control pin mappings-is permanently stored during manufacturing. For I²C reprogrammability, consider the SI5351A-B-GT, which shares the same 3-output MSOP form factor but requires runtime initialization and does not offer pin-control features like FS_0/FS_1.