Skyworks Solutions Inc. SI5350C-B06882-GTR

Overview

SI5350C-B06882-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, and configurable spread spectrum-designed for replacing multiple crystals, XOs, and PLLs in compact timing systems such as residential gateways and audio/video equipment.

For engineers reviewing the SI5350C-B06882-GTR datasheet, SI5350C-B06882-GTR pinout, SI5350C-B06882-GTR application, or SI5350C-B06882-GTR equivalent, key selection criteria include its 4-output 16-QFN (3×3 mm) package, support for 25/27 MHz crystal or 10–100 MHz CLKIN reference, independent VDD/VDDO voltage scaling (1.8/2.5/3.3 V), and glitchless frequency switching via FS_0/FS_1 pins.

Technical Context

The SI5350C-B06882-GTR implements a dual-loop PLL architecture: PLLA supports spread-spectrum outputs and high-resolution fractional synthesis, while PLLB enables low-jitter synchronous clocks locked to CLKIN. Each of its four outputs (CLK0–CLK3) is driven by an independent MultiSynth divider with programmable F1_x/F2_x frequency pairs selectable via FS_0/FS_1 control pins.

It accepts either a 25 MHz or 27 MHz fundamental-mode AT-cut crystal (XA/XB) or an external 10–100 MHz single-ended clock on CLKIN. Output buffers support HCSL-compatible swing when VDDO is set to 2.5 V and use internal 50 Ω impedance-valid only in 10-MSOP and 20-QFN packages, not applicable to this 16-QFN variant.

Key Specifications

Pinout & Package

SI5350C-B06882-GTR is housed in a 16-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined 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-B06882-GTR, Si5350A-B-GM1 offers simpler pin control but lacks CLKIN flexibility and spread spectrum, while Si5351C-B-GM adds I²C configurability and output count at the cost of software dependency and larger footprint-making SI5350C-B06882-GTR optimal for fixed, 4-output, mixed-reference timing with EMI reduction.

Availability

SI5350C-B06882-GTR is available at Aetrix Electronics and suitable for residential gateways, audio/video equipment, and industrial print servers requiring stable component supply, long-term lifecycle assurance, and factory-programmed timing precision.

Supply support for SI5350C-B06882-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 for infrastructure, automotive, and consumer markets.

The Si5350C product line delivers factory-programmed, pin-configurable clock generators targeting space-constrained, cost-sensitive applications where replacing multiple discrete timing components with a single configurable device improves reliability and reduces board area.

FAQ

What reference sources does the SI5350C-B06882-GTR support?

The SI5350C-B06882-GTR supports two reference inputs: a 25 MHz or 27 MHz fundamental-mode AT-cut crystal connected to XA/XB pins, or a single-ended 10–100 MHz external clock applied to the CLKIN pin. It cannot accept both simultaneously for different PLLs-the crystal feeds the internal oscillator for PLLA/PLLB, while CLKIN directly drives PLLB for synchronous outputs. SI5350C-B06882-GTR configuration is fixed at factory and does not support runtime switching between references.

How many output frequencies can the SI5350C-B06882-GTR generate simultaneously above 112.5 MHz?

The SI5350C-B06882-GTR supports up to two unique frequencies above 112.5 MHz across its four outputs-for example, 125 MHz on CLK0 and 130 MHz on CLK1. Additional outputs may repeat those frequencies (e.g., 125 MHz on CLK2 and CLK3), but introducing a third distinct frequency >112.5 MHz violates the device's synthesis constraints and will result in invalid configuration during ClockBuilder Pro validation. SI5350C-B06882-GTR's datasheet Table 7 explicitly limits this capability.

Does the SI5350C-B06882-GTR support HCSL-compatible outputs?

No, the SI5350C-B06882-GTR in its 16-QFN (3×3 mm) package does not support HCSL-compatible outputs. HCSL functionality requires specific pin pairing and termination (e.g., CLK0/CLK1 with inverted complement) and is explicitly limited to the 10-MSOP and 20-QFN packages per Section 4.3 of the datasheet. The 16-QFN variant lacks the necessary pin arrangement and internal routing for differential HCSL generation. SI5350C-B06882-GTR provides standard CMOS outputs only.

What is the purpose of the LOLB pin on the SI5350C-B06882-GTR?

The LOLB (Loss of Lock) pin on the SI5350C-B06882-GTR is an open-drain status indicator that asserts low whenever either PLLA or PLLB loses lock to its respective reference-whether the crystal (XA/XB) or external CLKIN. It requires an external pull-up resistor and is used for system-level fault detection and recovery sequencing. This signal is not latched and reflects real-time lock status; it does not indicate individual output failure. SI5350C-B06882-GTR's LOLB behavior is defined in Section 7.2 (16-QFN pin descriptions) and Table 4 (DC characteristics).

Can the SI5350C-B06882-GTR be reprogrammed after shipment?

No, the SI5350C-B06882-GTR is factory-programmed with a fixed configuration-including output frequencies, drive strengths, spread spectrum settings, and control pin mappings-and contains no non-volatile memory or I²C interface for field reprogramming. Configuration is performed once using Skyworks' ClockBuilder Pro software prior to manufacturing. Any change requires ordering a new part number (e.g., SI5350C-Bxxxxx-GM1). SI5350C-B06882-GTR operates exclusively in pin-strapped mode with no runtime update capability.