Skyworks Solutions Inc. SI5350A-B05042-GTR

Overview

SI5350A-B05042-GTR from Skyworks Solutions is a factory-programmed, pin-controlled CMOS clock generator delivering three independent output clocks (CLK0–CLK2) with exact frequency synthesis from 2.5 kHz to 200 MHz, 0 ppm error, <70 ps pk-pk period jitter, and spread spectrum support - deployed in audio/video processors and HDMI timing systems.

For engineers reviewing the SI5350A-B05042-GTR datasheet, SI5350A-B05042-GTR pinout, SI5350A-B05042-GTR application, or SI5350A-B05042-GTR equivalent, key selection factors include its 10-MSOP package, 3-output configuration, 25/27 MHz crystal reference, independent VDD/VDDO voltage scaling (1.8/2.5/3.3 V), and glitchless dual-frequency switching via FS_0/FS_1 pins.

Technical Context

The SI5350A-B05042-GTR implements a dual-PLL + per-output fractional MultiSynth architecture enabling simultaneous non-integer-related frequencies on all three outputs. Each output uses a dedicated high-resolution divider with optional F1_x/F2_x dual-frequency programming controlled by FS_0/FS_1 pins.

It accepts only a fixed 25 MHz or 27 MHz fundamental-mode AT-cut crystal on XA/XB inputs, supports HCSL-compatible swing at 2.5 V VDDO (with external termination), and provides configurable output states (high/low/high-Z) and power-down per unused output - all without I²C interface.

Key Specifications

Pinout & Package

SI5350A-B05042-GTR is packaged in a 10-pin MSOP (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-B05042-GTR, Si5350A-B05041-GT offers identical hardware compatibility but different preloaded frequencies, while Si5351A-B-GT trades factory precision and lower jitter for field-programmability - making SI5350A-B05042-GTR optimal for cost-sensitive, high-volume A/V timing where EMI compliance and deterministic performance are critical.

Availability

SI5350A-B05042-GTR is available at Aetrix Electronics and suitable for audio/video timing, HDMI interface design, and embedded network processor clocking requiring stable component supply, long-term lifecycle assurance, and factory-traceable frequency calibration.

Supply support for SI5350A-B05042-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 Si5350A family is designed for cost-sensitive, high-volume applications requiring replacement of multiple crystals and oscillators - emphasizing pin-strapped simplicity, ultra-low jitter, and EMI-reducing spread spectrum without microcontroller dependency.

FAQ

What reference crystal frequency does the SI5350A-B05042-GTR require?

The SI5350A-B05042-GTR requires a 25 MHz or 27 MHz fundamental-mode AT-cut crystal connected to XA/XB pins. It does not accept external clock inputs or overtone crystals. Internal load capacitance options (0/6/8/10 pF) are factory-configured to match the selected crystal's specified CL, and SI5350A-B05042-GTR operation is validated only with these two frequencies per Skyworks Rev. 1.2 datasheet Section 6.1.1.

Does the SI5350A-B05042-GTR support I²C configuration?

No, the SI5350A-B05042-GTR is factory-programmed and pin-controlled only. It lacks I²C interface circuitry and cannot be reconfigured after shipment. All parameters - including output frequencies, spread spectrum settings, output states, and control pin assignments - are固化 during manufacturing using ClockBuilder Pro and are immutable in-circuit. This distinguishes SI5350A-B05042-GTR from the I²C-addressable Si5351A-B-GT variant.

Can the SI5350A-B05042-GTR generate frequencies above 112.5 MHz on all three outputs?

No. Per Skyworks datasheet Table 7 Note 1, SI5350A-B05042-GTR allows only two unique frequencies above 112.5 MHz simultaneously. For example, it can deliver 125 MHz on CLK0 and 130 MHz on CLK1, but CLK2 must be ≤112.5 MHz or match one of those two frequencies. This limitation arises from PLL resource allocation in the dual-PLL + MultiSynth architecture and applies identically across all Si5350A variants in 10-MSOP packaging.

How is spread spectrum enabled or disabled on the SI5350A-B05042-GTR?

Spread spectrum is controlled globally via the SSEN pin: driving SSEN low disables spread spectrum on all outputs configured with it, while pulling SSEN high enables it. The modulation type (down-spread or center-spread) and deviation (–0.1% to –2.5% or ±0.1% to ±1.5%) are factory-programmed and fixed for SI5350A-B05042-GTR. No per-output SSEN control exists - unlike I²C-programmable variants, SI5350A-B05042-GTR uses a single hardware pin for on/off toggling.

What is the thermal performance of the SI5350A-B05042-GTR in its 10-MSOP package?

In a standard 2-layer PCB per JESD51-2A, SI5350A-B05042-GTR (10-MSOP) has a junction-to-ambient thermal resistance (θJA) of 150 °C/W and junction-to-board (ΨJB) of 82 °C/W. On a 4-layer board, θJA improves to 126 °C/W. These values assume proper thermal pad soldering and are measured with all three outputs active at typical load. SI5350A-B05042-GTR maximum junction temperature remains 150 °C per Absolute Maximum Ratings (Table 13).