Skyworks Solutions Inc. SI5345A-B03133-GM

Overview

SI5345A-B03133-GM from Skyworks is a 10-channel, any-frequency jitter attenuator/clock multiplier featuring fourth-generation DSPLL™ and MultiSynth™ architectures. It delivers ultra-low 90 fs rms jitter, supports differential inputs up to 750 MHz and outputs up to 1028 MHz, and operates in free-run, locked, or holdover modes - deployed in OTN transponders and SyncE-compliant carrier Ethernet switches.

For engineers reviewing the SI5345A-B03133-GM datasheet, SI5345A-B03133-GM pinout, SI5345A-B03133-GM application, or SI5345A-B03133-GM equivalent, key selection considerations include programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), G.8262 EEC Option 1/2 compliance, hitless/ramped input switching, DCO mode with 0.001 ppb step size, and independent output supply voltage configuration (1.8/2.5/3.3 V).

Technical Context

The SI5345A-B03133-GM implements a digitally controlled DSPLL with fully integrated loop filter and programmable loop bandwidth (0.1 Hz–4 kHz), enabling precise jitter filtering without external components. Its MultiSynth architecture uses fractional-N synthesis (Mn/Md, Nn/Nd) and integer-R division to generate any output frequency from any input - supporting both integer and fractional synthesis modes per channel.

It features four configurable clock inputs (IN0–IN3), ten independently programmable outputs (OUT0–OUT9), status monitoring (LOS/OOF/LOL), and dual-mode reference support (25–54 MHz crystal on XA/XB or external REFCLK). The device operates across –40 to +85 °C and stores configuration in on-chip OTP NVM for known-power-up state.

Key Specifications

Pinout & Package

SI5345A-B03133-GM is housed in a 64-pin QFN package (9 × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks Si5345 Rev D datasheet Section 9 (Pin Descriptions) and Figure 10.1 (Package Diagram).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar jitter attenuator applications.

Compared with Si5345B-D-GM, SI5345A-B03133-GM provides full 1028 MHz output capability and fractional synthesis for arbitrary frequency generation; versus LMK04832RHAR, it offers smaller footprint, integrated loop filter, and factory-programmable NVM - simplifying design-in for telecom and networking OEMs.

Availability

SI5345A-B03133-GM is available at Aetrix Electronics and suitable for OTN transponders, SyncE carrier switches, broadcast video infrastructure, and test equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed traceability.

Supply support for SI5345A-B03133-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 for communications, automotive, and industrial markets.

The Si5345 family is engineered for high-performance timing in telecom infrastructure - delivering jitter attenuation, multi-rate clock synthesis, and robust holdover for mission-critical SyncE, OTN, and packet-optical systems.

FAQ

What is the maximum output frequency supported by SI5345A-B03133-GM?

The SI5345A-B03133-GM supports differential output frequencies up to 1028 MHz and LVCMOS outputs up to 250 MHz. This range accommodates 100G Ethernet (103.125 GHz SerDes reference), CPRI, and broadcast video standards. The upper limit is enforced by the MultiSynth divider architecture and validated in Skyworks' Si5345 Rev D Electrical Specifications Table 5.1.

Does SI5345A-B03133-GM require external loop filter components?

No, SI5345A-B03133-GM integrates the entire DSPLL loop filter on-die, eliminating external resistors and capacitors. This reduces PCB area, avoids noise coupling from discrete components, and guarantees loop stability across temperature and voltage - a key differentiator from traditional PLL-based clock ICs.

How does SI5345A-B03133-GM handle input clock failure in telecom systems?

Upon input failure, SI5345A-B03133-GM automatically enters holdover mode using up to 120 seconds of stored historical frequency data. It calculates an averaged holdover frequency from a programmable window to minimize phase disturbance - maintaining <±4.6 ppm accuracy over 24 hours per ITU-T G.8262, critical for SyncE continuity.

Can SI5345A-B03133-GM generate non-integer-related output frequencies from a single input?

Yes, SI5345A-B03133-GM uses fractional-N synthesis (Mn/Md and Nn/Nd dividers) to generate any output frequency - including non-harmonically related values - from any input. For example, it can synthesize 156.25 MHz and 122.88 MHz simultaneously from a 10 MHz reference, verified in ClockBuilder Pro v3.0 frequency plan reports.

Is SI5345A-B03133-GM preprogrammed, or does it require configuration?

SI5345A-B03133-GM ships with factory-default configuration but retains full in-circuit programmability via I²C/SPI. Its on-chip OTP NVM stores custom configurations generated in ClockBuilder Pro - ensuring repeatable power-up behavior without external EEPROM or host processor intervention.