Skyworks Solutions Inc. SI5324E-C-GM

Overview

SI5324E-C-GM from Skyworks Solutions is a low-bandwidth, jitter-attenuating precision clock multiplier IC based on 3rd-generation DSPLL® technology. It accepts two differential input clocks (2 kHz–710 MHz), generates two independently programmable output clocks (2 kHz–945 MHz, up to 1.4 GHz at select ratios), and delivers ultra-low jitter of 290 fs rms (12 kHz–20 MHz) - meeting ITU-T G.8251 and Telcordia GR-253-CORE specifications for synchronous Ethernet and OTN timing applications.

For engineers reviewing the SI5324E-C-GM datasheet, SI5324E-C-GM pinout, SI5324E-C-GM application, or SI5324E-C-GM equivalent, this device supports I²C/SPI configuration, hitless input clock switching with phase build-out, digital hold operation, and configurable LVPECL/LVDS/CML/CMOS outputs - critical for evaluating timing integrity in packet optical transport, Synchronous Ethernet, and broadcast video systems.

Technical Context

The SI5324E-C-GM implements a digitally programmable DSPLL with loop bandwidth adjustable from 4 Hz to 525 Hz, enabling application-specific jitter attenuation optimization. Its architecture includes dual independent input dividers (N1_HS, NC1_LS/NC2_LS), dual output dividers (N2, N31/N32), skew-adjustable outputs, and integrated loss-of-signal (LOS), loss-of-lock (LOL), and frequency-offset (FOS) monitoring.

It supports external crystal or reference clock inputs (XA/XB), freerun and digital hold modes, and configurable signal formats per output. The device uses on-chip voltage regulation with high PSNR and operates from single 1.8 V ±5%, 2.5 V ±10%, or 3.3 V ±10% supply - eliminating need for external VCXO or analog loop filter components.

Key Specifications

Pinout & Package

SI5324E-C-GM is housed in a 6 × 6 mm, 36-pin QFN package with exposed thermal pad. Pin functions are validated per Skyworks Rev. 1.1 datasheet (pp. 60–63) and match the Si5324 family pin assignment diagram.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar jitter-attenuating clock multiplier applications.

Compared with Si5325E-C-GM and LTC6955IUF#PBF, the SI5324E-C-GM uniquely balances sub-300 fs jitter, telecom-grade redundancy (hitless switch, digital hold), and flexible any-frequency synthesis - making it optimal for OTN, SyncE, and broadcast video where both precision and fault resilience are mandatory.

Availability

SI5324E-C-GM is available at Aetrix Electronics and suitable for packet optical transport systems, Synchronous Ethernet line cards, and broadcast video genlock applications requiring stable component supply, long-term lifecycle support, and full traceability.

Supply support for SI5324E-C-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 leader in high-performance analog semiconductors, specializing in RF, mobile, infrastructure, and timing solutions with emphasis on signal integrity and power efficiency.

The Si5324 product line delivers any-frequency jitter-attenuating clock multiplication for carrier-grade telecom, enterprise networking, and broadcast infrastructure - designed to replace discrete PLL + VCXO + filter assemblies with a single, software-configurable IC.

FAQ

What is the minimum input clock frequency supported by the SI5324E-C-GM?

The SI5324E-C-GM supports input clock frequencies as low as 2 kHz, enabling compatibility with low-frequency reference sources such as GPS-disciplined oscillators and atomic clock outputs. This capability is confirmed in Table 3 of the Skyworks datasheet (Rev. 1.1, p. 9) and applies directly to the SI5324E-C-GM variant.

Does the SI5324E-C-GM support both I²C and SPI interfaces simultaneously?

No - the SI5324E-C-GM uses the CMODE pin to select either I²C (CMODE = low) or SPI (CMODE = high) mode; both interfaces cannot operate concurrently. This hardware-selectable configuration is defined in the Functional Block Diagram (p. 2) and Pin Descriptions (p. 60) of the SI5324E-C-GM datasheet.

What is the typical lock time for the SI5324E-C-GM at 7 Hz loop bandwidth?

At 7 Hz loop bandwidth, the SI5324E-C-GM achieves typical lock time of 1.0 second (max 1.5 s), as specified in Table 3 (p. 11) under "Lock Time" for the SI5324E-C-GM grade. This value assumes f_in = f_out = 622.08 MHz, LVPECL I/O, and 114.285 MHz XA/XB reference.

Can the SI5324E-C-GM generate 100G Ethernet clock rates like 103.125 GHz?

No - the SI5324E-C-GM maximum output frequency is 945 MHz (standard range) or 1.4 GHz (select frequencies only). 103.125 GHz is a typo; 100G Ethernet uses 103.125 MHz (not GHz) PAM4 lanes, which the SI5324E-C-GM supports directly as a 103.125 MHz output or via integer division from higher base frequencies.

Is the SI5324E-C-GM RoHS-compliant and lead-free?

Yes - the SI5324E-C-GM is Pb-free and RoHS-compliant, as explicitly stated in the Features section (p. 1) of the Skyworks datasheet. The "-GM" suffix denotes green (halogen-free, lead-free) packaging per JEDEC standards, verified in the Ordering Guide (p. 64).