Skyworks Solutions Inc. SI5338M-B05694-GMR

Overview

SI5338M-B05694-GMR from Skyworks Solutions is an I²C-programmable quad clock generator with four independently configurable differential or single-ended outputs, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and operation from 1.8/2.5/3.3 V core supply in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in Ethernet switch/router and FPGA clocking systems.

For engineers reviewing the SI5338M-B05694-GMR datasheet, SI5338M-B05694-GMR pinout, SI5338M-B05694-GMR application, or SI5338M-B05694-GMR equivalent, key selection criteria include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage per driver (1.5–3.3 V), spread-spectrum capability (0.5–5.0% down-spread), loss-of-lock/loss-of-signal alarms, and I²C/SMBus programmability via ClockBuilder Pro software.

Technical Context

The SI5338M-B05694-GMR implements a two-stage PLL architecture: Stage 1 uses a high-frequency VCO with programmable N-divider for reference-to-VCO frequency translation; Stage 2 employs four independent MultiSynth™ fractional-N synthesizers, each with M/P dividers, enabling zero-ppm precision on all four outputs. Input flexibility includes external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz) references.

Each output driver supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats with independent voltage selection (1.5/1.8/2.5/3.3 V), programmable phase offset (±45 ns, <20 ps step), and glitchless frequency increment/decrement (1 ppm steps). External feedback mode enables zero-delay operation, while INTR pin provides loss-of-lock and loss-of-signal status reporting.

Key Specifications

Pinout & Package

SI5338M-B05694-GMR is housed in a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 is top-left corner (IN1), pin 24 is bottom-right (GND). The package supports reflow soldering per JEDEC J-STD-020 (peak 260 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05694-GM and ICS8430I-01T, SI5338M-B05694-GMR offers optimal balance of programmability, jitter performance (0.7 ps RMS), and industrial temperature support in a compact 4×4 mm QFN-making it ideal for PCIe, Ethernet, and FPGA timing where field reconfiguration and mixed-voltage outputs are essential.

Availability

SI5338M-B05694-GMR is available at Aetrix Electronics and suitable for Ethernet switch/router, PCIe Gen 1–4 endpoint design, and processor/FPGA clocking applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338M-B05694-GMR 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 analog and mixed-signal semiconductors, specializing in RF, timing, and connectivity solutions for wireless, broadband, automotive, and industrial markets.

The SI5338 family is designed for high-performance, programmable clock generation in datacenter, networking, and communications equipment-emphasizing low jitter, flexible output configuration, and PCIe/Ethernet timing compliance.

FAQ

What is the maximum output frequency supported by SI5338M-B05694-GMR?

The SI5338M-B05694-GMR supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, 250 MHz on HCSL, and 200 MHz on CMOS. Frequencies above 350 MHz are limited to two unique values simultaneously (Fvco/4 and Fvco/6) due to VCO architecture constraints. All outputs maintain 0 ppm synthesis accuracy regardless of frequency.

Does SI5338M-B05694-GMR support spread-spectrum clocking (SSC)?

Yes, SI5338M-B05694-GMR supports fully programmable spread-spectrum clocking on any output: spread range 0.5–5.0%, modulation rate 33–63 kHz, and direction (down-spread only). Configuration is done via I²C registers or ClockBuilder Pro software; no external components are required.

Can SI5338M-B05694-GMR operate with a single-ended input clock?

Yes, SI5338M-B05694-GMR accepts single-ended CMOS, SSTL, or HSTL inputs on pins IN3 and IN4, supporting frequencies from 5–200 MHz (CMOS) or 5–350 MHz (SSTL/HSTL). Input thresholds are referenced to VDD (VIH = 0.7×VDD, VIL = 0.3×VDD), and slew rate should exceed 1 V/ns for optimal jitter performance.

What is the power consumption of SI5338M-B05694-GMR under typical operating conditions?

SI5338M-B05694-GMR draws 45 mA typical core supply current (IDD) when generating 100 MHz on all outputs with a 25 MHz reference clock. Output buffer current varies by format and frequency: e.g., 30 mA max for LVPECL at 710 MHz, 8 mA max for LVDS at 710 MHz, and 13–18 mA for CMOS at 200 MHz (3.3 V VDDO).

How is SI5338M-B05694-GMR programmed and configured?

SI5338M-B05694-GMR is programmed via its I²C/SMBus-compatible interface (SCL/SDA pins) using Skyworks' ClockBuilder Pro software, which generates register maps and configuration files. Configuration can be stored in on-chip OTP memory for autonomous startup, or loaded dynamically during system initialization.