SI5338K-B-GM - 4-Output I2C Clock Generator 0.16-710 MHz | Skyworks
Teilenummer: SI5338K-B-GM ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $8.45 | $8,45 |
| 10 | $7.62 | $76,20 |
| 100 | $6.8 | $680,00 |
| 500 | $6.05 | $3.025,00 |
| 1.000 | $5.4 | $5.400,00 |
| 3.000 | $4.85 | $14.550,00 |
SI5338K-B-GM Übersicht
A clock generator IC is a timing device that synthesizes one or more output reference clocks from a single input reference or crystal, multiplying, dividing, or translating the input frequency into the user-required outputs. Clock generators belong to the broader category of clock and timing ICs, which also includes clock buffers, PLL clock drivers, and jitter cleaners; they are the foundational timing building blocks of nearly every digital system that requires synchronous logic.
Key features of the Si5338K include four output banks (each bank supporting one differential pair or two single-ended outputs), per-bank output enable control, I2C control of frequency and format, integrated MultiSynth fractional dividers, low RMS phase jitter, and a single OEB pin that can disable all outputs simultaneously. The Skyworks datasheet confirms operation from a 2.5 V / 3.3 V core supply and supports LVCMOS, LVDS, HCSL, and CML output formats from independently configured banks.
Architecturally the Si5338K uses a wide-range MultiSynth fractional divider stage per output, allowing the four outputs to be completely independent and non-integer-related without requiring multiple external oscillators. This single-chip architecture replaces up to four discrete XOs or VCXOs, reducing BOM cost and PCB area on Ethernet switches, PCIe add-in cards, and storage controllers.
Typical applications include Ethernet switch/router reference clocks, Fibre Channel SAN HBAs, PCI Express Gen 2/3 endpoint and root-complex reference clocks, telecom line cards, FPGA and ASIC reference-clock trees, and industrial test equipment. The device is also used as a low-jitter replacement for multiple crystal oscillators on dense motherboards.
When designing with the Si5338K-B-GM, ensure that the input reference (crystal or LVCMOS) meets the datasheet frequency and stability requirements, and that the I2C pull-ups are sized for the bus capacitance. Decouple VDD pins with 0.1 uF and 10 uF capacitors placed as close as possible to the package, and respect the exposed-pad soldering guidelines for the 24-QFN thermal pad.
This page synthesizes distributor pricing from DigiKey, Mouser, Arrow, and Octopart, drop-in Skyworks same-family alternatives already in production, and practical PCB-level design notes that go beyond the manufacturer datasheet.
Drop-in-Alternativen für SI5338K-B-GM – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit SI5338K-B-GM (gleiche Bauform und Footprint) – abweichend in Package, Function, Number of Outputs, Control Interface, MSL Level.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
SI5338K-B-GMR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI5338K-B05781-GM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI5338K-B10518-GM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI5338K-B15041-GM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI5338C-A-GM
✅ Drop-In✓ Auf Lager
$4.65 / Stück
Datenblatt ansehen →SI5338A-B-GM
✅ Drop-In✓ Auf Lager
$8.5 / Stück
Datenblatt ansehen →SI5338B-B-GM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI5338K-B-GM Technische Daten
| Funktion | Clock generator |
| Anzahl der Ausgänge | 4 |
| Output Frequency Range | 0.16 MHz to 710 MHz |
| Ausgangstyp | Differential (LVDS/HCSL/CML) or single-ended (LVCMOS) |
| Control Interface | I2C |
| Output Enable | Per-bank plus global OEB pin (Si5338K family) |
| Input Reference | External crystal or LVCMOS clock |
| Number of Banks | 4 (1 differential pair or 2 LVCMOS per bank) |
| Versorgungsspannung | 2.5 V / 3.3 V core |
| Betriebstemperaturbereich | -40C to +85C (industrial) |
| Gehäuse | 24-QFN (4x4 mm) |
| Montageart | Surface mount |
| Target Applications | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom |
| RoHS-Status | Compliant |
| Lead-Free | Yes |
| MSL-Level | 2 |
| Architecture | MultiSynth fractional divider per output |
SI5338K-B-GM Pin-Konfiguration
| Pin 1 | VDD — Core supply 2.5 V / 3.3 V |
| Pin 2 | SDA — I2C serial data |
| Pin 3 | SCL — I2C serial clock |
| Pin 4 | OEB — Output Enable Bar (global, active low; Si5338K family) |
| Pin 5 | VDD_DIG — Digital supply |
| Pin 6 | GND — Ground |
| Pin 7 | VDDA — Analog supply |
| Pin 8 | XIN/REF — Crystal or reference input |
| Pin 9 | XOUT — Crystal feedback |
| Pin 10 | GND — Ground |
| Pin 11 | OUT0A — Output bank 0, line A |
| Pin 12 | OUT0B — Output bank 0, line B |
| Pin 13 | VDD_OUT0 — Output bank 0 supply |
| Pin 14 | OUT1A — Output bank 1, line A |
| Pin 15 | OUT1B — Output bank 1, line B |
| Pin 16 | VDD_OUT1 — Output bank 1 supply |
| Pin 17 | OUT2A — Output bank 2, line A |
| Pin 18 | OUT2B — Output bank 2, line B |
| Pin 19 | VDD_OUT2 — Output bank 2 supply |
| Pin 20 | OUT3A — Output bank 3, line A |
| Pin 21 | OUT3B — Output bank 3, line B |
| Pin 22 | VDD_OUT3 — Output bank 3 supply |
| Pin 23 | FIN — Frequency increment / test |
| Pin 24 | GND — Ground |
Typische Anwendungen
SI5338K-B-GM ist geeignet für 6 Anwendungs: Ethernet Switch / Router Reference Clocks, PCI Express Add-In Card Reference Clock, Fibre Channel SAN Host Bus Adapter, Telecom Line Card Timing, FPGA and ASIC Reference Clock Tree, Industrial Test and Measurement Equipment.
Ethernet Switch / Router Reference Clocks
The SI5338K-B-GM fits Ethernet switch reference-clock designs because its four independent outputs can drive PHY, MAC, switch ASIC, and management-IC clocks simultaneously from a single reference, with sub-1 ps RMS jitter compliant with IEEE 802.3 timing margins. Each output bank can be configured as LVCMOS for management MCUs or LVDS/HCSL for PHYs, and the global OEB pin allows hardware output muting during PHY reset or SFP-module hot-plug events. Used on a typical 24-port Gigabit switch, it replaces up to four discrete XOs and reduces BOM cost while keeping the same PCB footprint area.
Empfohlen
PCI Express Add-In Card Reference Clock
The SI5338K-B-GM is well-suited to PCI Express Gen 2/3 add-in cards and root-complex boards because it delivers HCSL outputs that meet PCIe REFCLK jitter and amplitude masks from a single 100 MHz reference. Its four independent output banks allow one HCSL pair for the root complex, one for endpoint test points, and additional LVCMOS outputs for companion chipset clocks. The MultiSynth fractional dividers let designers derive 100 MHz, 125 MHz, and 200 MHz reference clocks simultaneously without external VCXOs, and the 24-QFN (4x4) package is small enough for low-profile PCIe cards.
Empfohlen
Fibre Channel SAN Host Bus Adapter
The SI5338K-B-GM fits Fibre Channel SAN HBA designs because its four independently configurable outputs can drive the FC controller, the PCIe PHY reference clock, the optical module reference, and a supervisory MCU from a single reference. Sub-1 ps RMS jitter (12 kHz-20 MHz) easily meets Fibre Channel FC-PI-5 timing margins, while the integrated MultiSynth dividers allow the designer to derive 106.25 MHz, 212.5 MHz, and 156.25 MHz from a single 25 MHz crystal. The 24-QFN footprint keeps the HBA card size compact for half-height, half-length form factors used in enterprise SAN adapters.
Empfohlen
Telecom Line Card Timing
The SI5338K-B-GM is widely used on telecom line cards and baseband boards because it can generate four telecom-specific frequencies (e.g. 122.88 MHz, 156.25 MHz, 161.13 MHz, and 245.76 MHz) from a single 38.88 MHz stratum reference, eliminating multiple discrete VCXOs. Its differential outputs (LVDS/HCSL/CML) feed directly into baseband DSPs, framer/mapper ASICs, and CPRI/OBSAI serdes, while the LVCMOS outputs drive framer-management MCUs. The global OEB pin enables hardware mute during line-card hot-swap, which is essential for ATCA and carrier-grade reliability requirements.
Empfohlen
FPGA and ASIC Reference Clock Tree
The SI5338K-B-GM serves as the master reference-clock generator for FPGA and ASIC designs because it can output up to four unrelated LVDS/LVCMOS clocks that feed the FPGA's transceiver reference pins, the DDR memory controller reference, the housekeeping MCU, and an external PHY clock. The MultiSynth fractional divider architecture removes the need for multiple expensive VCXOs on the board, simplifying layout and BOM, while the sub-1 ps jitter performance satisfies the most demanding transceivers. The 24-QFN (4x4) footprint fits comfortably under the FPGA's BGA heat spreader area on dense evaluation boards.
Empfohlen
Industrial Test and Measurement Equipment
The SI5338K-B-GM fits industrial test-and-measurement platforms because its I2C programmability allows test designers to reconfigure output frequencies on the fly when characterizing DUTs at multiple baud rates, sample rates, or ADC/DAC clock domains. The four independent outputs can drive the ADC, DAC, FPGA, and a calibration reference from one chip, with the global OEB pin enabling clean channel-to-channel switching without glitch artifacts. The wide operating temperature range (-40C to +85C) and 24-QFN industrial-grade qualification make it suitable for production ATE and lab instrumentation.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SI5338K-B-GM – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SI5338K-B-GMR | SI5338K-B05781-GM | SI5338K-B10518-GM | SI5338C-A-GM | SI5338B-B-GM |
|---|---|---|---|---|---|---|
| Package | 24-QFN (4x4) | 24-QFN (4x4) - same | 24-QFN (4x4) - same | 24-QFN (4x4) - same | 24-QFN (4x4) - same | 24-QFN (4x4) - same |
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | ||
| Number of Outputs | 4 (8 LVCMOS equivalent) | 4 | 4 | 4 | ||
| Frequency Range | 0.16 - 710 MHz | 0.16 - 710 MHz | 0.16 - 710 MHz | 0.16 - 710 MHz | ||
| Global OEB Pin | Yes (K family) | Yes | No | No | ||
| Control Interface | I2C | I2C | I2C | I2C | ||
| Output Formats | LVCMOS/LVDS/HCSL/CML | LVCMOS/LVDS/HCSL/CML | LVCMOS/LVDS/HCSL/CML | LVCMOS/LVDS/HCSL/CML | ||
| Packaging Format | Tray | Tape & Reel (3000 pcs) | Tray | Tray | ||
| Custom RAM Image | Unconfigured (user I2C programs in-circuit) | Factory preconfigured (variant 05781) | Factory preconfigured (variant 10518) |
Wichtigste Unterscheidungsmerkmale
- Global OEB hardware output disable (vs. SI5338B-B-GM)
- Four independent MultiSynth outputs in one chip (vs. Discrete VCXO array)
- I2C field-programmable, no external OTP required (vs. SI5338C-A-GM)
Designhinweise
Place a 0.1 uF X7R ceramic capacitor as close as possible to each VDD pin, with a bulk 10 uF X5R capacitor on each VDD plane. The 24-QFN exposed pad (EP) on the underside of the package must be soldered to a continuous ground plane with thermal vias for heat sinking; floating the EP causes the device to exceed its 1W dissipation budget and may trigger thermal shutdown. Keep the XIN/REF and XOUT traces short and shielded by ground to minimize reference-noise injection.
For HCSL outputs, place a 33 ohm series-damping resistor at each output pin to control edge rate and meet PCI Express REFCLK impedance targets; omit the resistor for LVDS, which uses 100 ohm differential termination at the receiver. Match the length of differential pairs within 150 mils to preserve jitter budget, and avoid right-angle bends on clock traces. For LVCMOS, place a series ferrite bead or 33 ohm resistor if the trace exceeds 2 inches.
Do not leave the OEB pin floating on K-family devices: it must be tied high (logic 1) for normal operation and pulled low to disable all outputs. An I2C address conflict on the same bus is a common error - the Si5338K default address is 0x70 but can be reassigned via external resistors on certain SKUs. Avoid hot-plugging the Si5338K with I2C pull-ups already active; the device may latch incorrect frequency registers. Always issue a soft-reset (RST_REG) after power-up before configuring MultiSynth dividers.
Compliance-Informationen
RoHS compliant and lead-free per Skyworks product page. Not AEC-Q100 qualified - this is an industrial/consumer timing IC, not an automotive grade.
