MK2308G-1HLF - 133MHz PLL Zero Delay Buffer, 8 Outputs | Renesas
Référence : MK2308G-1HLF ✓ ActifMK2308G-1HLF Présentation
A zero delay buffer is a clock and timing IC that uses phase-locked-loop technology to regenerate an incoming clock and re-time its edges, so the buffered output edge arrives effectively coincident with the input edge instead of after a fixed logic delay. In the device hierarchy it sits under clock buffer > clock and timing IC > integrated circuit > semiconductor, and it is used wherever a design needs many phase-aligned copies of a single reference clock.
Key features of the MK2308G-1HLF include eight low-skew outputs, a maximum operating frequency of 133 MHz at 3.3 V, CMOS-compatible outputs, an integrated PLL with a bypass mode for test and debug, and per-output tri-state or stop-clock capability for bus segmentation. Because the outputs are regenerated through the PLL, the buffer also offers low phase noise and jitter performance that a simple CMOS fan-out buffer cannot match at high fan-out ratios.
Internally, the PLL is the core element: the reference clock is multiplied and phase-shifted so that output edges align closely with the input edge. The bypass path lets a test engineer or a system architect select direct (non-PLL) clock propagation for characterization, while the PLL path provides the low-skew, low-jitter behavior needed in production. The 16-SOIC outline is a standard 3.90 mm wide narrow body surface mount package, easing prototyping on common evaluation platforms.
Typical applications include CPU and FPGA clock fan-out, memory interface clock distribution, telecommunication line-card clocking, industrial control data acquisition, video timing distribution, and any system that needs multiple low-skew copies of a 133 MHz or slower reference clock.
When designing around this part, confirm that the reference clock amplitude and slew rate meet the input requirements, and use the bypass mode only for bench characterization because switching between PLL and bypass paths changes the output timing relationship. Keep the fan-out traces short and matched so that package and board skew do not dominate the device's own output-to-output skew.
This page consolidates the manufacturer device description, distributor listing data, and engineering notes on PLL zero-delay buffer selection so you can evaluate the MK2308G-1HLF against other fan-out and clock-tree options without digging through multiple documents.
Alternatives de remplacement direct pour MK2308G-1HLF — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MK2308G-1HLF (même facteur de forme et même empreinte) — différant par Device Type, Package, Maximum Frequency, Package Width, Number of Circuits.
MK2308S-2LF
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →MK2308G-1H
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MK2302S-01TR
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →MK2705SLFTR
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →MK2308G-1HILFTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MK2308G-1HLF Spécifications
| Device Type | Zero Delay Buffer (ZDB) - PLL based, 8 outputs |
| Maximum Operating Frequency | 133 MHz |
| Tension d'alimentation | 3.3 V |
| Type de sortie | CMOS |
| Output Count | 8 outputs |
| Clock Architecture | PLL based with bypass path (proprietary low-jitter PLL) |
| Number of Circuits | 1 |
| Input Type | Clock |
| Output Skew Characteristic | Low skew |
| Phase Noise Characteristic | Low phase noise |
| Output Control | Tri-state and stop-clock modes per output |
| Boîtier | 16-SOIC (0.154 inch, 3.90 mm body width) |
| Type de montage | Surface Mount |
| Température de fonctionnement | 0 C to +70 C |
| HS Code | 8542390000 |
Guide de configuration des broches du MK2308G-1HLF 16-soic (0.154 inch, 3.90 mm body width)
Configuration des broches du MK2308G-1HLF (boîtier 16-soic (0.154 inch, 3.90 mm body width)). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour MK2308G-1HLF.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MK2308G-1HLF convient pour 6 applications: CPU and FPGA Clock Fan-Out, Memory Interface Clock Distribution, Telecommunications Line-Card Clocking, Industrial Data Acquisition and Control, Video and Display Timing Distribution, Test and Measurement Instrumentation.
CPU and FPGA Clock Fan-Out
The MK2308G-1HLF regenerates one reference clock into eight phase-aligned outputs, which lets a designer feed a processor, its memory controller, and several FPGA fabric clocks from a single low-jitter source. Because the outputs come from the internal PLL rather than a logic gate, they stay tightly skewed to the input edge at frequencies up to 133 MHz, so board trace length differences of a few hundred mils do not translate into meaningful skew at the load. The eight outputs also allow unused positions to be tri-stated or stopped, which simplifies clock-tree partitioning and power management in multi-clock designs.
Recommandé
Memory Interface Clock Distribution
DDR and SDR memory subsystems need a clean, well-aligned clock delivered to the memory controller and to the memory devices themselves, with strict budget between write and read data paths. Placing the MK2308G-1HLF between the PLL reference and the memory clock pins removes the fixed propagation delay of a plain buffer and keeps the eight copies mutually skewed, which directly reduces the eye-closure penalty caused by clock-to-data misalignment. At 3.3 V and up to 133 MHz the part covers legacy memory clocking as well as slower DDR interfaces without requiring an external clock distribution chip.
Recommandé
Telecommunications Line-Card Clocking
Line cards and base-station equipment commonly need one 133 MHz or slower reference distributed to several ASICs, field-programmable gate arrays, and serializer blocks, all of which must stay locked to a common phase. The MK2308G-1HLF provides eight regenerated outputs with low phase noise and low output-to-output skew from a single 3.3 V supply, and the per-output tri-state or stop-clock capability allows unused ports to be parked during link training or failover. The 16-SOIC outline is compact enough for dense line-card designs while remaining easy to assemble on conventional surface-mount lines.
Recommandé
Industrial Data Acquisition and Control
Data acquisition and industrial control boards often sample several sensors or drives that must be triggered from a common timebase to avoid skew between channels. The MK2308G-1HLF takes one reference clock and produces eight phase-matched outputs that can be routed to multiple analog-to-digital converters, comparator latch chains, and counter blocks, guaranteeing that channels are sampled within the device's own output-to-output skew rather than at the mercy of trace matching. Operating from a single 3.3 V rail with a 16-SOIC footprint keeps the design compact, and the bypass mode provides a convenient bench path for timing characterization.
Recommandé
Video and Display Timing Distribution
Video timing chains in scaling, processing, and interface chips demand parallel clock copies with minimal relative shift, since pixel clock and data-strobe alignment directly affects horizontal and vertical blanking margins. Driving the pixel clock and associated data-strobe enables from the eight outputs of the MK2308G-1HLF keeps every branch tied to the same PLL-referenced phase, which improves video timing margins at 133 MHz and below. The stop-clock and tri-state functions let a design blank or isolate outputs during configuration without disturbing the remaining video timing distribution.
Recommandé
Test and Measurement Instrumentation
Bench instruments need to fan a reference clock out to multiple acquisition or synthesis channels without introducing channel-to-channel skew, because measurement accuracy is directly limited by timing alignment. The MK2308G-1HLF regenerates the reference through a low-jitter PLL and provides eight mutually skewed outputs, so instrument channels sample or trigger on aligned edges. The bypass mode is a genuine benefit in a lab environment, since it lets engineers select direct clock propagation for calibration and characterize the acquisition path independently of the PLL.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MK2308G-1HLF — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MK2308S-2LF | MK2308G-1H | MK2302S-01TR | MK2705SLFTR | MK2308G-1HILFTR |
|---|---|---|---|---|---|---|
| Package | 16-SOIC (0.154 inch, 3.90 mm width) | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Device Type | Zero Delay Buffer, PLL based | Zero Delay Buffer, PLL based | Zero Delay Buffer, PLL based | Zero Delay Buffer, PLL based | PLL-based clock/timing IC | Zero Delay Buffer, PLL based |
Principaux différenciateurs
- Eight regenerated outputs from one reference clock instead of a simple gate-level fan-out (vs Generic CMOS fan-out buffer)
- Integrated PLL bypass path enables bench characterization without a second clock source (vs Plain fan-out buffer without PLL)
- Per-output tri-state and stop-clock control (vs MK2302S-01TR)
- Standard 16-SOIC narrow-body surface mount footprint (vs MK2308G-1HILFTR)
Notes de conception
Treat the reference clock input as a transmission line: route it over a continuous ground plane, keep it short, and match the source impedance so the PLL sees a clean, low-jitter edge. Input slew rate and duty cycle directly influence PLL lock behavior and output jitter, so verify the source driver against the recommended operating conditions in the manufacturer datasheet. If the reference comes from an LC oscillator or a long cable, insert a local buffer to restore edge quality before the MK2308G-1HLF input.
Keep all eight output traces similar in length and terminated consistently, because the device's own output-to-output skew specification is meaningless if PCB length mismatch dominates. Reserve 50 ohm termination footprints on each output so series damping can be populated during bring-up, and place them close to the driver pins to limit ringing on long fly-out traces. Keep the bypass-mode and tri-state control nets away from switching nodes, since coupling into these high-impedance control inputs can cause unintended output state changes.
Estimated: with an 8-output 133 MHz design, decoupling close to the package is dominated by the PLL core and output toggling, not by load current. Place a 0.1 uF ceramic capacitor at each supply pin and stack a 4.7 uF to 10 uF bulk capacitor on the 3.3 V rail close to the device, with a short ground via pair. Supply ripple on a PLL clock buffer appears directly as output phase noise, so budget low-noise rail filtering upstream if the source is a switching regulator.
Do not leave the outputs in bypass mode during production use, because the timing relationship between input and output changes between PLL and direct paths. Also avoid mixing parts with different temperature grades on the same board without checking the operating ambient. A common field failure is assuming the SKUs differ only by packaging code: confirm the ordering code, package outline, and maximum frequency on each variant before substituting, and verify that the footprint is a 16-pin narrow-body SOIC rather than a TSSOP with different lead width.
Informations de conformité
The manufacturer product documentation for the MK2308G-1HLF lists a 0 C to +70 C commercial temperature grade. RoHS, REACH, lead-free, halogen-free and conflict-minerals declarations are not stated in the device listings and must be confirmed on the Renesas product page or in the manufacturer material declaration before use in a regulated design.
