MK2049-36SI - 3.3V PLL Clock Synthesizer | Renesas
Référence : MK2049-36SI ✓ ActifMK2049-36SI Présentation
A PLL clock synthesizer is a clock-and-timing integrated circuit that multiplies or divides a stable reference frequency while locking its internal oscillator to that reference. In the product hierarchy, a PLL synthesizer is a clock generator, a clock-and-timing IC and ultimately a semiconductor. Compared with a free-running oscillator, the phase-locked architecture allows multiple related output frequencies to share a common 8 kHz reference, reducing frequency drift between clocks and simplifying synchronization across a communications system.
The MK2049-36 family provides one PLL-based clock-synthesis circuit with a maximum reported output frequency of 77.76 MHz. Its input and output signal format is LVCMOS, and the specified input-to-output ratio shown in the verified distributor listing is 1:3. The SI ordering suffix identifies the industrial 20-pin SOIC configuration. These characteristics make exact timing, supply-voltage and pin-level verification against the Renesas datasheet essential before replacing another PLL clock generator.
The verified datasheet guidance states that the MK2049-36 requires only a small number of external components for proper operation. Decoupling capacitors of 0.01 µF should be connected between VDD and GND close to the device, particularly at pins 4 and 7 and at pins 15 and 17. The Renesas document also recommends 33 Ω series terminating resistors on clock outputs when traces exceed one inch and the characteristic impedance is assumed to be 50 Ω. These details minimize supply coupling and high-frequency clock-edge reflections.
Typical applications include telecommunications line equipment, T1 and E1 interface systems, OC3 and E3 clock generation, Gigabit Ethernet clock-distribution networks, and legacy synchronous communications equipment. In these systems, the 3.3 V operating supply and LVCMOS interfaces simplify integration with compatible digital logic. The shared 8 kHz reference allows several output rates to remain phase-related, which is valuable when transmitters, switches, serializers and test equipment must operate coherently.
Designers should preserve the manufacturer's recommended 0.01 µF decoupling layout and account for output drive requirements when the clock net is not properly terminated. The 33 Ω source-termination guidance is especially important for long PCB traces or cable connections because excessive edge reflections can degrade timing margin and produce spurious clock activity. Supply sequencing, crystal or oscillator startup behavior, and the exact configuration of each programmable output should be checked in the full datasheet.
This product page consolidates the verified manufacturer and distributor information, identifies the documented external-component requirements, and distinguishes true same-package alternatives from redesign-level options. It also provides application-focused design guidance for engineers evaluating the MK2049-36SI as a legacy or production communications clock-synthesis component.
Alternatives de remplacement direct pour MK2049-36SI — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
MK2049-36SITR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MK2049-36SILFTR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MK2049-36SILF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MK2049-36SI Spécifications
| Product Type | PLL-based communications clock synthesizer |
| Tension d'alimentation | 3.3 V |
| Maximum Output Frequency | 77.76 MHz |
| Reference Clock Frequency | 8 kHz |
| Input Logic Level | LVCMOS |
| Output Logic Level | LVCMOS |
| Number of Circuits | 1 |
| Input-to-Output Ratio | 1:3 |
| Differential Input/Output | No/No |
| Supported Output Frequencies | T1, E1, T3, E3, OC3 and other communications frequencies |
| Boîtier | 20-pin SOIC |
| Type de montage | Surface Mount |
| Recommended Decoupling Capacitor | 0.01 µF |
| Recommended Output Series Termination | 33 Ω when trace length exceeds 1 inch |
| Assumed Output Trace Impedance | 50 Ω |
Guide de configuration des broches du MK2049-36SI 20-pin soic
Configuration des broches du MK2049-36SI (boîtier 20-pin soic). 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 MK2049-36SI.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MK2049-36SI convient pour 6 applications: T1 and E1 Line-Interface Timing, OC3 and E3 Synchronous Transport, Gigabit Ethernet Clock Distribution, Telecommunications Line-Card Timing, Synchronous Communications Test Equipment, Industrial Network-Control Clocking.
T1 and E1 Line-Interface Timing
The MK2049-36SI fits legacy T1 and E1 interface timing because the Renesas datasheet identifies T1 and E1 among the communications frequencies generated from an 8 kHz reference. Its 3.3 V supply and LVCMOS outputs support direct integration with compatible line-card logic, while the shared reference allows related clocks to remain synchronized. The device reaches 77.76 MHz maximum output frequency and uses one PLL-based clock circuit. Designers should confirm the required channel, output mapping, duty cycle and timing margins before layout, and should place the required 0.01 µF VDD-to-GND capacitors close to the specified supply pins.
Recommandé
OC3 and E3 Synchronous Transport
The MK2049-36SI is appropriate for OC3 and E3 synchronous transport systems because the official datasheet explicitly identifies OC3 and E3 among its generated communications clocks. Using an 8 kHz reference allows the PLL-based synthesizer to derive multiple related rates for equipment operating at the same synchronous hierarchy. The 3.3 V device outputs LVCMOS clocks and supports frequencies up to 77.76 MHz. In implementation, the engineer must verify each required output against the device's configuration tables, maintain the recommended 0.01 µF local decoupling and use 33 Ω series damping on clock traces longer than one inch when the board uses 50 Ω routing.
Recommandé
Gigabit Ethernet Clock Distribution
The MK2049-36SI can support legacy Gigabit Ethernet clock-distribution designs that depend on communications frequencies derived from an 8 kHz reference. The verified listing identifies Gigabit Ethernet among the intended clock outputs, while the maximum specified frequency is 77.76 MHz and the interface format is LVCMOS. This makes the part most relevant to equipment using compatible synchronous rates rather than modern multi-gigabit SerDes architectures. Board implementation should preserve short reference and supply paths, observe the mandated 0.01 µF decoupling capacitors and apply the manufacturer's 33 Ω output-series recommendation when clock traces exceed one inch at an assumed 50 Ω impedance.
Recommandé
Telecommunications Line-Card Timing
The MK2049-36SI is well matched to legacy telecommunications line-card timing where one stable 8 kHz reference must support T1, E1, T3, E3, OC3 and related clocks. Its PLL-based architecture consolidates multiple communications frequencies into one clock-and-timing IC, reducing the number of separate reference oscillators required in a line card. The 3.3 V supply and LVCMOS logic support conventional communications logic, but the one-circuit architecture does not remove the need to verify output assignments and loading. Layout should follow the datasheet's 0.01 µF supply-decoupling requirements and use series damping to control reflections on longer clock traces.
Recommandé
Synchronous Communications Test Equipment
The MK2049-36SI can provide reference-related clock outputs for synchronous communications test equipment requiring T1, E1, T3, E3 or OC3-rate signals. Its single PLL synthesizer derives multiple clock frequencies from an 8 kHz reference, helping a test system maintain coherence between source and measurement channels. The LVCMOS interface and 3.3 V operation are practical for legacy instrument boards, and the maximum output frequency of 77.76 MHz defines the upper specified rate. Instrumentation designers must account for loading, edge quality and cable reflections, using the documented 33 Ω series resistor on traces longer than one inch when the characteristic impedance is 50 Ω.
Recommandé
Industrial Network-Control Clocking
The MK2049-36SI can support legacy industrial network-control equipment that needs communications-standard clocks synchronized to an 8 kHz reference. Its ability to generate T1, E1, T3, E3, OC3 and other rates makes it useful where multiple subsystems must exchange data using related timing domains. The 3.3 V PLL-based clock circuit provides LVCMOS outputs up to 77.76 MHz, but industrial suitability depends on the device's verified environmental ratings, which were not present in the supplied search data. Before release, confirm temperature range, electromagnetic requirements and long-term supply status, then implement the specified local 0.01 µF decoupling and output damping.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MK2049-36SI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MK2049-36SITR | MK2049-36SILFTR | MK2049-36SILF |
|---|---|---|---|---|
| Package | 20-SOIC | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Product Type | PLL-based communications clock synthesizer | PLL-based communications clock synthesizer | PLL-based communications clock synthesizer | PLL-based communications clock synthesizer |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Maximum Output Frequency | 77.76 MHz | 77.76 MHz | 77.76 MHz | 77.76 MHz |
| Reference Frequency | 8 kHz | 8 kHz | 8 kHz | 8 kHz |
| Input and Output Logic | LVCMOS input and LVCMOS output | LVCMOS input and LVCMOS output | LVCMOS input and LVCMOS output | LVCMOS input and LVCMOS output |
| Number of Circuits | 1 | 1 | 1 | 1 |
| Input-to-Output Ratio | 1:3 | 1:3 | 1:3 | 1:3 |
Principaux différenciateurs
- Communications-specific multi-frequency synthesis (vs Generic PLL clock generators)
- Documented drop-in ordering alternatives (vs MK2049-36SILFTR)
- Defined external-component implementation (vs Unverified cross-brand alternatives)
Notes de conception
Place a 0.01 µF decoupling capacitor between each required VDD and GND connection as close to the device as practical. The Renesas datasheet specifically identifies pins 4 and 7 and pins 15 and 17. Keep the capacitor loop small, connect the ground return directly to the relevant ground pin and avoid routing the supply loop through noisy digital regions. This placement minimizes inductive impedance and reduces clock instability caused by supply coupling.
Use a 33 Ω series resistor on clock outputs when the trace exceeds one inch and the routing assumes 50 Ω characteristic impedance, as specified by the Renesas datasheet. Place the resistor close to the output driver so that it damps reflections before they reach the far-end receiver. Account for resistor tolerance, load capacitance, receiver threshold and actual trace geometry when validating rise time, fall time and timing margin.
Do not assume that every communication-clock PLL is interchangeable merely because it uses the same SOIC footprint. For the MK2049-36SI, confirm the 3.3 V supply, 8 kHz reference method, LVCMOS logic, required T1/E1/T3/E3/OC3 output configuration and 77.76 MHz maximum output frequency. The verified same-package alternatives are ordering variants of the MK2049-36 family; verify the exact MPN against the manufacturer's ordering information before releasing a production BOM.
Informations de conformité
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free or conflict-minerals status. These fields remain unknown rather than being inferred from the manufacturer or package type.
