ICS309RI - 200 MHz Triple-PLL Spread-Spectrum Clock | Renesas
Référence : ICS309RI ✗ Fin de vieICS309RI Présentation
A programmable clock synthesizer is used to generate one or more stable digital clock outputs from a reference clock or crystal. By dividing or multiplying the reference frequency through internal phase-locked loops, the circuit allows system designers to reconcile multiple clock domains and reduce clock-related electromagnetic interference. Spread-spectrum operation further changes the emitted clock frequency over time, reducing narrowband emissions and improving compatibility with sensitive downstream equipment.
The ICS309RI uses serial programming to configure its clock-generation functions, allowing a host controller to set operating parameters during initialization. The presence of LVCMOS outputs makes it suitable for digital logic requiring conventional single-ended clock signaling. Its maximum frequency of 200 MHz provides ample headroom for communications, networking, storage, embedded computing, and industrial control systems that distribute clocks to processors, transceivers, and peripheral controllers.
The triple-PLL architecture is useful when one reference source must support several related output frequencies. PLL bypass allows the device to pass through a clock when a direct path is appropriate, helping designers simplify control sequences and support different operating modes. The QSOP-20 package supports compact surface-mount construction while providing the pin count needed for programming, reference, and clock outputs.
When designing around the ICS309RI, begin with the manufacturer pin-description and application-information sections to assign programming pins, reference inputs, and outputs correctly. Confirm the selected reference frequency, output ratio, output enable sequence, and bypass state in software before enabling downstream clocks. Keep clock traces short, provide continuous return paths, and account for output-enable timing when multiple loads must start in a defined sequence.
This product page combines the device’s documented architectural features with practical guidance for clock-tree integration, programming, and EMI-conscious implementation. It is intended to help engineers distinguish the ICS309RI from ordinary fixed-frequency clock generators and to evaluate whether its programmable triple-PLL architecture matches the requirements of a new board design.
Alternatives de remplacement direct pour ICS309RI — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesICS309RI Spécifications
| Device Type | Clock/Frequency Synthesizer |
| Architecture | Serial-programmable triple-PLL spread-spectrum clock synthesizer |
| Maximum Frequency | 200 MHz |
| PLL Feature | Yes, with bypass |
| Input Types | Clock or crystal |
| Type de sortie | LVCMOS |
| Number of Circuits | 1 circuit |
| Input-to-Output Ratio | 1:9 |
| Number of PLLs | 3 PLLs |
| Programming Interface | Serial |
| Clock Source | External clock or crystal input |
| Spread-Spectrum Capability | Supported |
| Boîtier | QSOP-20 |
| Type de montage | Surface mount |
Guide de configuration des broches du ICS309RI qsop-20
Configuration des broches du ICS309RI (boîtier qsop-20). 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 ICS309RI.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ICS309RI convient pour 6 applications: Programmable Embedded Clock Tree, Industrial Networking Equipment, Data Acquisition and Control Systems, Serial Communications Equipment, Audio and Video Clocking, EMI-Reduced Consumer Electronics.
Programmable Embedded Clock Tree
The ICS309RI is suitable for an embedded processor platform that needs programmable clock outputs rather than several unrelated oscillators. Its triple-PLL architecture can derive related frequencies from one clock or crystal reference, while serial programming allows firmware to adjust ratios during initialization. The 200 MHz maximum frequency provides margin for processor, memory, and peripheral clock domains. A QSOP-20 package keeps the device compact, although power, ground, and clock traces still require careful layout. The implementation should use the manufacturer’s reference circuit, configure all PLL outputs before enabling downstream loads, and preserve a deterministic startup sequence for reliable boot behavior.
Recommandé
Industrial Networking Equipment
Industrial Ethernet and network-interface equipment can use the ICS309RI to create stable reference-related clocks for processors, PHYs, and data-conversion blocks. The triple-PLL organization reduces the need for multiple unrelated frequency sources, while the serial interface permits board-specific configuration. LVCMOS outputs suit conventional single-ended digital clock receivers. Spread-spectrum capability may also help reduce narrowband emissions in systems operating near sensitive equipment. Designers should verify receiver input thresholds, clock-jitter requirements, and output-enable behavior, while maintaining short return paths and a quiet reference supply for stable PLL operation.
Recommandé
Data Acquisition and Control Systems
The ICS309RI can serve as the central clock synthesizer in data-acquisition and industrial control systems that coordinate ADC sampling, digital processing, and communication links. Its programmable triple-PLL structure allows related clock rates to share one reference, reducing component count and simplifying configuration management. The 200 MHz ceiling supports demanding digital control paths, while LVCMOS outputs provide a conventional interface to processors and programmable logic. For deterministic behavior, initialize the reference and PLL outputs before enabling converters, and use datasheet timing information to establish settling time before sampling begins.
Recommandé
Serial Communications Equipment
In serial communications equipment, the ICS309RI can generate clock signals for a transceiver, processor, and related digital interface from a common reference. Serial programming supports board-level configuration of output ratios and bypass behavior, which is useful when one platform supports multiple interface modes. The spread-spectrum function can reduce narrowband spectral concentration in clock-sensitive equipment. LVCMOS outputs are suitable for many single-ended digital blocks, but the engineer must confirm input capacitance, threshold levels, duty cycle, and frequency limits for each load before releasing the output.
Recommandé
Audio and Video Clocking
The ICS309RI can provide programmable digital clocking for audio, video, or multimedia control equipment where several functional blocks require related frequencies. A common reference can feed multiple PLL outputs, and the bypass path can support alternate operating states. Spread-spectrum clock generation may assist with electromagnetic-emission control in consumer and industrial systems. However, audio clock jitter and video timing tolerances can be stricter than general-purpose digital requirements. Confirm jitter, duty-cycle, and output-drive specifications in the manufacturer datasheet, and isolate sensitive analog paths from the digital clock and power-return paths.
Recommandé
EMI-Reduced Consumer Electronics
The ICS309RI can support consumer and smart-home products that need flexible internal timing combined with reduced narrowband clock emissions. Spread-spectrum operation allows a system clock to be distributed without concentrating energy at one fixed frequency, while the triple-PLL architecture supplies related rates for processor, memory, and communication blocks. Serial programming lets a bootloader or application processor adjust the configuration during initialization. The compact QSOP-20 package supports space-constrained boards, but designers should still allocate continuous ground under the device, route clocks away from sensitive antenna and sensor paths, and validate radiated emissions in the finished enclosure.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ICS309RI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Brand | Renesas |
| Package | QSOP-20 |
| Device Type | Clock/Frequency Synthesizer |
| Architecture | Serial-programmable triple-PLL spread-spectrum clock synthesizer |
| Maximum Frequency | 200 MHz |
| Input Type | Clock or crystal |
| Output Type | LVCMOS |
| PLL Bypass | Yes |
| Programming Interface | Serial |
| Number of Circuits | 1 circuit |
Principaux différenciateurs
- Integrated triple-PLL clock synthesis (vs Fixed-frequency clock generator)
- Programmable spread-spectrum operation (vs Non-spread-spectrum clock oscillator)
- Integrated bypass and flexible reference options (vs Basic PLL without bypass)
Notes de conception
Place the reference-input, programming, and clock-output routing according to the manufacturer’s recommended layout. Keep clock traces short and avoid crossing noisy power-switching nodes. Provide a continuous ground reference beneath the QSOP-20 device and minimize stubs on every LVCMOS output so that programmable clock edges meet receiver requirements.
Do not enable downstream logic until the reference and PLL outputs have stabilized and the programmed output-enable sequence is complete. Confirm whether the selected operating mode uses the PLL path or bypass path, and validate the requested ratio against the documented input-to-output limits. Incorrect startup sequencing can produce an undefined clock at a powered logic domain.
Separate the reference oscillator or crystal network from high-speed data and switching-power paths, and keep the clock return path continuous through the board stack-up. For spread-spectrum operation, verify that downstream receivers tolerate the frequency-modulation profile and its permitted modulation parameters. A clean reference and symmetric clock routing improve repeatability.
Spread-spectrum operation can reduce narrowband clock energy, but it does not replace correct board-level EMI control. Route clocks away from cable connectors, antennas, and sensitive analog inputs, and test radiated emissions in the final mechanical enclosure. Program the spread-spectrum profile only after confirming that receiver jitter and communication timing remain within their limits.
Informations de conformité
No specific compliance declaration for the exact ICS309RI ordering configuration was identified. Verify RoHS, REACH, lead-free, halogen-free, and conflict-mineral status with the manufacturer before procurement.
