ICS551MT - 160 MHz 1:4 CMOS Clock Buffer | Renesas
Référence : ICS551MT ✓ ActifICS551MT Présentation
A clock buffer is a digital timing IC that reproduces a clock signal with controlled loading and drive characteristics. Within the product hierarchy, ICS551MT is a clock fanout buffer, a clock distribution IC, a timing IC, and ultimately a digital semiconductor. Its four-output topology is useful when a processor, controller, communications circuit, or data-conversion system requires several related clock domains that must originate from one low-jitter reference.
Key features include 160 MHz maximum frequency, 1:4 fanout capability, CMOS input and output interfaces, and operation from 3 V to 5.5 V. The 8-SOIC package supports conventional surface-mount assembly while keeping the board footprint compact. The manufacturer identifies the ICS551 family as a low-cost, small clock-buffer option within the Clock Blocks family.
The IC provides four independently usable outputs rather than requiring a cascading buffer arrangement. Each output can therefore feed a separate circuit, reducing distribution complexity and avoiding the need to reproduce the source clock multiple times. The exact output rise time, output skew, input-output delay, propagation delay, and operating-temperature limits are not disclosed in the supplied verified data and should be confirmed in the Renesas 551 datasheet before a timing-critical design is released.
Typical uses include general-purpose clock distribution in embedded systems, communications equipment, industrial control electronics, and consumer or computing subsystems. The single-input, four-output organization is particularly helpful where four loads share a common clock source and the PCB requires short, controlled clock routes rather than a long point-to-point connection.
Designers should place the 0.01 uF VDD decoupling capacitor between pin 7 and pin 6 as close as possible to the device, following the Renesas 551 datasheet. The same source recommends an optional 33 ohm series termination resistor on each clock output when the trace exceeds 1 inch, helping control reflections on longer PCB interconnects.
This page consolidates the verified distributor specifications, official application guidance, package details, pricing availability status, and engineering trade-offs for ICS551MT. It distinguishes documented electrical facts from parameters that still require confirmation, helping engineers make faster sourcing and design decisions without inventing missing timing or environmental data.
Alternatives de remplacement direct pour ICS551MT — 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 ICS551MT (même facteur de forme et même empreinte) — différant par Number of Inputs, Number of Outputs, Package, Product Type.
ICS551M
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Voir la fiche technique →ICS551MT Spécifications
| Product Type | 1:4 CMOS clock fanout buffer |
| Number of Inputs | 1 input |
| Nombre de sorties | 4 outputs |
| Maximum Frequency | 160 MHz |
| Supply Voltage Range | 3 V to 5.5 V |
| Input Logic Level | CMOS |
| Output Logic Level | CMOS |
| Boîtier | 8-SOIC, 0.154 inch body width, 3.90 mm |
| Type de montage | Surface mount |
| Manufacturer Family | Clock Blocks |
| Decoupling Requirement | 0.01 uF between VDD pin 7 and GND pin 6 |
| Output Series Termination | 33 ohm recommended for traces longer than 1 inch |
Guide de configuration des broches du ICS551MT 8-soic, 0.154 inch body width, 3.90 mm
Configuration des broches du ICS551MT (boîtier 8-soic, 0.154 inch body width, 3.90 mm). 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 ICS551MT.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ICS551MT convient pour 6 applications: Embedded Processor Clock Distribution, Communications Module Clock Fanout, Industrial Control Clock Fanout, Data Converter and Interface Clocking, Consumer Computing Clock Distribution, General-Purpose Logic Clock Buffering.
Embedded Processor Clock Distribution
ICS551MT fits embedded designs that require four destination clocks from one common source. A single input can feed four CMOS loads, reducing the need for a tree of cascaded buffers and helping keep clock routing organized. The documented 160 MHz maximum frequency covers many microprocessor, microcontroller, and peripheral clock domains operating below that limit, while the 3 V to 5.5 V supply range supports both common low-voltage rails. Place the 0.01 uF VDD-to-GND capacitor beside pins 7 and 6, route outputs directly to their loads, and use the manufacturer-recommended 33 ohm series resistor when an output trace exceeds 1 inch. Final timing margin should be checked against the complete Renesas electrical characteristics.
Communications Module Clock Fanout
A 1:4 clock fanout arrangement is useful in communications modules where several converters, interface circuits, or recovery blocks need a related clock. ICS551MT accepts one CMOS clock and provides four CMOS outputs, with operation specified from 3 V to 5.5 V and a maximum frequency of 160 MHz. This can simplify routing compared with replicating the source clock through multiple devices. The designer must still budget output loading, propagation delay, and skew because no full timing values were present in the verified excerpts. Keep traces short, apply 33 ohm source termination when a line is longer than 1 inch, and confirm receiver thresholds and edge-rate requirements before release.
Industrial Control Clock Fanout
ICS551MT can distribute a shared clock to multiple sections of an industrial control assembly, provided the operating environment remains within the device's verified electrical limits. Its four buffered outputs reduce the number of separate fanout stages, and the 8-SOIC package provides a practical surface-mount footprint for control boards. The 3 V to 5.5 V operating range supports common embedded supply rails, while the 160 MHz ceiling addresses many digital control and data-conversion clocks. Industrial systems should verify the operating-temperature range, which is not disclosed in the supplied excerpts, before using the part in an enclosure or extended industrial environment. Decouple close to pins 6 and 7 and control clock-edge reflections.
Data Converter and Interface Clocking
ICS551MT is suitable for supplying separate clock connections to data converters, serial interfaces, or digital peripherals when one source must feed four loads. The 160 MHz maximum frequency provides ample range for many interface clocks, and the CMOS outputs align with the logic family documented for the device. Fanout reduces the number of active clock sources but does not eliminate timing-budget work: propagation delay, output skew, and edge rate must be obtained from the official Renesas 551 datasheet. Keep the clock input short and place the required 0.01 uF bypass capacitor directly between VDD and GND. Add the suggested 33 ohm output resistor only when trace length or measured ringing warrants it.
Consumer Computing Clock Distribution
A four-output clock buffer can organize clock routing in consumer computing equipment where a motherboard or add-in card includes several clock consumers. ICS551MT provides the four outputs, 160 MHz maximum frequency, and 3 V to 5.5 V supply compatibility in an 8-SOIC package. The topology can replace a larger buffer tree and reduce routing complexity, provided all four destinations satisfy the device's loading and timing requirements. Because the verified data does not provide output capacitance limits, skew, or propagation delay, prototype measurements should confirm acceptable rise time and edge placement. The Renesas-recommended 0.01 uF supply bypass and optional 33 ohm terminations are important layout constraints.
General-Purpose Logic Clock Buffering
ICS551MT can reproduce one CMOS clock onto four nets for general digital logic that does not require a specialized differential or low-jitter clock architecture. Its 160 MHz maximum frequency and 3 V to 5.5 V operating range make it a straightforward choice for conventional clock routing, while the eight-pin SOIC package keeps assembly manageable. The primary design considerations are ensuring every output sees a valid load, observing specified timing limits, and preventing reflections on longer traces. Decouple VDD pin 7 to GND pin 6 with 0.01 uF close to the package, and reserve a 33 ohm source-termination position for output routes longer than 1 inch where practical.
Données de référence d'ingénierie pour ICS551MT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ICS551M |
|---|---|---|
| Package | 8-SOIC (0.154 inch, 3.90 mm width) | 8-SOIC ordering designation; verify package details |
| Brand | Renesas Electronics | Renesas Electronics |
| Function | 1:4 CMOS clock fanout buffer | Same ICS551M family designation |
| Maximum Frequency | 160 MHz | 160 MHz family candidate; confirm exact ordering code |
| Supply Voltage Range | 3 V to 5.5 V | 3 V to 5.5 V family candidate; confirm exact ordering code |
| Input Logic | CMOS | CMOS family candidate; confirm exact ordering code |
| Output Logic | CMOS | CMOS family candidate; confirm exact ordering code |
| Number of Outputs | 4 outputs | 4 outputs family candidate; confirm exact ordering code |
| Decoupling Guidance | 0.01 uF between VDD pin 7 and GND pin 6 | 0.01 uF between VDD pin 7 and GND pin 6 family guidance |
| Long-Trace Output Termination | 33 ohm recommended when trace exceeds 1 inch | 33 ohm family guidance; confirm exact ordering code |
Principaux différenciateurs
- Four clock outputs from one input (vs Single-output clock drivers)
- 160 MHz maximum operating frequency (vs Lower-speed general-purpose clock buffers)
- Compact 8-SOIC implementation (vs Larger multi-output buffer packages)
- Direct manufacturer termination guidance (vs ICS551M)
Notes de conception
Place the specified 0.01 uF decoupling capacitor directly between VDD pin 7 and GND pin 6, as stated in the Renesas 551 datasheet. Keep the loop between the capacitor, supply pin, and ground pin as short as practical, and connect the ground reference to a low-impedance plane. This arrangement limits supply disturbance when one of the four outputs drives a capacitive transition and provides a stable reference for the clock input.
The Renesas 551 datasheet states that a 33 ohm series terminating resistor may be used on each clock output when the trace is longer than 1 inch. Reserve these footprints when clock routes may grow during layout revisions. Source termination can damp reflections caused by the load and interconnect capacitance, but the final value and placement should be validated using the actual edge rate, receiver impedance, and PCB geometry.
Route the single clock input to pin 1 as directly as practical and distribute the four outputs to separate loads without unnecessary stubs. Maintain a continuous ground reference beneath clock traces and avoid sharing switching-current paths with the clock network. Although the verified material does not provide complete output timing or loading limits, conservative trace geometry reduces distortion and helps preserve predictable propagation delay and skew.
Do not treat ICS551MT as a general-purpose logic gate or assume that four outputs can accept unrestricted loads. Confirm maximum frequency, output capacitance, input thresholds, propagation delay, skew, supply current, and temperature ratings in the official datasheet. The supplied search excerpts verify the 160 MHz and 3 V to 5.5 V headline ratings but do not expose the complete electrical table, so those omitted limits must be checked before production release.
Informations de conformité
The supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the distributor listings.
