ICS651M - 1:4 200MHz Clock Fanout Buffer | Renesas
MPN: ICS651M ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ICS651M Overview
A clock fanout buffer is a clock and timing IC that reproduces one input clock across multiple outputs. It belongs to the clock distribution hierarchy, where a buffer preserves edge-driven timing while increasing fanout, isolating source loading, and giving short, controlled routes to multiple receivers. Unlike a frequency-changing oscillator or PLL, the ICS651M does not create a new frequency; it distributes the supplied clock and is intended to maintain low-skew operation.
The principal verified features are the 1:4 fanout ratio, 200 MHz maximum operating frequency, clock input and clock outputs, and 1.425 V to 2.625 V supply range. The 8-SOIC package measures 0.154 inches, or 3.90 mm, in width. These values position the part as a compact, low-voltage clock distribution solution where four copies of one clock are required rather than programmable or multiplied clock synthesis.
Use the ICS651M after a stable clock source when the next circuit stages would otherwise load a single output excessively or require long branches to remote logic. Equalizing trace geometry and keeping the input and output return paths close to a continuous ground plane can help control propagation-delay differences among outputs. Engineers must also verify downstream input thresholds, output timing at the actual operating frequency, and termination requirements for each clock network.
Typical uses include coordinating clock domains in processors, FPGAs, communications equipment, test systems, and digital control logic. The device may be particularly useful where one low-voltage master clock must reach four independent loads without repeatedly branching a long net. Because its verified maximum frequency is 200 MHz, timing margins should be evaluated at the highest intended edge rate rather than relying only on the nominal operating frequency.
Place all four clock outputs into controlled PCB routes, avoid long stub traces, and provide a low-impedance return path beneath every clock edge. If unused outputs are left unconnected, their exact treatment should be confirmed from the manufacturer datasheet. Decoupling, output enable, and input-standby behavior were not included in the supplied search evidence and must be checked before layout approval.
This page consolidates verified distributor specifications, sourcing links, application context, and design cautions. Where primary documentation was unavailable in the supplied data, unknown electrical details remain explicitly marked rather than being estimated.
Drop-in alternatives for ICS651M — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesICS651M Specifications
| Device Type | Clock Fanout Buffer (Distribution) IC |
| Manufacturer | Renesas Electronics Corporation |
| Fanout Ratio | 1:4 |
| Maximum Frequency | 200 MHz |
| Input Signal Type | Clock |
| Output Signal Type | Clock |
| Number of Clock Inputs | 1 input |
| Number of Clock Outputs | 4 outputs |
| Supply Voltage Range | 1.425 V to 2.625 V |
| Nominal Core Supply | 2 V |
| Package | 8-SOIC (0.154 inch, 3.90 mm width) |
| Mounting Type | Surface Mount |
| Product Function | Single-input, four-output clock distribution |
ICS651M 8-soic (0.154 inch, 3.90 mm width) Pin Configuration Guide
Pin configuration for ICS651M (8-soic (0.154 inch, 3.90 mm width) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ICS651M.
Refer to the datasheet for full pin configuration.
Typical Applications
ICS651M is suitable for 6 applications: FPGA Clock Distribution, Processor Clock Fanout, Communications Module Timing, Industrial Control Logic, Data Converter Synchronization, Test and Measurement Equipment.
FPGA Clock Distribution
The ICS651M fits a fixed low-voltage FPGA clock tree when one source must reach four independent loads and the required edge rate does not exceed the verified 200 MHz maximum. Its 1:4 fanout reduces the need to branch a long net directly from the oscillator or PLL. Route the four outputs as controlled traces on a continuous ground plane, and verify input thresholds, capacitance, and timing at the FPGA pins. The absence of verified skew and jitter data means edge-quality margin must be evaluated before sign-off.
Recommended
Processor Clock Fanout
Use the ICS651M to distribute a common 1.425 V to 2.625 V clock to four processor-related loads when frequency synthesis is already handled elsewhere. Its verified 1:4 ratio and 200 MHz ceiling make topology selection direct for modest-frequency systems. The main engineering concern is maintaining matched clock paths while avoiding excessive capacitive loading. Confirm the processor's input voltage, maximum clock frequency, and allowable jitter with primary documentation before assigning the device to a production clock tree.
Recommended
Communications Module Timing
The ICS651M can distribute a low-voltage reference clock among four sections of a communications module, provided each receiver is compatible with the output waveform and the edge rate remains within 200 MHz. Keeping each branch short reduces sensitivity to loading differences compared with daisy-chaining one clock net. The 8-SOIC format supports compact assembly, but EMI and signal-integrity reviews should examine return paths, edge spectra, and output slew rate. Those latter values require confirmation from the full manufacturer datasheet.
Recommended
Industrial Control Logic
ICS651M is applicable in small industrial control assemblies where four digital sections must observe a shared clock and the control system operates below the verified 200 MHz limit. The single-input, four-output arrangement clarifies the clock tree and can isolate the source from four branch loads. Designers should still test startup behavior, unused-output handling, and supply tolerance at temperature. The supplied sources do not verify industrial-grade qualification, so compliance and qualification requirements must not be inferred from the application alone.
Recommended
Data Converter Synchronization
The ICS651M can provide four copies of a sampling or conversion clock to related data-acquisition stages when the system clock is already available externally. Its 200 MHz verified ceiling makes it suitable for many moderate-speed acquisition systems, but ADC sampling requirements must be checked for edge quality and jitter. Match trace geometry where simultaneous sampling accuracy depends on clock skew. Input capacitance, drive strength, and permissible output loading were not included in the verified snippets and require datasheet confirmation.
Recommended
Test and Measurement Equipment
In test equipment, a 1:4 fanout buffer is useful for distributing a low-voltage master clock to trigger, acquisition, processing, and interface sections. The compact 8-SOIC package supports board-space conservation, while four outputs avoid repetitive clock branching. Timing calibration must include output-to-output skew and deterministic delay, which were not supplied in the verified data. Therefore, the ICS651M is best positioned for moderate-speed systems where those characteristics can be verified before instrument calibration is finalized.
Recommended
Recommended Products Summary
Engineering reference data for ICS651M — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Renesas Electronics |
| Package | 8-SOIC (0.154 inch, 3.90 mm width) |
| Device Type | Clock Fanout Buffer (Distribution) IC |
| Fanout Ratio | 1:4 |
| Maximum Frequency | 200 MHz |
| Supply Voltage Range | 1.425 V to 2.625 V |
| Clock Inputs | 1 |
| Clock Outputs | 4 |
| Mounting Type | Surface Mount |
Key Differentiators
- Documented four-way clock distribution (vs No verified drop-in alternative in the supplied data)
- Moderate-frequency operation (vs No verified cross-brand equivalent)
- Compact low-voltage package (vs No verified same-package substitute)
Design Notes
Route each of the four clock outputs as a controlled transmission path rather than a daisy chain. Keep traces over a continuous ground plane, avoid unnecessary test pads and long stubs, and match output geometry when downstream devices require closely related clocks. The verified data establishes 200 MHz maximum frequency but does not provide rise time, output impedance, or skew, so these missing characteristics must be obtained before selecting series termination or trace dimensions.
Keep the clock input and all clock outputs away from noisy switching nodes, connectors, and high-current return paths. Maintain short clock connections and a low-impedance ground reference beneath every edge-sensitive trace. Decoupling capacitance and placement were not verified in the supplied sources; follow the manufacturer application guidance when available. Estimated: no propagation-delay budget can be calculated without verified output-edge and load data.
Do not assume that every 1:4, 200 MHz buffer in an 8-SOIC is a drop-in replacement. Verify pin numbers, supply tolerance, clock-input type, output-enable logic, active-low or active-high controls, drive strength, and no-connect treatment. The cross-reference search returned no validated substitute. An apparently identical pin count can hide incompatible enable pins or different output assignments, causing startup failures or clocks at the wrong receivers.
Compliance Information
The supplied search results do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is treated as not applicable because the ICS651M is categorized as a clock and timing IC, not an automotive-qualified device; no automotive qualification claim was verified.
