ICS651MI - 1:4 200 MHz Clock Fanout Buffer | Renesas Electronics
料号： ICS651MI ✓ 量产中ICS651MI 概述
A clock fanout buffer is a clock-and-timing IC that receives one periodic signal and produces multiple buffered copies. It belongs to the broader clock-buffer and clock-driver hierarchy, where buffers are used to extend fanout, isolate a source from downstream loading, reduce edge-rate degradation, and distribute a common timing reference. The ICS651MI therefore serves as an interface between a clock source and several digital loads rather than as a frequency-generating or phase-locked-loop device.
The principal verified specifications are a 1:4 fanout ratio, a maximum operating frequency of 200 MHz, a 1.425 V to 2.625 V supply-voltage range, and an 8-SOIC package measuring 3.90 mm in width. The low-skew description indicates that the device is intended to preserve close timing relationships among its four outputs. This makes it potentially useful in communications, processor systems, test equipment, and other clocked digital equipment when one source must feed several destinations.
The ICS651MI uses a clock input and four clock outputs, providing eight functional connections in the 8-SOIC package. The public search results supplied for this product do not expose the complete numbered pin assignments, enable controls, output-drive strength, propagation-delay limits, or detailed electrical characteristics. Those values must therefore be confirmed against the manufacturer datasheet before layout or timing-signoff work. Renesas provides an official ICS651MI family datasheet page at the URL included in this record.
Typical applications include four-way clock distribution within communications equipment, fanout for processor or logic clock trees, clock buffering in industrial control systems, and synchronized distribution to multiple digital peripherals. In each case, the 200 MHz maximum frequency and four outputs are the main selection criteria. The designer should also verify input and output capacitance, supply tolerance, output enable behavior, and package-level timing data because those details are not present in the verified excerpts supplied here.
A key design consideration is that a buffer does not remove all timing uncertainty from the downstream system. Trace lengths, load capacitance, supply noise, and clock-tree topology can still affect edge arrival times. Place the buffer close to the clock source, keep output routing topology consistent where skew matters, and use controlled-impedance routing when outputs drive transmission lines. Confirm that every downstream receiver meets the available amplitude, slew-rate, and timing requirements at the selected operating frequency.
This page consolidates the verified distributor listings, manufacturer datasheet reference, package information, electrical envelope, and practical selection considerations for ICS651MI. It also distinguishes directly verified facts from unavailable electrical details and avoids presenting unverified cross-references as drop-in replacements. The resulting guidance is intended to support initial design selection, sourcing, and datasheet review without substituting for schematic-level timing and signal-integrity validation.
直接替换替代料： ICS651MI ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料ICS651MI 规格参数
| Product Type | Clock Fanout Buffer (Distribution) IC |
| Fanout Ratio | 1:4 |
| Maximum Frequency | 200 MHz |
| Supply Voltage Range | 1.425 V to 2.625 V |
| Input Signal Type | Clock |
| Output Signal Type | Clock |
| 输出数量 | 4 outputs |
| 封装 | 8-SOIC (0.154 inch, 3.90 mm width) |
| 安装类型 | Surface Mount |
| Device Family | ICS ClockBlocks |
| Timing Characteristic | Low skew |
| 引脚数 | 8 pins |
ICS651MI 8-soic (0.154 inch, 3.90 mm width) 引脚配置指南
ICS651MI（8-soic (0.154 inch, 3.90 mm width) 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： ICS651MI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ICS651MI 适用于 6 应用s: Communications Equipment Clock Distribution, Processor and Logic Clock Tree, Industrial Control Clock Fanout, Test and Measurement Instrumentation, USB and Peripheral Clock Branching, Audio and Synchronized Digital Subsystems.
Communications Equipment Clock Distribution
The ICS651MI fits a communications subsystem that already has a valid clock but requires four locally buffered copies. Its verified 1:4 fanout ratio avoids connecting a source directly to multiple loads, while the 200 MHz maximum frequency accommodates moderate-speed digital interfaces and control logic. The 1.425 V to 2.625 V operating range must match the relevant clock-domain supply. Place the buffer near the source or partition point, route the outputs with similar geometry when inter-output skew matters, and verify each load’s capacitance and switching requirements against the manufacturer datasheet. This arrangement improves distribution isolation without adding PLL frequency multiplication or programmable phase features.
推荐
Processor and Logic Clock Tree
The ICS651MI can serve as a compact four-way branch in a processor or digital-logic clock tree when the system clock is below its 200 MHz maximum. Four outputs allow a source to feed separate functional blocks while keeping the fanout burden away from the oscillator or upstream timing device. Because the verified information does not state enable controls or per-output disable behavior, the designer must determine from the official datasheet whether unused branches require a defined state. Validate setup and hold timing at every receiver, account for clock-domain crossing requirements, and preserve return-path continuity where the circuit board spans larger distances.
推荐
Industrial Control Clock Fanout
ICS651MI is suitable for an industrial control assembly when four logic sections must receive copies of a low-voltage clock at up to 200 MHz. The four outputs can organize the system into functional branches while keeping source loading predictable. Industrial suitability cannot be established from the supplied excerpts alone because the temperature range and qualification status are unavailable, so those details require manufacturer confirmation. The layout should minimize long stub branches, maintain consistent return paths, and include adequate bypassing near the 1.425 V to 2.625 V supply pins. Review rise and fall times under the actual load before relying on the 200 MHz frequency rating.
推荐
Test and Measurement Instrumentation
The ICS651MI can distribute a reference or sampling clock to four instrument blocks when the required operating frequency is no greater than 200 MHz. A common clock delivered through a dedicated buffer can reduce source-loading and edge-degradation concerns compared with directly parallel-loading one source. For measurement equipment, low skew is the relevant benefit because closely related clock edges help preserve timing relationships between channels. However, exact output-to-output skew, propagation delay, input jitter sensitivity, and capacitive-drive limits are not present in the supplied data. Engineers should consult the official Renesas datasheet and perform channel-to-channel timing characterization before using the device in precision measurement paths.
推荐
USB and Peripheral Clock Branching
The ICS651MI is useful where a USB controller or peripheral subsystem must distribute a common 1:4 clock without operating above 200 MHz. Its four outputs can feed separate interface, control, and status blocks, reducing the electrical loading placed on the upstream clock source. The chosen system must operate entirely within the 1.425 V to 2.625 V supply range, and the relevant interface standards may impose their own clock tolerances and jitter budgets. Verify those requirements against the Renesas datasheet because the supplied search excerpts contain no output-enable or timing-disable functions. Keep branches short, provide local decoupling, and test the slowest specified operating corner as well as the 200 MHz maximum-frequency condition.
推荐
Audio and Synchronized Digital Subsystems
The ICS651MI may be used to fan out a low-voltage digital clock among synchronized audio-control and signal-processing blocks when their common timing reference remains below 200 MHz. The verified low-skew positioning supports systems in which closely timed signals reach multiple destinations, although the available data does not quantify skew or jitter. The device should not be interpreted as an analog low-noise regulator or audio clock generator; its benefit is deterministic digital distribution. Validate the source clock’s jitter and amplitude, confirm every receiver’s setup and hold requirements, and assess whether any asynchronous interface requires separate synchronization. Controlled-impedance routing and consistent branch topology help preserve the intended timing relationship.
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推荐产品汇总
工程参考数据： ICS651MI ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Package | 8-SOIC (0.154 inch, 3.90 mm width) |
| Brand | Renesas Electronics |
| Fanout Ratio | 1:4 |
| Maximum Frequency | 200 MHz |
| Supply Voltage Range | 1.425 V to 2.625 V |
| Input Type | Clock |
| Output Type | Clock |
| Number of Outputs | 4 outputs |
| Timing Characteristic | Low skew |
| Product Family | ICS ClockBlocks |
关键差异点
- Provides a verified four-output clock distribution function （对比 No confirmed drop-in alternative)
- Supports moderate-speed digital clock trees （对比 No confirmed drop-in alternative)
- Designed as a low-skew distribution device （对比 No confirmed drop-in alternative)
设计说明
Place ICS651MI close to the clock source or the point where the clock tree branches. Keep the four output routes geometrically similar when output-to-output timing is important, and provide a continuous ground reference beneath the clock routes. If an output reaches a remote load or crosses a boundary between board regions, treat it as a transmission line and use controlled impedance and source termination rather than relying solely on the SOIC output impedance.
Operate the device only within the verified 1.425 V to 2.625 V supply range and place the required bypass capacitor close to the supply and ground pins. The supplied excerpts do not specify input capacitance, output capacitance, or quiescent current, so capacitor sizing cannot be derived from verified values here. Confirm the manufacturer’s recommended network and maximum output loading before finalizing the power-supply and return-path design.
Do not treat the 200 MHz maximum frequency as a guarantee that every load will operate correctly at 200 MHz. Receiver thresholds, clock slew rate, capacitive loading, board topology, source jitter, and supply noise can all reduce usable timing margin. Confirm output rise and fall times, propagation delay, skew, and logic-level limits in the official ICS651 family datasheet, then validate the assembled design across voltage and temperature corners.
Use consistent branch lengths where multiple outputs feed related circuits and avoid long unterminated stubs. If output duty-cycle distortion or edge degradation is observed, check the output loading and trace topology rather than compensating with arbitrary series resistance. Any damping or termination value should be selected from the actual board impedance and receiver capacitance because those values are not provided in the verified excerpts.
合规信息
The verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is recorded as not applicable because ICS651MI is not identified as an automotive-qualified device in the supplied data.