ICS621MI - 1:4 200MHz Low-Skew Clock Buffer | Renesas
料号： ICS621MI ✓ 量产中ICS621MI 概述
A clock buffer is a digital timing IC that reproduces an input clock onto multiple outputs. It belongs to the clock and timing hierarchy, alongside clock generators, dividers, multiplexers, and phase-shifting circuits, and is used within digital logic and communications equipment. Unlike a PLL-based clock generator, the ICS621MI does not create a new frequency; its purpose is to fan out one source while limiting skew between destinations. That makes it useful when several sequential circuits must receive related clock edges and when added routing distance could otherwise distort arrival timing.
The verified headline specifications are a 1:4 fanout ratio, a maximum indicated operating frequency of 200 MHz, a 1 V to 1.8 V supply range, 3.3 V tolerant input, low-skew operation, and an 8-SOIC package. The 3.3 V tolerant input is particularly useful at system interfaces because it permits a 3.3 V-domain clock source to feed the buffer without a separate input translator. The low-voltage 1 V to 1.8 V operating range suits modern high-performance digital cores requiring compact, low-power clock distribution.
The primary engineering benefit is the relationship between fanout and timing control. One source clock is distributed to four outputs rather than being connected to four loads directly. The buffer isolates the source from downstream capacitive loading and provides matched output paths intended to reduce output-to-output skew. Because the available verified material does not publish a numeric skew value, input capacitance, output rise or fall time, or propagation-delay tolerance, those characteristics should be obtained from the manufacturer datasheet before relying on a margin in a timing-critical design.
Typical applications include high-speed digital logic, processor clock distribution, communications equipment, memory interfaces, and general-purpose fanout of a board-level or module-level clock. In each case, the designer must ensure that the source remains within the specified frequency, power-supply voltage, and input-signal limits. Decoupling close to the supply pins and short, impedance-controlled clock routes are also important because package and board parasitics can affect edge quality even when the nominal fanout and frequency ratings are satisfied.
A key design consideration is that pin-compatible does not always mean timing-identical. Before substituting another fanout buffer, verify package dimensions, input and output pin positions, supply range, output-drive capability, propagation delay, output skew, operating temperature, and the definition of the enable or output-control behavior. These checks are especially important when the replacement operates from a different voltage range or has different edge-rate characteristics. This page combines the verified distributor data, package information, interface capabilities, and application guidance into a focused engineering reference for the ICS621MI.
直接替换替代料： ICS621MI ——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ICS621MI 规格参数
| Device Type | Clock fanout buffer |
| Fanout Ratio | 1:4 |
| Maximum Operating Frequency | 200 MHz |
| Supply Voltage Range | 1 V to 1.8 V |
| Input Voltage Tolerance | 3.3 V tolerant |
| 输出数量 | 4 |
| Number of Inputs | 1 |
| Skew Characteristic | Low skew |
| 封装 | 8-SOIC (0.154 inch, 3.90 mm width) |
| 引脚数量 | 8 pins |
| 安装类型 | Surface mount |
ICS621MI 8-soic (0.154 inch, 3.90 mm width) 引脚配置指南
ICS621MI（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： ICS621MI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ICS621MI 适用于 6 应用s: High-Speed Digital Logic Clock Distribution, Processor and FPGA Clock Fanout, Communications Module Clock Distribution, Memory Interface Clock Buffering, Portable Device Clock Tree, Industrial Control and Instrumentation.
High-Speed Digital Logic Clock Distribution
The ICS621MI fits clock-distribution points that must feed four related digital loads from one source. Its verified 1:4 fanout ratio and 200 MHz operating rating provide the basic function required in high-speed logic systems, while the low-skew design targets consistent clock arrival across the four outputs. The 1 V to 1.8 V supply range suits modern low-voltage cores. Because the supplied data does not provide a numeric output-skew limit, propagation delay, or drive current, the designer must confirm those parameters from the manufacturer datasheet before assigning timing margins or driving heavily loaded nets.
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Processor and FPGA Clock Fanout
The ICS621MI can distribute a shared clock to several processor, FPGA, or peripheral clock inputs when the design operates within its 1 V to 1.8 V supply range and 200 MHz rating. A single buffered source reduces the need to route one edge-sensitive net directly to multiple endpoints. The verified 3.3 V tolerant input can simplify the boundary between a 3.3 V source clock and a low-voltage logic domain. Timing closure still requires checking the numerical skew, propagation-delay range, load capacitance, and output transition rate that are not included in the supplied search excerpts.
推荐
Communications Module Clock Distribution
In a communications module, one reference or recovered clock may need to reach several serial, digital, and control blocks. The ICS621MI's 1:4 fanout and low-skew architecture suit that use, while its 200 MHz rating covers high-speed digital interfaces within the stated limits. The 3.3 V tolerant input is useful when the source originates in a higher-voltage transceiver or control domain. Engineers should keep clock routes short, provide local supply decoupling, and verify package-level timing and loading before selecting this part for a new communications design.
推荐
Memory Interface Clock Buffering
The ICS621MI can serve as a dedicated fanout stage for clocked memory and interface logic when four destinations need the same source edge. Its low-skew positioning helps preserve relative timing among outputs, and the 1 V to 1.8 V operating range is compatible with many contemporary memory-interface voltage domains. The available evidence does not provide the output capacitive-load limit, edge-rate values, or per-channel skew, so memory timing checks must use manufacturer data rather than the nominal 200 MHz rating alone.
推荐
Portable Device Clock Tree
A compact 8-SOIC clock fanout can fit inside portable and wearable electronics where several subsystems share a low-voltage clock. The ICS621MI's 1:4 distribution supports that architecture without requiring four physical routes directly from the clock generator, and its 1 V to 1.8 V supply operation suits power-constrained digital sections. For battery-powered equipment, the designer should still obtain the quiescent current and power-dissipation values from the manufacturer datasheet. Placement, trace length, ground return, and decoupling should be reviewed as part of the complete clock-tree layout.
推荐
Industrial Control and Instrumentation
Industrial control boards can use the ICS621MI to distribute a common clock to multiple acquisition, control, or communication channels. The low-skew 1:4 fanout is useful where related sections must operate on a common timing reference, while the 3.3 V tolerant input eases interfacing with industrial control logic operating at higher logic levels. The part should remain within its verified 1 V to 1.8 V supply range. Industrial temperature suitability, isolation requirements, and exact timing margins cannot be confirmed from the supplied excerpts and must be checked against the complete manufacturer documentation.
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推荐产品汇总
工程参考数据： ICS621MI ——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 |
|---|---|
| Device Type | 1:4 clock fanout buffer |
| Maximum Operating Frequency | 200 MHz |
| Supply Voltage Range | 1 V to 1.8 V |
| Input Voltage Tolerance | 3.3 V tolerant |
| Number of Outputs | 4 |
| Skew Characteristic | Low skew |
| Package | 8-SOIC (0.154 inch, 3.90 mm width) |
| Brand | Renesas Electronics |
关键差异点
- Single-input distribution to four outputs （对比 ICS621MILF)
- Compatibility with higher-voltage clock sources （对比 ICS621MILF)
- Defined operating class for clock distribution （对比 ICS621MILF)
设计说明
Route the source and all four outputs as short, continuous clock nets, with a continuous ground reference beneath the device. Avoid routing the clock through test pads, connectors, or long stubs unless their loading has been included in timing and edge-rate analysis. Because the supplied data does not include a numeric output-skew rating or capacitive-load limit, preserve the manufacturer-recommended trace and load conditions instead of extrapolating behavior from the 200 MHz headline specification.
Place the required bypass capacitor immediately adjacent to the supply and ground pins, and keep the power and ground connections short to reduce loop area. The ICS621MI operates from 1 V to 1.8 V, while its input accepts 3.3 V signals. Do not infer that the outputs can operate at 3.3 V, and verify the clock source amplitude and output levels against the complete manufacturer datasheet before connecting external circuitry.
Do not treat a similar function as proof of drop-in compatibility. The available cross-reference material identifies ICS621MILF as functionally similar but notes inconsistent main parameters and possible circuit-structure changes. Before substitution, compare the complete pinout, land pattern, supply range, output-enable behavior, propagation delay, output skew, output-drive capability, and operating-temperature range. PCB changes or a new timing review may be necessary.
合规信息
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because ICS621MI is a general-purpose clock buffer rather than an automotive-qualified device, although no automotive qualification is stated.