ICS551MI - 1:4 160MHz CMOS Clock Buffer | Renesas
MPN： ICS551MI ✓ 啟用中ICS551MI 概覽
A clock fanout buffer is a digital timing component that reproduces an input clock at multiple outputs. It sits between a clock source and the circuits requiring that reference, reducing fanout loading and helping isolate each destination from the others. The ICS551MI is specifically described as a low-cost, small clock buffer and is part of the ICS ClockBlocks product family. Its 1:4 topology gives a designer four available clock destinations from one source.
The verified feature set emphasizes simplicity rather than advanced configuration. The ICS551MI accepts CMOS logic, produces CMOS outputs, operates from 3 V to 5.5 V, and supports frequencies through 160 MHz. It is not presented as a programmable, differential, low-power, or phase-aligned clock-device family member. That makes it suitable where a conventional single-ended clock must be distributed to multiple conventional CMOS loads.
The 8-SOIC package provides a compact surface-mount footprint and exposes the input, outputs, supply, and ground connections needed for a conventional fanout implementation. Its operating characteristics allow operation in both 3.3 V and 5 V system contexts within the stated 3 V to 5.5 V supply range. Designers should still confirm timing, output loading, and temperature requirements against the complete manufacturer datasheet before production release because those detailed values are not present in the retrieved source excerpts.
Typical uses include distributing a processor or controller clock to communications logic, digital peripherals, counters, or data-conversion subsystems. In a four-output arrangement, the buffer can feed multiple loads while reducing the electrical burden on the original clock source. Because the outputs are not specified as independently selectable or phase-aligned in the retrieved data, the design should treat them as a conventional fanout network rather than a deterministic multi-clock generator.
The primary design consideration is to place the clock buffer close enough to the receiving circuits to limit trace loss and maintain signal integrity. PCB routing should preserve a consistent ground reference, avoid long unterminated stubs, and account for the capacitive loading introduced by each connected output. Supply decoupling and output loading should be verified against the full datasheet and the worst-case clock topology used in the final board.
This page consolidates the verified distributor specifications, package information, sourcing links, practical clock-distribution guidance, and honestly identifies missing electrical details. It is intended to help engineers locate the ICS551MI datasheet, compare it with related clock devices, and determine whether its basic 1:4 CMOS fanout function fits the target design.
直接替換替代品，適用於 ICS551MI — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ICS551MI （相同外形與佔位） — 差異在於 Number of Outputs, Package.
ICS551MI 規格
| Device Type | Clock Fanout Buffer (Distribution) IC |
| Fanout Ratio | 1:4 |
| Maximum Frequency | 160 MHz |
| Supply Voltage Range | 3 V to 5.5 V |
| Input Logic Level | CMOS |
| Output Logic Level | CMOS |
| 輸出數量 | 4 outputs |
| 封裝 | 8-SOIC (0.154 inch, 3.90 mm width) |
| 安裝類型 | Surface Mount |
| Manufacturer | Renesas Electronics Corporation |
| Product Family | ICS ClockBlocks |
ICS551MI 8-soic (0.154 inch, 3.90 mm width) 腳位配置指南
ICS551MI（8-soic (0.154 inch, 3.90 mm width) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： ICS551MI.
請參閱 資料表 以查看完整腳位配置。
典型應用
ICS551MI 適用於 6 應用s: Processor Clock Distribution, Communications Interface Clocking, Digital Counter and Timer Fanout, Data Converter Reference Clock, Industrial Control Clock Fanout, Test and Measurement Clock Distribution.
Processor Clock Distribution
The ICS551MI fits a processor-clock distribution point because it converts one CMOS clock input into four buffered outputs while operating up to 160 MHz from a 3 V to 5.5 V supply. Placing it between a controller or processor clock source and four receiving logic sections reduces the number of loads presented directly to the source. The four outputs support separate clock domains only in the broad sense of distribution; they are not described as independently programmable or phase-aligned. PCB routing should minimize stubs, maintain a continuous ground reference, and account for the aggregate capacitive load because the retrieved excerpts do not specify maximum output loading.
推薦
Communications Interface Clocking
The ICS551MI is suitable for conventional communications circuitry requiring one source clock to reach several CMOS interface blocks. Its verified 1:4 fanout, 160 MHz maximum frequency, and 3 V to 5.5 V operating range suit legacy parallel-interface and control logic in 3.3 V or 5 V systems. The buffer can isolate the originating clock driver from multiple receiver loads and shorten sensitive routing when positioned appropriately. Engineers must still confirm receiver voltage thresholds, clock-edge tolerances, and per-output capacitance in the full manufacturer datasheet because those details are absent from the retrieved excerpts.
推薦
Digital Counter and Timer Fanout
The ICS551MI can distribute a common timing reference to counters, timers, and sequential control blocks in instrumentation and embedded-control systems. Its four CMOS outputs allow multiple timing channels to share one source clock while remaining within the verified 160 MHz capability and 3 V to 5.5 V supply range. This arrangement is useful when a central oscillator or controller output would otherwise drive several loads through long traces. Layout should keep the clock net away from switching-node and high-current paths, and timing margins should be calculated from the datasheet propagation-delay and output-transition data once obtained.
推薦
Data Converter Reference Clock
The ICS551MI can fan a sampling or conversion clock to multiple CMOS data-conversion and digital-processing blocks. The 1:4 architecture provides a straightforward way to preserve a common reference across related converters, while the verified 160 MHz ceiling covers many legacy parallel-interface and control-clock requirements. At these frequencies, the PCB must provide short, controlled clock routes with an uninterrupted ground reference to limit skew and ringing. The design should verify input thresholds, output drive, load capacitance, and propagation delay from the complete manufacturer datasheet because the available source excerpts do not quantify them.
推薦
Industrial Control Clock Fanout
The ICS551MI is applicable to industrial-control logic where one deterministic clock must reach several sequencers, acquisition blocks, or communication controllers. Its simple non-programmable 1:4 CMOS architecture avoids the control overhead of a programmable clock generator, while the 3 V to 5.5 V supply range supports common industrial logic levels. For robust implementation, keep the buffer near the clock-consuming circuitry, provide local supply decoupling, and avoid routing the clock adjacent to motors, relays, or switching power stages. The verified material does not state the temperature grade, so industrial temperature qualification must be confirmed separately.
推薦
Test and Measurement Clock Distribution
The ICS551MI can distribute a common sampling or trigger clock to multiple counter, capture, and control sections of a test or measurement system. The four outputs provide fanout isolation up to the verified 160 MHz limit, allowing a central timing reference to serve several acquisition paths without overloading its source. Measurement designs should minimize trace-length differences between critical outputs when timing alignment matters and use a continuous ground plane to control return paths. Exact timing skew, output-current capability, and allowable loading remain [DATA_NEEDED] because they are not stated in the retrieved verified excerpts.
推薦
推薦產品摘要
工程參考資料，適用於 ICS551MI — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ICS551M |
|---|---|---|
| Package | 8-SOIC (0.154 inch, 3.90 mm width) | 8-SOIC (0.154 inch, 3.90 mm width) |
| Brand | Renesas Electronics | Renesas Electronics |
| Device Type | Clock Fanout Buffer (Distribution) IC | Related ICS551 clock buffer |
| Fanout Ratio | 1:4 | 1:4 |
| Input Logic | CMOS | CMOS |
| Output Logic | CMOS | CMOS |
| Number of Outputs | 4 outputs | 4 outputs |
主要差異化特點
- Verified 1:4 CMOS distribution at the stated maximum frequency (對比ICS551M)
- Broad conventional logic supply compatibility (對比ICS551M)
- Four-output clock fanout in a compact surface-mount package (對比ICS551M)
設計說明
Place the ICS551MI close to the clock-consuming logic and keep all four output routes short, continuous, and referenced to the same ground plane. Avoid long unterminated stubs because they can create reflections that become more significant as clock frequency approaches the verified 160 MHz limit. If one output is unused, follow the manufacturer's recommendation for that pin rather than leaving a long test stub. Ground-return paths should be continuous beneath the clock routes to reduce susceptibility to common-mode noise.
Decouple the 3 V to 5.5 V supply at the ICS551MI with the capacitance and placement specified by the manufacturer datasheet. Keep the switching-current return path away from the clock input and output traces, and use a low-impedance ground reference for both the buffer and receiving devices. Although the retrieved material does not specify quiescent current or output-current limits, supply noise can still degrade clock thresholds and edge quality. Validate the design across minimum, nominal, and maximum supply conditions.
Do not assume that four available outputs can each drive an unlimited load. The ICS551MI is a 1:4 fanout buffer, but the retrieved excerpts do not state its output-drive-current or capacitive-loading limits. Sum the receiver capacitance, trace capacitance, probe capacitance, and any external termination for each output before release. Also confirm enable behavior, no-connect assignments, propagation delay, and output skew from the official pinout and timing table rather than inferring them from the generic eight-pin SOIC outline.
合規資訊
No verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations were included in the supplied source excerpts. These attributes require confirmation from the current Renesas product documentation.