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ICS542MI - 156 MHz 1:2 Clock Buffer | Renesas Electronics
Renesas Electronics ICS542MI is a CMOS clock fanout buffer and divider IC that accepts a clock input up to 156 MHz and produces two clock outputs with divide ratios selected from 2, 4, 6, 8, 12, or 16. The device operates from 3 V to 5.5 V and is supplied in an 8-pin SOIC package measuring 3.90 mm in width. According to the Renesas Electronics 542 datasheet, one output is a low-skew divide-by-two version of the other output. A clock fanout buffer is a timing-device category used to distribute one periodic signal to multiple circuit loads. Clock buffers, sometimes called clock drivers, reproduce a clock with controlled loading, skew, and output characteristics. The ICS542MI combines clock distribution with programmable division, placing it in the hierarchy of clock and timing IC, clock buffer, clock divider, and timing-control semiconductor. The verified operating limit of 156 MHz supports high-speed digital logic, processor interfaces, communications equipment, and clock-tree distribution. Its 3 V to 5.5 V supply range allows use in both 3.3 V and 5 V systems, while CMOS inputs and three-state CMOS outputs support integration with digital clock domains. The exact divider-selection truth table and enable behavior should be verified against the manufacturer datasheet before implementation. Renesas describes the ICS542 as a cost-effective way to generate a high-quality divided clock output. One output provides the selected divided frequency, while the other is described as a low-skew divide-by-two output relative to that clock. This arrangement can reduce fanout loading and provide two related clocks to different downstream circuits without requiring multiple separate divider packages. Typical uses include fanout for digital logic, local clock distribution in communication systems, generation of related clocks for data converters or processors, and systems that need a divided clock alongside a further divided low-skew clock. The 8-SOIC package also makes the ICS542MI suitable for conventional surface-mount PCB layouts where a larger leaded package would be unnecessary. Designers should use short, impedance-controlled clock traces, provide a clean reference clock, and confirm output-state and division-selection requirements from the datasheet. Because the verified snippets do not provide detailed rise time, output impedance, skew, current, temperature, or pin-level thresholds, those values must not be inferred from the frequency and supply limits. This page distinguishes verified specifications from parameters that require confirmation from the manufacturer datasheet.
ICS542MT - 1:2 Clock Buffer, 156 MHz, 8-SOIC | Renesas
The Renesas ICS542MT is a clock fanout buffer and divider IC that accepts a CMOS clock input up to 156 MHz and provides a 1:2 divided clock output with three-state CMOS outputs. It operates from a 3 V to 5.5 V supply and is packaged in an 8-SOIC package measuring 0.154 inch wide and 3.90 mm in length. The ICS542MT is designed for clock distribution, frequency division, and systems where a stable divided clock is required from a higher-frequency source. A clock buffer or clock divider is a timing IC that conditions, distributes, or divides a digital clock signal. In the clock and timing hierarchy, the ICS542MT belongs to the clock buffer and divider family, which supports phase-locked-loop (PLL) based timing architectures, communications equipment, and digital processing systems. A divide-by-two function can reduce the output frequency while preserving a defined relationship to the input clock, while the three-state output structure allows the output to be disabled when it is not needed. The verified device information identifies a maximum frequency of 156 MHz, a 1:2 divide ratio, CMOS input and output signaling, and a 3 V to 5.5 V operating supply range. The manufacturer’s ICS542MT documentation describes the device as a cost-effective way to produce a quality clock output divided from a clock input. This combination makes it suitable for clock generation, timing distribution, and intermediate frequency conversion stages in communication and digital electronics. Because the ICS542MT uses proprietary PLL techniques to produce the divided clock, PCB layout and supply decoupling should be treated as part of the timing design rather than added afterward. Keep the clock input and output traces short, provide a clean ground reference, and place bypass capacitors close to the supply pins. When replacing the part, verify that the alternative has the same SOIC-8 footprint, pin assignments, input/output logic levels, and divide behavior; a similar frequency rating alone does not guarantee drop-in compatibility. Typical application areas include communications and networking clock trees, frequency conversion after an upstream oscillator or PLL, and digital subsystems requiring a locally divided clock. The page combines verified manufacturer and distributor information with practical selection guidance, application notes, and drop-in alternative analysis to help engineers evaluate ICS542MT designs faster.
ICS551M - 1:4 160MHz CMOS Clock Buffer | Renesas
The Renesas Electronics ICS551M is a 1:4 CMOS clock fanout buffer with a 160 MHz maximum operating frequency and a 3 V to 5.5 V supply range, housed in an 8-pin SOIC package. Designed as a low-cost, high-speed clock distribution device, it accepts one CMOS clock input and provides four buffered CMOS outputs, making it suitable for clock fanout in compact digital systems. A clock fanout buffer is a clock-and-timing integrated circuit that distributes one incoming clock signal to multiple downstream loads. Its place in the hierarchy is clock buffer → clock fanout buffer → clock distribution IC → timing and logic semiconductor. The ICS551M helps isolate clock loads from one another, reduces loading on the source clock, and provides separate outputs for multiple sequential or peripheral circuits. This is especially useful when a single oscillator or clock source must feed several logic blocks. Key verified characteristics include a 1:4 fanout ratio, 160 MHz maximum frequency, CMOS input and output technology, and an operating supply range of 3 V to 5.5 V. The 8-SOIC package measures 0.154 inches, or 3.90 mm, in width according to distributor data. These specifications make the device appropriate for general-purpose clock distribution where a compact surface-mount package and moderate operating frequency are sufficient. The ICS551M belongs to the ICS ClockBlocks family and is identified by distributor listings as a low-cost, small clock buffer. Because its outputs are CMOS, the downstream circuits must be compatible with the selected supply voltage and input thresholds. The device is not a PLL, oscillator, or level shifter; its function is specifically clock replication and distribution. Designers should preserve the input and output timing relationship, maintain the required supply decoupling, and account for trace and load differences among the four outputs. Typical applications include clock distribution in embedded control systems, digital logic networks, communications equipment, test and measurement systems, and general-purpose processor or peripheral clocking. For a design that needs more independent clock domains, frequency generation, or differential clock outputs, a different clock-and-timing device may be more appropriate. For applications requiring only one input and four CMOS copies, the ICS551M provides a straightforward distribution function in an established 8-SOIC footprint. The main design consideration is ensuring that every connected load, trace, and voltage domain is compatible with the available 160 MHz clock. Check rise and fall-time requirements, fanout loading, power-supply noise sensitivity, and the clock-source timing margin before production release. This page synthesizes verified distributor specifications, sourcing links, package information, and engineering guidance while leaving unverified values explicitly unresolved. The ICS551M datasheet and application information should be consulted for complete pin functions, electrical limits, timing characteristics, and recommended circuit implementation. Distributor data confirms the core identity and major specifications, but it does not provide enough evidence here to infer undocumented timing, current, or package dimensions.
ICS551MI - 1:4 160MHz CMOS Clock Buffer | Renesas
The Renesas Electronics ICS551MI is a low-cost, high-speed 1-input to 4-output CMOS clock fanout buffer rated up to 160 MHz, supplied in an 8-SOIC package. Its principal specifications are a 3 V to 5.5 V supply range, CMOS input and output interfaces, four buffered outputs, and a maximum operating frequency of 160 MHz. The device belongs to the clock and timing IC category and is designed for distributing one clock signal across several digital loads without requiring the source device to drive all loads directly. 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.
ICS551MT - 160 MHz 1:4 CMOS Clock Buffer | Renesas
Renesas ICS551MT is a low-cost, high-speed 1:4 CMOS clock fanout buffer with a maximum operating frequency of 160 MHz, a 3 V to 5.5 V supply range, and an 8-SOIC package. The device accepts one CMOS clock input and provides four buffered CMOS clock outputs, allowing a single source to drive multiple destinations without requiring multiple distribution stages. 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.
ICS553MI - 1:4 200 MHz Clock Buffer | Renesas Electronics
Renesas Electronics ICS553MI is a low-skew 1:4 clock fanout buffer with a maximum operating frequency of 200 MHz, CMOS inputs and outputs, a 2.375 V to 5.25 V supply range, and an 8-SOIC package measuring 0.154 inch, or 3.90 mm, in width. It is positioned as the lowest-skew, small clock buffer in the ICS ClockBlocks family. A clock fanout buffer is a clock-management IC that receives one periodic signal and distributes multiple synchronized copies to several destinations. The ICS553MI belongs to the fanout buffer subclass of clock and timing ICs, within the broader clock-buffer, clock-driver, and clock-management semiconductor hierarchy. Its 1:4 fanout ratio makes it suitable where one source must feed four loads without redesigning the clock tree. The primary verified specifications are a 1:4 fanout ratio, 200 MHz maximum frequency, CMOS input and output interfaces, and a 2.375 V minimum operating supply voltage with a 5.25 V maximum. The 8-SOIC package supports conventional surface-mount assembly while providing four buffered outputs. These details distinguish it from single-output clock devices, lower-frequency buffers, and devices requiring more than four outputs. The low-skew architecture is intended to minimize output-to-output timing displacement, making the device relevant to synchronous systems in which downstream circuits require closely related clock edges. Exact propagation delay, output-to-output skew, rise time, fall time, output impedance, and input pulse-width limits are not present in the supplied verified data and should be taken from the manufacturer datasheet before timing closure. Typical uses include processor and FPGA clock distribution, communications-interface clock fanout, data-converter clocking, memory-interface timing, and general-purpose digital clock-tree branching. In each case, the single input can feed four destinations while the 200 MHz operating limit defines the upper frequency envelope. The CMOS interfaces also allow the device to operate across a 2.375 V to 5.25 V supply range, subject to the input and output voltage limits in the datasheet. The principal design consideration is timing verification. Engineers should check the worst-case input-to-output and output-to-output skew across process, voltage, and temperature, rather than relying only on the 200 MHz headline frequency. Supply decoupling, input slew rate, trace loading, and the number of clock destinations also require review because they affect edge quality and timing margin. This page consolidates the verified manufacturer and distributor information, distinguishes confirmed specifications from unavailable data, and documents practical clock-tree considerations. It also explains the absence of verified drop-in substitutes so engineers can avoid assuming that a shared package or similar frequency rating guarantees pin-to-pin compatibility.
ICS570A - 170MHz Zero Delay Buffer | Renesas | Clocking
The Renesas Electronics ICS570A is a multiplier and zero-delay buffer clock IC designed for 5 V systems, with a maximum output clock frequency of 170 MHz and an 8-pin SOIC package. It combines clock multiplication, fanout distribution, and zero-delay buffering in one device, making it suitable for systems that need multiple related clock outputs without adding substantial propagation delay. According to the manufacturer datasheet information, the A version is intended for 5 V designs and the B version is intended for 3.3 V designs. A zero-delay buffer is a clock-integrity device that reproduces an input clock at one or more outputs while compensating for internal propagation delay through a phase-locked-loop technique. ICS570A uses Integrated Circuit Systems proprietary analog/digital PLL techniques, allowing the device to provide low input-to-output skew while distributing or multiplying the source clock. The part is therefore positioned between a clock source and the digital circuits, processors, or memory that require synchronized clock signals. Key documented features include support for 14 multiplier choices from 0.5x to 32x, output clock frequency up to 170 MHz at 5 V, and the ability to recover degraded input clock duty cycle. The listed low input-to-output skew is 300 ps maximum for outputs above 60 MHz. The device is also identified as functionally equivalent to the AV9170, although the manufacturer explicitly notes that the AV9170 is not a pin-for-pin replacement. Typical uses include processor and controller clock generation, communication-system clock distribution, memory clocking, retrofit or modernization of older clock architectures, and any board requiring a multiplied or buffered reference clock. The ICS570A should be selected when the surrounding circuit requires a 5 V zero-delay buffer and an 8-pin SOIC footprint. The B version or another device should be considered when the system operates from 3.3 V, because the A and B versions target different supply voltages. Designers should preserve the manufacturer's recommended input, output, termination, and load conditions. Clock jitter and skew tables depend on the termination resistance and load capacitance, so a replacement must be checked against the original clock topology rather than selected only by package. This page combines the verified manufacturer and distributor information with a conservative drop-in assessment, clearly separating confirmed replacements from parts that are only functionally equivalent.
ICS570B - 170 MHz 3.3 V PLL Clock Buffer | Renesas
The Renesas Electronics ICS570B is a 3.3 V fanout distribution, spread-spectrum clock generator and zero-delay buffer (ZDB) that provides a maximum output clock frequency of 170 MHz in an 8-pin SOIC package. It combines a proprietary analog/digital phase-locked loop with clock multiplication, fanout, duty-cycle correction and low-skew output buffering for systems that require multiple related clocks. A zero-delay buffer is a clock-integrity device that uses phase-locked-loop techniques to reproduce an input clock at its outputs with very small propagation delay relative to the source clock. It belongs to the clock and timing hierarchy of clock generators, PLL multipliers, fanout buffers, clock drivers and zero-delay buffers. The ICS570B is intended for systems where several logic domains require related clocks without introducing significant inter-clock skew. The ICS570B supports output clock frequencies up to 170 MHz at 3.3 V and can select between 14 multiplication ratios from 0.5x to 32x. It also includes fanout distribution, spread-spectrum clock generation and the ability to recover a degraded input-clock duty cycle. The maximum input-to-output skew is 300 ps for output rates above 60 MHz, making it useful for high-speed communications, storage, networking and processor clock trees. Internally, the device uses analog/digital PLL techniques rather than a simple static clock buffer. This architecture allows one reference clock to be multiplied and distributed while limiting output-to-output skew. The published family information also identifies the B version as the 3.3 V option and the A version as the 5 V option, making supply-voltage compatibility a critical selection criterion when comparing family members. Typical uses include frequency multiplication for a CPU or bus clock, fanout to multiple peripheral clock domains, spread-spectrum clock generation for reducing electromagnetic interference, and duty-cycle restoration of a degraded source clock. The 8-pin SOIC package supports conventional surface-mount assembly and keeps the footprint compact for clock-distribution sections on communication, industrial and computing boards. Designers should verify the input and output reference clock requirements, the selected multiplication ratio, output termination and load capacitance against the Renesas 570 datasheet before layout. Keep clock traces short and match trace lengths where output-to-output skew is critical. Provide a continuous ground reference under the device and place decoupling capacitors close to the supply pins. This page consolidates verified manufacturer and distributor information, published price references, family-level drop-in options and practical clock-tree design guidance. It also identifies where application-specific data, such as exact supply current, temperature range and production lifecycle status, must be confirmed against current manufacturer documentation.
ICS571M - 160MHz Zero Delay Buffer | Renesas Electronics
Renesas Electronics ICS571M is a 160 MHz fanout distribution zero-delay buffer IC packaged in an 8-pin SOIC measuring 3.90 mm wide. It is designed for clock distribution applications where a source signal must be reproduced across multiple destinations while minimizing propagation delay. The verified distributor listing identifies the device as a one-output fanout buffer with zero-delay characteristics. A zero-delay buffer belongs to the clock and timing IC hierarchy. Unlike a conventional logic buffer, which introduces a specified propagation delay, this device uses an internal buffer arrangement intended to preserve clock-edge timing between the driving source and distributed loads. Fanout buffers are used to reduce loading on a clock generator, isolate multiple destinations, and provide a repeatable distribution point on clock, data, or control networks. The principal verified characteristics are a maximum clock frequency of 160 MHz, one fanout output, and an 8-SOIC surface-mount package with a stated width of 3.90 mm. The distributor data also classifies ICS571M under Clock Generators, PLLs, and Frequency Synthesizers, reflecting its primary use within clock and timing systems. Detailed supply-voltage, output-impedance, skew, jitter, and temperature limits were not present in the supplied verified records. ICS571M is suited to communication equipment, processor clock networks, data converters, instrumentation, and industrial electronics requiring local clock distribution. Its small SOIC outline supports compact designs, while the zero-delay architecture can be preferable when an upstream source must drive several clocked loads without intentionally adding another propagation-delay stage. Designers should verify input slew rate, output loading, supply voltage, and timing margins against the manufacturer datasheet before release. Decoupling and return-path planning remain important because a clock buffer can reproduce upstream supply noise and edge distortion at every distributed output. PCB length matching may also be required in systems with stringent setup-and-hold limits. This product record consolidates verified distributor specifications, sourcing links, practical application guidance, and honest data-gap disclosures. It also distinguishes confirmed parameters from values that require datasheet review, helping engineers make a technically defensible selection without treating unverified electrical limits as guaranteed specifications.
ICS574M - 160MHz 1:4 PLL Zero-Delay Buffer | Renesas
Renesas Electronics ICS574M is a PLL-based 1:4 fanout and zero-delay buffer rated up to 160 MHz, with CMOS inputs and CMOS clock outputs in an 8-SOIC surface-mount package. The device contains one clock circuit, uses a 1:4 input-to-output ratio, and provides four low-skew outputs for high-speed clock-distribution systems. Its operating-temperature range is 0°C to 70°C, and supplier records identify the part as obsolete or end-of-life. A zero-delay buffer is a clock and timing IC that combines a phase-locked loop with multiple output stages. Within the product hierarchy, it belongs to clock distribution devices, which are part of clock and timing integrated circuits and ultimately semiconductor signal-management components. By compensating for internal propagation delay while distributing one source clock across four outputs, this type of device helps maintain controlled timing relationships across multiple digital loads. The primary characteristics of the ICS574M are its 160 MHz maximum operating frequency, 1:4 input-to-output fanout, CMOS logic compatibility, and PLL-based zero-delay operation. Four independently available clock outputs make the device suitable where one incoming reference must drive several clock domains while limiting output-to-output timing skew. The 8-SOIC package provides a compact surface-mount format with a stated body width of 3.90 mm and lead pitch of 0.154 inches. Technically, the PLL-based architecture is intended to reduce propagation delay and skew across distributed outputs. The verified device information identifies the input and output technology as CMOS and confirms that PLL operation is supported. Detailed electrical limits, supply-voltage operating range, output-to-output skew, input-to-output delay, operating-current consumption, and timing tolerances are not available in the supplied source data and therefore require confirmation against the original manufacturer datasheet before release to production. Typical uses include processor and peripheral clock distribution, data-processing systems, communications equipment, test systems, and other high-speed digital platforms requiring one reference clock to feed four destinations. Because the ICS574M is listed as obsolete, engineers should confirm the available lifecycle status, remaining supply, and any formal last-time-buy or end-of-life schedule with the authorized distributor. The primary design consideration is timing closure. Board traces must be length- and impedance-matched when the four outputs must arrive at their destinations within a tightly controlled interval. Decoupling, grounding, and output loading should follow the original datasheet guidance, while any substitute must be checked for pin assignment, supply voltage, frequency ceiling, skew, and output enable behavior rather than package name alone. This product record combines verified distributor specifications, lifecycle evidence, package information, and practical replacement guidance. It distinguishes documented electrical facts from unavailable parameters, helping engineers identify whether the original ICS574M remains suitable or whether a redesign is required.
ICS613M - Low Phase Noise Clock Multiplier | Renesas
The Renesas Electronics ICS613M is a low-cost, low-phase-noise, high-performance clock synthesizer and clock multiplier in a 16-pin SOIC package. It is positioned for applications requiring low phase noise and low jitter, and the manufacturer describes it as the ICS family's lowest-phase-noise multiplier. The ICS613M belongs to the clock synthesizer and PLL frequency-synthesizer segment of the broader clock and timing IC category. A clock multiplier is a timing IC that derives one or more higher-frequency clock outputs from a lower-frequency reference input. By multiplying the reference frequency while preserving low phase noise, this type of device can support clock trees, communication interfaces, digital processing systems, and mixed-signal equipment. In the electronics hierarchy, the ICS613M is a clock synthesizer, then a clock and timing IC, then an integrated circuit and semiconductor. The primary verified feature of the ICS613M is its low phase-noise performance. Low phase noise is important when clock timing jitter can degrade signal integrity, reduce usable timing margin, or increase data-conversion errors. Its low-cost positioning also makes it relevant to designs that require stable frequency generation without selecting a higher-cost premium clock-generation solution. The available technical data does not provide a numerical phase-noise, jitter, frequency, or supply-voltage rating. The ICS613M is identified as the lowest-phase-noise multiplier within the ICS family, indicating that its clock multiplication architecture was optimized specifically for phase-noise-sensitive designs. Clock multiplication can reduce the need for multiple independent oscillators and allows a system to derive related timing signals from a common reference. Designers must still account for loop stability, reference quality, output-load capacitance, and the multiplication ratio required by the target system when evaluating the device. Typical applications include communications infrastructure, digital signal processing platforms, instrumentation, industrial control systems, and clock-tree generation where a common reference must be converted into additional timing domains. The 16-pin SOIC package supports conventional surface-mount PCB assembly and is suitable for designs that do not require a specialized leadless package. Exact frequency, supply, output, and stability limits must be confirmed from the complete manufacturer datasheet before schematic release. The principal design consideration is verification of operating conditions. The visible verified data confirms the device category, low-phase-noise positioning, clock-multiplier function, and 16-pin SOIC package, but it does not expose the electrical tables needed to select compensation, loop, decoupling, or output components. A design should therefore preserve the 16-pin footprint only after checking the complete pin assignment and confirming all required frequency ratios. This product record consolidates verified distributor availability, manufacturer-described clock performance, package information, application guidance, and honest data gaps into one engineering-oriented resource. It also distinguishes confirmed facts from parameters that still require the full Renesas or legacy ICS datasheet, helping teams accelerate sourcing without turning incomplete search results into unsupported design assumptions.
ICS621MI - 1:4 200MHz Low-Skew Clock Buffer | Renesas
Renesas Electronics ICS621MI is a low-skew 1-to-4 clock fanout buffer rated for 200 MHz operation and supplied in an 8-pin SOIC package measuring 0.154 inch, or 3.90 mm, in body width. The device provides one clock input and four buffered clock outputs for distributing a common timing signal across multiple circuit loads. According to the verified manufacturer and distributor information, its operating supply range is 1 V to 1.8 V, while its input is tolerant of 3.3 V signals. This combination allows it to be used in mixed-voltage clock-distribution networks where a lower-voltage core or peripheral must be driven from a higher-voltage clock source. 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.
ICS651M - 1:4 200MHz Clock Fanout Buffer | Renesas
The Renesas Electronics ICS651M is a 1:4 clock fanout buffer distribution IC designed for clock signals up to 200 MHz, supplied from 1.425 V to 2.625 V and packaged in an 8-SOIC. Its single clock input feeds four clock outputs, making it useful when several digital subsystems must receive a common timing reference. 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.
ICS651MI - 1:4 200 MHz Clock Fanout Buffer | Renesas Electronics
The Renesas Electronics ICS651MI is a low-skew, single-input to four-output clock fanout buffer rated for operation up to 200 MHz, supplied in an 8-SOIC package. Its 1:4 fanout ratio provides one clock distribution function for driving four downstream destinations, while its 1.425 V to 2.625 V supply range supports low-voltage digital clocking systems. The verified distributor and technical listings identify the device as a Clock Fanout Buffer (Distribution) IC with clock input and clock outputs. 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.
ICS651MT - 200MHz 1:4 Clock Buffer | Renesas | 8-SOIC
The Renesas Electronics ICS651MT is a 1:4 fanout clock buffer with a maximum operating frequency of 200 MHz, a 1.425 V to 2.625 V supply-voltage range, and an 8-pin SOIC package. The device accepts one clock input and provides four buffered clock outputs, making it suitable for distributing a low-frequency clock across multiple digital, communications, or embedded-system loads. A clock buffer, also called a clock driver or fanout buffer, is a digital timing IC that reproduces an input clock onto multiple outputs with controlled propagation delay and low output-to-output skew. Clock buffers belong to the clock and timing hierarchy, alongside clock generators, phase-locked loops, jitter cleaners, dividers, and delay lines. Their purpose is to restore signal integrity, isolate the source from capacitive loading, and provide matched clock branches in systems where a single clock cannot directly drive every destination. The ICS651MT is identified as a low-skew, single-input, four-output clock buffer in the ICS ClockBlocks family. Verified specifications list a maximum frequency of 200 MHz, a 1.425 V to 2.625 V supply range, 250 ps skew, and a commercial operating-temperature range of 0 C to 70 C. Its four-output architecture supports economical distribution without implementing four separate discrete buffers. The SOIC-8 package also supports conventional surface-mount manufacturing and inspection processes. Operationally, the buffer preserves the clock waveform while adding fanout capability. The verified datasheet guidance specifies a 0.01 uF decoupling capacitor between VDD on pin 7 and GND on pin 6, placed as close to the device as possible. It also states that a 33 ohm series terminating resistor may be used on each clock output when the trace is longer than 1 inch. These recommendations reduce supply-noise coupling, ringing, and reflections on longer clock routes. Typical uses include processor-clock distribution in embedded equipment, communication-interface clock fanout, general-purpose logic clock distribution, and fanout for digital converters or controllers. Because this is a four-output buffer rather than a clock generator, an external clock source is required. The source must provide a valid clock waveform within the device's specified frequency and supply-voltage limits, and each connected load must be checked for timing margin. The primary design trade-off is output loading versus timing margin. Short, lightly loaded traces may not need source termination, while long PCB routes can develop edge reflections that reduce setup and hold margin. Place the decoupling capacitor at the supply pins, use short output branches, and evaluate rise time, fanout, and skew at the actual operating frequency before releasing the layout. This product page consolidates the verified clock-buffer specifications, application guidance, comparison fields, and practical implementation notes. It distinguishes documented electrical and packaging data from unavailable lifecycle, pricing, and pinout details so engineers can make sourcing decisions without treating unverified values as established facts.
ICS663M - 120MHz PLL Clock Synthesizer | Renesas Electronics
Renesas Electronics ICS663M is a single-circuit phase-locked-loop clock synthesizer with a maximum operating frequency of 120 MHz, a 1:1 input-to-output ratio, and CMOS clock output. The device is supplied in an 8-SOIC surface-mount package measuring 3.90 mm wide and is listed for operation from 3.13 V to 5.5 V. A phase-locked loop, or PLL, is a frequency-control building block that locks an internally generated or controlled clock to a reference signal. Within the clock and timing hierarchy, the ICS663M functions as a PLL building block combining a phase detector, charge pump, voltage-controlled oscillator, and output buffer. This allows an external timing loop to synthesize or synchronize a stable CMOS clock rather than relying only on a free-running oscillator. The verified product information identifies the ICS663M as a low-cost PLL intended for clock synthesis and synchronization. Its principal documented parameters include one PLL circuit, one clock input, one CMOS output, no differential input or output, a 1:1 input-to-output division ratio, and operation up to 120 MHz. The 8-SOIC package provides a compact surface-mount option for clock-generation and timing circuits. The PLL architecture makes external loop filtering an important part of the application circuit. External components can establish loop bandwidth, damping, and phase-error behavior, which influence jitter, acquisition time, and reference-clock rejection. Actual performance therefore depends on the external loop network, reference frequency, output loading, supply quality, and board layout rather than only on the nominal 120 MHz maximum. Typical applications include reference-clock multiplication, synchronization of communications equipment, generation of a derived system clock, and recovery or conditioning of a timing signal. The ICS663M is also suitable for industrial instrumentation, test equipment, and embedded systems that require a phase-locked CMOS clock but do not require a highly integrated programmable clock generator. Designers should provide stable supply and reference-clock connections, follow the manufacturer’s recommended loop-filter topology, and use short return paths for clock and ground. Because an 8-SOIC footprint is compact, trace geometry and capacitance control become important when maintaining signal integrity at higher clock rates. This page combines verified distributor and manufacturer-linked product information with practical PLL design guidance, transparent comparison data, and availability details. It distinguishes documented parameters from engineering values that still require confirmation from the Renesas datasheet before schematic release or production qualification.
ICS722M - 28MHz 3.3V CMOS VCXO | Renesas Electronics
Renesas Electronics ICS722M is a 28 MHz voltage-controlled crystal oscillator, or VCXO, with a 3.3 V power supply, CMOS output, and 8-pin SOIC surface-mount package. The device is a low-cost, low-jitter oscillator intended to replace discrete VCXO modules while providing integrated frequency-control functionality in a compact surface-mount footprint. Its nominal operating frequency is 28 MHz, with source material also identifying the product as a 27 MHz-class VCXO; the exact nominal-frequency wording should therefore be confirmed against the manufacturer datasheet before release. A voltage-controlled crystal oscillator is a frequency-control IC built around a crystal resonator and an adjustable oscillator circuit. A VCXO belongs to the broader oscillator hierarchy, which includes crystal oscillators, frequency dividers, clock generators, phase-locked loops, and timing ICs. Unlike a fixed-frequency crystal oscillator, a VCXO permits its output frequency to be adjusted within a manufacturer-specified control range, making it useful when small frequency corrections are required for clock synchronization, filtering, or signal conversion. The supplied product information identifies the ICS722M as a low-cost, low-jitter, high-performance 3.3 V VCXO with a CMOS output. It is available in an 8-SOIC package and is listed in tube packaging by one distributor. Its single-oscillator architecture supports applications requiring one independently adjustable clock rather than a multi-output PLL or clock-generator network. The 3.3 V supply operation also allows integration with 3.3 V CMOS logic without a level-shifting stage when the associated interface voltage levels are compatible. The IC accepts a crystal input according to the distributor specification summary and produces one CMOS clock output. This arrangement separates the stable resonant element from the voltage-controlled oscillator circuitry, supporting accurate frequency generation with electrical tuning capability. The exact tuning range, control sensitivity, initial frequency accuracy, temperature stability, RMS jitter, operating-temperature range, output load requirements, and supply-current limits are not stated in the supplied source data and must be obtained from the manufacturer datasheet before production design. Typical uses include communications-clock recovery, frequency conversion, tunable oscillator modules, digital signal-processing clock trees, and embedded systems that need a small frequency adjustment around a crystal reference. In such designs, the control voltage should remain within the datasheet-specified tuning range, and the output must be properly terminated for reliable CMOS rise and fall times. The compact SOIC-8 package also makes the device suitable for lead-free surface-mount assembly, subject to the manufacturer’s recommended reflow profile and package qualification data. The primary design consideration is that voltage-controlled frequency adjustment is not interchangeable with wholesale frequency synthesis. The ICS722M offers a tuning function around its crystal frequency, whereas a PLL-based clock generator provides programmable multiplication and division. Engineers should compare pull range, sensitivity, jitter, phase noise, supply noise rejection, and load capacitance against the timing budget rather than selecting only by the 28 MHz headline frequency. This page consolidates distributor inventory, package, voltage, output, and oscillator-class information with a traceable source list, practical application guidance, and clearly documented data gaps. It also distinguishes verified product facts from parameters that require confirmation from the Renesas or original IDT manufacturer datasheet.
ICS728M Clock & Timing IC | Technical Overview
The Renesas Electronics ICS728M is an integrated clock and timing component associated with the ICS family of timing ICs. The supplied verification data did not include a manufacturer datasheet, product page, distributor listing, or confirmed technical parameter table, so its operating frequency, supply voltage, output configuration, package, pinout, and lifecycle status cannot be stated responsibly. This page therefore distinguishes confirmed identification from parameters that still require manufacturer-document verification. A clock and timing IC is an integrated circuit used to generate, distribute, condition, or select clock signals within electronic systems. Such devices belong to the semiconductor hierarchy and ultimately support digital logic, communications, industrial control, consumer equipment, and data-processing systems. An ICS-series timing device may provide multiple outputs, programmable frequencies, low-jitter operation, or specific clock-generation functions, but no verified evidence in the supplied dataset establishes which capabilities apply to the ICS728M. The primary engineering parameters to verify include the nominal input reference frequency, supported output frequencies, number and type of output clocks, supply-voltage range, jitter performance, temperature range, and package dimensions. Because none of these values were returned by the failed real-time search, this record does not infer them from similarly named ICS devices. Obtain the manufacturer datasheet and ordering information before sizing decoupling, setting filtering components, or designing a replacement board. Clock-integrity analysis also depends on whether the device is intended as a source, a jitter cleaner, a buffer, a synthesizer, or a distribution element. The verified results contained no functional block diagram or application circuit, so the exact architecture and supported use cases remain unconfirmed. Engineers should review the recommended reference circuit, output-load limits, termination guidance, and power-supply sequencing requirements directly in the applicable manufacturer documentation. Potential design locations for a clock and timing IC include processor clocking, communication-interface timing, data-conversion systems, and embedded control platforms. These are category-level use cases only and are not a claim that the ICS728M supports every listed architecture. Final suitability must be established by matching the verified clock-frequency range, supply rails, I/O standards, jitter budget, package footprint, and environmental requirements to the target design. The most important design precaution is to avoid assuming pin compatibility from the MPN suffix alone. Before procurement or substitution, verify the exact package marking, lead assignments, exposed-pad requirements, maximum supply voltage, output drive, and reference-circuit values. A same-family name or similar distributor listing is not sufficient evidence of a drop-in replacement. This record adds information beyond an unstructured search-result list by documenting the verification gap, the parameters required for engineering review, and the evidence needed before selecting alternatives. It also supports honest procurement comparisons without presenting unverified clock specifications, prices, pin assignments, or drop-in claims as fact.
IS82C54Z96 - 8MHz CMOS Programmable Interval Timer | Renesas
The Renesas IS82C54Z96 is a CMOS Programmable Interval Timer manufactured using an advanced 2 micron CMOS process, supplied in a 28-pin PLCC package. It supports clock input frequencies up to 8 MHz and operates from a 4.5 V to 5.5 V single supply. According to the Renesas 82C54 datasheet, the device integrates three independently programmable and functional 16-bit counters, each capable of binary or BCD counting and of handling clock inputs up to 8 MHz (82C54), 10 MHz (82C54-10), or 12 MHz (82C54-12). A programmable interval timer (PIT) is a counter IC that generates precise time delays, event counting, and frequency-division functions under software control. As a category, the 82C54 sits within the broader timer/counter IC family, which in turn belongs to clock and timing semiconductors, bridging discrete counters, real-time clocks, and microcontroller peripherals. The IS82C54Z96 is the industrial temperature range variant, distinguished by the Z96 suffix indicating 28-PLCC packaging on tape-and-reel. Key features of the IS82C54Z96 include six programmable counter modes (Mode 0 interrupt on terminal count, Mode 1 hardware retriggerable one-shot, Mode 2 rate generator, Mode 3 square wave generator, Mode 4 software-triggered strobe, and Mode 5 hardware-triggered strobe), three independent 16-bit down counters, read-back command for inspecting counter latches and status, and CMOS low-power operation. The 82C54 is the CMOS successor to the original Intel 8254/8253 NMOS parts, maintaining full software compatibility while delivering lower power consumption. Typical applications include industrial control event counting, motor speed measurement via frequency division, baud-rate generation for legacy serial ports, programmable pulse generation for stepper motor drive signals, and embedded system timing in PC/104, VME, and CompactPCI single-board computers that still integrate the classic x86 peripheral set. The wide industrial operating temperature range of -40 C to +85 C and the robust CMOS process make it well suited for factory floor installations. When designing with this part, ensure the read and write strobes (RD, WR) and the chip-select logic follow the standard 82C54/8254 control-word protocol. Each counter must be initialized with a control word before being loaded with a count, and back-to-back LSB/MSB reads of a 16-bit count are required to guarantee coherent data. The -Z96 suffix on the Renesas ordering code designates the industrial temperature grade and the tape-and-reel packaging option.
LM-555N - Single 555 Timer, 8-PDIP | Texas Instruments
The Texas Instruments LM-555N is a single 555-type timer and oscillator integrated circuit packaged in an 8-pin PDIP. The verified distributor result identifies it as an 8-PDIP device from Harris Corporation, while the official TI family page identifies the LM555 as a highly stable 555 timer. The target MPN is therefore associated with the classic timer functionality, but the supplied data does not provide verified electrical ratings, timing limits, temperature range, or lifecycle details for the exact LM-555N ordering code. What is a 555 timer? A 555 timer is a programmable timer and oscillator integrated circuit used to generate delayed pulses, produce periodic waveforms, debounce inputs, or control relays and indicators. Its internal blocks typically include a voltage reference, comparators, a flip-flop, and a high-current output stage. In astable operation, external resistors and a capacitor set the oscillation period; in monostable operation, an external timing capacitor sets the output pulse width. The verified Harris product description identifies the LM555N for timing-delay and oscillator applications in commercial, industrial, and military equipment. The verified product listing calls it a “555 Type, Timer/Oscillator (Single) IC” and specifies an 8-PDIP package. The official TI product page describes the LM555 family as a highly stable 555 timer and provides family-level documentation, but the supplied material does not expose the exact LM-555N datasheet values. Because the target MPN includes a hyphen while the verified distributor listing uses LM555N, engineers should confirm the exact package, suffix, manufacturer, and electrical limits against the applicable manufacturer documentation before substituting or releasing a production design. The verified result also shows a distributor listing from Rochester Electronics under the Harris Corporation name; Harris Corporation is not in the supplied Manufacturer Reference, so the brand field follows the target context and the official TI source uses Texas Instruments. Typical uses include pulse generation, delay circuits, oscillators, indicator flashing, switch debouncing, and simple industrial control logic. Because the exact pinout, package details, and ratings were not included in the verified data, this page does not infer those values. Check the original LM-555N datasheet and the manufacturer’s current documentation before layout or purchase.
LM555CM - 100kHz Single Timer | Texas Instruments | 8-SOIC
Texas Instruments LM555CM is a single 555-type timer and oscillator integrated circuit with a maximum frequency of 100 kHz, supplied in an 8-pin SOIC package. The device operates from 4.5 V to 16 V and supports both astable and monostable operation. Its timing can extend from microseconds to hours, while an external resistor and capacitor establish the relevant timing interval. The LM555/NE555/SA555 family is a widely recognized type of programmable timer and pulse generator used when a circuit requires controllable delay, repetition, or oscillation. A 555 timer is an analog timing block containing voltage thresholds, comparators, a flip-flop, discharge control, and an output stage. In astable mode, the output repeatedly switches between two voltage levels and the external timing network determines both the charging and discharging intervals. In monostable mode, the circuit produces one timed output pulse after a trigger. This LM555CM combines that established function with TTL-compatible interfacing and output-current capability, making it suitable for conventional digital control and timing systems. The verified operating range is 4.5 V to 16 V, and the listed maximum oscillator frequency is 100 kHz. The controller can source or sink up to 200 mA according to the manufacturer feature summary. Its timing-temperature stability is specified as 0.005%/°C, and the turn-off time is less than 2 µs. The SOIC-8 format permits conventional surface-mount assembly, while the available part information identifies the device as suitable for industrial control, pulse generation, delay, and oscillator implementations. Technically, the LM555CM is controlled by an external RC timing network rather than a digital register or crystal. In astable operation, the timing capacitor charges and discharges through external resistors while the internal thresholds determine when the output changes state. Duty cycle is adjustable, although the exact permitted resistance and capacitance combinations depend on the manufacturer timing equations. Because this is a classic analog timer rather than a precision digital synthesizer, its accuracy depends on component tolerances, temperature, supply stability, and the timing network. Typical uses include industrial pulse and delay circuits, LED flashers, debounce timers, basic clock generators, motor or relay timing, and laboratory test fixtures. The 200 mA output-drive capability can directly support compatible loads, while the 4.5 V minimum supply keeps the device compatible with common 5 V logic systems. The 16 V maximum rating also supports higher-voltage control designs when the surrounding circuit remains within the device ratings. When laying out a LM555CM circuit, place the timing capacitor and timing resistors close to their associated pins and keep the control-node bypass capacitor connection short. Decouple the supply rail near the IC, avoid long current-loop paths, and verify that reset and trigger levels satisfy the input thresholds. The unused voltage and control pins should be connected according to the manufacturer guidance, and output loads must remain within the verified drive limits. This product record combines verified manufacturer and distributor specifications, practical timer design guidance, package and pin information, and sourced drop-in alternatives. It is intended to help engineers identify the LM555CM quickly, compare equivalent SOIC-8 timers, and assess whether its 4.5 V to 16 V supply range and 100 kHz frequency capability fit the intended astable or monostable circuit.
LM555CN - 100kHz Single Timer | DIP-8 | Timing Control
The Texas Instruments LM555CN is a single 555-type timer and oscillator IC operating from 4.5 V to 16 V, with a maximum timing frequency listed as 100 kHz, in an 8-pin through-hole DIP package. It generates accurate timing pulses in monostable or astable configurations and includes trigger and reset terminals for external control. A 555 timer is a general-purpose timing controller within the broader clock and timing IC category. Its internal architecture combines a voltage reference, voltage comparators, a flip-flop, and a high-current output stage. Two resistors and one capacitor set the astable frequency and duty cycle, while one resistor and one capacitor set the monostable pulse delay. Key verified characteristics include a 4.5 V to 16 V supply range, a maximum frequency of 100 kHz, TTL-compatible interfacing, and support for both astable and monostable operation. The LM555CN is supplied as an 8-DIP device, matching the classic through-hole timer footprint and making it suitable for legacy control boards, educational hardware, prototypes, and repair applications. In astable mode, the output oscillates continuously between two threshold levels set by the external timing network. In monostable mode, a low-going trigger starts one timing cycle and produces a timed output pulse. The reset input can force the timer into its stable state, while the output stage provides the drive needed for standard digital logic loads. Typical applications include pulse generation, delay circuits, oscillators, debounce timers, PWM generation, LED flashers, and industrial control pulse shaping. Because the DIP package exposes all eight pins, the device is also convenient for breadboard prototyping and timing experiments where a surface-mount package would be inconvenient. When designing a replacement circuit, verify trigger polarity, output polarity, output-drive requirements, and timing tolerance rather than assuming every 555 variant is electrically identical. CMOS alternatives may have lower supply current but different output-drive and timing characteristics, while bipolar alternatives generally provide stronger output sourcing and sinking capability. This page combines the verified LM555CN supply, package, frequency, and timing-mode information with same-footprint alternatives, application guidance, and practical selection criteria that are not consolidated in a single manufacturer datasheet.
LM556CM - Dual 555 Timer | Fairchild | Industrial
The Fairchild Semiconductor LM556CM is a dual 555-type timer and oscillator integrated circuit packaged in a 14-SOIC. It operates from 4.5 V to 16 V, supports timing or oscillation functions up to 3 MHz, and provides TTL-compatible normally on and normally off outputs. The device combines two independent timer sections in one package, reducing component count in circuits that require two adjustable time intervals or dual-frequency outputs. A 555-type timer is a programmable timing IC that can operate as an astable oscillator or a monostable pulse generator. In astable mode, external resistors and a capacitor establish repetitive switching, while the output produces a continuous waveform. In monostable mode, a trigger starts one timed output pulse. The LM556CM places two such timer functions in a single 14-SOIC package, making it useful where PCB area is constrained. The principal verified specifications include a 4.5 V to 16 V supply range, operation up to 3 MHz, and TTL-compatible normally on and normally off outputs. The dual architecture allows both timer sections to be used together or independently. Its 14-SOIC package is a surface-mount package compatible with conventional automated PCB assembly, although exact board dimensions and pin mapping must be confirmed against the selected manufacturer datasheet before layout. The LM556CM combines two classic 555-type timing blocks with separate timing and output functions. Its operating range supports conventional 5 V and 12 V system rails, while the stated upper limit of 16 V provides additional design headroom. The 3 MHz maximum operating frequency identifies it as a general-purpose timing solution rather than a precision real-time-clock or low-frequency timer. Typical uses include industrial pulse generation, retriggerable delay circuits, dual-tone generation, LED flashers, motor or solenoid timing, test equipment, and general control systems. Two timers in one package can simplify designs that need independent delays, complementary pulse outputs, or two adjustable waveforms while reducing the number of external IC footprints. Circuit design should account for timing-component tolerances, supply decoupling, output loading, and the required trigger and reset levels. Because the verified data identifies the package and core ratings but does not provide a complete pin map or detailed output-current limits, engineers should verify those details in the manufacturer datasheet for the exact branded source being procured. This page consolidates verified distributor data, source links, package information, drop-in sourcing alternatives, and practical selection guidance. It is designed to support faster engineering comparison while clearly identifying specifications that require confirmation from the exact manufacturer datasheet.
LM556CN - Dual Timer, 4.5-16V, 14-DIP | onsemi
The onsemi LM556CN is a dual-programmable timer integrated circuit containing two independent 555-compatible timer sections in a 14-pin DIP package. It operates from 4.5 V to 16 V, supports both astable and monostable operation, and provides timing intervals ranging from microseconds to hours. Each timer uses an external resistor and capacitor to establish its timing characteristics, allowing one package to replace two separate single timers. A dual timer is a timing and oscillator IC that generates controlled time delays or periodic waveforms. Within the product hierarchy, the LM556CN belongs to the timer and oscillator class, the clock and timing category, and ultimately the broader semiconductor and integrated-circuit ecosystem. Its two timer sections can operate independently, making it useful when a design needs two related timing functions without allocating two separate packages. Verified device features include operation in both astable and monostable modes, high output current with TTL compatibility, adjustable duty cycle, and temperature stability of 0.005% per degree Celsius. The specified supply range of 4.5 V to 16 V supports both conventional 5 V logic systems and higher-voltage industrial control environments. Many operating characteristics apply from 0°C to 70°C, as stated in the manufacturer datasheet. Each internal timer includes threshold, trigger, output, reset, discharge, and control functions. In monostable mode, the circuit produces one timed pulse after a trigger event. In astable mode, it repeatedly charges and discharges an external timing capacitor and drives an output waveform. The output stage can sink and source relatively high current and remains TTL compatible, reducing the need for added output-driver circuitry in many applications. Typical uses include industrial pulse and delay generation, LED and indicator flashing, periodic sampling triggers, simple clock or oscillator circuits, and two-channel debounce or delay systems. The DIP-14 package also supports through-hole insertion and replacement of two discrete 555 timers, although legacy DIP construction should be considered for new compact designs. Designers should preserve the timing-capacitor and timing-resistor connections near the appropriate IC pins and account for temperature and supply sensitivity when setting long delays. Decoupling should minimize supply disturbances, while reset and trigger signals require suitable logic levels and clean transitions. Verify the exact pin functions and electrical limits in the manufacturer datasheet before layout or production use.