MK2304S-1LF - 133MHz Zero-Delay Clock Buffer | Renesas
MPN: MK2304S-1LF ✓ ActiveMK2304S-1LF Overview
A zero-delay buffer is a clock and timing integrated circuit that reconstructs and buffers a periodic logic waveform while attempting to minimize added propagation delay. In the broader hierarchy, it belongs to clock buffers and drivers, then clock and timing ICs, then integrated circuits and semiconductors. Unlike a passive fan-out buffer, it combines active input and output stages with circuitry designed to preserve clock-edge relationships and provide useful drive capability.
Verified distributor information identifies the MK2304S-1LF as a zero-delay buffer with a maximum frequency of 133 MHz, a single circuit, a 1:4 input-to-output ratio, CMOS output technology, and PLL capability. Its 8-SOIC package supports conventional surface-mount assembly, while the -1LF ordering suffix identifies the lead-free packaging configuration. These characteristics make the device relevant to clock-distribution networks, processor and memory interfaces, communication equipment, and general digital systems requiring multiple or isolated clock outputs.
The active circuit is intended to reduce loading on the source clock and distribute a clean CMOS waveform. A 1:4 ratio means the device provides four output phases for each input cycle, which is useful when several downstream blocks must receive related clocks. The exact propagation-delay, output-skew, rise-time, fall-time, supply-current, and operating-temperature limits must be confirmed in the Renesas manufacturer datasheet before a design is released.
Typical uses include processor clock distribution, memory clock buffering, communication-interface clock fan-out, and digital test-equipment clock trees. In each case, the key design concern is preserving edge-to-edge relationships while keeping source loading and interconnect-induced skew under control. The 133 MHz upper frequency provides a useful qualification point for legacy and moderate-speed digital systems.
Designers should place the device close to the clock source, use short and properly terminated clock traces, and verify the output timing at the receiving endpoints rather than relying only on device-level specifications. Decoupling and return-path continuity are also essential because inductive power-supply noise and imperfect grounding can degrade deterministic clock quality.
This page consolidates the verified distributor specifications, current sourcing information, package details, selection guidance, and design cautions for the MK2304S-1LF. It also distinguishes verified drop-in candidates from unverified package or frequency assumptions so engineers can make a defensible replacement decision.
Drop-in alternatives for MK2304S-1LF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
MK2304S-2ILFTR
✅ Drop-In📋 Reference alternative (not in catalog)
MK2304S-1IT
✅ Drop-In📋 Reference alternative (not in catalog)
2304NZG-1LF
✅ Drop-In📋 Reference alternative (not in catalog)
MK2304S-1LF Specifications
| Product Type | Zero-delay, low-skew buffer |
| Maximum Frequency | 133 MHz |
| Number of Circuits | 1 circuit |
| Input-to-Output Ratio | 1:4 |
| Input Signal Type | Clock |
| Output Technology | CMOS |
| PLL | Yes |
| Supply Voltage | 3 V to 3.6 V |
| Package | 8-SOIC, 0.154 inch (3.90 mm) width |
| Mounting Type | Surface mount |
| Datasheet Page Count | 9 pages |
| Datasheet File Size | 253 kbytes |
| Device Marking | 2304S-1L |
MK2304S-1LF 8-soic, 0.154 inch (3.90 mm) width Pin Configuration Guide
Pin configuration for MK2304S-1LF (8-soic, 0.154 inch (3.90 mm) width package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for MK2304S-1LF.
Refer to the datasheet for full pin configuration.
Typical Applications
MK2304S-1LF is suitable for 6 applications: Processor Clock Distribution, Memory Clock Buffering, Communication Equipment Clock Fan-Out, Digital Test and Measurement Equipment, Industrial Control Logic, Legacy Synchronous Logic.
Processor Clock Distribution
The MK2304S-1LF fits a processor clock-distribution point that requires up to 133 MHz operation and four related outputs from one clock source. Its verified 1:4 input-to-output ratio allows one clock input to feed several destinations while the active zero-delay buffer reduces the loading presented to the oscillator. The designer should verify the complete processor clock specification, including cycle-to-cycle jitter, rise and fall times, and board-level skew, against the Renesas timing data. Placement close to the clock source, short traces, solid ground planes, and local decoupling remain important because a nominal 133 MHz rating alone does not guarantee acceptable timing at the load pins.
Recommended
Memory Clock Buffering
The MK2304S-1LF is applicable to a memory clock tree that operates at or below the verified 133 MHz maximum and needs one-to-four clock distribution. The CMOS output stage can isolate the source clock from several memory-controller loads, reducing the risk that one long or capacitive route prevents the remaining destinations from receiving usable signals. The critical design checks are output-edge quality, propagation delay, output skew, and the allowable clock-input duty cycle. PCB trace-length matching and termination may matter more than raw buffer bandwidth, so engineers should measure skew at the actual memory device rather than assume that equal schematic lengths guarantee acceptable timing.
Recommended
Communication Equipment Clock Fan-Out
The MK2304S-1LF can distribute a reference clock through a communication module when the operating rate remains within the verified 133 MHz limit. Its single clock input and 1:4 output ratio support a source clock feeding four related destinations, such as interface, conversion, or digital-control blocks. The zero-delay-buffer description indicates an attempt to minimize added latency, while the low-skew positioning is useful when multiple phases must retain predictable relationships. A production design must still account for source jitter, accumulated board skew, capacitive loading, and supply sensitivity. Controlled-impedance routing and an uninterrupted return path are therefore necessary even though the component itself is specified for only a 3 V to 3.6 V supply range.
Recommended
Digital Test and Measurement Equipment
The MK2304S-1LF is suitable for clock-distribution sections of legacy digital test equipment operating below 133 MHz. Four outputs from a single input can feed counters, capture logic, programmable dividers, or interface stages while reducing source loading. Because instrumentation timing margins may be narrow, the designer should obtain the manufacturer’s propagation-delay and output-skew limits and evaluate them together with fixture and cable delays. Short traces, symmetric routing, and local clock decoupling help prevent the buffer from becoming the dominant source of edge displacement. The verified 8-SOIC footprint also supports conventional PCB assembly, but pin labels must be taken directly from the Renesas datasheet before schematic capture and layout release.
Recommended
Industrial Control Logic
The MK2304S-1LF can serve a 133 MHz-or-lower control-logic clock tree in industrial equipment where one oscillator must drive several digital subsystems. Its verified 1:4 ratio and CMOS outputs provide a compact way to organize clock routing and reduce source loading. Industrial designs should examine the manufacturer’s operating-temperature limits because those values are not available in the supplied search excerpts, and they should include power-supply noise filtering in the clock-quality budget. A solid ground plane, short output routes, and placement near the clock source help minimize radiated and conducted sensitivity. Any proposed replacement should be checked for identical pin mapping and timing because the cross-reference data does not establish universal compatibility.
Recommended
Legacy Synchronous Logic
The MK2304S-1LF supports legacy synchronous-logic designs whose clock frequency is no greater than the verified 133 MHz maximum and whose CMOS logic can use a 1:4 clock relationship. Active buffering can reduce sensitivity to long-trace loading while providing four output branches for sequential blocks. The relevant selection criteria are not limited to frequency: propagation delay, output skew, duty-cycle distortion, and supply-current behavior determine whether the device preserves the intended system timing. Engineers should verify these parameters in the Renesas manufacturer datasheet and perform endpoint measurements after PCB assembly. If substituting another MK2304-series device, the footprint, pin names, output ratio, and timing limits must all be confirmed rather than inferred from the ordering suffix.
Recommended
Engineering reference data for MK2304S-1LF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MK2304S-2ILFTR | MK2304S-1IT | 2304NZG-1LF |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - requires datasheet confirmation | 8-SOIC - requires datasheet confirmation | 8-SOIC - requires datasheet confirmation |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
Key Differentiators
- Verified clock-distribution ratio (vs MK2304S-2ILFTR)
- Documented 133 MHz operating point (vs MK2304S-1IT)
- Verified single-circuit CMOS architecture (vs 2304NZG-1LF)
Design Notes
Place the MK2304S-1LF close to the source clock and route outputs to destinations with matched topology. Keep the clock traces short, use a continuous reference plane, avoid stubs and unnecessary test-pad branches, and match output path lengths when the system has a meaningful skew budget. Because the supplied data verifies 133 MHz maximum frequency but does not expose output-skew limits, endpoint timing measurements are essential before treating the routing as production-ready.
The verified supply range is 3 V to 3.6 V, so the clock rail must remain within those limits under every operating condition. Place local high-frequency decoupling at the device supply pins, maintain a low-impedance ground connection, and inspect the datasheet for required capacitor values and stability recommendations. The verified excerpts do not provide quiescent current or output drive strength, so those values should not be inferred when designing the power tree.
Do not assume that a similarly named Renesas ordering code is automatically a drop-in replacement. Before substituting MK2304S-2ILFTR, MK2304S-1IT, or 2304NZG-1LF, compare the 8-SOIC pin map, supply range, 1:4 output ratio, 133 MHz-class frequency requirement, propagation delay, and output skew. The supplied cross-reference results identify these candidates but do not provide enough manufacturer-level data for unconditional substitution.
Compliance Information
The -LF ordering suffix indicates a lead-free package configuration according to the supplied ordering information. No explicit RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals statement appears in the verified search data. The AEC-Q100 field is retained as unknown because the available schema requires an extracted value rather than an assumption.
