MK2304S-2ILF - 133MHz 3.3V PLL Zero Delay Buffer | Renesas
MPN： MK2304S-2ILF ✓ 啟用中MK2304S-2ILF 概覽
A zero delay buffer is a clock distribution device that regenerates a clock through an internal phase-locked loop rather than passing it through a simple buffer. Because the output edge is re-timed by the PLL instead of following the input edge through a fixed propagation delay, the device can drive multiple loads across a board while presenting a single, consistent clock reference to the receiver. In the zero delay mode of operation, the rising edge of the input clock appears at the outputs with essentially no added latency, which matters when source-synchronous interfaces must be aligned.
Key features of the MK2304S-2ILF include a maximum operating frequency of 133 MHz at 3.3 V, four independent low-skew outputs, and the dedicated 1/2X output bank for divide-by-two clocking without an external divider. The device is based on the manufacturer's proprietary low-jitter PLL techniques, which is the core technology that separates it from simple fan-out buffers in jitter performance.
Internally, the PLL architecture re-times the reference clock and drives the output bank, so output edges depend on the internal loop rather than on logic gate delay. This gives cycle-to-cycle jitter that is independent of the number of loads on each output and largely independent of board loading, which is the primary reason designers move from a plain buffer to a PLL-based part when skew or jitter budgets are tight.
Typical applications include networking and telecom line-card clock trees, server and storage backplane clock distribution, processor and FPGA clock fan-out, and general-purpose frequency multiplication or division for system timing. The 1/2X bank is useful in designs that need a divided clock for lower-speed peripherals alongside full-rate outputs for the main datapath.
When designing around this device, treat the PLL as a sensitive analog block: route the reference clock over a short, continuous trace to pin 1, keep the supply decoupling capacitor close to the VDD pins, and leave the unused output channels terminated according to the datasheet guidance to avoid unnecessary dynamic current. Confirm the final edge budget in system, because board skew and load mismatch add to the device's own output skew.
This page consolidates the manufacturer datasheet details, drop-in replacement candidates, comparison data and practical layout notes in one place, so you can qualify the part quickly and plan the clock tree before the first schematic review.
直接替換替代品，適用於 MK2304S-2ILF — 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： MK2304S-2ILF （相同外形與佔位） — 差異在於 Maximum Frequency, Package, Device Type, Number of Circuits, PLL.
MK2304S-2TR
✅ 直接替換聯絡詢價
查看資料表 →MK2304S-2ILFTR
✅ 直接替換📋 參考替代品（不在目錄中）
MK2304S-01ILF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MK2302S-01TR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →CY2304SI-2T
✅ 直接替換📋 參考替代品（不在目錄中）
MK2304S-2ILF 規格
| Device Type | Zero Delay Buffer (PLL-based) |
| Maximum Frequency | 133 MHz |
| 供應電壓 | 3.3 V |
| 輸出數量 | 4 |
| Output Ratio Bank | 1/2X (two outputs) |
| 封裝 | 8-pin SOIC, 0.154 in (3.90 mm) width |
| 安裝類型 | Surface Mount |
| Technology | Proprietary low-jitter PLL |
| Operating Mode | Zero delay (input rising edge at outputs) |
| Input Clock Type | Single-ended reference clock |
MK2304S-2ILF 8-pin soic, 0.154 in (3.90 mm) width 腳位配置指南
MK2304S-2ILF（8-pin soic, 0.154 in (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： MK2304S-2ILF.
請參閱 資料表 以查看完整腳位配置。
典型應用
MK2304S-2ILF 適用於 6 應用s: Networking Line-Card Clock Distribution, Processor and FPGA Clock Fan-Out, Server and Storage Backplane Clocking, Telecom and Industrial Timing Hub, Audio and Instrumentation Master Clock, Consumer and IoT Clock Hub.
Networking Line-Card Clock Distribution
The MK2304S-2ILF fits line-card clock trees that must feed several low-skew destinations from one reference. Its four outputs to 133 MHz at 3.3 V let a PHY, a transceiver control block and a microcontroller share a single regenerated clock, and because the internal PLL re-times the edge rather than passing it through a gate, output-to-output skew stays constant regardless of how many loads each output drives. The dedicated 1/2X bank provides a divided clock for lower-rate management logic without adding a divider. A practical benefit on a crowded backplane is that each output behaves as an independent low-impedance source, which reduces the sensitivity of the clock to trace length mismatch.
推薦
Processor and FPGA Clock Fan-Out
When a processor, an FPGA and a memory controller must launch from a common edge, the MK2304S-2ILF delivers the same 133 MHz class of clock to all of them with near-zero added latency. The zero delay characteristic means the rising edge of the reference clock appears at the outputs essentially simultaneously, so source-synchronous interfaces that rely on edge alignment do not need to be de-skewed in fabric. Running from 3.3 V also places the device on the same rail class as mainstream logic in these platforms. Because the PLL-based architecture makes output edges independent of load, fan-out to two or three receivers does not degrade the effective clock as it would with a simple buffer.
推薦
Server and Storage Backplane Clocking
Backplane and storage controllers on a server board often need one reference clock reproduced to several destinations with tight relative timing. The MK2304S-2ILF regenerates the clock through a PLL at up to 133 MHz at 3.3 V, which keeps output-to-output skew controlled even when one output drives a long trace into a connector and another drives a short on-chip load. The two 1/2X outputs cover the halved-rate domains that occur where a slower link PHY sits next to a faster core clock. An additional engineering benefit is that the PLL output behaves like a low-impedance driver, so receiver termination can be matched once for the whole clock net instead of per destination.
推薦
Telecom and Industrial Timing Hub
Telecom line equipment and industrial controllers frequently combine a fast digital datapath with a slower supervisory channel on the same card. The MK2304S-2ILF supports this by delivering 133 MHz at 3.3 V on the main outputs while its 1/2X bank feeds the slower domain, keeping both derived from the same PLL and therefore phase-coherent. Phase coherence matters when a supervisory interface and a datapath need a common time reference for correlation or fault isolation. The 8-pin SOIC footprint also keeps the clock section compact on densely populated line cards, where every square millimetre of board area competes with routing resources.
推薦
Audio and Instrumentation Master Clock
Precision audio and test equipment need a master clock that is stable in frequency and clean in jitter. The MK2304S-2ILF re-times the reference through a low-jitter PLL at up to 133 MHz at 3.3 V, and the regenerated edges do not inherit the load-dependent delay and distortion of a passive fan-out network. Its 1/2X outputs are handy in instrumentation architectures that run a fast converter clock alongside a half-rate interface clock, for example a 44.1 kHz-family pipeline clocked from a divided reference. The part is not a jitter-attenuator for audio-rate sources, but it is well suited to the digital master-clock distribution stage that follows a crystal oscillator or an upstream PLL.
推薦
Consumer and IoT Clock Hub
In IoT and consumer devices, a single low-cost reference clock often has to feed a wireless radio, a microcontroller and a sensor interface. The MK2304S-2ILF provides four outputs to 133 MHz at 3.3 V from a single 8-pin SOIC, so a board can expand one oscillator into a small clock tree without adding a second oscillator or a multi-output buffer module. Its 1/2X bank supports the slower sensor and always-on subsystem, and the low pin count keeps the footprint small in wearables and compact home devices. For designs where cost dominates and the clock budget is loose, a simple buffer remains sufficient; this part earns its place where multiple derived domains must stay phase-aligned to one reference.
推薦
推薦產品摘要
工程參考資料，適用於 MK2304S-2ILF — 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 | MK2304S-2T | MK2304S-2ILFTR | MK2304S-01ILF | MK2302S-01TR | CY2304SI-2T |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Infineon Technologies |
| Package | SOIC-8 (0.154", 3.90 mm width) | SOIC-8 (0.154", 3.90 mm width) - same | SOIC-8 (0.154", 3.90 mm width) - same | SOIC-8 (0.154", 3.90 mm width) - same | SOIC-8 - same | SOIC-8 - same |
| Device Type | PLL-based zero delay buffer | PLL-based zero delay buffer - same | PLL-based zero delay buffer - same | PLL-based zero delay buffer - same | PLL-based zero delay buffer - same | PLL-based zero delay buffer - same |
| Number of Outputs | 4 | 4 | 4 | 4 | 4 | 4 |
主要差異化特點
- Integrated divide-by-two output bank removes an external divider from the clock tree (對比CY2304SI-2T)
- Same-family drop-in options cover temperature grade and packing without a redesign (對比MK2304S-2T)
- Single 8-pin SOIC footprint handles four full-rate outputs plus two divided outputs (對比MK2302S-01TR)
- PLL re-timing keeps output skew independent of output loading (對比CY2304SI-2T)
設計說明
Route the reference clock to the input pin as a short, continuous 50-ohm-controlled trace with no stubs, vias or test pads. Because the internal PLL re-times the edge, any crosstalk or reflection on the input trace appears directly as jitter and as cycle-to-cycle noise on all four outputs simultaneously. If the source is a crystal oscillator, keep the oscillator loop on the same side of the board and isolate the clock trace from switching regulators.
Do not treat the two 1/2X outputs as ordinary clock outputs. Their divide ratio is fixed in hardware, so any design that needs a different ratio requires either a separate divider or a different family member. Verify each output's configured ratio against the pin description table in the manufacturer datasheet before assigning loads, since mixing full-rate and half-rate nets on one board is an easy source of timing bugs that only show up as intermittent data errors.
Place the supply decoupling capacitor directly between the VDD and GND pins, with the ground return using a via adjacent to the device rather than a plane path that shares inductance with other branches. PLL-based buffers draw dynamic current proportional to output activity, so a marginal supply can show up as jitter rather than as a brownout. Keep the switching-regulator and its high-current inductor physically away from the clock network to limit supply-coupled noise.
Match each output trace to the actual receiver load and terminate unused clock outputs according to the manufacturer's guidance rather than leaving them floating. Floating outputs can oscillate and inject noise into adjacent nets through supply and substrate coupling. Because PLL outputs behave as low-impedance drivers, a single termination value generally works across all destinations, which simplifies the fan-out design compared with a passive buffer.
合規資訊
No explicit RoHS, REACH or lead-free declarations are published on the pages indexed for this part. The ordering code carries a terminal F, which on IDT/Renesas clock products denotes a lead-free finish, but confirm the declaration against the manufacturer datasheet and product page before releasing the part into an environmentally constrained program. AEC-Q100 does not apply to this commercial clock buffer.
