ICS542MT - 1:2 Clock Buffer, 156 MHz, 8-SOIC | Renesas
MPN： ICS542MT ✓ 啟用中ICS542MT 概覽
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.
直接替換替代品，適用於 ICS542MT — 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： ICS542MT （相同外形與佔位） — 差異在於 Output Logic.
ICS542M
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ICS542ML
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ICS542MI
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ICS542MPI
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ICS542MT-TR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ICS542MT 規格
| Device Type | Clock fanout buffer and divider IC |
| Divide Ratio | 1:2 |
| Maximum Frequency | 156 MHz |
| Input Logic | CMOS |
| Output Logic | Three-State CMOS |
| Supply Voltage Range | 3 V to 5.5 V |
| Clock Generation Method | Proprietary phase-locked-loop (PLL) technique |
| Number of Circuits | 1 |
| Package Type | 8-SOIC (0.154 inch, 3.90 mm width) |
| 安裝類型 | Surface Mount |
ICS542MT 8-soic (0.154 inch, 3.90 mm width) 腳位配置指南
ICS542MT（8-soic (0.154 inch, 3.90 mm width) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： ICS542MT.
請參閱 資料表 以查看完整腳位配置。
典型應用
ICS542MT 適用於 6 應用s: Communications Clock Distribution, Frequency Conversion After a PLL, Network Interface Timing, Processor and FPGA Clock Trees, Industrial Control and Data Acquisition, Audio and Interface Clock Support.
Communications Clock Distribution
The ICS542MT fits communications systems that receive a high-frequency CMOS reference and need a divided clock for a downstream transceiver, serializer, or digital control block. Its verified maximum input frequency of 156 MHz and 1:2 divide ratio allow a 124 MHz reference to produce a 62 MHz divided clock, for example. The device is placed in the clock path ahead of the receiving logic, with short traces and a stable ground reference. PLL-based clock generation supports deterministic ratio control, but the design must still be checked for jitter, duty-cycle distortion, and output-load margin against the system clock specification.
推薦
Frequency Conversion After a PLL
When a PLL already generates a high-quality reference clock, the ICS542MT can provide a local 1:2 division stage without adding another high-frequency oscillator. The verified 156 MHz input ceiling and 3 V to 5.5 V operating range suit CMOS-based timing chains, including 3.3 V systems. Place the divider close to the loads that require the lower-rate clock and keep the input route away from noisy switching nodes. The primary design trade-off is added propagation delay and jitter compared with deriving both frequencies directly from the PLL.
推薦
Network Interface Timing
Ethernet or other network-interface designs can use the ICS542MT to divide a common system clock into a rate suited for a lower-speed interface or internal control logic. Its CMOS input and three-state CMOS outputs make it practical for digital clock trees, while the 1:2 ratio reduces design complexity compared with a configurable divider. Place the device near the interface clock input and provide local bypass capacitance to prevent supply noise from disturbing the timing edge. Because the verified data does not specify RMS jitter, output skew, or rise-time limits, those parameters must be confirmed from the Renesas datasheet before sign-off.
推薦
Processor and FPGA Clock Trees
The ICS542MT can divide a high-speed board clock into a lower-rate clock for processor peripherals, FPGA logic, or auxiliary controllers. The verified 156 MHz input limit and 1:2 divide function suit systems where a half-rate clock is required but a separate oscillator would add cost and component count. Route the divided clock as a short point-to-point connection and provide a dedicated ground return to reduce susceptibility to edge displacement. The three-state output can be useful when the receiving domain is disabled, although cross-domain sequencing must remain under the control of the system supervisor.
推薦
Industrial Control and Data Acquisition
Industrial controllers and data-acquisition equipment often need a stable, locally divided clock for sampling, conversion, or fieldbus control blocks. The ICS542MT provides a defined divide-by-two relationship from a common CMOS reference, avoiding an additional oscillator and its associated BOM cost. Its 3 V to 5.5 V supply range allows operation across common industrial logic rails. Place bypass capacitors close to the device and keep sensitive analog and high-current switching nodes away from the clock input. Detailed industrial qualification information, including AEC-Q100 status, was not present in the supplied verified data.
推薦
Audio and Interface Clock Support
The ICS542MT may be used as a clock-conditioning or division element in audio and general interface subsystems that need a half-rate derived clock. Although it does not provide the low-noise analog supply regulation expected in a dedicated audio LDO, its CMOS clock function can support converters, digital audio processors, and interface controllers. Keep the divider away from switching power inductors and high-slew-rate digital outputs, since clock-edge displacement is more sensitive to supply and return-path noise than a slow control signal. Confirm output timing and load capacitance against the specific interface timing budget.
推薦
推薦產品摘要
工程參考資料，適用於 ICS542MT — 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 | ICS542M | ICS542ML | ICS542MI | ICS542MPI | ICS542MT-TR |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Divide Ratio | 1:2 | 1:2 family function | 1:2 family function | 1:2 family function | 1:2 family function | 1:2 |
| Input Logic | CMOS | CMOS family function | CMOS family function | CMOS family function | CMOS family function | CMOS |
| Output Logic | Three-State CMOS | Three-State CMOS family function | Three-State CMOS family function | Three-State CMOS family function | Three-State CMOS family function | Three-State CMOS |
| Clock Generation Method | Proprietary PLL technique | ICS542 family PLL technique | ICS542 family PLL technique | ICS542 family PLL technique | ICS542 family PLL technique | Proprietary PLL technique |
主要差異化特點
- Combines clock division and fanout in one one-circuit device (對比ICS542M)
- Supports both 3 V and 5 V CMOS system rails (對比ICS542ML)
- Provides three-state CMOS outputs for controlled bus use (對比ICS542MPI)
設計說明
Place the ICS542MT close to the clock source and the intended receiver. Keep the clock input trace short and continuous, avoid routing it beneath noisy switching nodes, and provide a nearby ground return. Because the device uses proprietary PLL techniques, its reference current and output edges can be sensitive to parasitic inductance and ground bounce. Follow the exact capacitor and layout recommendations in the current Renesas datasheet rather than relying on generic high-speed routing rules.
Decouple the 3 V to 5.5 V supply as close as possible to the device pins, using the capacitance and ESR recommendations from the Renesas ICS542 datasheet. Place the capacitor on the same supply plane and connect it to a low-impedance ground via a short path. Avoid sharing a narrow neck in the supply trace with high-current digital or switching loads, because supply droop can translate into timing jitter or an unstable divided-clock edge.
Treat the ICS542MT output as a digital clock signal with a defined edge rate, not as a generic logic-level output. Match the source and destination load assumptions to the verified timing characteristics, and terminate the trace appropriately when the receiver or cable introduces additional loading. Verify input pulse width, duty cycle, output jitter, and rise/fall time from the full datasheet before relying on the 156 MHz maximum input frequency in a production design.
Do not substitute a clock fanout buffer with the same package without confirming that it provides the required divide ratio and the same pin mapping. Similarly, a divider with a higher maximum frequency is not automatically compatible if its supply range, output logic, enable polarity, or propagation delay differs. For every proposed alternative, compare the pinout, 1:2 divide behavior, CMOS levels, three-state control, timing limits, and lifecycle status against the ICS542MT datasheet.
合規資訊
The supplied verified web data confirms device specifications and sourcing links but does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the manufacturer name or package.