XLH736057.272727I

FAQFrequently Asked Questions

• Can the XLH736057.272727I be used as a direct replacement for legacy parallel-cut crystal oscillators in existing PCB designs without layout modifications? The XLH736057.272727I is an XO (Standard) oscillator, not a parallel-cut crystal, so direct substitution for crystal-based designs requires significant rework. If your design currently uses a discrete crystal with external load capacitors and a logic gate oscillator circuit, migrating to the XLH736057.272727I eliminates the need for those external components and reduces PCB footprint. However, timing characteristics differ: crystals exhibit different phase noise and frequency stability profiles compared to this HCMOS oscillator. Verify that the ±25ppm frequency stability of the XLH736057.272727I meets your system's clock tolerance before committing to replacement. Additionally, the 6-SMD, No Lead package requires compatible assembly equipment; older designs may have been routed for through-hole or larger surface-mount packages.
• What are the practical design implications of the 47mA maximum supply current specification for the XLH736057.272727I in battery-powered or power-constrained applications? At 47mA maximum supply current, the XLH736057.272727I draws substantially more power than passive crystals with external CMOS oscillator circuits (typically 5–15mA for comparable frequencies). In battery-powered systems, this 3–4× current increase directly impacts battery life and thermal output. The oscillator's Enable/Disable function allows gating the output during low-power modes, but the supply current specification assumes the device is actively oscillating. If your application requires extended standby operation, design in a control path to disable the XLH736057.272727I during sleep states. For systems where clock gating is infeasible, evaluate lower-power alternatives or budget the additional 30mA in your power supply and thermal design.
• How does the ±25ppm frequency stability of the XLH736057.272727I affect clock recovery, data serialization, or synchronization circuits that depend on precise frequency alignment? The ±25ppm frequency stability translates to a maximum deviation of ±1.45 kHz at 57.272727 MHz (±0.0025% frequency error). Clock recovery loops and phase-locked loops (PLLs) can typically tolerate this deviation if loop bandwidth is appropriately designed; however, systems requiring sub-ppm accuracy for long-duration synchronization (such as precise data acquisition or network timing) may experience drift over extended operation. If your design uses the XLH736057.272727I as a reference for a PLL with a narrow loop bandwidth, verify that the loop can acquire and maintain lock across the full ±25ppm specification range. For applications sensitive to frequency aging or temperature-induced drift, consider implementing periodic re-synchronization or evaluate oscillators with tighter stability specs (±10ppm or better).
• What board-level design considerations apply when integrating the XLH736057.272727I into a mixed-signal design with analog signal paths or sensitive RF components? HCMOS oscillators generate significant high-frequency harmonics and switching noise. The XLH736057.272727I's 57.272727 MHz fundamental and associated harmonics can couple into analog signal paths, particularly if PCB routing places clock traces near sensitive analog inputs, sensor interfaces, or RF sections. Implement dedicated ground planes beneath the oscillator, route clock outputs on inner layers when possible, and use ground vias to isolate the oscillator from other circuits. The 3.3V supply rail should include local decoupling capacitors (0.1µF ceramic plus bulk capacitance) placed within 5mm of the XLH736057.272727I's power pins to suppress supply noise. If your analog circuits operate at sub-microvolt resolution, additional shielding or differential clock distribution may be necessary.
• Is the XLH736057.272727I suitable as a replacement for legacy Renesas or competitor XO models in legacy designs, and what compatibility factors should be verified? The XLH736057.272727I belongs to the Renesas XPRESSO™ FXO-HC73 series and uses the base product number XLH736. It may be compatible with other XLH736-series variants if frequency and voltage ratings match, but direct substitution requires verification of several factors: pinout compatibility (confirm all six leads match), supply voltage (this model is 3.3V only; legacy designs may expect 5V), output type (HCMOS vs. LVDS or other standards), and package thermal characteristics. If replacing an oscillator from a different manufacturer (e.g., Epson, TXC, or Abracon), cross-check the pinout and output impedance; HCMOS output typically exhibits 50Ω impedance, but older designs may expect different drive capability. Test prototypes thoroughly before full-scale replacement to verify clock edge timing and jitter behavior.
• Under what operating temperature conditions does the ±25ppm frequency stability of the XLH736057.272727I remain valid, and what additional drift should be budgeted outside the -40°C to 85°C range? The ±25ppm specification is guaranteed across the full -40°C to 85°C operating range stated for the XLH736057.272727I. Within this range, frequency drift due to temperature is typically specified as a frequency-temperature coefficient (e.g., ppm/°C), though this is not explicitly listed in the datasheet parameters. To estimate temperature-induced drift, assume worst-case behavior: if the oscillator exhibits significant temperature sensitivity, frequency can shift by several ppm per degree Celsius. For applications outside the -40°C to 85°C range, the oscillator's performance is unspecified; thermal runaway or frequency divergence may occur. If your system operates in extreme environments (above 85°C or below -40°C), either specify a device with extended temperature rating or implement real-time frequency calibration in firmware.
• What are the electrical loading constraints when driving multiple logic inputs or signal chains from the XLH736057.272727I's HCMOS output? HCMOS output stages on oscillators like the XLH736057.272727I typically drive 50Ω coaxial loads or terminated transmission lines with limited fanout before signal integrity degrades. Each standard CMOS input presents roughly 5–10pF input capacitance; driving more than 3–4 unterminated logic inputs directly from the XLH736057.272727I's output may result in excessive rise/fall time distortion or sub-threshold logic levels, causing metastable states or clock jitter. If your design requires driving multiple clock domains, either buffer the XLH736057.272727I output through a dedicated clock driver IC (e.g., Renesas CY2DP514, Maxim MAX7480) or implement terminated clock distribution with point-to-point routing. Additionally, confirm the output impedance and rise/fall times from the datasheet; HCMOS is typically faster than CMOS but slower than LVDS, so EMI and signal integrity trade-offs must be evaluated.
• How does the Moisture Sensitivity Level (MSL) 1 rating of the XLH736057.272727I affect handling, reflow profile, and shelf life in high-humidity manufacturing environments? MSL 1 is the least restrictive moisture sensitivity rating; the XLH736057.272727I can be stored indefinitely at room temperature without baking before reflow. This eliminates a significant process bottleneck in manufacturing: no pre-reflow bake cycle is required, and shelf life is unlimited. However, this does not exempt the device from moisture pickup during assembly line exposure. After the package is opened, store the XLH736057.272727I in dry-bag packaging with desiccant in a controlled humidity environment (less than 60% RH) to minimize corrosion of internal wire bonds and prevent reliability issues. If the part is exposed to humidity above 80% for extended periods before reflow, perform a mild bake (60°C for 4–8 hours) to drive off surface moisture. The MSL 1 rating simplifies just-in-time supply chain management but does not eliminate the need for proper storage discipline.
• What are the Enable/Disable function's timing characteristics, and can the XLH736057.272727I be safely toggled at high frequency for dynamic clock gating in power management schemes? The XLH736057.272727I includes an Enable/Disable function for power management, but the datasheet does not specify enable/disable response time (rise time to stable oscillation or decay time after disable). Typical HCMOS oscillators exhibit 100–500ns enable settling time and may exhibit overshoot or ringing when transitioning between enabled and disabled states. For power-gating applications, avoid toggling the enable line at frequencies comparable to the 57.272727 MHz clock rate; instead, disable the oscillator during entire sleep phases (milliseconds to seconds). If high-frequency clock gating is required (sub-microsecond granularity), implement additional synchronization logic to prevent metastable conditions in downstream flip-flops. Consult the full datasheet or contact Renesas Applications Engineering for precise enable/disable timing to validate your dynamic power management design.
• Is the XLH736057.272727I RoHS3 and REACH compliant for use in regulated automotive, medical, or industrial applications, and what documentation is available for compliance verification? The XLH736057.272727I is RoHS3 Compliant and REACH Unaffected, meeting the EU's Restriction of Hazardous Substances Directive (RoHS3) and Chemical Regulations (REACH). This means the device does not contain lead, cadmium, mercury, hexavalent chromium, PBBs, or PBDEs above specified thresholds. For automotive applications (ISO 26262 functional safety), medical devices (IEC 60601), or other regulated sectors, RoHS3 compliance is a baseline requirement but does not constitute full regulatory approval. You must obtain Renesas's Certificate of Compliance (CoC) and Declaration of Conformity (DoC) for your supply chain documentation. Additionally, verify that the 6-SMD, No Lead package and reflow profile meet the thermal cycling requirements of your target application (AEC-Q200 for automotive, IPC standards for reliability). Contact your Renesas distributor or field applications engineer for compliance paperwork specific to your regulated market.
• How does the 57.272727 MHz frequency of the XLH736057.272727I relate to common communication protocols or standards, and are there impedance matching or termination requirements? The 57.272727 MHz frequency is an unusual non-standard rate, not aligned with common clock frequencies used in USB (48 MHz), Ethernet (125 MHz), or SDI video standards. This frequency is typically chosen for proprietary or legacy systems, custom DSP applications, or specific industrial protocols. If your design uses this frequency, verify that the protocol or chipset specification explicitly requires 57.272727 MHz (or a harmonic thereof); using the wrong clock rate can result in data corruption or synchronization loss. For PCB transmission line design, treat the XLH736057.272727I output as a 57.272727 MHz signal with wavelength approximately 5.2 meters in free space; at typical PCB propagation speeds, traces longer than 50–100mm may require impedance termination (typically 50Ω or 75Ω, depending on receiver specs). Refer to your receiver IC's datasheet for recommended source impedance and termination scheme.
• What are the long-term reliability and aging characteristics of the XLH736057.272727I in continuous-operation industrial scenarios, and are there known failure modes or degradation mechanisms? HCMOS oscillators based on silicon resonators (such as the XLH736 series) exhibit better long-term frequency stability than quartz crystals, typically aging at rates of a few ppm per year rather than tens of ppm per year for aged crystals. However, the XLH736057.272727I's ±25ppm specification does not explicitly separate initial accuracy from aging drift. In continuous industrial operation at elevated temperatures (near the 85°C limit), silicon die and bonding wire can experience stress migration, leading to gradual frequency drift or, in rare cases, oscillation cessation. Thermal cycling (e.g., daily temperature swings in outdoor applications) can accelerate fatigue at solder joints and internal connections. For mission-critical applications, implement periodic frequency calibration (via PLL or DSP-based correction) to compensate for long-term drift, and design thermal management to keep the oscillator well below 85°C. If extended MTBF data is required, contact Renesas for reliability reports (FIT rates, wear-out models) specific to your operating profile.