FCO-6K 32.768 kHz RTC XO, 2.0×1.6 mm
SMD 2.0×1.6mm, Ultra Low Power 32.768kHz
FEATURE
Product Description
FCO-6K — 32.768 kHz SMD Crystal Oscillator (2.0×1.6 mm)
Ultra-low current CMOS output oscillator with tri-state enable. Ideal for real-time clocks, wearables, mobile, and health monitoring devices.
32.768 kHz
2.0×1.6 mm SMD
35 µA @ no load
−40~+85/105/125°C
Test conditions (typical): 25 ± 5 °C, no-load current unless otherwise noted. Please confirm final limits in the latest datasheet before design freeze.
Overview
FCO-6K is a miniature 32.768 kHz crystal-controlled oscillator (XO) in a 2.0×1.6 mm SMD package designed for ultra-low power RTC domains and portable electronics. Compared with discrete timing crystals for RTC, the integrated XO simplifies design while ensuring stable timekeeping. For broader context on the ecosystem of timing devices used in electronics, see our engineering guide.
Key Features
- Ultra-low current (typ. 35 µA); standby ≤ 3 µA
- CMOS output, 15 pF load, duty cycle 45–55%
- Tri-state enable via Pin 1 (VIH ≥ 0.7×Vdd, VIL ≤ 0.3×Vdd)
- Start-up time ≤ 20 ms; ±10 ppm @ 25°C（see parameters & stability guide）
- Stability grades: ±25/±30/±50 ppm vs temperature — see frequency-crystal behavior over temperature
- Supply options: 1.8 V / 2.5 V / 3.3 V (1.5 V on request)
- RoHS & REACH compliant; Pb-free
Typical Applications
- Real-Time Clock domains in MCUs and PMICs (see oscillator basics in electronics)
- Wearables & health/wellness trackers
- Mobile phones & ultra-small notebooks
- Action & sports video cameras
- Low-power IoT edge devices
Design-In Notes
- Place a 0.1 µF bypass capacitor as close as possible between Vdd and GND pads.
- Keep the output trace short; terminate near the receiving pin to minimize coupling.
- Observe load capacitance (15 pF) and input thresholds for clean logic transitions.
- Reference: how crystal oscillators work (engineer’s refresher).
Design Tips
Power & Layout
- Decouple Vdd with 0.1 µF within <2 mm; add 1 µF bulk near the rail source.
- Provide a solid ground; avoid split planes under the XO and OUT trace.
- Route OUT away from high dV/dt nets; consider 22–47 Ω series damping at OUT.
- For long routes/multiple loads, buffer OUT; keep total C close to 15 pF.
Logic & Timing
- Use tri-state (Pin 1) for deep-sleep; follow 0.7×Vdd / 0.3×Vdd thresholds.
- Budget start-up time (≤20 ms) before RTC timekeeping is used.
- Verify MCU RTC VIH/VIL at your Vdd option (1.8/2.5/3.3 V).
- Need trade-offs? See selecting timing crystals for RTC accuracy.
EMC / Reliability
- Place ESD at connectors, not directly on XO OUT; avoid extra capacitive load.
- Avoid high-DA conformal coatings above XO; keep board clean to minimize drift.
- Considering alternatives? Read crystal-controlled vs MEMS oscillators.
- Validate frequency across voltage, load, temperature; log drift during burn-in.
Electrical Specifications
Unless otherwise noted, conditions are at 25 ± 5 °C and 40–70% RH; no-load for current values.
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Notes |
|---|---|---|---|---|---|---|
| Nominal Frequency | F | 32.768 | kHz | |||
| Frequency Tolerance @ 25 ± 3 °C | FT | — | ±10 | — | ppm | |
| Supply Voltage | Vdd | 1.8 / 2.5 / 3.3 | V | 1.5 V on request | ||
| Current Consumption (no load) | Icc | — | 35 | — | µA | |
| Standby Current | Icc(ST) | — | — | 3 | µA | |
| Output Load (CMOS) | CL | 15 | pF | |||
| Output High | VoH | 0.9×Vdd | — | — | V | |
| Output Low | VoL | — | — | 0.1×Vdd | V | |
| Rise / Fall Time (10–90%) | Tr / Tf | — | — | 15 | ns | |
| Duty Cycle | TH/T | 45 | — | 55 | % | |
| Tri-State Enable (Pin 1, VIH) | VIH | 0.7×Vdd | — | — | V | Enable |
| Tri-State Disable (Pin 1, VIL) | VIL | — | — | 0.3×Vdd | V | Disable |
| Start-up Time | Tosc | — | — | 20 | ms | |
| Aging (1st year @ 25 °C) | — | — | ±3 | — | ppm/yr | |
Frequency Stability vs Temperature Range
| Stability Grade | −40~+85 °C | −40~+105 °C | −40~+125 °C |
|---|---|---|---|
| ±25 ppm | Available (○) | Conditional (△) | Not available (×) |
| ±30 ppm | Available (○) | Available (○) | Conditional (△) |
| ±50 ppm | Available (○) | Available (○) | Available (○) |
○ Available△ Conditional× Not available
For deeper reading, see why timing crystals matter.
Recommended Applications
| Use Case | Typical Vdd | Temp Range | Stability (ppm) | Guidance |
|---|---|---|---|---|
| Wearables / health-tracker timing design | 1.8 V | −40~+85 °C | ±30 | Optimize for low power; enable tri-state during deep sleep to save µA. |
| Mobile phone RTC / PMIC RTC | 1.8 V | −40~+85 °C | ±25 ~ ±30 | Select tighter ppm if OS timekeeping accuracy matters across daily temp swings. |
| Battery IoT sensors & beacon timing (WLAN/WiMAX) | 1.8 / 2.5 V | −40~+105 °C | ±30 ~ ±50 | Balance ppm with extended temp; confirm availability per stability matrix. |
| Industrial data loggers & automation | 3.3 V | −40~+105 °C | ±30 | Use robust decoupling and short OUT routing for noisy environments. |
| Action / sports cameras (oscillator electronics) | 3.3 V | −40~+85 °C | ±30 | Consider series damping (22–33 Ω) near OUT to reduce ringing on long traces. |
| Harsh environment & 5G telecom timing | 2.5 / 3.3 V | −40~+125 °C | ±50 | Check availability for +125 °C; review start-up and drift at extremes. |
Selections are typical; final choice depends on system budget and availability shown in the matrix above.
Ordering Code / Options
Selection Path
- Step 1: Choose Vdd option: 1.8 V / 2.5 V / 3.3 V (1.5 V on request)
- Step 2: Choose temperature range: −40~+85°C / −40~+105°C / −40~+125°C
- Step 3: Choose stability grade: ±25 / ±30 / ±50 ppm (per availability matrix)
- Step 4: Confirm load and routing: 15 pF CMOS load, short OUT trace, proper decoupling
Helpful references: start-up time considerations, load & drive level basics, aging and drift.
Upgrade Options
- Need a broader family view? See XO overview and XO family selection for industrial/automotive.
- Prefer a discrete RTC crystal approach? Compare with timing crystals for RTC.
- System-level guidance: clock oscillator applications, networking/storage timing, test & measurement timing.
Customization & Supply
- Samples supported for evaluation; volume production available for mass-market programs.
- Customization may include voltage option, stability/temperature grade, and packaging documentation.
- To avoid “no price listed” delays, include target quantity, delivery schedule, and required documents in your RFQ.
Pinout & Mechanical
Pin Assignment (typical 2.0×1.6 mm XO)
- Pin 1: Enable/Disable (Tri-state control)
- Pin 2: GND
- Pin 3: OUT (CMOS)
- Pin 4: Vdd
Confirm exact pad layout with the latest datasheet before tape-out. For GNSS timing considerations see the TCXO for GNSS modules guide.
Dimensions & Land Pattern
Package: 2.0 × 1.6 mm SMD. Refer to the mechanical drawing and recommended PCB land pattern in the datasheet.
Downloads & Resources
- Download Datasheet (PDF)
- Explore all timing devices
- Crystal oscillators — XO product overview
- Timing crystals for RTC & low-power domains
- What is a clock oscillator?
- How does a quartz oscillator work?
- Pierce oscillator design notes
Exploring tighter stability over temperature? See our TCXO vs OCXO comparison.
FAQ
What is the typical current consumption of FCO-6K?
Typical current is 35 µA at no load. A low-power standby mode is available with ≤3 µA.
Which supply voltages are supported?
Standard options include 1.8 V, 2.5 V, and 3.3 V. A 1.5 V option may be available on request; contact FCom for availability.
How do I enable/disable the output?
Pin 1 is the tri-state control. VIH ≥ 0.7×Vdd enables the output; VIL ≤ 0.3×Vdd disables it.
What are the frequency stability options across temperature?
±25/±30/±50 ppm grades are offered with availability depending on the temperature range (−40~+85°C, −40~+105°C, −40~+125°C). See the stability matrix on this page.
Do you offer samples, volume production, or customization?
Yes. FCom supports samples, volume production, and customization (voltage option, temperature/stability grade, packaging). Contact us with your requirements for an RFQ.
What are typical MOQ and lead time?
MOQ and lead time depend on voltage option and stability/temperature grade. Submit an RFQ and we will confirm current MOQ, lead time, and shipment schedule.
Can you provide packaging and test reports?
Packaging options (tape & reel) and supporting documents (inspection or test reports where applicable) can be provided upon request. Please include your documentation needs in the RFQ.
Get Pricing & Samples
Tell us your target Vdd, temperature range, and stability grade (±25/±30/±50 ppm). Our team will confirm availability and lead time.
Certifications: ISO9001 | ISO14001. Need application engineering support? Describe your RTC domain, supply rail, and temperature profile in the RFQ.
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©Fuji Crystal (Hong Kong) Electronics Co., Ltd. All Rights Reserved.
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