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Analog Devices Inc. LTC6905CS5#TRPBF
- Part No.:
- LTC6905CS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC6905CS5#TRPBF.pdf
- Description:
- IC OSC SILICON PROG TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,905
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Product details
Overview
LTC6905CS5#TRPBF from Analog Devices (formerly Linear Technology) is a precision resistor-programmable silicon oscillator IC designed for high-frequency clock generation in space-constrained systems. It delivers rail-to-rail CMOS square-wave output from 17.225MHz to 170MHz with ±0.5% typical frequency accuracy over 0°C to 70°C, 2.7V–5.5V supply operation, and 7.2ps RMS jitter at 170MHz - ideal for high-speed data bus timing and crystal oscillator replacement.
For engineers reviewing the LTC6905CS5#TRPBF datasheet, LTC6905CS5#TRPBF pinout, LTC6905CS5#TRPBF application, or LTC6905CS5#TRPBF equivalent, key selection criteria include its single-resistor frequency programming (10k–25kΩ), three-state DIV input for ÷1/÷2/÷4 division, 100μs typical start-up time, ±20ppm/°C tempco, and SOT-23-5 package compatibility with high-density PCB layouts.
Technical Context
The LTC6905CS5#TRPBF implements a proprietary linearized feedback loop that fixes the relationship between RSET and master oscillator frequency (fMO = 168.5MHz × (10kΩ/RSET) + 1.5MHz), eliminating lookup tables. Its internal three-state DIV input detects V+, floating, or GND states to select ÷1, ÷2, or ÷4 division of fMO, enabling overlapping output ranges (e.g., 34.45–85MHz achievable via ÷2 or ÷4).
It features a PMOS-based SET pin bias that holds VSET ≈ V+ − 1V, ensuring stable current sourcing through RSET. The CMOS output driver provides 0.5ns rise/fall times (CL = 5pF), 6mA typical supply current at 100MHz, and rail-to-rail switching - all within a 1mm-profile ThinSOT™ package optimized for noise-sensitive clocking applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 17.225MHz to 170MHz output; selectable via RSET (10k–25kΩ) and DIV pin state (÷1/÷2/÷4) |
| Frequency Accuracy | ±0.5% typical over 0°C to 70°C; includes RSET tolerance contribution |
| Tempco | ±20ppm/°C over full operating range; enables stable timing in industrial ambient shifts |
| Jitter | 7.2ps RMS at 170MHz; supports low-bit-error-rate serial links and high-speed sampling clocks |
| Supply Range | 2.7V to 5.5V single supply; operates reliably across Li-ion, 3.3V, and 5V system rails |
| Start-up Time | 100μs typical to 1% frequency settling; suitable for power-gated or wake-on-clock systems |
| Duty Cycle | 47.5% to 52.5%; meets 50% ±2.5% requirement for balanced clock distribution networks |
Pinout & Package
Package: 5-lead Plastic TSOT-23 (S5), 1mm profile, JEDEC MO-193 compliant, footprint compatible with standard SOT-23-5 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Positive Supply Input | 2.7V–5.5V rail; requires local 0.1μF bypass to GND for low-noise operation |
| GND (Pin 2) | Ground Reference | Must connect directly to low-impedance ground plane; critical for jitter and accuracy |
| SET (Pin 3) | Frequency-Setting Resistor Node | Accepts 10k–25kΩ resistor to V+; voltage held at ~V+−1V; stray capacitance ≤10pF required |
| DIV (Pin 4) | Programmable Divider Control | Three-state logic: V+ = ÷1, floating = ÷2, GND = ÷4; internal current sources detect state |
| OUT (Pin 5) | CMOS Clock Output | Rail-to-rail square wave; drives 500Ω load at 3V; 0.5ns rise/fall (CL = 5pF) |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor frequency programming | Eliminates need for crystals, trimmers, or EEPROM; reduces BOM count and layout complexity |
| Linear RSET-to-frequency transfer | Enables direct calculation using fOSC = (168.5MHz × 10kΩ / RSET) + 1.5MHz × N−1; no calibration tables required |
| Three-state DIV input | Provides three discrete output frequencies per RSET value, enabling flexible clock tree design without re-routing |
| Low-jitter CMOS output | 7.2ps RMS jitter at 170MHz ensures timing margin for DDR, USB, and PCIe reference clocks |
| Fast 100μs start-up | Supports dynamic clock enable/disable in battery-powered or low-power MCU systems |
Applications
| High-Speed Data Bus Clocking | FPGA/ASIC Reference Clock |
|---|---|
|
Use Scenario: Generating synchronous clock for DDR3/DDR4 memory interfaces or PCI Express root complexes. IC Role / Device Role / Timing Role: Primary system clock source providing low-jitter, rail-to-rail square wave to memory controller or SerDes PHY. Use Value: 7.2ps RMS jitter at 170MHz meets PCIe Gen3 and DDR4 tJIT(cc) requirements; ÷1/÷2/÷4 flexibility matches multiple interface rates. |
Use Scenario: Supplying clean, programmable clock to FPGA configuration logic or ASIC PLL reference inputs. IC Role / Device Role / Timing Role: Low-phase-noise oscillator replacing quartz crystals where board space or shock resistance is critical. Use Value: ±0.5% accuracy over 0°C–70°C eliminates need for external trimming; SOT-23-5 footprint saves >70% area vs. 4-pin crystal. |
| Crystal Oscillator Replacement | Industrial Sensor Interface Timing |
|
Use Scenario: Replacing 25MHz–100MHz ceramic or quartz oscillators in medical imaging or test equipment. IC Role / Device Role / Timing Role: Drop-in alternative offering superior shock/vibration immunity and faster start-up than mechanical resonators. Use Value: 100μs start-up vs. 1–10ms for crystals enables rapid system boot; ±20ppm/°C tempco outperforms most ceramic oscillators. |
Use Scenario: Providing precise sampling clock for sigma-delta ADCs or time-of-flight sensors in factory automation. IC Role / Device Role / Timing Role: Stable, low-drift clock source synchronizing analog front-end acquisition and digital processing blocks. Use Value: ±20ppm/°C drift ensures <100ppm total error over –20°C to +70°C ambient; 50% ±2.5% duty cycle maintains ADC aperture timing integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6905IS5#TRPBF | Same architecture and pinout; extended temperature range (–40°C to 85°C) vs. LTC6905CS5#TRPBF's 0°C to 70°C | Suitable for automotive cabin modules or outdoor industrial controllers requiring wider thermal margin | Select when operating ambient exceeds 70°C or requires AEC-Q200-aligned qualification testing |
| LTC6905-100 | Fixed-frequency variant (100MHz); internal RSET eliminates external resistor; ±0.1% accuracy vs. ±0.5% typical for LTC6905CS5#TRPBF | Used where frequency stability trumps programmability - e.g., Ethernet PHY reference clocks | Choose when exact 100MHz is required and board space for RSET must be minimized |
Compared with LTC6905CS5#TRPBF, the LTC6905IS5#TRPBF offers broader thermal operation without sacrificing performance, while the LTC6905-100 trades programmability for higher accuracy and zero external components - making each optimal for distinct design constraints: temperature robustness versus fixed-frequency precision.
Availability
LTC6905CS5#TRPBF is available at Aetrix Electronics and suitable for high-speed data bus clocking, FPGA reference timing, and crystal oscillator replacement applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for LTC6905CS5#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog and timing product lines. Linear pioneered high-performance silicon oscillators with patented linearization techniques.
The LTC6905 family was designed specifically for applications needing crystal-grade accuracy without quartz components - targeting space-constrained, high-reliability systems in communications, instrumentation, and industrial control where shock, vibration, or fast start-up preclude traditional resonators.
FAQ
What is the minimum and maximum frequency supported by the LTC6905CS5#TRPBF?
The LTC6905CS5#TRPBF supports an output frequency range of 17.225MHz to 170MHz. This is achieved by combining a master oscillator (68.9MHz–170MHz) with a programmable ÷1/÷2/÷4 divider. Minimum frequency occurs with RSET = 25kΩ and DIV = GND (÷4); maximum occurs with RSET = 10kΩ and DIV = V+ (÷1). All values are specified over 0°C to 70°C.
How does the DIV pin on the LTC6905CS5#TRPBF determine the output frequency division ratio?
The DIV pin (Pin 4) on the LTC6905CS5#TRPBF uses three-state detection: tying it to V+ selects ÷1, leaving it floating selects ÷2, and connecting it to GND selects ÷4. Internal current sources (15μA pull-up, 11μA pull-down) enable reliable floating-state detection. This allows one RSET value to yield three distinct output frequencies - for example, RSET = 15kΩ gives ~112MHz (÷1), ~56MHz (÷2), or ~28MHz (÷4).
What is the recommended layout practice for the SET pin (Pin 3) of the LTC6905CS5#TRPBF to ensure low jitter?
To minimize jitter on the LTC6905CS5#TRPBF, stray capacitance on the SET pin must be limited to ≤10pF. Place the RSET resistor as close as possible to Pin 3 and V+, share its V+ connection with the 0.1μF supply bypass capacitor, and avoid routing noisy signals nearby. If routing on opposite board layers, position RSET directly under the bypass cap - never use vias in the SET node path.
Can the LTC6905CS5#TRPBF operate from a 2.7V supply while maintaining full frequency range and accuracy?
Yes, the LTC6905CS5#TRPBF is fully specified from 2.7V to 5.5V. At 2.7V, it maintains the full 17.225MHz–170MHz output range and ±0.5% typical frequency accuracy over 0°C to 70°C. However, supply voltage drift contributes up to 0.5%/V to frequency error, so low-noise regulation and bypassing are essential - especially near the lower end of the supply range.
What is the typical supply current of the LTC6905CS5#TRPBF at 100MHz output and 3V supply?
At 100MHz output frequency and 3V supply, the LTC6905CS5#TRPBF draws 6mA typical supply current. This value scales with frequency and supply voltage: it increases to ~14mA at 170MHz/5.5V and drops to ~3mA at 21.44MHz/2.7V (with ÷4 division). Current is measured with RSET = 10kΩ, N = 1, and no load on OUT.
LTC6905CS5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Oscillator, Silicon
- Count:
- -
- Frequency:
- 17MHz ~ 170MHz
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 14 mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- TSOT-23-5
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6905CS5#TRPBF FAQ
1.How can I place an order for LTC6905CS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6905CS5#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC6905CS5#TRPBF reliable?
The price and inventory of LTC6905CS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6905CS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6905CS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6905CS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6905CS5#TRPBF?
LTC6905CS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6905CS5#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC6905CS5#TRPBF?
For technical support, including LTC6905CS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6905CS5#TRPBF requirements.
6.How does Aetrix verify that LTC6905CS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6905CS5#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC6905CS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6905CS5#TRPBF?
All LTC6905CS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6905CS5#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC6905CS5#TRPBF part is unused and in its original packaging.
Return procedure for LTC6905CS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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