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Analog Devices Inc. LTC6905CS5#TRMPBF
- Part No.:
- LTC6905CS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC6905CS5#TRMPBF.pdf
- Description:
- IC OSC SILICON PROG TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,803
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Product details
Overview
LTC6905CS5#TRMPBF from Analog Devices (formerly Linear Technology) is a precision programmable silicon oscillator IC used for high-frequency clock generation in space-constrained digital 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 timing jitter at 170MHz - ideal for replacing ceramic or crystal oscillators in FPGA, microcontroller, and data bus timing applications.
For engineers reviewing the LTC6905CS5#TRMPBF datasheet, LTC6905CS5#TRMPBF pinout, LTC6905CS5#TRMPBF application, or LTC6905CS5#TRMPBF equivalent, key selection criteria include resistor-programmable frequency range, three-state divider control (÷1/÷2/÷4), SOT-23-5 package compatibility, temperature stability (±20ppm/°C), and fast 100μs start-up time in embedded timing designs.
Technical Context
The LTC6905CS5#TRMPBF implements a proprietary linearized feedback loop that fixes the relationship between RSET and output frequency, eliminating lookup tables and enabling direct calculation via fOSC = (168.5 MHz × 10 kΩ / RSET) + 1.5 MHz. Its master oscillator operates from 68.9MHz to 170MHz, then passes through an internal programmable divider (N = 1, 2, or 4) to achieve the full 17.225–170MHz output range.
Frequency setting relies on a precision current-voltage ratio: the SET pin is biased ~1V below V+, and RSET (10kΩ–25kΩ) connected between V+ and SET establishes both voltage drop and current flow. The DIV pin uses three-state detection (V+, floating, GND) to select division ratio without external logic, while the CMOS output drives 500Ω loads with 0.5ns rise/fall times (CL = 5pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 17.225MHz to 170MHz - covers high-speed data bus clocks, FPGA reference clocks, and MCU system clocks without external PLLs. |
| Frequency Accuracy | ±0.5% typical (0°C to 70°C) - enables reliable timing without calibration in industrial-grade digital systems. |
| Timing Jitter | 7.2ps RMS at 170MHz - supports low-bit-error-rate serial links and high-resolution sampling clocks. |
| Supply Voltage | 2.7V to 5.5V - interoperable with 3.3V and 5V logic domains; no level-shifting required. |
| Duty Cycle | 50% ±2.5% - ensures balanced high/low periods critical for synchronous logic and DDR interfaces. |
| Start-Up Time | 100μs to within 1% of final frequency - meets fast wake-up requirements in power-managed systems. |
| Temp Stability | ±20ppm/°C - maintains frequency integrity across ambient temperature swings in unregulated enclosures. |
Pinout & Package
Package: 5-lead TSOT-23 (S5), 1mm profile, JEDEC MO-193 compliant - optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Positive supply input | Accepts 2.7V–5.5V; requires local 0.1μF bypass to GND for noise immunity and stable oscillation. |
| GND (Pin 2) | Ground reference | Must connect directly to low-impedance ground plane; shared return path for SET and DIV bias currents. |
| SET (Pin 3) | Frequency-setting resistor node | Biased ~1V below V+; accepts 10kΩ–25kΩ resistor to V+; stray capacitance must be <10pF to avoid jitter increase. |
| DIV (Pin 4) | Three-state divider control | Tie to V+ for ÷1, float for ÷2, tie to GND for ÷4; internal current sources detect state without pull-ups/downs. |
| OUT (Pin 5) | CMOS clock output | Rail-to-rail square wave; drives 5pF/5kΩ loads directly; rise/fall time = 0.5ns (CL = 5pF); supports 500Ω resistive load at 3V. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor frequency programming | Eliminates need for crystals, trimmers, or EEPROM-based configuration - reduces BOM count and layout complexity. |
| Three-state divider (÷1/÷2/÷4) | Enables three distinct frequency bands per RSET, allowing flexible clock scaling without changing hardware. |
| Linearized RSET-to-frequency transfer | Supports accurate frequency prediction using fOSC = (168.5 MHz × 10 kΩ / RSET) + 1.5 MHz - no interpolation or calibration needed. |
| Low-jitter CMOS output | 7.2ps RMS jitter at 170MHz enables use in SerDes, ADC sampling, and high-speed interface timing where phase noise matters. |
| Fast 100μs start-up | Meets real-time wake-from-sleep requirements in portable and battery-powered instrumentation systems. |
Applications
| High-Speed Data Bus Clocking | FPGA Reference Clock Generation |
|---|---|
Use Scenario: Providing synchronous timing for parallel or source-synchronous buses (e.g., PCIe Gen1, memory controllers, video pixel clocks). IC Role / Device Role / Timing Role: Primary clock source driving multiple receivers with matched trace lengths; replaces fixed-frequency crystal oscillators. Use Value: 170MHz max frequency and 50% ±2.5% duty cycle ensure setup/hold margin compliance; low jitter prevents bit errors in multi-Gbps transfers. |
Use Scenario: Supplying clean, stable reference clocks to FPGA transceivers, PLLs, and logic fabric in prototyping and production boards. IC Role / Device Role / Timing Role: System-level timing reference with programmable frequency to match different I/O standards (LVDS, SSTL, HSTL). Use Value: Resistor-programmability allows rapid frequency iteration during design validation; ±0.5% accuracy avoids re-spinning for timing closure issues. |
| Microcontroller System Clock | Ceramic Oscillator Replacement |
Use Scenario: Generating main system clock for ARM Cortex-M, RISC-V, or legacy 8/16-bit MCUs requiring >50MHz operation. IC Role / Device Role / Timing Role: Single-chip clock source replacing discrete crystal + load capacitors + buffer; integrated CMOS driver eliminates external buffer stage. Use Value: 2.7V–5.5V supply range matches MCU core I/O voltages; 100μs start-up supports fast boot sequences and low-power wake-up modes. |
Use Scenario: Upgrading cost-sensitive consumer electronics (set-top boxes, audio DACs, display controllers) from ceramic resonators to higher-accuracy timing. IC Role / Device Role / Timing Role: Drop-in replacement for 20–100MHz ceramic oscillators with improved frequency stability and reduced board area. Use Value: ±20ppm/°C tempco and ±0.5% total error exceed typical ceramic resonator specs (±0.5% initial + ±0.3%/°C), improving system reliability across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6900IS5#TRMPBF | Lower frequency range (1kHz–20MHz), 3.5mA typical supply current at 10MHz, same SOT-23-5 package. | Targeted at low-power, sub-20MHz timing (RTC, UART, sensor interfaces) - not suitable for high-speed data paths. | Select when system clock requirements are <20MHz and ultra-low quiescent current is prioritized over speed. |
| LTC6903CS6#TRMPBF | I²C-programmable (not resistor-set), 1kHz–68MHz range, 6-lead SOT-23 package, ±0.25% accuracy. | Enables dynamic frequency changes in firmware; requires I²C bus and software support - adds complexity vs. static resistor config. | Choose when runtime reconfiguration or tighter accuracy is required, and I²C resources are available. |
Compared with LTC6905CS5#TRMPBF, LTC6900IS5#TRMPBF trades maximum frequency and jitter performance for lower power, while LTC6903CS6#TRMPBF exchanges resistor simplicity for digital programmability and enhanced accuracy - neither offers identical 17–170MHz coverage with single-resistor ease-of-use.
Availability
LTC6905CS5#TRMPBF is available at Aetrix Electronics and suitable for FPGA reference clocking, high-speed data bus synchronization, and microcontroller system timing requiring stable component supply across industrial temperature grades.
Supply support for LTC6905CS5#TRMPBF 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 series was designed as a resistor-programmable, high-frequency alternative to quartz and ceramic oscillators - targeting space-constrained, high-reliability digital systems needing predictable, low-jitter clocks without crystal aging or mechanical sensitivity.
FAQ
What is the minimum and maximum frequency supported by the LTC6905CS5#TRMPBF?
The LTC6905CS5#TRMPBF supports an output frequency range of 17.225MHz to 170MHz. This is achieved using a master oscillator (68.9–170MHz) combined with a programmable divider (÷1, ÷2, or ÷4). Minimum frequency occurs at ÷4 with RSET = 25kΩ; maximum occurs at ÷1 with RSET = 10kΩ. The LTC6905CS5#TRMPBF datasheet confirms these limits under specified supply and temperature conditions.
How does the DIV pin on the LTC6905CS5#TRMPBF determine output frequency division?
The DIV pin (Pin 4) on the LTC6905CS5#TRMPBF uses three-state detection: tied to V+ selects ÷1, floating selects ÷2, and tied to GND selects ÷4. Internal current sources (15μA pull-up, 11μA pull-down) enable robust state recognition without external resistors. This allows the LTC6905CS5#TRMPBF to generate three distinct frequency bands for each RSET value, confirmed in the Pin Functions section of the official datasheet.
What is the recommended RSET resistor tolerance for maintaining ±0.5% frequency accuracy with the LTC6905CS5#TRMPBF?
To maintain the LTC6905CS5#TRMPBF's typical ±0.5% frequency accuracy, a 0.1% metal-film resistor is recommended for RSET. The datasheet explicitly states "resistor, RSET, tolerance will add to the frequency error," and characterization shows that 1% tolerance resistors contribute measurable error beyond the base ±0.5%. Using a 0.1% resistor ensures the LTC6905CS5#TRMPBF achieves its specified accuracy over temperature and supply voltage.
Can the LTC6905CS5#TRMPBF operate from a 2.5V supply?
No - the LTC6905CS5#TRMPBF has a specified minimum supply voltage of 2.7V. Absolute Maximum Ratings list V+ to GND as –0.3V to 6V, but Electrical Characteristics are guaranteed only from 2.7V to 5.5V. Operation below 2.7V risks failure to start, frequency drift, or undefined behavior; the LTC6905CS5#TRMPBF is not characterized or warranted for 2.5V use.
What layout practices minimize jitter on the LTC6905CS5#TRMPBF SET pin?
To minimize jitter on the LTC6905CS5#TRMPBF SET pin (Pin 3), limit stray capacitance to ≤10pF by keeping the RSET trace short and away from noisy signals, using a ground shield around the node, and avoiding vias near the pin. The datasheet specifies this as critical: excess capacitance degrades phase noise and may cause instability. These practices directly impact the LTC6905CS5#TRMPBF's 7.2ps RMS jitter spec at 170MHz.
LTC6905CS5#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC6905CS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6905CS5#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC6905CS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6905CS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC6905CS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6905CS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6905CS5#TRMPBF?
LTC6905CS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6905CS5#TRMPBF 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#TRMPBF?
For technical support, including LTC6905CS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6905CS5#TRMPBF requirements.
6.How does Aetrix verify that LTC6905CS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC6905CS5#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC6905CS5#TRMPBF?
All LTC6905CS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6905CS5#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC6905CS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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