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Analog Devices Inc. LTC6905HS5-80#TRMPBF
- Part No.:
- LTC6905HS5-80#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC6905HS5-80#TRMPBF.pdf
- Description:
- IC OSC SILICON 80MHZ TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,803
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Product details
Overview
LTC6905HS5-80#TRMPBF from Analog Devices (formerly Linear Technology) is a precision fixed-frequency silicon oscillator in ThinSOT-23 package, delivering factory-trimmed output frequencies of 80MHz, 40MHz, and 20MHz via internal ÷1/÷2/÷4 divider. It operates from 2.7V to 5.5V, features ±0.5% typical frequency accuracy at 25°C, ±20ppm/°C temperature stability, and 0.5ns rise/fall time into 5pF load - used in high-reliability data clocking for aerospace-grade timing and vibration-resistant instrumentation.
For engineers reviewing the LTC6905HS5-80#TRMPBF datasheet, LTC6905HS5-80#TRMPBF pinout, LTC6905HS5-80#TRMPBF application, or LTC6905HS5-80#TRMPBF equivalent, key selection criteria include its H-grade (–40°C to +125°C) operation, rail-to-rail CMOS output driving 600Ω, fast 100µs start-up, OE-controlled synchronous enable/disable, and absence of external tuning components.
Technical Context
The LTC6905HS5-80#TRMPBF integrates a master oscillator with programmable three-state divider (N = 1, 2, or 4), enabling three discrete output frequencies from a single device. Its internal voltage-controlled oscillator uses a precision 1V reference and current-mode biasing to achieve low sensitivity to supply ripple and temperature drift.
Timing control is implemented via dedicated OE (asynchronous disable, synchronous enable) and DIV (three-state logic-selectable divider ratio) pins. Output drive strength is optimized for 5pF capacitive loads and 600Ω resistive loads at 2.7V, with rail-to-rail swing and 50% ±2.5% duty cycle maintained across all operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequencies | 80MHz (÷1), 40MHz (÷2), 20MHz (÷4) - factory-programmed, no external resistor required |
| Frequency Accuracy | ±0.5% typical at 25°C; ±2.9% over –40°C to +125°C - enables tight timing margin in extended-temperature systems |
| Temp Stability | ±20ppm/°C - ensures <±0.24% frequency shift across full H-grade range, critical for thermal cycling environments |
| Rise/Fall Time | 0.5ns (CL = 5pF) - supports clean edge integrity for high-speed clock distribution without added buffering |
| Supply Range | 2.7V to 5.5V - compatible with both 3.3V and 5V logic domains without level-shifting |
| Start-Up Time | 100µs to within 1% of final frequency - meets fast wake-up requirements in power-gated subsystems |
| Duty Cycle | 50% ±2.5% - maintains balanced clock edges for flip-flop setup/hold timing and DDR interface compatibility |
Pinout & Package
Package: TSOT-23-5 (ThinSOT), 1mm profile, JEDEC MO-193 compliant, 5-pin plastic surface-mount package with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Power Supply Input | 2.7V–5.5V rail; requires local 0.1µF bypass to GND for jitter suppression |
| GND (Pin 2) | Ground Reference | Primary return path; must connect directly to ground plane with multiple vias for low-impedance noise rejection |
| OE (Pin 3) | Output Enable Control | Active-high; pulls output high on next rising edge when enabled - eliminates pulse glitches during enable transitions |
| DIV (Pin 4) | Divider Ratio Select | Three-state input: V+ = ÷1, floating = ÷2, GND = ÷4; internal 15µA pull-up/down currents define logic thresholds |
| OUT (Pin 5) | CMOS Clock Output | Rail-to-rail square wave; drives 600Ω min at 2.7V, 5pF max load; 0.5ns edge rate limits trace length to ~2.5cm for signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| No external frequency-setting components | Factory-trimmed oscillator eliminates resistor placement, layout area, and calibration labor - reduces BOM count by one part |
| Synchronous output enable | OE pin triggers output transition only on next clock edge - prevents metastability and spurious pulses in synchronized clock trees |
| Three selectable output frequencies | Single device replaces three crystal oscillators or multiple clock generators - simplifies inventory and design reuse |
| H-grade temperature range | Specified performance from –40°C to +125°C - qualified for under-hood automotive, downhole tools, and industrial control cabinets |
| Low timing jitter | <0.8% typical period jitter - meets setup/hold margins for 100MHz+ digital interfaces without additional jitter cleaning |
Applications
| Aerospace Data Acquisition Systems | Industrial Motor Drive Controllers |
|---|---|
Use Scenario: High-vibration sensor data capture in flight control units where crystal oscillators fail due to mechanical shock. IC Role / Device Role / Timing Role: Primary system clock source for ADC sampling and FPGA logic timing, replacing fragile ceramic resonators. Use Value: ±20ppm/°C stability and 100µs start-up ensure deterministic timing recovery after power cycling in harsh thermal transients. | Use Scenario: Synchronized PWM generation in servo drives requiring precise phase alignment across multiple IGBT gate drivers. IC Role / Device Role / Timing Role: Master clock generator feeding PLLs and digital PWM modules in real-time motion control ASICs. Use Value: 50% ±2.5% duty cycle and 0.5ns edge rate maintain consistent dead-time margins across temperature and supply variations. |
| Downhole Oilfield Instrumentation | Military Radios with Frequency Hopping |
Use Scenario: Pressure/temperature telemetry modules deployed in boreholes exceeding 125°C ambient. IC Role / Device Role / Timing Role: Timing reference for RF upconversion and serial data framing in high-temperature ASICs. Use Value: H-grade qualification and ±2.9% total frequency error guarantee reliable UART and SPI communication at extreme junction temperatures. | Use Scenario: Rapid frequency switching between 20MHz, 40MHz, and 80MHz channels in secure HF/VHF transceivers. IC Role / Device Role / Timing Role: Agile clock source enabling instantaneous channel reconfiguration without external PLL lock delay. Use Value: Three factory-set frequencies accessed via single-pin DIV control eliminate need for multiple oscillators or complex synthesizer ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-frequency oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6905IS5-80#TRMPBF | I-grade (–40°C to +85°C); identical electrical specs except wider temp range spec | Not rated for continuous operation above +85°C; unsuitable for under-hood or downhole use | Select only if system ambient stays ≤85°C and cost sensitivity outweighs long-term reliability risk |
| SiT8008BI-23-XXE-80.000000 | MEMS-based; ±10ppm initial accuracy; 2.5V–3.6V supply only; 150µA typical IS | Lower power but narrower voltage range; lacks OE/DIV pins - fixed single-output only | Choose when ultra-low power and tighter initial accuracy are prioritized over multi-frequency flexibility and wide supply range |
Compared with LTC6905IS5-80#TRMPBF and SiT8008BI-23-XXE-80.000000, the LTC6905HS5-80#TRMPBF uniquely combines extended temperature operation, three user-selectable frequencies, and robust 2.7V–5.5V supply tolerance - making it the only option qualified for mission-critical timing in thermally aggressive embedded systems.
Availability
LTC6905HS5-80#TRMPBF is available at Aetrix Electronics and suitable for aerospace avionics, downhole instrumentation, and industrial motor control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC6905HS5-80#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 full product support, datasheet documentation, and long-term manufacturing commitment for legacy Linear timing products.
The LTC6905 series was designed as a drop-in replacement for quartz crystals and ceramic resonators in space-constrained, high-reliability systems where mechanical fragility, temperature sensitivity, and board-level tuning complexity are unacceptable.
FAQ
What is the maximum operating temperature for the LTC6905HS5-80#TRMPBF?
The LTC6905HS5-80#TRMPBF is rated for continuous operation from –40°C to +125°C, with full electrical specifications guaranteed across this extended temperature range. Its H-grade qualification makes it suitable for under-hood automotive, downhole oilfield tools, and industrial control enclosures where ambient temperatures exceed +85°C. The device's thermal resistance (θJA = 150°C/W) and 125°C junction limit require appropriate PCB copper area for heat dissipation at maximum load.
How does the DIV pin select output frequency on the LTC6905HS5-80#TRMPBF?
The DIV pin on the LTC6905HS5-80#TRMPBF is a three-state input that selects among three factory-programmed frequencies: tying DIV to V+ selects ÷1 (80MHz), leaving DIV floating selects ÷2 (40MHz), and tying DIV to GND selects ÷4 (20MHz). Internal 15µA current sources detect the state; floating DIV must be shielded or bypassed with 1nF to prevent noise coupling. This eliminates external logic or jumpers while maintaining deterministic frequency selection.
Can the LTC6905HS5-80#TRMPBF drive a 50Ω transmission line directly?
The LTC6905HS5-80#TRMPBF cannot drive a 50Ω transmission line directly without signal degradation. Its output is specified for 600Ω minimum resistive load at 2.7V and 5pF capacitive load. Driving 50Ω requires series termination (e.g., 450Ω resistor at source) to match impedance and prevent reflections. Application Note 6905x TA02 shows a validated 950Ω series resistor configuration for 50Ω cable driving - confirming that direct 50Ω connection violates output drive capability and risks excessive current draw.
What is the start-up behavior of the LTC6905HS5-80#TRMPBF when OE is asserted?
When OE is pulled high on the LTC6905HS5-80#TRMPBF, the output enables synchronously on the next rising edge of the internal clock - preventing pulse slivers or runt pulses. Start-up time to within 1% of final frequency is 100µs typical, measured from V+ reaching regulation. If OE is asserted before V+ stabilizes, the device waits until supply is valid before beginning oscillation; no output is generated until both V+ is in spec and OE is high.
Does the LTC6905HS5-80#TRMPBF require an external bypass capacitor?
Yes, the LTC6905HS5-80#TRMPBF requires a minimum 0.1µF ceramic bypass capacitor placed directly between V+ (Pin 1) and GND (Pin 2), with no vias or traces between capacitor pads and pins. This is mandatory to suppress supply noise-induced jitter and ensure ±0.5% frequency accuracy. Layout guidelines specify same-side placement, no inter-layer vias, and multiple ground vias adjacent to Pin 2 - failure to follow causes measurable jitter increase and potential frequency drift beyond datasheet limits.
LTC6905HS5-80#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:
- 80MHz
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 7 mA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- TSOT-23-5
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6905HS5-80#TRMPBF FAQ
1.How can I place an order for LTC6905HS5-80#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6905HS5-80#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 LTC6905HS5-80#TRMPBF reliable?
The price and inventory of LTC6905HS5-80#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6905HS5-80#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC6905HS5-80#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6905HS5-80#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6905HS5-80#TRMPBF?
LTC6905HS5-80#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6905HS5-80#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 LTC6905HS5-80#TRMPBF?
For technical support, including LTC6905HS5-80#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6905HS5-80#TRMPBF requirements.
6.How does Aetrix verify that LTC6905HS5-80#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC6905HS5-80#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 LTC6905HS5-80#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC6905HS5-80#TRMPBF?
All LTC6905HS5-80#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6905HS5-80#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 LTC6905HS5-80#TRMPBF part is unused and in its original packaging.
Return procedure for LTC6905HS5-80#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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