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Analog Devices Inc. LTC6991HS6#WTRPBF
- Part No.:
- LTC6991HS6#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC6991HS6#WTRPBF.pdf
- Description:
- TIMERBLOX: RESETTABLE, L FREQ OS
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
LTC6991HS6#WTRPBF from Analog Devices is a silicon-based low-frequency oscillator IC designed for long-duration timing events, featuring programmable clock periods from 1.024 ms to 9.54 hours (29.1 µHz to 977 Hz), ±1.5% max frequency accuracy, and operation across –40°C to 125°C. It uses a single RSET resistor and DIV pin voltage to configure NDIV divider settings (1–221) and polarity mode, with CMOS output capable of sourcing/sinking 20 mA - deployed in automotive watchdog timers and battery-powered intervalometers.
For engineers reviewing the LTC6991HS6#WTRPBF datasheet, LTC6991HS6#WTRPBF pinout, LTC6991HS6#WTRPBF application, or LTC6991HS6#WTRPBF equivalent, key selection criteria include its AEC-Q100 qualification, reset-triggered duty-cycle truncation, 55–80 µA supply current over 2.25–5.5 V supply, and SOT-23 package compatibility with high-vibration environments.
Technical Context
The LTC6991HS6#WTRPBF integrates a master oscillator (1 MHz max) whose frequency is set by ISET current sourced from the SET pin, regulated to 1.00 V ±30 mV. This current determines fMASTER = 1 MHz × 50 kΩ / RSET, then passes through a fixed ÷1024 divider followed by an 8-step programmable divider (NDIV = 1, 8, 64, ..., 221) selected via a 4-bit A/D converter on the DIV pin.
Its reset function operates independently of oscillation - the internal master clock continues running during RST assertion - enabling precise pulse truncation without halting timing core. Polarity (POL bit) configures active-high/low behavior for both RST and OUT pins, with glitch-free DIVCODE transitions completing in <500×tMASTER and no output pulse shorter than tMASTER = 1 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Period Range | 1.024 ms to 34,360 s (9.54 hr); enables multi-hour wake-up intervals without external counters |
| Frequency Accuracy | ±1.5% max over temp/supply; ensures reliable timing in automotive-grade thermal cycling |
| Supply Voltage | 2.25 V to 5.5 V; supports direct connection to Li-ion, 3.3 V, and 5 V rails without regulation |
| Supply Current | 55 µA to 80 µA typical; allows >10-year battery life in 10-second-interval portable sensors |
| Operating Temp | –40°C to +125°C; qualified per AEC-Q100 Grade H for under-hood automotive use |
| Output Drive | ±20 mA CMOS; directly drives logic inputs, LEDs, or MOSFET gates without buffer stages |
| Start-Up Time | 500×tMASTER (≤8 ms); guarantees deterministic initialization after power-on reset |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 1 mm profile, RoHS-compliant, lead-free finish. Exposed pad not present in S6 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Reset control input | Active state determined by POL bit; asserts immediate output latch reset without stopping internal oscillator |
| GND (Pin 2) | Analog/digital ground reference | Low-inductance return path required; bypass V+ to this pin with 0.1 µF capacitor |
| SET (Pin 3) | Frequency-setting current input | Sinks 1.25–20 µA; connects to GND via precision RSET resistor to program master oscillator |
| DIV (Pin 4) | Divider/polarity configuration input | V+ referenced 4-bit A/D input; resistor divider sets NDIV and POL bit simultaneously |
| V+ (Pin 5) | Power supply input | 2.25–5.5 V; must be low-noise; internal POR circuit initiates start-up sequence |
| OUT (Pin 6) | CMOS clock output | Swings rail-to-rail (GND to V+); 30 Ω output impedance; supports 20 mA sink/source |
Key Features
| Feature | Design Value |
|---|---|
| Resettable pulse generation | Truncates output period on demand while preserving internal timing continuity - critical for synchronized system wake-up |
| Polarity-selectable I/O | POL bit configures RST/OUT as active-high or active-low in same hardware layout - eliminates board revisions for signal inversion |
| Single-resistor frequency programming | RSET resistor (50–800 kΩ) sets base frequency with no calibration needed - reduces BOM count and assembly cost |
| AEC-Q100 automotive qualification | H-grade (–40°C to +125°C) qualification confirmed for automotive applications - enables drop-in use in ADAS and body control modules |
| Ultra-low supply current | As low as 55 µA at 2.25 V/800 kΩ - extends coin-cell lifetime beyond 10 years in 1-minute wake-up applications |
Applications
| Automotive Watchdog Timer | Industrial Intervalometer |
|---|---|
Use Scenario: Monitors microcontroller health in engine control units, triggering safe-state recovery if firmware hangs. IC Role / Device Role / Timing Role: Generates precise 2-second timeout pulses; RST pin resets MCU upon expiration. Use Value: AEC-Q100 H-grade operation ensures reliability at 125°C under-hood; ±1.5% accuracy prevents false triggers across temperature. | Use Scenario: Controls periodic sampling of pressure sensors in oil-field monitoring equipment deployed in remote desert locations. IC Role / Device Role / Timing Role: Provides 15-minute wake-up intervals to activate sensor readout and radio transmission. Use Value: 55 µA quiescent current enables 10+ year operation on primary lithium thionyl chloride cells; SOT-23 footprint minimizes PCB area. |
| Battery-Powered "Heartbeat" Signal | High-Vibration Equipment Monitor |
Use Scenario: Generates visible LED blink pattern (once per minute) on portable medical diagnostic devices to confirm operational status. IC Role / Device Role / Timing Role: Drives LED directly via OUT pin; RST pin disables blinking during sleep mode. Use Value: ±20 mA drive strength eliminates external transistor; 1.024 ms–9.54 hr range covers all clinical UI timing needs. | Use Scenario: Times maintenance alerts in railway axle bearing monitors subjected to 50 g shock and wide thermal swings. IC Role / Device Role / Timing Role: Delivers stable 3-hour interval pulses despite mechanical vibration-induced supply noise. Use Value: Internal POR and 100 pF DIV pin capacitance limit ensure robust start-up; ±0.005 %/°C drift maintains accuracy across –40°C to 125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-frequency oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6991IS6#TRPBF | Same architecture and pinout; rated for –40°C to +85°C (I-grade), not AEC-Q100 qualified | Suitable for industrial controls but not automotive under-hood use | Select when ambient temperature stays below 85°C and automotive qualification is unnecessary |
| MAX6373KA+T | Fixed 1.2 s watchdog timer only; no programmable period or reset-triggered truncation | Provides basic reset-on-timeout; lacks flexible interval generation or polarity control | Choose only for simple watchdog-only functions where programmability is not required |
Compared with LTC6991IS6#TRPBF, the LTC6991HS6#WTRPBF adds AEC-Q100 qualification and extended high-temp operation, while MAX6373KA+T trades full programmability for lower cost and simpler integration in non-timing-critical systems.
Availability
LTC6991HS6#WTRPBF is available at Aetrix Electronics and suitable for automotive safety systems, industrial intervalometers, and battery-powered medical devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC6991HS6#WTRPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The TimerBlox® family - including LTC6991HS6#WTRPBF - was engineered specifically for precision, low-power, long-duration timing in space-constrained and thermally demanding applications where crystal oscillators are impractical.
FAQ
What is the operating temperature range of the LTC6991HS6#WTRPBF?
The LTC6991HS6#WTRPBF is specified for operation from –40°C to +125°C and is AEC-Q100 qualified for automotive Grade H applications. This rating is confirmed in the official Analog Devices datasheet Rev. D, Absolute Maximum Ratings and Specified Temperature Range tables, and applies specifically to the HS6#WTRPBF variant with TSOT-23 packaging.
How does the reset function work on the LTC6991HS6#WTRPBF?
The reset function on the LTC6991HS6#WTRPBF truncates the output pulse without stopping the internal master oscillator. When RST is asserted (state depends on POL bit), the output latch is immediately forced to a defined level (0 or 1), shortening the current period. The LTC6991HS6#WTRPBF continues counting internally, ensuring timing continuity - essential for synchronized wake-up in power-gated systems.
Can the LTC6991HS6#WTRPBF generate sub-1 Hz frequencies?
Yes, the LTC6991HS6#WTRPBF supports output frequencies down to 29.1 µHz (period up to 34,360 seconds ≈ 9.54 hours) using NDIV = 221 and RSET = 800 kΩ. This capability is explicitly verified in the Electrical Characteristics table (tOUT = 34,360 s, fOUT = 29.1 µHz) and enables ultra-low-power periodic wake-up in remote sensor nodes.
What package type is used for the LTC6991HS6#WTRPBF?
The LTC6991HS6#WTRPBF uses the 6-lead plastic TSOT-23 (S6) package, measuring 2.9 mm × 1.6 mm × 1.0 mm. This low-profile package is RoHS-compliant and features gull-wing leads - confirmed in the Order Information table and Pin Configuration diagram of the LTC6991 datasheet Rev. D.
Is the LTC6991HS6#WTRPBF pin-compatible with other TimerBlox oscillators?
No - the LTC6991HS6#WTRPBF is not pin-compatible with other TimerBlox devices (e.g., LTC6990, LTC6992, LTC6993, LTC6994). Each TimerBlox part has distinct pin functions and configurations; the LTC6991HS6#WTRPBF's unique 6-pin SOT-23 layout with dedicated SET, DIV, and RST pins is specific to its programmable low-frequency oscillator architecture.
LTC6991HS6#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- TimerBlox®
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Oscillator, Silicon
- Count:
- -
- Frequency:
- 29.1µHz ~ 977Hz
- Voltage - Supply:
- 2.25V ~ 5.5V
- Current - Supply:
- 135 µA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- TSOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
LTC6991HS6#WTRPBF FAQ
1.How can I place an order for LTC6991HS6#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6991HS6#WTRPBF 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 LTC6991HS6#WTRPBF reliable?
The price and inventory of LTC6991HS6#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6991HS6#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC6991HS6#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6991HS6#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6991HS6#WTRPBF?
LTC6991HS6#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6991HS6#WTRPBF 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 LTC6991HS6#WTRPBF?
For technical support, including LTC6991HS6#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6991HS6#WTRPBF requirements.
6.How does Aetrix verify that LTC6991HS6#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6991HS6#WTRPBF 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 LTC6991HS6#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC6991HS6#WTRPBF?
All LTC6991HS6#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6991HS6#WTRPBF, 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 LTC6991HS6#WTRPBF part is unused and in its original packaging.
Return procedure for LTC6991HS6#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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