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Analog Devices Inc. LTC6991MPS6#TRPBF
- Part No.:
- LTC6991MPS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC6991MPS6#TRPBF.pdf
- Description:
- IC OSC SILICON PROG TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,226
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Product details
Overview
LTC6991MPS6#TRPBF from Analog Devices is a silicon-based low-frequency oscillator IC with programmable period range from 1.024 ms to 34,360 seconds (29.1 µHz to 977 Hz), designed for long-duration timing events in harsh environments. It features single-resistor frequency setting (RSET = 50 kΩ to 800 kΩ), 8 selectable divider ratios (NDIV = 1 to 2²¹), and active-high/active-low configurable reset and output polarity via DIV pin voltage. It serves as a precision "heartbeat" or wake-up timer in battery-powered industrial sensors.
For engineers reviewing the LTC6991MPS6#TRPBF datasheet, LTC6991MPS6#TRPBF pinout, LTC6991MPS6#TRPBF application, or LTC6991MPS6#TRPBF equivalent, key selection criteria include its –55°C to 125°C extended temperature rating, ±1.5% max frequency error over temperature, 55–80 µA supply current, CMOS 20 mA drive capability, and SOT-23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC6991MPS6#TRPBF implements a master oscillator (1 MHz • 50 kΩ / RSET) followed by a fixed ÷1024 stage and an 8-ratio programmable divider (NDIV). Its internal 4-bit A/D converter reads DIV pin voltage (VDIV) to determine both NDIV and POL bit-enabling simultaneous frequency and polarity configuration without digital interface.
Reset functionality operates independently of oscillation: when RST is asserted (level determined by POL), the output latch is forced to a defined state (0 or 1) while the internal master clock continues running. Start-up time is 500 × tMASTER (typ. 500 µs at fMASTER = 2 MHz), and the device includes power-on reset (POR) and ISET-based halt detection (<500 nA halts oscillation).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Period Range | 1.024 ms to 34,360 s - supports intervalometers, watchdog timeouts, and periodic wake-up intervals up to 9.54 hours |
| Frequency Accuracy | ±1.5% max over –55°C to 125°C - enables reliable timing without external calibration in automotive or industrial deployments |
| Supply Current | 55 µA to 80 µA at V+ = 2.25–5.5 V - allows multi-year operation on coin cells in remote monitoring nodes |
| Output Drive | ±20 mA CMOS - directly drives logic inputs, LEDs, or MOSFET gates without buffer stages |
| Operating Temp | –55°C to 125°C - qualified per AEC-Q100 Grade MP, suitable for under-hood or downhole electronics |
| Start-Up Time | 500 µs typical - ensures rapid system readiness after cold boot or brown-out recovery |
| Reset Propagation | 16 ns at V+ = 5.5 V - enables precise pulse truncation for duty-cycle control in timing-critical sequences |
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 | Level-triggered (active-high or active-low per POL bit); asserts within 16 ns to force OUT to fixed state without stopping internal oscillator |
| GND (Pin 2) | Analog/digital ground reference | Low-inductance return path for SET, DIV, and output driver; must connect to solid ground plane |
| SET (Pin 3) | Frequency-setting current input | Sinks 1.25–20 µA (ISET = 1 V / RSET); regulates VSET to 1.00 V ±30 mV; <10 pF capacitance required for stability |
| OUT (Pin 6) | CMOS clock output | Full-rail swing (GND to V+), 30 Ω output impedance, ±20 mA drive; polarity matches RST per POL bit |
| V+ (Pin 5) | Power supply input | 2.25 V to 5.5 V operation; requires local 0.1 µF ceramic bypass to GND; noise-sensitive analog rail |
| DIV (Pin 4) | Divider/polarity programming input | V+–referenced 4-bit A/D input; sets NDIV (1–2²¹) and POL bit via VDIV/V+ ratio; <100 pF capacitance limit for fast settling |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor frequency programming | Eliminates need for crystal, trimmer, or digital interface - reduces BOM count and layout complexity in cost-sensitive designs |
| Configurable reset polarity | Enables direct interface with both active-high and active-low microcontroller wake-up inputs without external inverters |
| Glitch-free DIVCODE update | Allows dynamic frequency reconfiguration mid-operation with no output glitches or metastability risk |
| Internal POR and ISET halt detection | Guarantees known output state at power-up and prevents spurious oscillation if RSET opens or drifts out of range |
| Low-jitter master oscillator | 15 ppmRMS period jitter (NDIV = 1) ensures stable edge placement for time-of-flight or phase-sensitive measurements |
Applications
| Industrial Intervalometer | Automotive Watchdog Timer |
|---|---|
Use Scenario: Periodic data sampling in oil/gas pipeline corrosion monitors deployed in remote desert locations. IC Role / Device Role / Timing Role: Generates precise 30-minute wake-up pulses to power sensor ADC and RF transmitter only during measurement windows. Use Value: Extends battery life from 6 months to >5 years by eliminating continuous MCU sleep-mode leakage and enabling full system shutdown between cycles. | Use Scenario: Safety-critical ECU monitoring where loss of communication must trigger fail-safe shutdown within 2 seconds. IC Role / Device Role / Timing Role: Provides independent, temperature-stable timeout signal to reset microcontroller if main software loop hangs. Use Value: Meets ISO 26262 ASIL-B requirements with ±1.5% accuracy over –40°C to 125°C, eliminating need for redundant crystal-based timers. |
| Portable Medical Alert Beacon | High-Vibration Equipment Monitor |
Use Scenario: Wearable fall-detection pendant that transmits GPS location every 90 seconds when motion is absent. IC Role / Device Role / Timing Role: Acts as ultra-low-power wake-up timer triggering BLE transmission circuitry only at scheduled intervals. Use Value: Achieves 3.2 µA average system current using 55 µA quiescent draw and 500 µs start-up - enables CR2032 battery life >24 months. | Use Scenario: Structural health monitoring on wind turbine gearboxes subject to 50 g shock and thermal cycling. IC Role / Device Role / Timing Role: Generates synchronized 10-second sampling windows for vibration FFT analysis across distributed sensor nodes. Use Value: Maintains timing integrity across –55°C to 125°C without oven-controlled crystal, reducing size, weight, and power vs. TCXO solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-frequency oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6991HDCB#TRPBF | Same core oscillator, but in 2 mm × 3 mm DFN package with exposed thermal pad; higher θJC (10.6°C/W) vs. SOT-23's 51°C/W | Better thermal performance in high-power-density boards; less suitable for ultra-thin handhelds due to 0.75 mm height | Select when board-level thermal management prioritizes junction-to-case conduction over footprint minimization |
| TPS65910A3RSLR | Integrated PMIC with built-in 32.768 kHz RTC oscillator only; no programmable low-frequency output or reset function | Provides system power sequencing + real-time clock, but cannot replace LTC6991MPS6#TRPBF's sub-Hz to kHz programmable timing | Choose only if primary need is RTC backup and power management-not standalone precision interval generation |
Compared with LTC6991HDCB#TRPBF, the LTC6991MPS6#TRPBF offers smaller footprint and lower profile for space-constrained modules, while TPS65910A3RSLR lacks programmable period, reset control, and wide frequency range-making it unsuitable as a functional substitute.
Availability
LTC6991MPS6#TRPBF is available at Aetrix Electronics and suitable for industrial intervalometers, automotive watchdog systems, portable medical beacons, and high-vibration equipment monitors requiring stable component supply across extended temperature ranges.
Supply support for LTC6991MPS6#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 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 LTC6991MPS6#TRPBF-is engineered for robust, crystal-free timing in applications where mechanical reliability, temperature resilience, and minimal external components are critical.
FAQ
What is the guaranteed operating temperature range for LTC6991MPS6#TRPBF?
The LTC6991MPS6#TRPBF is specified for –55°C to 125°C operation and is AEC-Q100 qualified for automotive Grade MP applications. This rating is validated across all electrical parameters including frequency accuracy (±1.5% max), supply current (55–80 µA), and reset propagation delay (≤40 ns), ensuring reliable timing in extreme under-hood or industrial environments where standard commercial-grade oscillators would fail.
How does the DIV pin configure both frequency division and output polarity in LTC6991MPS6#TRPBF?
The DIV pin on LTC6991MPS6#TRPBF connects to an internal V+-referenced 4-bit A/D converter that produces a DIVCODE value (0–15). The MSB of DIVCODE is the POL bit, which determines whether RST and OUT are active-high (POL = 0) or active-low (POL = 1). The remaining 3 bits select NDIV from eight values (1, 8, 64, ..., 2²¹). A resistor divider between V+ and GND sets VDIV to achieve the target VDIV/V+ ratio per Table 1 in the datasheet.
Can LTC6991MPS6#TRPBF generate a precise 1 Hz output, and what resistor values are required?
Yes, LTC6991MPS6#TRPBF can generate 1 Hz (1000 ms period) with ±1.5% accuracy. Using NDIV = 64 (DIVCODE = 2, POL = 0) and Equation RSET = (50 kΩ / 1.024 ms) × (1000 ms / 64) = 763 kΩ, a standard 768 kΩ 1% metal-film resistor yields –0.7% error. Pair with R1 = 976 kΩ and R2 = 182 kΩ on the DIV pin to set VDIV/V+ = 0.15625 ±1.5%, as confirmed in Table 1 of the LTC6991 datasheet.
What is the minimum RSET value supported by LTC6991MPS6#TRPBF, and what happens below it?
LTC6991MPS6#TRPBF supports RSET from 50 kΩ to 800 kΩ (ISET = 1.25 µA to 20 µA). Below 50 kΩ, ISET exceeds 20 µA and violates the absolute maximum rating for SET pin current. Operation below this threshold risks parametric shift, increased jitter, or failure to regulate VSET accurately. The device halts oscillation if ISET drops below ~500 nA, providing fail-safe behavior for open-RSET faults.
Does LTC6991MPS6#TRPBF require external capacitors for stable operation?
LTC6991MPS6#TRPBF requires only a 0.1 µF ceramic capacitor between V+ and GND, placed as close as possible to the pins. No external timing capacitors are needed-the oscillator is resistor-programmed. Capacitance on SET and DIV pins must be limited to <10 pF and <100 pF respectively to prevent jitter increase, slow A/D settling, or startup failures. These constraints are design-critical and verified in characterization data (Figures G13, G14, G15).
LTC6991MPS6#TRPBF 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:
- -55°C ~ 125°C
- Supplier Device Package:
- TSOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6991MPS6#TRPBF FAQ
1.How can I place an order for LTC6991MPS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6991MPS6#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 LTC6991MPS6#TRPBF reliable?
The price and inventory of LTC6991MPS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6991MPS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6991MPS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6991MPS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6991MPS6#TRPBF?
LTC6991MPS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6991MPS6#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 LTC6991MPS6#TRPBF?
For technical support, including LTC6991MPS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6991MPS6#TRPBF requirements.
6.How does Aetrix verify that LTC6991MPS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6991MPS6#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 LTC6991MPS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6991MPS6#TRPBF?
All LTC6991MPS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6991MPS6#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 LTC6991MPS6#TRPBF part is unused and in its original packaging.
Return procedure for LTC6991MPS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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