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Analog Devices Inc. LTC6991CDCB#TRPBF
- Part No.:
- LTC6991CDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC6991CDCB#TRPBF.pdf
- Description:
- IC OSC SILICON PROG 6-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
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Product details
Overview
LTC6991CDCB#TRPBF from Analog Devices is a programmable silicon oscillator IC designed for long-duration timing events, delivering precise clock periods from 1.024 ms to 9.54 hours (29.1 µHz to 977 Hz) with ±1.5% max frequency accuracy over temperature. It features a 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 the DIV pin. It serves as a low-power "heartbeat" or wake-up timer in battery-powered industrial sensors.
For engineers reviewing the LTC6991CDCB#TRPBF datasheet, LTC6991CDCB#TRPBF pinout, LTC6991CDCB#TRPBF application, or LTC6991CDCB#TRPBF equivalent, key selection criteria include its 55–80 µA supply current across 2.25–5.5 V operation, 500 µs start-up time, CMOS 20 mA drive capability, –40°C to 85°C extended temperature range (C-grade), and DFN-6 (2 mm × 3 mm) package compatibility with high-vibration environments.
Technical Context
The LTC6991CDCB#TRPBF implements a master oscillator (1 MHz • 50 kΩ / RSET) followed by a fixed ÷1024 divider and an 8-ratio programmable divider (NDIV), enabling wide-range period tuning without external crystals. Its internal 4-bit A/D converter reads the DIV pin voltage to determine both NDIV and the POL bit, which jointly configure output/reset polarity and division ratio.
Operation relies on regulated VSET = 1.00 V ±30 mV at the SET pin, making frequency setting insensitive to VSET drift when using RSET; accuracy depends solely on resistor tolerance and inherent ±1.5% device error. The RST pin propagates with 16–40 ns delay (supply-dependent) and supports glitch-free DIVCODE updates within one master cycle (tMASTER = 1 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Period Range | 1.024 ms to 34,360 s - enables intervalometer, watchdog, and periodic wake-up functions without external timing components. |
| Frequency Accuracy | ±1.5% max over temp - ensures reliable timing margin for safety-critical timeout circuits without calibration. |
| Supply Current | 55 µA to 80 µA (typ) - supports multi-year battery life in portable equipment operating at 2.25–5.5 V. |
| Start-Up Time | 500 × tMASTER (≤8 ms typ) - guarantees deterministic initialization after power-on reset, critical for synchronized system boot. |
| Output Drive | ±20 mA CMOS - directly drives logic inputs, LEDs, or MOSFET gates without buffer stages. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood applications per AEC-Q100 (I-grade variant). |
| Package | 6-lead DFN (2 mm × 3 mm, 1 mm height) - enables compact PCB layout in space-constrained embedded modules. |
Pinout & Package
Package: 6-lead plastic DFN (DCB), 2 mm × 3 mm, 1 mm profile, exposed pad (Pin 7) connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 6) | Oscillator output | CMOS rail-to-rail signal with 30 Ω output impedance; sources/sinks 20 mA; polarity set by POL bit. |
| GND (Pin 2) | Ground reference | Low-inductance return path for all internal circuitry; exposed pad must be connected to PCB ground plane. |
| RST (Pin 1) | Reset control input | Active state (high/low) determined by POL bit; resets output latch without halting internal oscillator. |
| V+ (Pin 5) | Power supply | 2.25–5.5 V single supply; requires 0.1 µF ceramic bypass capacitor directly to GND. |
| DIV (Pin 4) | Divider/polarity select | V+-referenced analog input; 4-bit A/D sets NDIV and POL; ≤100 pF capacitance required for stable settling. |
| SET (Pin 3) | Frequency programming | Regulated 1.00 V input; ISET = VSET/RSET programs master oscillator; ≤10 pF capacitance preserves jitter performance. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor frequency setting | Eliminates crystal, trimmer, or DAC; RSET tolerance directly defines timing accuracy (e.g., 0.5% resistor → ±0.5% period error). |
| Reset-triggered duty-cycle truncation | Enables precise pulse-width control independent of base period-ideal for heartbeat signaling or gated power enable. |
| Polarity-configurable I/O | Active-high or active-low RST/OUT behavior selected via resistor-divider on DIV pin-no firmware or external logic needed. |
| Glitch-free DIVCODE update | Internal digital filter prevents spurious output transitions during runtime divider changes-safe for dynamic timing reconfiguration. |
| Low-jitter master oscillator | 15 ppmRMS period jitter (NDIV = 1) ensures stable edge placement in timing-critical sampling or synchronization tasks. |
Applications
| Industrial Intervalometer | Battery-Powered Wake-Up Timer |
|---|---|
Use Scenario: Scheduled data acquisition from environmental sensors in remote monitoring nodes. IC Role / Device Role / Timing Role: Generates precise 10-minute intervals to power up microcontroller and ADC, then trigger measurement sequence. Use Value: Reduces average system current to <10 µA by enabling full sleep between intervals; eliminates need for RTC backup battery. | Use Scenario: Low-duty-cycle telemetry transmission in asset trackers powered by coin-cell batteries. IC Role / Device Role / Timing Role: Provides 3570-second (≈1-hour) wake-up pulse to activate RF module and GPS only when location update is required. Use Value: Extends battery life beyond 5 years by limiting active time to <100 ms per cycle; leverages ±1.5% accuracy to meet regulatory beaconing intervals. |
| Automotive Watchdog Timer | High-Vibration System Heartbeat |
Use Scenario: Safety-critical ECU supervision where processor lockup must trigger hardware reset within 2 seconds. IC Role / Device Role / Timing Role: Monitors microcontroller's periodic "alive" signal on RST pin; asserts reset if missing for >2 s (NDIV = 32, RSET = 316 kΩ). Use Value: Meets ASIL-B timing integrity requirements with guaranteed ±1.5% accuracy over –40°C to +125°C (H-grade variants); immune to EMI-induced false triggers. | Use Scenario: Structural health monitoring in aerospace actuators subject to 20 g shock and 10–2000 Hz vibration. IC Role / Device Role / Timing Role: Generates 1 Hz "heartbeat" signal to verify real-time operation of control loop firmware. Use Value: Silicon oscillator avoids quartz fragility; DFN package withstands mechanical stress; 55 µA current minimizes thermal drift in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-frequency oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6375CSA+ | Fixed 1.0 s watchdog timeout; no programmable period or reset polarity; higher quiescent current (2.5 µA min). | Only suitable for fixed-interval reset-not adaptable to variable wake-up or intervalometer needs. | Select only when a simple, pre-calibrated timeout is sufficient and board space permits SO-8 package. |
| DS1086L+T&R | Tri-state I²C interface; 16-step programmable frequency; 2.7–5.5 V supply; ±2% accuracy; 100 µA typical supply current. | Requires MCU interaction for configuration; unsuitable for standalone timing without host controller. | Choose when dynamic frequency adjustment via firmware is required and I²C bus is available. |
Compared with MAX6375CSA+ and DS1086L+T&R, the LTC6991CDCB#TRPBF offers uniquely wide period range (ms to hours), zero-firmware configuration via resistors, lowest supply current in its class, and polarity flexibility-making it optimal for autonomous, ultra-low-power timing where MCU resources or board area are constrained.
Availability
LTC6991CDCB#TRPBF is available at Aetrix Electronics and suitable for industrial intervalometers, battery-powered wake-up timers, and automotive watchdog systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC6991CDCB#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC6991CDCB#TRPBF belongs to the TimerBlox® family-designed specifically for robust, crystal-free, long-duration timing in resource-constrained embedded systems where reliability, low power, and minimal external components are essential.
FAQ
What is the minimum and maximum clock period supported by the LTC6991CDCB#TRPBF?
The LTC6991CDCB#TRPBF supports an output clock period range from 1.024 milliseconds to 34,360 seconds (9.54 hours), achieved through internal master oscillator scaling and eight programmable divider ratios (NDIV = 1 to 2²¹). This range is confirmed in the Electrical Characteristics table (tOUT = 1.024 ms to 34,360 s) and applies across the full –40°C to +85°C operating temperature range for this C-grade part.
How does the RST pin function when the POL bit is set to 1?
When the POL bit is set to 1 (via DIV pin voltage), the RST pin becomes active-low: pulling RST low forces the OUT pin high (reset state), while pulling RST high allows normal oscillation. This behavior is defined in Table 2 ("Output States") and verified in Figures 3–4 of the datasheet. The LTC6991CDCB#TRPBF maintains internal oscillation regardless of RST state-only the output latch is affected.
Can the LTC6991CDCB#TRPBF operate from a 2.25 V supply, and what is its typical supply current at that voltage?
Yes, the LTC6991CDCB#TRPBF operates from 2.25 V to 5.5 V. At V+ = 2.25 V and RSET = 800 kΩ, its typical supply current is 55 µA (max 85 µA), as specified in the Electrical Characteristics table under "IS Supply Current". This ultra-low current enables multi-year operation from primary lithium cells.
What package type and dimensions does the LTC6991CDCB#TRPBF use?
The LTC6991CDCB#TRPBF uses a 6-lead plastic DFN package (DCB), measuring 2 mm × 3 mm with 1 mm height and an exposed thermal pad (Pin 7) connected to GND. This footprint is documented in the "ORDER INFORMATION" section and "PIN CONFIGURATION" diagram (page 2), and is distinct from the TSOT-23 option (S6 package).
Is the LTC6991CDCB#TRPBF AEC-Q100 qualified, and what temperature grade does it support?
The LTC6991CDCB#TRPBF is not AEC-Q100 qualified; it is rated for the commercial/industrial temperature range of –40°C to +85°C (I-grade specification). AEC-Q100 qualification applies only to designated automotive variants such as LTC6991IS6#WTRPBF. The "C" suffix in LTC6991CDCB#TRPBF denotes the 0°C to +70°C specified range, but the device is tested and guaranteed functional from –40°C to +85°C per Note 2.
LTC6991CDCB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- TimerBlox®
- Package/Case:
- 6-WFDFN Exposed Pad
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 6-DFN (2x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6991CDCB#TRPBF FAQ
1.How can I place an order for LTC6991CDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6991CDCB#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 LTC6991CDCB#TRPBF reliable?
The price and inventory of LTC6991CDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6991CDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6991CDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6991CDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6991CDCB#TRPBF?
LTC6991CDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6991CDCB#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 LTC6991CDCB#TRPBF?
For technical support, including LTC6991CDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6991CDCB#TRPBF requirements.
6.How does Aetrix verify that LTC6991CDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6991CDCB#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 LTC6991CDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6991CDCB#TRPBF?
All LTC6991CDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6991CDCB#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 LTC6991CDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC6991CDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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