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Analog Devices Inc. LTC6991HDCB#TRPBF
- Part No.:
- LTC6991HDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Programmable Timers and Oscillators
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC6991HDCB#TRPBF.pdf
- Description:
- IC OSC SILICON PROG 6-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
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Product details
Overview
LTC6991HDCB#TRPBF from Analog Devices is a silicon-based low-frequency oscillator IC with programmable clock period from 1.024 ms to 34,360 seconds (29.1 µHz to 977 Hz), designed for long-duration timing in harsh environments. It features 50% duty cycle output, active-high/active-low configurable RST/OUT polarity via DIV pin voltage, and operates from 2.25 V to 5.5 V supply across –40°C to +125°C. Used in automotive watchdog timers and battery-powered intervalometers.
For engineers reviewing the LTC6991HDCB#TRPBF datasheet, LTC6991HDCB#TRPBF pinout, LTC6991HDCB#TRPBF application, or LTC6991HDCB#TRPBF equivalent, key selection criteria include guaranteed operation up to +125°C, ±1.5% max frequency error over temperature, 55–80 µA supply current, 6-pin DFN (2 mm × 3 mm) package, and reset propagation delay under 40 ns at 2.25 V.
Technical Context
The LTC6991HDCB#TRPBF integrates a master oscillator (1 MHz max) controlled by SET pin current (ISET = VSET/RSET), followed by a fixed ÷1024 divider and an 8-step programmable divider (NDIV = 1, 8, 64, ..., 2²¹). Output period is calculated as tOUT = NDIV × RSET / 50 kΩ × 1.024 ms, with RSET ranging 50 kΩ to 800 kΩ.
A 4-bit A/D converter on the DIV pin reads VDIV/V+ ratio to determine both NDIV and POL bit (controlling RST/OUT polarity). The internal digital filter ensures glitch-free DIVCODE transitions, and power-on reset holds OUT low for 0.5–8 ms depending on master clock period.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Period Range | 1.024 ms to 34,360 s - supports ultra-low-power wake-up intervals up to 9.54 hours without external RC timing components. |
| Frequency Accuracy | ±1.5% max over –40°C to +125°C - enables reliable timing in automotive engine control and industrial monitoring without calibration. |
| Supply Current | 55 µA to 80 µA at 2.25–5.5 V - allows multi-year operation from coin-cell batteries in portable sensors and IoT endpoints. |
| Operating Temperature | –40°C to +125°C - meets AEC-Q100 Grade H requirements for under-hood automotive applications. |
| Output Drive | ±20 mA CMOS - directly drives logic inputs, LEDs, or small MOSFET gates without external buffers. |
| Reset Propagation Delay | 16–40 ns - ensures precise pulse truncation for sub-microsecond timing control in safety-critical systems. |
| Start-Up Time | 0.5–8 ms - deterministic initialization enables synchronized system wake-up after power recovery. |
Pinout & Package
Package: 6-lead (2 mm × 3 mm) plastic DFN (DCB), exposed pad connected to GND. RoHS-compliant, lead-free finish, tape-and-reel (2500 pcs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 5) | Power supply input | Accepts 2.25 V to 5.5 V; requires local 0.1 µF bypass capacitor to GND for stable oscillator operation. |
| GND (Pin 2) | Ground reference | Low-inductance connection point for all analog and digital return paths; exposed pad must be soldered to PCB ground plane. |
| SET (Pin 3) | Frequency-setting input | Sinks ISET = 1.25–20 µA; voltage regulated to 1.00 V ±30 mV; connects to precision RSET resistor for accurate period programming. |
| OUT (Pin 6) | CMOS oscillator output | Swings rail-to-rail (GND to V+); 30 Ω output impedance; sources/sinks ±20 mA; polarity configured via DIV pin. |
| DIV (Pin 4) | Divider and polarity control | V+ referenced 4-bit A/D input; sets NDIV (1–2²¹) and POL bit (RST/OUT active-high/low) via resistor divider (VDIV/V+ = (DIVCODE + 0.5)/16 ±1.5%). |
| RST (Pin 1) | Output reset control | Asynchronous reset input; behavior depends on POL bit: active-high when POL = 0, active-low when POL = 1; propagates within 40 ns. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable period range | 1.024 ms to 9.54 hours using single RSET resistor and DIV pin voltage - eliminates need for large capacitors or trimming in long-interval designs. |
| Reset-triggered pulse truncation | Enables dynamic duty-cycle reduction without stopping internal oscillator - critical for heartbeat signaling and energy-gated wake-up sequences. |
| Temperature-stable frequency | ±0.005 %/°C drift and ±1.5 % total error over –40°C to +125°C - ensures timing integrity in thermal cycling environments like automotive ECUs. |
| Low-power operation | 55–80 µA supply current across full voltage and temperature range - extends battery life in remote sensors and wearables beyond 5 years. |
| Glitch-free DIVCODE update | Digital filtering guarantees clean frequency transitions during runtime reconfiguration - prevents spurious pulses in safety-monitored systems. |
Applications
| Automotive Watchdog Timer | Industrial Intervalometer |
|---|---|
Use Scenario: Monitors microcontroller health in engine control units and ADAS modules, triggering safe shutdown or reset if no periodic service signal is received within programmed window. IC Role / Device Role / Timing Role: Standalone, fail-safe timing reference generating precise timeout intervals independent of MCU clock stability or software execution. Use Value: Guarantees functional safety compliance (ISO 26262 ASIL-B) via AEC-Q100 Grade H qualification and ±1.5% frequency accuracy over full automotive temperature range. |
Use Scenario: Controls periodic sampling of pressure, temperature, or vibration sensors in oil & gas pipelines or factory floor equipment. IC Role / Device Role / Timing Role: Low-power, high-accuracy interval generator enabling sensor wake-up only during measurement windows to minimize system energy consumption. Use Value: Achieves >5-year battery life using 55 µA typical supply current and 34,360 s maximum period - eliminates need for mains power or frequent maintenance. |
| Portable Medical Device Wake-Up | High-Vibration Equipment Monitor |
Use Scenario: Powers on diagnostic circuitry in wearable ECG or glucose monitors every 30 minutes to capture physiological data and transmit via BLE. IC Role / Device Role / Timing Role: Resettable oscillator providing deterministic, low-jitter wake-up trigger to enable synchronous sensor acquisition and radio transmission. Use Value: 15 ppm RMS period jitter and 500 µs start-up time ensure consistent measurement timing and minimal latency in time-critical diagnostics. |
Use Scenario: Detects abnormal vibration patterns in rotating machinery by initiating accelerometer bursts at precisely spaced intervals (e.g., every 2 seconds). IC Role / Device Role / Timing Role: Robust timing source immune to mechanical shock and EMI due to monolithic silicon oscillator architecture and CMOS output drive. Use Value: Operates reliably at –40°C to +125°C and withstands high-G environments where quartz crystals would fracture or drift unpredictably. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-frequency oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6991IDCB#TRPBF | Same architecture and pinout; rated for –40°C to +85°C (not +125°C) | Not qualified for under-hood automotive or high-temp industrial use | Select when ambient temperature stays below 85°C and cost sensitivity outweighs extended temp grade. |
| LTC6991HS6#TRPBF | Identical electrical specs; TSOT-23-6 package (2.9 mm × 1.6 mm) instead of DFN (2 mm × 3 mm) | Higher thermal resistance (θJA = 192°C/W vs 64°C/W) limits power dissipation in compact layouts | Choose for legacy board compatibility with SOT-23 footprints where space constraints prevent DFN adoption. |
Compared with LTC6991IDCB#TRPBF, the LTC6991HDCB#TRPBF delivers guaranteed operation at +125°C for automotive under-hood use; compared with LTC6991HS6#TRPBF, it offers superior thermal performance in space-constrained DFN layout while maintaining identical timing accuracy and reset functionality.
Availability
LTC6991HDCB#TRPBF is available at Aetrix Electronics and suitable for automotive watchdog timers, industrial intervalometers, and portable medical device wake-up circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC6991HDCB#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 LTC6991HDCB#TRPBF belongs to the TimerBlox® family of silicon timing devices, engineered specifically for long-duration, low-power, high-accuracy timing applications where quartz oscillators are impractical due to size, cost, or environmental limitations.
FAQ
What is the maximum operating temperature specification for the LTC6991HDCB#TRPBF?
The LTC6991HDCB#TRPBF is specified for continuous operation from –40°C to +125°C and is AEC-Q100 qualified for automotive Grade H applications. This rating is confirmed in the Absolute Maximum Ratings and Specified Temperature Range tables of the official Analog Devices datasheet Rev. D, where "LTC6991H" denotes the high-temperature grade variant packaged in the DCB (DFN) form factor.
How does the DIV pin configure both frequency division and output polarity in the LTC6991HDCB#TRPBF?
The DIV pin on the LTC6991HDCB#TRPBF connects to an internal V+-referenced 4-bit A/D converter that determines a DIVCODE value (0–15). The most significant bit (POL) of DIVCODE sets RST/OUT polarity (active-high or active-low), while the remaining bits select NDIV (1, 8, 64, ..., 2²¹). For example, DIVCODE = 2 sets POL = 0 and NDIV = 64, yielding tOUT = 64 × RSET / 50 kΩ × 1.024 ms.
Can the LTC6991HDCB#TRPBF generate a precise 1 Hz output, and what resistor values are required?
Yes, the LTC6991HDCB#TRPBF can generate 1 Hz (tOUT = 1000 ms) using NDIV = 64 and RSET = 763 kΩ per the equation RSET = (50 kΩ / 1.024 ms) × (tOUT / NDIV). A standard 1% 768 kΩ resistor yields –0.7% frequency error. With DIVCODE = 2 (R1 = 976 kΩ, R2 = 182 kΩ), the LTC6991HDCB#TRPBF achieves stable 1 Hz operation across –40°C to +125°C.
What is the supply current range of the LTC6991HDCB#TRPBF, and how does it scale with RSET?
The LTC6991HDCB#TRPBF draws 55–80 µA over its full operating range. Supply current decreases as RSET increases: at RSET = 50 kΩ, IS = 135–170 µA; at RSET = 800 kΩ, IS = 65–100 µA (typical 55–80 µA). This inverse relationship enables ultra-low-power design - e.g., 768 kΩ RSET reduces current to ~68 µA at 3.3 V, supporting >5-year coin-cell operation.
Is the LTC6991HDCB#TRPBF pin-compatible with other TimerBlox devices such as the LTC6992 or LTC6994?
No, the LTC6991HDCB#TRPBF is not pin-compatible with LTC6992 or LTC6994. It uses a 6-pin DFN (DCB) or TSOT-23 (S6) package with dedicated SET, DIV, RST, OUT, V+, and GND pins. In contrast, LTC6992 is an 8-pin device with MOD and FB pins, and LTC6994 is a 12-pin spread-spectrum modulator. Each TimerBlox part has unique pin functions and cannot be substituted without PCB redesign.
LTC6991HDCB#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:
- -40°C ~ 125°C
- Supplier Device Package:
- 6-DFN (2x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC6991HDCB#TRPBF FAQ
1.How can I place an order for LTC6991HDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6991HDCB#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 LTC6991HDCB#TRPBF reliable?
The price and inventory of LTC6991HDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6991HDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6991HDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6991HDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6991HDCB#TRPBF?
LTC6991HDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6991HDCB#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 LTC6991HDCB#TRPBF?
For technical support, including LTC6991HDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6991HDCB#TRPBF requirements.
6.How does Aetrix verify that LTC6991HDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6991HDCB#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 LTC6991HDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6991HDCB#TRPBF?
All LTC6991HDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6991HDCB#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 LTC6991HDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC6991HDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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