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Analog Devices Inc. LTC2918CDDB-B1#TRPBF
- Part No.:
- LTC2918CDDB-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918CDDB-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,380
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Product details
Overview
LTC2918CDDB-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with manual reset input, 9 selectable supply thresholds (including adjustable 0.5V mode), fixed –5% tolerance, and windowed watchdog timer. It operates from 1.5V to 5.5V supply, consumes 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 85°C, and delivers 200ms internal reset timeout - used in automotive control systems for reliable power-up sequencing and fault recovery.
For engineers reviewing the LTC2918CDDB-B1#TRPBF datasheet, LTC2918CDDB-B1#TRPBF pinout, LTC2918CDDB-B1#TRPBF application, or LTC2918CDDB-B1#TRPBF equivalent, key selection criteria include its B1 version's windowed watchdog (tWDL = 50ms / tWDU = 1.6s), MR pin compatibility with push-button interfaces, DFN-10 (3mm × 2mm) package, and guaranteed RST assertion down to VCC ≥ 0.8V for brown-out detection.
Technical Context
The LTC2918CDDB-B1#TRPBF implements a dual-stage supervision architecture: a high-accuracy comparator monitors VM against one of nine factory-programmed thresholds selected by SEL1/SEL2 logic states, while a dedicated windowed watchdog circuit validates WDI falling-edge timing between lower (50ms) and upper (1.6s) boundaries. Its internal 6.2V shunt regulator enables direct operation from supplies up to 12V when paired with an external series resistor.
Reset timing is configurable via RT pin: open-circuit yields ~400μs, tie-to-VCC gives 200ms, or external capacitor sets precise timeout (e.g., 2.2nF → 20ms). The MR input features 100kΩ internal pull-up and responds to pulses ≥250ns, enabling hardware-initiated resets without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to common logic rails; shunt regulation extends usable range to 12V with series resistor |
| Threshold Accuracy | ±1.5% over –40°C to 85°C - ensures reliable trip point margining against supply tolerances (e.g., 5V±10% monitored at 4.425V nominal) |
| Quiescent Current | 30μA typical - enables battery-backed or low-power embedded monitoring without significant system drain |
| Reset Timeout | 200ms internal (RT tied to VCC) - provides sufficient hold time for microcontroller initialization and peripheral stabilization |
| Watchdog Window | tWDL = 50ms / tWDU = 1.6s (B1 version) - detects both stuck and excessively fast WDI toggling, critical for safety-critical automotive firmware validation |
| VM Input Impedance | 0.5–8MΩ - minimizes loading on monitored supply; supports high-ratio resistive dividers for ADJ-mode threshold setting |
| RST Output Type | Open-drain - allows wired-OR of multiple supervisors and interface with 3.3V/5V logic families using external pull-up |
Pinout & Package
Package: 10-Lead (3mm × 2mm) Plastic DFN with exposed pad (pin 11, optional GND connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal circuits; must be low-impedance connection to PCB ground plane |
| MR (Pin 2) | Manual reset input | Active-low input with 100kΩ internal pull-up; accepts momentary button press without external components |
| SEL2 (Pin 3) | Threshold select bit | Three-state input (VCC/GND/open) selecting one of nine nominal voltages per Table 1; leakage ≤ ±5μA in open state |
| SEL1 (Pin 4) | Threshold select bit | Three-state input working with SEL2 to configure VM trip point (e.g., SEL1=Open, SEL2=Open → 1.8V nominal) |
| VM (Pin 5) | Monitored voltage input | High-impedance comparator input; connects directly to supply rail or resistive divider tap for ADJ-mode (0.5V reference) |
| RST (Pin 6) | Reset output | Open-drain output asserting low during undervoltage or watchdog fault; requires external pull-up resistor |
| RT (Pin 7) | Reset timeout control | Capacitor-connected pin setting tRST = 9ms/nF; tie to VCC for fixed 200ms timeout |
| WT (Pin 8) | Watchdog timeout control | Capacitor-connected pin setting tWDU = 72ms/nF; tie to VCC for fixed 1.6s windowed timeout |
| WDI (Pin 9) | Watchdog input | Edge-sensitive input requiring falling edges within 50ms–1.6s window; VIH = 1.1V, VIL = 0.4V |
| VCC (Pin 10) | Power supply input | Accepts 1.5–5.5V directly; internal 6.2V shunt enables >5.7V operation with current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer (B1 version) | Enforces strict timing discipline on microcontroller firmware by rejecting both missed and overly frequent WDI transitions |
| Manual reset with integrated pull-up | Eliminates need for external resistor or RC network - simplifies board layout and reduces BOM count for field-serviceable systems |
| 9-pin-selectable thresholds including ADJ mode | Supports monitoring of 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1V, and user-defined 0.5V-based points without external resistors |
| Guaranteed RST assertion down to VCC = 0.8V | Ensures robust power-on reset even during severe brown-out conditions before internal circuitry becomes functional |
| Glitch-immune comparator with tUV = 10–150μs | Rejects short-duration supply noise (e.g., switching regulator ripple) without compromising DC threshold accuracy |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply and 12V sensor bus in under-hood ECU exposed to –40°C to 125°C ambient. IC Role / Device Role / Timing Role: Voltage supervisor with windowed watchdog validating MCU firmware execution and asserting RST on supply collapse or software hang. Use Value: Prevents unsafe actuator behavior by enforcing deterministic reset on undervoltage or watchdog timeout, meeting ASIL-B functional safety requirements. | Use Scenario: Supervises 3.3V FPGA configuration rail and 24V field power in modular PLC base unit. IC Role / Device Role / Timing Role: Dual-threshold monitor using SEL1/SEL2 to independently supervise logic and I/O supplies; MR pin enables field technician-initiated reconfiguration. Use Value: Enables hot-swap capability and maintenance without full system shutdown, reducing downtime in continuous-process automation. |
| Telecom Base Station Power Management | Medical Infusion Pump Controller |
Use Scenario: Ensures clean power-up sequence for multi-rail DSP and RF front-end in 4G/LTE macrocell base station. IC Role / Device Role / Timing Role: Primary supervisor generating synchronized reset across voltage domains; RT pin configured for 200ms timeout to match FPGA configuration time. Use Value: Eliminates race conditions during power-up by guaranteeing all subsystems remain held in reset until stable, improving boot reliability. | Use Scenario: Monitors 1.8V microcontroller core supply and 5V motor driver rail in battery-powered infusion pump with strict safety certification. IC Role / Device Role / Timing Role: Safety-critical supervisor using windowed watchdog to detect MCU lockup and trigger immediate motor shutdown via RST-driven latch. Use Value: Meets IEC 62304 Class C software safety requirements by providing hardware-enforced fail-safe response to processor faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT46D3+T | Fixed 4.63V threshold, no manual reset, no watchdog, SOT23-5 package | Suitable only for single-rail monitoring without timing supervision or field reset capability | Select when cost and footprint are primary constraints and windowed watchdog/MR are unnecessary |
| TPS3808G33DBVR | Fixed 3.3V threshold, adjustable watchdog (non-windowed), no MR, SOT23-6 package | Lacks windowed timing enforcement and hardware reset button support; requires external pull-up on MR-equivalent pin | Choose for simpler watchdog use cases where falling-edge-only validation and push-button reset are not required |
Compared with MAX6326UT46D3+T and TPS3808G33DBVR, the LTC2918CDDB-B1#TRPBF offers unique integration of 9-selectable thresholds, B1 windowed watchdog, and MR pin in a compact DFN-10 - making it optimal for space-constrained, safety-aware designs requiring flexible supervision and field serviceability.
Availability
LTC2918CDDB-B1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLC modules, telecom base station power management, and medical infusion pump controllers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC2918CDDB-B1#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand precision power management and reliability solutions.
The LTC2918 belongs to ADI's precision voltage supervisor product line, designed specifically for mission-critical applications demanding guaranteed threshold accuracy, glitch immunity, and robust watchdog supervision in harsh environments like automotive and industrial settings.
FAQ
What is the operating temperature range for the LTC2918CDDB-B1#TRPBF?
The LTC2918CDDB-B1#TRPBF is specified for commercial-grade operation from 0°C to 70°C. Its DFN-10 package and internal design support reliable performance across this range, with guaranteed ±1.5% threshold accuracy and functional watchdog/reset behavior throughout. For extended temperature applications, consider the LTC2918IDDB-B1#TRPBF (–40°C to 85°C) or LTC2918HDDB-B1#TRPBF (–40°C to 125°C) variants.
How does the windowed watchdog function differ between LTC2918CDDB-B1#TRPBF and non-B versions?
The LTC2918CDDB-B1#TRPBF implements a true windowed watchdog requiring WDI falling edges to occur strictly between tWDL = 50ms and tWDU = 1.6s. Non-B versions (e.g., A1) only enforce the upper boundary. This dual-boundary enforcement prevents both software hangs and runaway loops, making the LTC2918CDDB-B1#TRPBF suitable for ASIL-B and SIL-2 safety applications where deterministic fault coverage is mandatory.
Can the LTC2918CDDB-B1#TRPBF monitor a 12V supply directly?
Yes - the LTC2918CDDB-B1#TRPBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. Connect the 12V source through a series current-limiting resistor (e.g., 11kΩ) to VCC, bypass VCC to GND with 0.1μF ceramic, and configure SEL1/SEL2 for 12V threshold mode. The shunt regulator clamps VCC to ~6.2V while sinking excess current, enabling safe operation without external LDOs or regulators.
What is the minimum pulse width required on the MR pin of the LTC2918CDDB-B1#TRPBF?
The MR pin of the LTC2918CDDB-B1#TRPBF requires a minimum pulse width of 250ns to reliably trigger a manual reset. This specification ensures compatibility with standard push-button switches and digital GPIO outputs. When asserted low, MR initiates a full reset cycle: RST goes low immediately and remains asserted for the configured reset timeout period (e.g., 200ms when RT is tied to VCC), after which RST releases to allow system restart.
Does the LTC2918CDDB-B1#TRPBF support adjustable reset timeout using an external capacitor?
Yes - the LTC2918CDDB-B1#TRPBF supports adjustable reset timeout via the RT pin. Connecting a capacitor CRT from RT to GND sets tRST ≈ 9ms/nF (e.g., 2.2nF yields ~20ms). Leaving RT open gives ~400μs; tying RT to VCC selects the fixed 200ms internal timeout. This flexibility allows precise matching of reset hold time to microcontroller boot sequences, FPGA configuration windows, or power supply settling times without modifying firmware.
LTC2918CDDB-B1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 27 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2918CDDB-B1#TRPBF FAQ
1.How can I place an order for LTC2918CDDB-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CDDB-B1#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 LTC2918CDDB-B1#TRPBF reliable?
The price and inventory of LTC2918CDDB-B1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2918CDDB-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918CDDB-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CDDB-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CDDB-B1#TRPBF?
LTC2918CDDB-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CDDB-B1#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 LTC2918CDDB-B1#TRPBF?
For technical support, including LTC2918CDDB-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CDDB-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2918CDDB-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CDDB-B1#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 LTC2918CDDB-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918CDDB-B1#TRPBF?
All LTC2918CDDB-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CDDB-B1#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 LTC2918CDDB-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918CDDB-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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