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Analog Devices Inc. LTC2908IDDB-B1#TRPBF
- Part No.:
- LTC2908IDDB-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2908IDDB-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 6 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,101
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Product details
Overview
LTC2908IDDB-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage systems. It monitors 3.3V, 2.5V, 1.8V, 1.5V, and two adjustable inputs (VADJ1/VADJ2) with ±1.5% threshold accuracy over –40°C to +85°C, features a 200ms reset timeout, and delivers active-low open-drain RST output with guaranteed operation down to VCC = 0.5V - enabling reliable power sequencing in network servers and optical networking equipment.
For engineers reviewing the LTC2908IDDB-B1#TRPBF datasheet, LTC2908IDDB-B1#TRPBF pinout, LTC2908IDDB-B1#TRPBF application, or LTC2908IDDB-B1#TRPBF equivalent, this page provides verified pin functions, exact B1 variant input thresholds (3.3V/2.5V/1.8V/1.5V), DFN-8 package dimensions, reset timing behavior under brownout, and validated alternative parts for multivoltage monitoring designs.
Technical Context
The LTC2908IDDB-B1#TRPBF implements six independent high-accuracy comparators with internal bandgap reference, each feeding a glitch-immune logic block that triggers a 200ms monostable timer before asserting RST. Its internal VCC auto-select uses the greater of V1 or V2 (up to 6V), eliminating external biasing while maintaining full functionality at ultralow supply voltages (≥0.5V).
Input architecture supports fixed-threshold monitoring (V1–V4) and two 0.5V-referenced adjustable inputs (VADJ1/VADJ2), enabling precise trip points across 0.6V–12V via external resistor dividers. The RST output combines a strong pull-down (≤0.15V @ 5μA, VCC = 0.5V) and weak internal 6μA pull-up to VCC, supporting wired-OR configurations without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Inputs | Monitors 3.3V, 2.5V, 1.8V, 1.5V (fixed) + 2 × adjustable (0.5V reference) |
| Threshold Accuracy | ±1.5% over –40°C to +85°C - reduces system voltage margin requirement vs ±2.5% supervisors |
| Reset Timeout | 200ms nominal (160–260ms) - eliminates noise-induced false resets above 5Hz |
| RST Output Type | Active-low open-drain - enables wired-OR with multiple supervisors or microcontroller reset lines |
| Ultralow VCC Operation | Guaranteed RST low state with VCC ≥ 0.5V - ensures deterministic reset during deep brownout |
| Package | 8-lead (3mm × 2mm) plastic DFN with exposed pad - 1mm profile for space-constrained PCBs |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial and telecom infrastructure environments |
Pinout & Package
8-lead plastic DFN (DDB8) package, 3mm × 2mm footprint, 1mm height, exposed thermal pad (Pin 9, optional GND connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 4) | Device Ground Reference | Primary ground return for all internal circuitry and comparator references |
| RST (Pin 3) | Reset Logic Output | Open-drain output pulled low when any input falls below threshold; held low for 200ms after all recover |
| V4 (Pin 2) | Voltage Input 4 | Fixed 1.5V monitor input (B1 variant); accepts up to 6V, draws ≤2μA quiescent current |
| V2 (Pin 1) | Voltage Input 2 | Fixed 3.3V monitor input (B1 variant); also contributes to internal VCC selection with V1 |
| VADJ2 (Pin 5) | Adjustable Input 2 | 0.5V-referenced comparator input; sets trip point via external resistor divider (e.g., 100kΩ + 511kΩ for 3.3V) |
| V3 (Pin 6) | Voltage Input 3 | Fixed 1.8V monitor input (B1 variant); draws ≤2μA, supports bypass capacitor for noise immunity |
| VADJ1 (Pin 7) | Adjustable Input 1 | 0.5V-referenced comparator input; identical function to VADJ2, enables dual adjustable thresholds |
| V1 (Pin 8) | Voltage Input 1 | Fixed 3.3V monitor input (B1 variant); primary VCC source when ≥ V2, draws 24μA typical |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-immune comparators | First-order low-pass filtering on all six inputs prevents false triggering from sub-5Hz supply transients |
| Wired-OR RST capability | Open-drain output allows multiple LTC2908s to share one reset bus without contention |
| Ultralow-voltage reset hold | Maintains valid RST low state down to VCC = 0.5V - critical for graceful shutdown in battery-backed systems |
| No external timing capacitor | 200ms reset delay generated by internal capacitor - saves board space and component cost |
| Input shorting flexibility | Unused inputs (e.g., V3/V4) can be tied to higher adjacent supply rails - simplifies design for <6-rail systems |
| Thermal-enhanced DFN | Exposed pad improves thermal resistance (θJA = 76°C/W) - sustains full performance in compact enclosures |
Applications
| Network Server Power Sequencing | Optical Transceiver Module Monitoring |
|---|---|
Use Scenario: Simultaneous monitoring of 3.3V, 2.5V, 1.8V, and 1.5V rails powering FPGA I/O banks, SerDes PHYs, and analog front-ends in 1RU server blades. IC Role / Device Role / Timing Role: Six-input supervisor enforcing strict power-good sequence before releasing processor reset; 200ms timeout prevents premature boot during rail settling. Use Value: ±1.5% threshold accuracy eliminates need for derating system margins beyond PSU tolerance, reducing risk of undetected brownout failures. |
Use Scenario: Real-time supervision of dual 3.3V supplies (laser driver + digital control) and three lower-voltage rails (1.8V/1.5V/1.2V) in SFP+ modules operating at –5°C to +70°C ambient. IC Role / Device Role / Timing Role: Compact DFN-packaged supervisor providing fail-safe reset assertion during laser diode overcurrent events or TEC controller faults. Use Value: Ultralow 0.5V VCC operation ensures RST remains asserted even as backup LDOs sag during AC mains interruption. |
| Wireless Base Station RF Front-End | Industrial Multivoltage PLC Controller |
Use Scenario: Monitoring 3.3V (FPGA core), 2.5V (ADC/DAC), 1.8V (RF synthesizer), and 1.5V (memory interface) in LTE macrocell remote radio units exposed to wide temperature swings. IC Role / Device Role / Timing Role: High-accuracy supervisor detecting undervoltage on any rail and holding RST low until all four rails stabilize for ≥200ms post-power-up. Use Value: Glitch immunity prevents spurious resets caused by RF coupling onto power rails, avoiding service interruption during transmission bursts. |
Use Scenario: Supervising isolated 24V DC-DC outputs (3.3V, 2.5V, 1.8V, 1.5V) and two field-programmable thresholds (e.g., 12V sensor supply, 5V I/O) in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Dual-adjustable-input capability enables custom trip points for non-standard industrial rails without adding external comparators. Use Value: Adjustable inputs reduce BOM count by replacing discrete resistor-divider + comparator solutions for auxiliary rail monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT29D3+T | Single 2.93V reset IC in SOT23-3; no multi-input capability or adjustable thresholds | Only suitable for single-rail monitoring; cannot replace six-input function of LTC2908IDDB-B1#TRPBF | Select only when supervising one critical rail where space and cost outweigh multi-rail visibility needs |
| TPS3808G33DBVR | Single 3.3V supervisor with 200ms delay; 6-pin SOT23; lacks adjustable inputs and multi-rail integration | Requires four separate ICs to match LTC2908IDDB-B1#TRPBF's six-input coverage - increases layout complexity and BOM count | Choose for simple 3.3V-only systems where footprint minimization is secondary to procurement simplicity |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2908IDDB-B1#TRPBF delivers integrated six-rail visibility, adjustable thresholds, and guaranteed 0.5V operation - making it uniquely suited for space-constrained multivoltage systems where coordinated reset timing and brownout resilience are mandatory.
Availability
LTC2908IDDB-B1#TRPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and wireless base stations requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2908IDDB-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2908 product line delivers precision, low-power, multirail voltage supervision for telecom and computing infrastructure - engineered to simplify power sequencing, improve system reliability, and eliminate external timing components in dense PCB layouts.
FAQ
What are the exact fixed input voltage thresholds for LTC2908IDDB-B1#TRPBF?
The LTC2908IDDB-B1#TRPBF is configured for 3.3V (V1), 2.5V (V2), 1.8V (V3), and 1.5V (V4) fixed thresholds, with guaranteed ±1.5% accuracy over –40°C to +85°C. Measured thresholds are 3.036V–3.135V (V1), 2.300V–2.375V (V2), 1.656V–1.720V (V3), and 1.380V–1.425V (V4). These values are factory-trimmed and do not require external calibration.
How does the LTC2908IDDB-B1#TRPBF handle power-down sequencing?
During power-down, the LTC2908IDDB-B1#TRPBF asserts RST low as soon as any monitored input drops below its threshold. Crucially, it maintains a valid logic-low state (≤0.15V) on RST even when internal VCC decays to 0.5V - ensuring downstream logic remains held in reset until all rails fully collapse, preventing metastability in FPGAs or processors.
Can unused inputs on LTC2908IDDB-B1#TRPBF be left floating?
No - unused inputs on LTC2908IDDB-B1#TRPBF must not be left floating. Per datasheet guidance, they should be tied to the nearest higher available supply voltage (e.g., connect unneeded VADJ2 to 3.3V) to prevent noise coupling and undefined comparator states. Floating inputs risk false resets or increased quiescent current.
What is the maximum supply voltage allowed on V1 and V2 pins of LTC2908IDDB-B1#TRPBF?
The absolute maximum rating for V1 and V2 pins on LTC2908IDDB-B1#TRPBF is 7V, but recommended operating voltage is ≤6V per the Absolute Maximum Ratings table. Exceeding 6V risks long-term reliability degradation, especially at elevated temperatures. For 12V rail monitoring, use an external resistor divider into VADJ1/VADJ2 instead.
Does LTC2908IDDB-B1#TRPBF require external capacitors for stable operation?
Yes - LTC2908IDDB-B1#TRPBF requires 0.1μF ceramic bypass capacitors on both V1 and V2 pins (the VCC sources), placed as close as possible to the device. While V3, V4, and VADJ pins tolerate floating conditions, adding 0.1μF caps there improves noise immunity in electrically noisy environments like switch-mode power supply zones.
LTC2908IDDB-B1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 6
- Voltage - Threshold:
- 1.403V, 1.683V, 2.338V, 3.086V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2908IDDB-B1#TRPBF FAQ
1.How can I place an order for LTC2908IDDB-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2908IDDB-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 LTC2908IDDB-B1#TRPBF reliable?
The price and inventory of LTC2908IDDB-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 LTC2908IDDB-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2908IDDB-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2908IDDB-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2908IDDB-B1#TRPBF?
LTC2908IDDB-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2908IDDB-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 LTC2908IDDB-B1#TRPBF?
For technical support, including LTC2908IDDB-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2908IDDB-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2908IDDB-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2908IDDB-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 LTC2908IDDB-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2908IDDB-B1#TRPBF?
All LTC2908IDDB-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2908IDDB-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 LTC2908IDDB-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2908IDDB-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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