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Analog Devices Inc. LTC2908CDDB-B1#TRMPBF
- Part No.:
- LTC2908CDDB-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2908CDDB-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 6 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,455
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Product details
Overview
LTC2908CDDB-B1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply monitor IC designed for multivoltage systems requiring tight threshold accuracy and ultralow-voltage reset assertion. It monitors 3.3V, 2.5V, 1.8V, 1.5V, and two adjustable inputs (VADJ1/VADJ2) with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST pull-down operation down to VCC = 0.5V. It is used in network servers and optical networking systems for reliable power-on reset and brownout detection.
For engineers reviewing the LTC2908CDDB-B1#TRMPBF datasheet, LTC2908CDDB-B1#TRMPBF pinout, LTC2908CDDB-B1#TRMPBF application, or LTC2908CDDB-B1#TRMPBF equivalent, key selection criteria include its fixed 3.3V/2.5V/1.8V/1.5V monitoring thresholds, dual adjustable inputs, open-drain RST output with 0.15V low-level guarantee at 0.5V VCC, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2908CDDB-B1#TRMPBF implements six independent comparators referenced to a bandgap voltage, each with built-in glitch immunity via first-order low-pass filtering on comparator outputs. Its internal reset pulse generator enforces a 200ms delay after all inputs exceed their thresholds before releasing RST.
VCC is auto-selected as the greater of V1 or V2, enabling self-powering from monitored rails; the RST output features a weak internal 6μA pull-up to VCC and a strong active-low pull-down capable of sinking ≥2.5mA at VCC = 3.0V while maintaining VOL ≤ 0.15V at VCC = 0.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Count | 6 simultaneous voltage inputs: V1 (3.3V), V2 (2.5V), V3 (1.8V), V4 (1.5V), VADJ1, VADJ2 |
| Threshold Accuracy | ±1.5% over full operating temperature range (0°C to 70°C), enabling tighter system voltage margin design |
| Reset Timeout | 200ms nominal delay ensures immunity to supply noise above 5Hz without external capacitor |
| RST Output Type | Active-low open-drain with guaranteed VOL ≤ 0.15V at VCC = 0.5V, supporting wired-OR reset bus architectures |
| Supply Range (VCC) | 0.5V to 6V - operates reliably during deep brownout when only one monitored rail remains partially active |
| Package | 8-lead (3mm × 2mm) plastic DFN with exposed pad; footprint compatible with automated SMT assembly |
| Quiescent Current | Typical 24μA from V1 (at 3.3V), enabling use in always-on power domains without significant leakage impact |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), 0.5mm pitch, exposed thermal pad (Pin 9, optional GND connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 4) | Ground Reference | Primary return path for internal circuitry and RST pull-down; must be low-impedance connection |
| RST (Pin 3) | Reset Output | Open-drain logic output; asserts low when any input falls below threshold and holds low for 200ms after recovery |
| V4 (Pin 2) | Fixed Input 4 | Monitors 1.5V supply with 1.380V–1.425V threshold; tied to higher rail if unused |
| V2 (Pin 1) | Fixed Input 2 / VCC Source | Monitors 2.5V supply (2.300V–2.375V threshold); supplies internal VCC when > V1 |
| VADJ2 (Pin 5) | Adjustable Input 2 | Comparator input with 0.492V–0.508V threshold; connects to resistor divider for custom trip points |
| V3 (Pin 6) | Fixed Input 3 | Monitors 1.8V supply (1.656V–1.720V threshold); tied to higher rail if unused |
| VADJ1 (Pin 7) | Adjustable Input 1 | Comparator input with 0.492V–0.508V threshold; enables monitoring of non-standard rails (e.g., 1.0V, 0.9V) |
| V1 (Pin 8) | Fixed Input 1 / Primary VCC Source | Monitors 3.3V supply (3.036V–3.135V threshold); supplies internal VCC when ≥ V2 |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-Voltage Reset Assertion | Guaranteed RST pull-down to ≤0.15V with VCC as low as 0.5V - prevents floating reset line during deep brownout |
| Glitch-Immune Monitoring | Integrated comparator output filtering + 200ms timeout eliminates false resets from sub-5Hz supply transients |
| Auto-Selected Internal Supply | VCC dynamically sourced from greater of V1 or V2 - eliminates need for dedicated bias rail |
| Space-Efficient DFN Packaging | 3mm × 2mm footprint with 0.5mm pitch supports high-density server and telecom board layouts |
| Dual Adjustable Inputs | VADJ1/VADJ2 accept resistor-divided rails down to 0.6V, extending monitoring coverage beyond fixed thresholds |
Applications
| Network Server Power Sequencing | Optical Networking Line Card Supervision |
|---|---|
Use Scenario: Monitors 12V, 3.3V, 2.5V, 1.8V, 1.5V, and FPGA core voltage on a multi-rail server motherboard during cold start and hot-swap events. IC Role / Device Role / Timing Role: Six-input supply monitor providing synchronized reset release only after all rails stabilize for ≥200ms. Use Value: Prevents CPU/FPGA configuration errors by ensuring all power domains meet spec before release, leveraging ±1.5% threshold accuracy to minimize system voltage margin. | Use Scenario: Supervises isolated DC/DC outputs powering SERDES, laser drivers, and control logic on an OTN line card with strict power-up ordering. IC Role / Device Role / Timing Role: Fixed-threshold monitoring of 3.3V, 2.5V, 1.8V, 1.5V rails plus adjustable inputs for custom analog bias voltages. Use Value: Enables single-chip supervision of heterogeneous rails, reducing BOM count and PCB area versus discrete supervisor solutions. |
| Wireless Base Station RF Module | Desktop/Notebook Multivoltage Platform |
Use Scenario: Ensures clean power-up of PA bias, ADC/DAC reference, and digital control rails in a 5G massive MIMO radio unit. IC Role / Device Role / Timing Role: Simultaneous monitoring of 3.3V (digital), 2.5V (analog), 1.8V (interface), 1.5V (memory), and two adjustable rails for PA bias sequencing. Use Value: Ultralow-VCC RST operation guarantees reset integrity even during partial power loss in remote outdoor cabinets. | Use Scenario: Validates core, I/O, memory, and auxiliary rails on a laptop motherboard where space constraints limit discrete component count. IC Role / Device Role / Timing Role: Compact DFN-packaged monitor replacing multiple SOT-23 supervisors; VADJ inputs cover proprietary regulator outputs. Use Value: Reduces supervisor footprint by >60% versus dual-SOT-23 solution while maintaining identical timing and accuracy specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V input; no adjustable inputs; 200ms timeout; ±2.5% threshold accuracy | Only monitors one rail; lacks multirail coordination and adjustable capability | Select only when supervising a single 3.3V domain with relaxed accuracy requirements |
| MAX6816EUT+T | Quad 3.3V/2.5V/1.8V/1.5V inputs; no adjustable inputs; 200ms timeout; ±1.5% accuracy | Supports four fixed rails only; cannot monitor five or six rails simultaneously | Choose when system has ≤4 fixed rails and no need for custom voltage monitoring |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2908CDDB-B1#TRMPBF uniquely delivers six-input monitoring with dual adjustable thresholds and guaranteed 0.5V VCC operation - essential for complex multivoltage systems requiring coordinated reset across heterogeneous rails.
Availability
LTC2908CDDB-B1#TRMPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and wireless base stations requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial-grade deployments.
Supply support for LTC2908CDDB-B1#TRMPBF 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, serving industrial, automotive, communications, and healthcare markets.
The LTC2908 product line was developed by Linear Technology (acquired by ADI in 2017) to deliver precision, low-power, multirail supply monitoring in minimal footprint - specifically targeting high-reliability computing and telecom infrastructure.
FAQ
What is the operating temperature range for the LTC2908CDDB-B1#TRMPBF?
The LTC2908CDDB-B1#TRMPBF is specified for commercial temperature operation from 0°C to 70°C. This grade is validated for use in controlled-environment applications such as enterprise servers, desktop computers, and indoor telecom equipment where ambient temperatures remain within this range. The 'C' suffix in the part number explicitly denotes the 0°C to 70°C rating.
Which voltage rails does the LTC2908CDDB-B1#TRMPBF monitor by default?
The LTC2908CDDB-B1#TRMPBF monitors 3.3V (V1), 2.5V (V2), 1.8V (V3), and 1.5V (V4) with factory-trimmed thresholds, plus two adjustable inputs (VADJ1 and VADJ2) set to trigger at 0.5V. This configuration is distinct from the A1 (5V/3.3V/2.5V/1.8V) and C1 (2.5V + five adjustable) variants, making LTC2908CDDB-B1#TRMPBF optimal for modern low-voltage multirail systems.
Can the LTC2908CDDB-B1#TRMPBF operate with only one powered input?
Yes - the LTC2908CDDB-B1#TRMPBF can operate with only V1 or V2 powered, as the greater of these two pins serves as the internal VCC. When V1 = 3.3V and V2 = GND, the device draws ~24μA from V1 and asserts RST low until all enabled inputs exceed their thresholds. This single-rail operability enables flexible integration into partial-power designs.
How is the reset timeout period determined for the LTC2908CDDB-B1#TRMPBF?
The reset timeout period for the LTC2908CDDB-B1#TRMPBF is fixed at 200ms (160ms to 260ms over temperature) and generated by an internal capacitor-based timer - no external components are required. This timeout begins only after all six inputs exceed their respective thresholds and ensures immunity to supply noise above 5Hz, eliminating the need for external timing elements.
What is the minimum VCC required to guarantee correct RST logic state in the LTC2908CDDB-B1#TRMPBF?
The LTC2908CDDB-B1#TRMPBF guarantees correct RST logic state (low when asserted, high-impedance otherwise) as long as V1 and/or V2 is ≥0.5V. At VCC = 0.5V, RST is guaranteed to pull low to ≤0.15V, enabling reliable reset assertion during deep brownout conditions where other supervisors fail.
LTC2908CDDB-B1#TRMPBF 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2908CDDB-B1#TRMPBF FAQ
1.How can I place an order for LTC2908CDDB-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2908CDDB-B1#TRMPBF 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 LTC2908CDDB-B1#TRMPBF reliable?
The price and inventory of LTC2908CDDB-B1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2908CDDB-B1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2908CDDB-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2908CDDB-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2908CDDB-B1#TRMPBF?
LTC2908CDDB-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2908CDDB-B1#TRMPBF 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 LTC2908CDDB-B1#TRMPBF?
For technical support, including LTC2908CDDB-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2908CDDB-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2908CDDB-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2908CDDB-B1#TRMPBF 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 LTC2908CDDB-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2908CDDB-B1#TRMPBF?
All LTC2908CDDB-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2908CDDB-B1#TRMPBF, 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 LTC2908CDDB-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2908CDDB-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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