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Analog Devices Inc. LTC2904CDDB#TRPBF
- Part No.:
- LTC2904CDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2904CDDB#TRPBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
LTC2904CDDB#TRPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with pin-selectable thresholds, designed for systems requiring simultaneous monitoring of two independent voltage rails. It features ±1.5% threshold accuracy over 0°C to 70°C, fixed 200ms reset timeout, open-drain RST output, and guaranteed operation down to 1V input. It is used in desktop computers, network servers, and embedded logic power sequencing.
For engineers reviewing the LTC2904CDDB#TRPBF datasheet, LTC2904CDDB#TRPBF pinout, LTC2904CDDB#TRPBF application, or LTC2904CDDB#TRPBF equivalent, key selection criteria include its DFN-8 package, programmable 5%/7.5%/10% tolerance, nine V1/V2 threshold combinations (e.g., 5V/3.3V, 3.3V/2.5V), glitch immunity, and internal VCC auto-select from the higher of V1 or V2.
Technical Context
The LTC2904CDDB#TRPBF implements dual independent comparators with a shared reset pulse generator and three-state programming interface (S1, S2, TOL). Its bandgap reference and resistor network deliver tight ±1.5% threshold accuracy across temperature without external components.
It uses internal power detect and first-order low-pass filtering at comparator outputs to suppress noise-induced false resets, combined with a fixed 200ms delay timer that only triggers after both monitored supplies remain above threshold for the full duration - ensuring robust brownout recovery and power-up sequencing integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Threshold Accuracy | ±1.5% over full operating temperature range - enables reliable detection within tight margins without calibration. |
| Reset Timeout Period | 140–260 ms (typ. 200 ms) - ensures sufficient hold time for microprocessor initialization before release. |
| Input Voltage Range (V1/V2) | –0.3 V to 7 V - supports monitoring of 1.0 V to 5.0 V rails with headroom for transients. |
| RST Output Type | Open-drain with weak internal pull-up to VCC - allows wired-OR reset bus and compatibility with varied logic families. |
| Minimum Valid VCC | 1 V - guarantees correct RST state during low-voltage brownout, enabling fail-safe system behavior. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade computing and industrial control applications. |
| Package | 8-lead (3 mm × 2 mm) Plastic DFN with exposed pad - provides thermal performance and space efficiency for dense PCB layouts. |
Pinout & Package
Package: 8-lead plastic DFN (3 mm × 2 mm), exposed pad (Pin 9) soldered to PCB for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 (Pin 1) | Voltage Input 2 | Monitors second rail (selectable 1.0 V–3.3 V); also contributes to internal VCC generation. |
| RST (Pin 2) | Reset Logic Output | Active-low open-drain output; asserts low when either V1 or V2 falls below threshold for ≥200 ms. |
| RST (Pin 3) | Inverted Reset Output | Complementary to Pin 2; pulls low only when both supplies are valid - used for active-high reset logic. |
| GND (Pin 4) | Ground Reference | Primary ground connection; exposed pad (Pin 9) must be soldered to PCB ground plane. |
| TOL (Pin 5) | Tolerance Select Input | Three-state pin (V1/Open/GND) sets common tolerance: 5%/7.5%/10% for both V1 and V2. |
| S1 (Pin 6) | Voltage Threshold Select 1 | Three-state pin defining V1/V2 combination per Table 1 (e.g., V1 = 5 V, V2 = 3.3 V). |
| S2 (Pin 7) | Voltage Threshold Select 2 | Second three-state pin completing V1/V2 pair selection; works jointly with S1 and TOL. |
| V1 (Pin 8) | Voltage Input 1 | Monitors primary rail (selectable 2.5 V–5.0 V); determines VCC if ≥ V2. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable thresholds | 27 combinations (9 V1/V2 pairs × 3 tolerances) eliminate BOM proliferation across voltage variants. |
| Glitch-immune comparator design | First-order low-pass filtering + 200 ms timing window prevents false resets from sub-5 kHz supply noise. |
| Internal VCC auto-select | Derives supply from higher of V1 or V2 - eliminates need for dedicated bias rail and simplifies layout. |
| Guaranteed RST operation down to 1 V | Ensures deterministic reset assertion during deep brownout, critical for data retention and safe shutdown. |
| Low quiescent current | Typical 65 μA V1 input current and 0.4 μA V2 input current minimize loading on sensitive power rails. |
Applications
| Desktop & Notebook Computers | Network Servers |
|---|---|
Use Scenario: Monitoring 5 V and 3.3 V rails powering CPU core logic and peripheral I/O in compact form-factor PCs. IC Role / Device Role / Timing Role: Dual-rail supervisor providing synchronized reset release after stable power-up, with 200 ms delay ensuring BIOS initialization completes. Use Value: Eliminates need for discrete resistors or external RC networks - reduces component count and improves long-term threshold stability vs. resistor-based supervisors. | Use Scenario: Coordinating power sequencing of 12 V, 5 V, and 3.3 V DC/DC converter outputs in multi-board server backplanes. IC Role / Device Role / Timing Role: Acts as centralized supply-good indicator with open-drain RST enabling wired-OR reset bus across multiple processor modules. Use Value: ±1.5% accuracy ensures consistent trip points across temperature - avoids premature resets during thermal cycling in high-density rack environments. |
| Core & I/O Power Monitoring | Handheld Devices |
Use Scenario: Supervising asymmetric rails such as 2.5 V core and 1.2 V I/O in FPGA or ASIC-based embedded systems. IC Role / Device Role / Timing Role: Provides independent undervoltage detection on each rail with shared reset output, simplifying reset logic integration. Use Value: Three-state programming pins allow field-configurable thresholds without changing hardware - accelerates validation across multiple board revisions. | Use Scenario: Ensuring clean boot of ARM-based application processors powered by 3.3 V and 1.8 V LDOs in battery-powered tablets. IC Role / Device Role / Timing Role: Monitors both rails simultaneously and asserts reset if either drops below programmed threshold for >200 ms during battery sag. Use Value: DFN-8 package (3 mm × 2 mm) saves PCB area versus SOIC alternatives - critical for space-constrained mobile designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V/3.3 V dual monitor; no pin-selectable thresholds; 200 ms fixed delay; SOT-23-6 package. | Only supports identical voltage pairs; lacks V1/V2 flexibility and tolerance programming. | Select when monitoring two equal rails and board space permits smaller 6-pin package. |
| MAX6816EUT+T | Single 3.3 V supply monitor with watchdog; no dual-input capability; 5-pin SOT-23; no programmable tolerance. | Cannot replace dual-rail function - requires two devices for same coverage, increasing cost and footprint. | Use only for single-rail margining where watchdog functionality is required alongside reset. |
Compared with LTC2904CDDB#TRPBF, TPS3808G33DBVR offers smaller size but sacrifices voltage pair flexibility and programmability, while MAX6816EUT+T lacks dual-monitoring capability entirely - making LTC2904CDDB#TRPBF uniquely suited for space-constrained, multi-rail systems needing configurable thresholds.
Availability
LTC2904CDDB#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and handheld devices requiring stable component supply with guaranteed commercial-temperature operation and long-term production support.
Supply support for LTC2904CDDB#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 and maintains its high-precision analog and power management product lines with rigorous qualification standards.
The LTC2904 belongs to Linear's precision power supervision family, engineered for systems demanding accurate, noise-immune voltage monitoring without external passive components - targeting computing, communications, and industrial control applications.
FAQ
What is the operating temperature range for LTC2904CDDB#TRPBF?
The LTC2904CDDB#TRPBF is rated for 0°C to 70°C ambient operation, meeting commercial-grade specifications. This range is confirmed in the "ORDER INFORMATION" table of the datasheet, where "C" grade denotes the 0°C to 70°C temperature range, and the DDB package variant LTC2904CDDB#TRPBF explicitly carries this grade designation.
Does LTC2904CDDB#TRPBF support adjustable reset timeout?
No, LTC2904CDDB#TRPBF has a fixed 200 ms reset timeout period. Adjustable timing is exclusive to the LTC2905 family (e.g., LTC2905CDDB#TRPBF), which uses an external capacitor on the TMR pin. The LTC2904CDDB#TRPBF datasheet specifies tRST = 140–260 ms (typ. 200 ms) with no provision for external timing components.
How many voltage threshold combinations does LTC2904CDDB#TRPBF support?
The LTC2904CDDB#TRPBF supports nine distinct V1/V2 voltage combinations via S1 and S2 three-state inputs - including 5.0 V/3.3 V, 3.3 V/2.5 V, 3.3 V/1.8 V, and others listed in Table 1. Combined with three tolerance options (5%, 7.5%, 10%) set by the TOL pin, it delivers 27 total configuration states without external components.
What is the minimum input voltage required for LTC2904CDDB#TRPBF to guarantee correct RST output state?
The LTC2904CDDB#TRPBF guarantees correct RST logic state for inputs down to 1 V, as specified in the "FEATURES" section and confirmed in Absolute Maximum Ratings. This ensures reliable reset assertion during brownout conditions where either V1 or V2 remains ≥1 V, enabling fail-safe system behavior.
Is an external pull-up resistor required for the RST pin of LTC2904CDDB#TRPBF?
An external pull-up resistor is not required but may be used to improve rise time or VOH level. The LTC2904CDDB#TRPBF includes a weak internal pull-up to VCC (≈6 μA), sufficient for non-critical timing. However, for faster transitions or VOH > VCC, a 10 kΩ external pull-up is recommended - as noted in the Applications Information section under "Output Rise and Fall Time Estimation".
LTC2904CDDB#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:
- 2
- Voltage - Threshold:
- 9 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2904CDDB#TRPBF FAQ
1.How can I place an order for LTC2904CDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2904CDDB#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 LTC2904CDDB#TRPBF reliable?
The price and inventory of LTC2904CDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2904CDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2904CDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2904CDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2904CDDB#TRPBF?
LTC2904CDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2904CDDB#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 LTC2904CDDB#TRPBF?
For technical support, including LTC2904CDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2904CDDB#TRPBF requirements.
6.How does Aetrix verify that LTC2904CDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2904CDDB#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 LTC2904CDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2904CDDB#TRPBF?
All LTC2904CDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2904CDDB#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 LTC2904CDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC2904CDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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