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Analog Devices Inc. LTC2908ITS8-C1#TRPBF
- Part No.:
- LTC2908ITS8-C1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2908ITS8-C1#TRPBF.pdf
- Description:
- IC SUPERVISOR 6 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2908ITS8-C1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply monitor IC designed for multivoltage systems requiring accurate, compact, and ultralow-voltage reset supervision. It monitors V1 plus five adjustable inputs (VADJ1–VADJ5) with ±1.5% threshold accuracy over temperature, guarantees RST assertion down to 0.5V VCC, and delivers a 200ms reset timeout. It is used in optical networking systems and multivoltage server power rails.
For engineers reviewing the LTC2908ITS8-C1#TRPBF datasheet, LTC2908ITS8-C1#TRPBF pinout, LTC2908ITS8-C1#TRPBF application, or LTC2908ITS8-C1#TRPBF equivalent, key selection criteria include its 2.5V nominal internal supply, 0.5V adjustable input threshold, open-drain RST output with guaranteed low-state operation at 0.5V, 8-lead TSOT-23 package, and –40°C to 85°C industrial temperature range.
Technical Context
The LTC2908ITS8-C1#TRPBF implements six independent voltage comparators referenced to a bandgap-derived 0.5V internal threshold, with all five adjustable inputs (VADJ1–VADJ5) tied to the same 0.5V reference. Its internal VCC is sourced solely from V1, eliminating dependency on V2-unlike A1/B1 variants-and enabling deterministic low-voltage operation during brownout.
Reset logic asserts RST low when any input falls below its threshold and holds it low for ≥200ms after all inputs return above threshold. Glitch immunity is achieved via integrated comparator filtering and a dedicated 200ms timer, ensuring robustness against supply transients without hysteresis-induced threshold error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Count | Six monitored inputs: V1 + VADJ1 through VADJ5 - no fixed-voltage inputs; all adjustable via external resistor dividers. |
| Threshold Accuracy | ±1.5% over full –40°C to 85°C range - enables tight system voltage margining without additional hysteresis error. |
| RST Timeout | 200ms nominal delay after all inputs stabilize - eliminates false resets from short-duration supply noise (<5Hz). |
| VCC Source | V1 only - removes V2 dependency, simplifies biasing, and ensures predictable ultralow-voltage operation down to 0.5V. |
| RST Output Type | Active-low open-drain - supports wired-OR of multiple supervisors and external pull-up to any rail up to 7V. |
| Supply Range | V1 = 0.5V to 6V - guarantees correct RST logic state even during deep brownout, critical for fail-safe system shutdown. |
| Input Bias Current | VADJx ≤ ±15nA - minimizes divider current error, enabling high-resistance (e.g., 100kΩ) resistor networks for low-power monitoring. |
Pinout & Package
Package: 8-lead plastic TSOT-23 (ThinSOT™), 3mm × 1.75mm footprint, 1mm profile, lead-free finish. Exposed pad not present in TSOT-23 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Voltage Input 1 / Internal VCC Source | Sole internal supply rail; must be ≥0.5V for RST functionality; draws ~22μA; requires 0.1μF bypass to GND. |
| VADJ5 | Adjustable Voltage Input 5 | High-impedance comparator input referenced to 0.5V; connects to resistor divider tap for custom trip point. |
| RST | Reset Logic Output | Open-drain output; pulls low when any input < threshold; weak internal pull-up to V1; supports external pull-up to higher voltage. |
| GND | Device Ground | Reference node for all inputs and RST; must be low-impedance connection to system ground plane. |
| VADJ4 | Adjustable Voltage Input 4 | Identical function to VADJ5; independent 0.5V-referenced comparator for sixth monitored rail. |
| VADJ3 | Adjustable Voltage Input 3 | Third adjustable input; enables monitoring of three distinct DC/DC outputs using single IC. |
| VADJ2 | Adjustable Voltage Input 2 | Second adjustable input; supports flexible configuration across diverse supply voltages (e.g., 1.2V, 1.8V, 2.5V). |
| VADJ1 | Adjustable Voltage Input 1 | First adjustable input; primary interface for setting first custom threshold; compatible with standard 1% resistor values. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-Voltage Reset Operation | Guaranteed RST low-state operation with V1 ≥ 0.5V - ensures reliable system reset initiation during severe brownout conditions. |
| Five Independent Adjustable Inputs | VADJ1–VADJ5 each compare to 0.5V reference - eliminates need for multiple fixed-threshold supervisors in heterogeneous multivoltage systems. |
| No External Timing Components | 200ms reset timeout generated internally - reduces BOM count, PCB area, and design validation effort versus capacitor-timed alternatives. |
| Glitch-Immune Comparator Architecture | Integrated low-pass filtering + 200ms timer - rejects transients <250μs and supply noise >5Hz without sacrificing ±1.5% threshold accuracy. |
| Low Quiescent Current | ~22μA total supply current from V1 - enables use in always-on power domains without significant battery drain or thermal impact. |
Applications
| Optical Networking Systems | Multivoltage Server Power Rails |
|---|---|
Use Scenario: Monitoring bias supplies for laser diode drivers and transimpedance amplifiers in 100G coherent modules. IC Role / Device Role / Timing Role: Six-input supervisor ensures synchronized reset across analog front-end, DSP core, and SerDes power domains during cold start or fault recovery. Use Value: ±1.5% threshold accuracy prevents premature reset during marginal 3.3V/2.5V/1.8V rail settling, improving link-up reliability. | Use Scenario: Supervising auxiliary 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V rails alongside main 12V input in dual-processor rack servers. IC Role / Device Role / Timing Role: Single LTC2908ITS8-C1#TRPBF replaces five discrete supervisors, reducing component count while maintaining per-rail adjustability. Use Value: VADJ1–VADJ5 inputs support precise trip points for modern low-voltage ASICs, avoiding over-margining required by fixed-threshold parts. |
| Industrial Edge AI Accelerators | Programmable Logic Power Sequencing |
Use Scenario: Ensuring clean power-up sequencing for FPGA fabric, memory interfaces, and AI inference cores operating at 0.85V–1.2V. IC Role / Device Role / Timing Role: Monitors five distributed low-voltage rails derived from multiphase buck converters; RST enables FPGA configuration lock until all rails are stable. Use Value: 200ms timeout aligns with FPGA configuration timing requirements, preventing partial bitstream load due to premature release. | Use Scenario: Coordinating power-up order of Xilinx Versal ACAP banks (VCCINT, VCCAUX, VCCO, etc.) where thresholds vary by ±3% across process corners. IC Role / Device Role / Timing Role: Configurable VADJ inputs allow exact match to vendor-specified minimum valid voltages, eliminating manual resistor tuning per board revision. Use Value: 0.5V reference + ±15nA input bias enables <0.1% divider error with standard 1% resistors, tightening sequencing window vs. legacy supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V threshold; only one input; no adjustable inputs; 200ms timeout; 3-pin SOT-23. | Monitors single rail only; cannot replace six-input function without cascading or additional ICs. | Select only if supervising exactly one 3.3V rail with identical timeout and industrial temp range. |
| MAX6816EUT+T | Single-channel, 0.5V adjustable threshold; 140ms timeout; 5-pin SOT-23; ±2% accuracy over –40°C to 105°C. | Lacks multi-input capability; requires five units to match LTC2908ITS8-C1#TRPBF's six-input coverage. | Consider only for space-constrained single-rail designs where extended temperature range outweighs integration loss. |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2908ITS8-C1#TRPBF uniquely integrates six independently adjustable inputs in one TSOT-23 package with ±1.5% accuracy and guaranteed 0.5V operation-enabling true multirail supervision without compromise on precision, voltage range, or board area.
Availability
LTC2908ITS8-C1#TRPBF is available at Aetrix Electronics and suitable for optical networking systems, multivoltage server power rails, and industrial edge AI accelerators requiring stable component supply across long production lifecycles.
Supply support for LTC2908ITS8-C1#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2908 series is part of Linear's precision power supervision product line, engineered for high-accuracy, low-power, multivoltage monitoring in telecom infrastructure, enterprise computing, and industrial control systems.
FAQ
What is the internal supply voltage source for LTC2908ITS8-C1#TRPBF?
The LTC2908ITS8-C1#TRPBF derives its internal supply voltage (VCC) exclusively from the V1 pin-unlike A1/B1 variants that select between V1 and V2. This design ensures deterministic behavior during brownout, as V1 ≥ 0.5V guarantees correct RST logic state. The datasheet specifies V1 must remain within 0.5V to 6V for full functionality, and a 0.1μF ceramic bypass capacitor is required on V1 to GND.
Can LTC2908ITS8-C1#TRPBF monitor a 1.2V supply rail?
Yes, the LTC2908ITS8-C1#TRPBF can monitor a 1.2V rail using any of its five adjustable inputs (VADJ1–VADJ5). By connecting the rail to a resistor divider with R2 = 100kΩ and R1 = 124kΩ (1% value), the trip point is set to 1.12V-within 7% of nominal and fully compatible with the ±1.5% threshold accuracy spec. The 0.5V internal reference and ±15nA input bias enable precise, low-power adjustment without external op-amps.
What is the reset timeout duration for LTC2908ITS8-C1#TRPBF and how is it implemented?
The LTC2908ITS8-C1#TRPBF features a nominal 200ms reset timeout period, guaranteed between 160ms and 260ms over temperature. This delay is generated by an internal capacitor-based timer-no external components required. The timer starts only after all six inputs (V1 + VADJ1–VADJ5) rise above their respective thresholds and remains active until completion, unless interrupted by any input falling below threshold, which resets the counter.
Does LTC2908ITS8-C1#TRPBF support wired-OR reset connections with other supervisors?
Yes, the LTC2908ITS8-C1#TRPBF supports wired-OR reset connections via its open-drain RST output. Multiple LTC2908ITS8-C1#TRPBF devices-or other open-drain reset ICs-can share a common RST net with a single external pull-up resistor. The RST line goes low if any device asserts reset, enabling hierarchical or redundant supervision schemes without logic gates or level shifters.
What is the maximum input voltage allowed on VADJ pins of LTC2908ITS8-C1#TRPBF?
The absolute maximum voltage on each VADJ pin (VADJ1–VADJ5) of the LTC2908ITS8-C1#TRPBF is (VCC + 0.6V), where VCC equals V1. Since V1 is rated up to 6V, the maximum allowable VADJ voltage is 6.6V. However, for reliable comparator operation, input voltage must remain within the 0V to VCC range. Exceeding VCC risks forward-biasing internal ESD protection diodes and degrading threshold accuracy or long-term reliability.
LTC2908ITS8-C1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 6
- Voltage - Threshold:
- 2.338V, Adj, Adj, Adj, 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:
- TSOT-23-8
LTC2908ITS8-C1#TRPBF FAQ
1.How can I place an order for LTC2908ITS8-C1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2908ITS8-C1#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 LTC2908ITS8-C1#TRPBF reliable?
The price and inventory of LTC2908ITS8-C1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2908ITS8-C1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2908ITS8-C1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2908ITS8-C1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2908ITS8-C1#TRPBF?
LTC2908ITS8-C1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2908ITS8-C1#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 LTC2908ITS8-C1#TRPBF?
For technical support, including LTC2908ITS8-C1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2908ITS8-C1#TRPBF requirements.
6.How does Aetrix verify that LTC2908ITS8-C1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2908ITS8-C1#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 LTC2908ITS8-C1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2908ITS8-C1#TRPBF?
All LTC2908ITS8-C1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2908ITS8-C1#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 LTC2908ITS8-C1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2908ITS8-C1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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