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Analog Devices Inc. LTC2903IS6-C1#TRMPBF
- Part No.:
- LTC2903IS6-C1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903IS6-C1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,399
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Product details
Overview
LTC2903IS6-C1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in a 6-lead TSOT-23 package, designed to supervise four independent voltage rails-5V, 3.3V, 1.8V, and –5.2V-with ±1.5% threshold accuracy over temperature. It features an active-low open-drain RST output with guaranteed low-voltage pull-down down to VCC = 0.5V, 200ms reset timeout, and ultralow 20µA quiescent current. It is used in multivoltage systems such as optical networking equipment and cell phone base stations.
For engineers reviewing the LTC2903IS6-C1#TRMPBF datasheet, LTC2903IS6-C1#TRMPBF pinout, LTC2903IS6-C1#TRMPBF application, or LTC2903IS6-C1#TRMPBF equivalent, key selection criteria include its –5.2V monitoring capability, guaranteed 0.5V VCC operation, 10% undervoltage threshold tolerance, SOT-23 footprint compatibility, and reset glitch immunity in noisy power-up/brownout conditions.
Technical Context
The LTC2903IS6-C1#TRMPBF implements four independent comparators referenced to a bandgap-derived 0.5V internal reference, each scaled for its designated rail (5V/3.3V/1.8V/–5.2V). Its reset logic holds RST low until all inputs exceed their thresholds for a continuous 200ms window, with no hysteresis applied to preserve ±1.5% accuracy.
VCC is autonomously generated from the higher of V1 or V2 (5V and 3.3V inputs), enabling operation without an external bias supply. The RST output includes a weak internal pull-up to V2 (10µA typical), and its pulldown strength derives from V1, V2, and V3-ensuring reliable low-state assertion even during sub-1V supply collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitored Voltages | 5V, 3.3V, 1.8V, –5.2V - fixed thresholds per input; enables supervision of mixed positive/negative rails in single-chip solution |
| Threshold Accuracy | ±1.5% over temperature - ensures deterministic reset timing across industrial range (–40°C to +85°C) |
| Reset Timeout | 200ms nominal (140–260ms min/max) - provides robust debouncing against transient supply dips |
| Supply Current | 20µA typical - minimizes loading on monitored supplies, critical for battery-backed or low-power systems |
| VCC Operating Range | 0.5V guaranteed - allows RST to remain asserted during deep brownout, preventing premature release |
| RST Output Type | Active-low open-drain - supports wired-OR reset buses and flexible external pull-up to any logic rail |
| Input Voltage Range (V4) | –6.5V to 0.3V - specifically rated for negative rail monitoring, unlike general-purpose supervisors |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Pin 1 marked with dot; pin 1–6 arranged linearly with GND at pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Main positive supply input | 5V rail input; primary source for internal VCC generation when ≥ V2; bypass required with 0.1µF capacitor |
| GND (Pin 2) | Reference ground | System ground return for all comparators and internal circuitry; must be low-impedance |
| V2 (Pin 3) | Secondary positive supply input | 3.3V rail input; assists VCC generation if > V1; bypass required with 0.1µF capacitor |
| V3 (Pin 4) | Third positive supply input | 1.8V rail input; contributes to low-voltage RST pulldown strength below 1V |
| V4 (Pin 5) | Negative supply input | –5.2V rail input; rated for –6.5V to 0.3V; enables direct negative rail supervision without level-shifting |
| RST (Pin 6) | Reset logic output | Open-drain active-low output; internal 10µA pull-up to V2; sinks ≥5µA at VOL ≤ 150mV with VCC = 0.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow VCC reset guarantee | Operates and asserts RST down to 0.5V VCC - prevents false release during severe brownout |
| No hysteresis design | Maintains ±1.5% threshold accuracy without degrading spec via intentional hysteresis - critical for tight-margin systems |
| Glitch-immune comparator response | Rejects transients <150µs unless overdrive exceeds 1% of threshold - eliminates noise-induced spurious resets |
| Triple-supply-assisted pulldown | V1+V2+V3 collectively strengthen RST sink capability below 1V - ensures solid low-state even with partial rail collapse |
| Auto-generated VCC | Derives internal supply from greater of V1/V2 - eliminates need for dedicated bias rail or LDO |
Applications
| Multivoltage Telecom Systems | Optical Networking Equipment |
|---|---|
Use Scenario: Supervising 5V control logic, 3.3V FPGA I/O, 1.8V core, and –5.2V analog bias in a line card. IC Role / Device Role / Timing Role: Quad-rail supervisor providing synchronized 200ms reset hold-off after power-up and brownout recovery. Use Value: Prevents partial initialization by ensuring all rails stabilize before releasing system reset, eliminating boot failures in dense backplane environments. | Use Scenario: Monitoring power rails in DWDM transponder modules where –5.2V supplies bias for EML lasers. IC Role / Device Role / Timing Role: Negative-rail-capable supervisor asserting RST until –5.2V reaches regulation, then holding for 200ms. Use Value: Direct –5.2V input rating avoids external level-shifting components, reducing BOM count and board area in space-constrained optics modules. |
| Cell Phone Base Station Power | Industrial Network Server PSU |
Use Scenario: Validating 5V management controller, 3.3V RF front-end, 1.8V DSP core, and –5.2V DAC reference in remote radio units. IC Role / Device Role / Timing Role: Precision quad monitor with guaranteed 0.5V VCC operation ensuring RST remains asserted during AC dropout events. Use Value: Enables fail-safe shutdown and controlled restart under grid instability, meeting 3GPP reliability requirements for outdoor deployments. | Use Scenario: Verifying redundant 5V/3.3V/1.8V outputs and auxiliary –5.2V rails in ATX-compatible server PSUs. IC Role / Device Role / Timing Role: Single-chip supervisor replacing discrete solutions, providing unified reset signaling to motherboard CPLD. Use Value: Reduces component count vs. dual-supervisor + level-shifter approach, improving long-term supply chain stability and thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2900CS6#TRMPBF | 16 selectable threshold combinations; no –5.2V option; ±1.5% accuracy; same 6-lead SOT-23 package | Requires external resistor configuration for each rail; cannot natively monitor negative voltages | Select when flexibility across multiple positive rails is needed and –5.2V supervision is unnecessary |
| LTC2902IS6#TRMPBF | Includes RST disable function; identical 5V/3.3V/1.8V/–5.2V thresholds and accuracy; same package and pinout | Supports software-controlled reset inhibition during firmware updates or diagnostics | Select when system-level reset override capability is required without adding external logic |
Compared with LTC2900CS6#TRMPBF, LTC2903IS6-C1#TRMPBF delivers native –5.2V monitoring without level-shifting, while LTC2902IS6#TRMPBF adds RST disable-making LTC2903IS6-C1#TRMPBF optimal for fixed-rail telecom applications demanding minimal BOM and proven negative-rail reliability.
Availability
LTC2903IS6-C1#TRMPBF is available at Aetrix Electronics and suitable for multivoltage telecom systems, optical networking equipment, and cell phone base station power requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature operation.
Supply support for LTC2903IS6-C1#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC2903 family.
The LTC2903 series was designed specifically for high-reliability multirail supervision in telecom infrastructure, where precise threshold accuracy, negative rail capability, and ultralow-VCC reset assurance are mandatory.
FAQ
What is the guaranteed minimum VCC voltage for reliable RST assertion in LTC2903IS6-C1#TRMPBF?
The LTC2903IS6-C1#TRMPBF guarantees RST assertion down to VCC = 0.5V, with VOL ≤ 150mV at 5µA sink current. This specification ensures the reset signal remains valid during severe brownout conditions where other supervisors would release prematurely. The LTC2903IS6-C1#TRMPBF achieves this via triple-supply-assisted pulldown using V1, V2, and V3 inputs.
Does LTC2903IS6-C1#TRMPBF support monitoring of negative supply rails?
Yes, LTC2903IS6-C1#TRMPBF explicitly supports –5.2V monitoring on V4 (Pin 5), with absolute maximum rating of –6.5V to 0.3V. Unlike most quad supervisors, it requires no external level-shifting circuitry for negative rail supervision. This capability is factory-configured and documented in the LTC2903-C1 variant datasheet section.
What is the reset timeout period for LTC2903IS6-C1#TRMPBF and how is it implemented?
The LTC2903IS6-C1#TRMPBF has a nominal reset timeout of 200ms, with guaranteed range of 140ms to 260ms over temperature. This delay is implemented via an internal digital timer that starts only after all four inputs exceed their thresholds and remains active as long as no input falls below threshold. The LTC2903IS6-C1#TRMPBF uses this timeout to debounce supply transients and prevent spurious resets.
How does LTC2903IS6-C1#TRMPBF generate its internal supply voltage (VCC)?
The LTC2903IS6-C1#TRMPBF generates VCC autonomously from the higher of the V1 (5V) or V2 (3.3V) inputs-no external bias supply is required. For the LTC2903IS6-C1#TRMPBF variant, VCC = max(V1, V2), and quiescent current is drawn from whichever input is supplying VCC. This architecture eliminates dependency on a dedicated VCC rail and simplifies system power design.
What is the threshold accuracy specification for LTC2903IS6-C1#TRMPBF over temperature?
LTC2903IS6-C1#TRMPBF guarantees ±1.5% threshold accuracy over the full industrial temperature range (–40°C to +85°C), referenced to each monitored voltage (e.g., ±1.5% of 5V = ±75mV). This accuracy is achieved without hysteresis, preserving precision for tight-margin systems. The LTC2903IS6-C1#TRMPBF datasheet confirms this spec applies to all four thresholds (5V, 3.3V, 1.8V, –5.2V) simultaneously.
LTC2903IS6-C1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 1.593V, 2.921V, 4.425V, -4.602V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC2903IS6-C1#TRMPBF FAQ
1.How can I place an order for LTC2903IS6-C1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903IS6-C1#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 LTC2903IS6-C1#TRMPBF reliable?
The price and inventory of LTC2903IS6-C1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2903IS6-C1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2903IS6-C1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903IS6-C1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903IS6-C1#TRMPBF?
LTC2903IS6-C1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903IS6-C1#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 LTC2903IS6-C1#TRMPBF?
For technical support, including LTC2903IS6-C1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903IS6-C1#TRMPBF requirements.
6.How does Aetrix verify that LTC2903IS6-C1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903IS6-C1#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 LTC2903IS6-C1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2903IS6-C1#TRMPBF?
All LTC2903IS6-C1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903IS6-C1#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 LTC2903IS6-C1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2903IS6-C1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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