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Analog Devices Inc. LTC2911ITS8-4
- Part No.:
- LTC2911ITS8-4
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911ITS8-4.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,629
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Product details
Overview
LTC2911ITS8-4 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator and latched reset functionality. It monitors 3.3V (V1), 1.2V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in embedded power management systems.
For engineers reviewing the LTC2911ITS8-4 datasheet, LTC2911ITS8-4 pinout, LTC2911ITS8-4 application, or LTC2911ITS8-4 equivalent, this page delivers verified specifications, validated TSOT-23-8 pin mapping, confirmed industrial-temperature operation, and two field-tested alternative parts for supply monitoring in server, automotive, and industrial control designs.
Technical Context
The LTC2911ITS8-4 implements three independent voltage comparators: V1 fixed at 3.086V (–6.5% of 3.3V), V2 fixed at 1.122V (–6.5% of 1.2V), and ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and integrated glitch filtering for noise immunity.
It integrates a power-fail comparator (PFI/PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus TMR-controlled latch mode for margin testing. Internal VCC generation selects the higher of V1 or V2 (V1 only for LTC2911-5 variants), enabling operation even when one supply is absent.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring across full industrial temperature range |
| V2 Threshold | 1.122V ±1.5% - precisely tracks 1.2V rail with no external resistor network required |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider |
| Reset Timeout | 200ms internal or 15–27ms external (CTMR = 2.2nF) - eliminates need for external timing capacitor in most applications |
| Supply Current | 30µA typical - enables low-power always-on supervision without impacting system efficiency |
| Min Operating VCC | 0.5V guaranteed - ensures valid RST/PFO logic states during brown-out and power-up ramping |
| PFI Hysteresis | 15mV (typical) - prevents chatter on noisy power-fail detection signals |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; triggers PFO low at 500mV falling edge |
| ADJ | Adjustable monitor input | Third comparator input with 500mV threshold; used with resistor divider for custom supply trip point |
| TMR | Reset timeout/latch control | Connect to V1 for 200ms internal timeout; pull to GND to latch RST state for margin testing |
| GND | Device ground reference | Common return path for all analog and digital circuitry; exposed pad (if present) must be connected to GND |
| V2 | 1.2V supply monitor input | Dedicated 1.2V rail monitor with factory-trimmed 1.122V threshold; bypass with ≥0.1µF capacitor |
| V1 | 3.3V supply monitor input & VCC source | Primary 3.3V monitor (3.086V threshold); supplies internal VCC and provides weak pull-up for RST/PFO |
| PFO | Power-fail logic output | Open-drain output asserting low on PFI undervoltage; provides early warning before main reset |
| RST | Reset logic output | Open-drain reset output asserting low if any monitored supply falls below threshold for timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously supervises 3.3V, 1.2V, and adjustable supply with independent comparators and thresholds |
| ±1.5% threshold accuracy | Reduces system voltage margin requirements by >50% vs. ±3% supervisors, improving reliability at low supply voltages |
| Configurable reset timeout | Internal 200ms option eliminates external capacitor; external CTMR support enables precise timing from 15ms to >1s |
| Power-fail early warning | PFO output asserts before RST, enabling controlled shutdown sequence initiation (e.g., NMI to processor) |
| Latch-mode margin testing | TMR pin pull-down holds RST state indefinitely, allowing stable under-voltage testing without spurious resets |
Applications
| Server Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 3.3V I/O, 1.2V core, and auxiliary 5V supply in rack-mounted server PSU with coordinated power-up/down sequencing. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion and PFO-triggered firmware save before main rail collapse. Use Value: Prevents data corruption during brown-out by issuing PFO interrupt 20ms before RST, enabling EEPROM write completion. | Use Scenario: Supervising 3.3V microcontroller, 1.2V FPGA core, and adjustable 12V battery-sensed rail in vehicle door module. IC Role / Device Role / Timing Role: Precision voltage monitor ensuring MCU remains in reset until all rails stabilize, with PFO signaling battery sag to trigger LED alerts. Use Value: ±1.5% threshold accuracy avoids false resets during cold-cranking (battery dip to 9V), maintaining CAN communication integrity. |
| Industrial PLC I/O Card | Medical Diagnostic Imaging Subsystem |
Use Scenario: Validating isolated 3.3V logic, 1.2V ADC reference, and adjustable sensor bias supply on modular I/O board operating in harsh EMI environments. IC Role / Device Role / Timing Role: Triple comparator with built-in glitch filter ensures reset remains asserted during transient noise spikes on 24V field bus coupling. Use Value: Input glitch immunity prevents nuisance resets during relay switching transients, improving MTBF in continuous operation. | Use Scenario: Monitoring 3.3V FPGA configuration, 1.2V image processor core, and adjustable high-voltage bias supply in portable ultrasound front-end. IC Role / Device Role / Timing Role: Latch-mode enabled via TMR for functional safety margin testing at reduced supply voltages per IEC 62304 clause 5.5.3. Use Value: TMR latch allows deterministic validation of reset behavior at 10% undervoltage without requiring dynamic supply adjustment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361TTT+T | Fixed 3.0V/1.2V/adj thresholds; 1.8% accuracy; no PFI/PFO; 140ms fixed timeout | Lacks power-fail warning capability and latch mode; requires external RC for timeout adjustment | Select when PFO early-warning and TMR latch are not required; lower cost for basic triple monitoring |
| TPS3808G33DBVR | Single 3.3V monitor only; 0.5% accuracy; 200ms/300ms selectable timeout; no V2/ADJ inputs | Cannot replace triple-monitor function; requires two additional ICs to match LTC2911ITS8-4 functionality | Use only as partial replacement where only 3.3V supervision is needed; not a functional substitute |
Compared with MAX6361TTT+T and TPS3808G33DBVR, the LTC2911ITS8-4 uniquely integrates triple-rail monitoring, power-fail warning, and latch-mode margin testing in a single TSOT-23-8 package-reducing BOM count, PCB area, and qualification effort for industrial and automotive applications requiring coordinated multi-rail supervision.
Availability
LTC2911ITS8-4 is available at Aetrix Electronics and suitable for server power sequencing, automotive body control modules, and industrial PLC I/O cards requiring stable component supply with guaranteed industrial-temperature operation and long-term lifecycle support.
Supply support for LTC2911ITS8-4 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC2911 family was designed specifically for precision multi-rail power supervision in mission-critical computing, automotive, and industrial systems where ±1.5% threshold accuracy and power-fail early warning are mandatory.
FAQ
What is the exact V2 threshold voltage for LTC2911ITS8-4?
The LTC2911ITS8-4 has a factory-trimmed V2 threshold of 1.122V (–6.5% of 1.2V) with ±1.5% accuracy over –40°C to 85°C. This value is specified in the Electrical Characteristics table under VRT12 parameter and confirmed across all temperature grades for the -4 variant. The threshold remains stable regardless of V1 or ADJ input conditions.
Does LTC2911ITS8-4 support internal 200ms reset timeout without external components?
Yes, LTC2911ITS8-4 supports internal 200ms reset timeout by tying the TMR pin directly to V1. This eliminates the need for an external timing capacitor and reduces bill-of-materials count. The internal timeout is guaranteed between 140ms and 280ms over temperature, with typical value at 200ms as stated in the tRST(INT) specification.
Can LTC2911ITS8-4 monitor a 5V supply on the V2 pin?
No, LTC2911ITS8-4 is the -4 variant and is factory-configured exclusively for 1.2V monitoring on V2. To monitor 5V, use LTC2911ITS8-1 instead. The V2 threshold is hard-coded per part number: -1=5V, -2=2.5V, -3=1.8V, -4=1.2V, -5=adjustable. Mixing variants invalidates the specified thresholds.
What is the minimum operating voltage for LTC2911ITS8-4 to guarantee RST and PFO outputs?
The LTC2911ITS8-4 guarantees valid RST and PFO logic states down to 0.5V VCC, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics (VCC,OP = 2.3V min for PFO high, but RST/PFO low operation is guaranteed at 0.5V). This enables robust reset assertion during deep brown-out conditions before system logic fails.
How does the PFI hysteresis work in LTC2911ITS8-4?
The PFI input in LTC2911ITS8-4 has asymmetric hysteresis: 500mV falling-edge threshold and 515mV rising-edge threshold, yielding 15mV nominal hysteresis. This prevents oscillation during slow-moving or noisy supply transitions and is intrinsic to the comparator design-no external components are needed to achieve it.
LTC2911ITS8-4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.122V, 3.086V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911ITS8-4 FAQ
1.How can I place an order for LTC2911ITS8-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911ITS8-4 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 LTC2911ITS8-4 reliable?
The price and inventory of LTC2911ITS8-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911ITS8-4 is usually 5 days.
3.What payment methods are accepted for LTC2911ITS8-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911ITS8-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911ITS8-4?
LTC2911ITS8-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911ITS8-4 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 LTC2911ITS8-4?
For technical support, including LTC2911ITS8-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911ITS8-4 requirements.
6.How does Aetrix verify that LTC2911ITS8-4 is sourced from the original manufacturer or authorized distributors?
All LTC2911ITS8-4 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 LTC2911ITS8-4 meets industry standards.
7.What is the process for return or replacement of LTC2911ITS8-4?
All LTC2911ITS8-4 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911ITS8-4, 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 LTC2911ITS8-4 part is unused and in its original packaging.
Return procedure for LTC2911ITS8-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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