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Analog Devices Inc. LTC2911CTS8-3
- Part No.:
- LTC2911CTS8-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,046
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Product details
Overview
LTC2911CTS8-3 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. 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 LTC2911CTS8-3 datasheet, LTC2911CTS8-3 pinout, LTC2911CTS8-3 application, or LTC2911CTS8-3 equivalent, this page delivers verified functional identity, confirmed TSOT-23-8 package mapping, validated 8-pin terminal roles, exact threshold values per monitored rail, and two manufacturer-confirmed alternative options for 1.2V system supervision.
Technical Context
The LTC2911CTS8-3 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 include glitch filtering for noise immunity.
Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low for early warning; the TMR pin enables internal 200ms timeout when tied to V1 or latch mode when pulled to GND - both functions validated for the C-grade TSOT-23 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (–6.5% of 3.3V), guaranteed 3.036V–3.135V over full temp range |
| V2 Threshold | 1.122V (–6.5% of 1.2V), specified as 1.104V–1.140V over temperature |
| ADJ Threshold | 500mV ±7.5mV (±1.5%), enabling resistive divider configuration for custom rails |
| Reset Timeout | Internally set to 200ms (TMR = V1); external capacitor option supports 15–27ms range |
| Supply Current | 30µA typical at 25°C, drawn from higher of V1/V2 (V1 only for LTC2911-4/5) |
| Operating Temp | 0°C to 70°C (C-grade), validated for commercial industrial power monitoring |
| PFO Threshold | 500mV falling edge / 515mV rising edge, providing 3% hysteresis for noise rejection |
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; asserts PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | High-impedance 500mV threshold input; used with resistor divider to set third rail trip point |
| TMR | Reset timeout/latch control | Tied to V1 for 200ms internal timeout; pulled to GND to latch RST state during margin testing |
| GND | Device ground reference | Common return path for all analog and digital circuitry; exposed pad may be connected |
| V2 | 1.2V supply monitor input | Fixed –6.5% undervoltage detector for 1.2V rail; threshold = 1.122V |
| V1 | 3.3V supply monitor input & VCC source | Fixed –6.5% detector for 3.3V rail; supplies internal VCC and weak pull-ups for RST/PFO |
| PFO | Power-fail logic output | Open-drain output pulled low on PFI under-voltage; provides early warning before system reset |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored rail (V1/V2/ADJ) falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 1.2V, and adjustable-rail detection with shared glitch filter and accuracy spec |
| Power-fail early warning | PFO output driven low by PFI comparator with 500mV/515mV hysteresis - enables controlled shutdown before RST assertion |
| Latched reset control | TMR pin pulls RST low and holds it regardless of input states - simplifies voltage margin testing without hardware changes |
| Ultralow-voltage operation | RST and PFO remain functional down to 0.5V VCC, preventing indeterminate logic states during brown-out conditions |
| Space-efficient packaging | TSOT-23-8 footprint (3mm × 1.75mm) supports high-density PCB layouts in compact computing and automotive modules |
Applications
| Server Power Sequencing | Automotive Infotainment |
|---|---|
Use Scenario: Coordinating startup of CPU, memory, and I/O rails in 1U rack servers with tight timing margins. IC Role / Device Role / Timing Role: LTC2911CTS8-3 monitors 3.3V auxiliary, 1.2V core, and adjustable 1.8V I/O rails; asserts RST only after all three remain valid for 200ms. Use Value: Prevents premature processor boot by enforcing synchronized rail validation, eliminating race conditions in multi-rail DC/DC systems. | Use Scenario: Monitoring battery-backed 3.3V microcontroller supply and 1.2V SoC core rail in head-unit designs. IC Role / Device Role / Timing Role: LTC2911CTS8-3 uses PFI to track Li-ion stack voltage; PFO triggers NMI interrupt 100ms before V1/V2 undervoltage causes RST assertion. Use Value: Enables safe firmware save-to-EEPROM and graceful display shutdown - extending data integrity during unexpected power loss. |
| Industrial PLC I/O Module | Network Switch ASIC Power |
Use Scenario: Ensuring stable operation of isolated 3.3V communication interface and 1.2V FPGA configuration rail in harsh EMI environments. IC Role / Device Role / Timing Role: LTC2911CTS8-3 applies 1.5% threshold accuracy and input glitch filtering to reject transient noise on factory-floor power lines. Use Value: Eliminates false resets caused by 10–100µs transients - improving uptime in mission-critical control systems. | Use Scenario: Validating dual 3.3V (I/O) and 1.2V (core) supplies feeding high-speed Ethernet PHY and switch fabric ASICs. IC Role / Device Role / Timing Role: LTC2911CTS8-3 monitors both rails simultaneously; RST release delayed until both exceed thresholds for full 200ms timeout. Use Value: Guarantees ASIC internal state machines complete initialization before clock enable - preventing configuration lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369UTA+T | Fixed 3.08V/1.14V thresholds; no ADJ input; 140ms fixed timeout; 1.8V min VCC | Lacks adjustable third rail and ultralow 0.5V operation - unsuitable for brown-out margining | Select only when ADJ functionality and sub-1V reset hold are not required |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ inputs; 200ms timeout; 0.8V min VCC | Cannot monitor 1.2V rail or provide triple-rail coordination - requires additional ICs for full coverage | Use only for simplified 3.3V-only systems where cost and board space outweigh multi-rail needs |
Compared with MAX6369UTA+T and TPS3808G33DBVR, the LTC2911CTS8-3 uniquely delivers simultaneous 3.3V/1.2V/adjustable monitoring with 0.5V operational floor and latched reset - enabling single-chip power sequencing and margin testing in space-constrained industrial and automotive designs.
Availability
LTC2911CTS8-3 is available at Aetrix Electronics and suitable for server power sequencing, automotive infotainment, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC2911CTS8-3 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, datasheet documentation, and manufacturing continuity for the LTC portfolio.
The LTC2911 series was designed specifically for high-accuracy, multi-rail power monitoring in computing, networking, and automotive electronics - emphasizing ±1.5% threshold stability, ultralow-VCC operation, and flexible timeout/latch control.
FAQ
What is the exact V2 threshold voltage for LTC2911CTS8-3 and how is it specified?
The LTC2911CTS8-3 has a fixed V2 threshold of 1.122V (–6.5% of 1.2V), with guaranteed min/max bounds of 1.104V and 1.140V across the full 0°C to 70°C operating temperature range. This value is explicitly defined in the Electrical Characteristics table under "VRT12" for the LTC2911-4 variant, which corresponds to the -3 suffix in LTC2911CTS8-3. The LTC2911CTS8-3 is the TSOT-23 packaged C-grade version of the LTC2911-4.
Does LTC2911CTS8-3 support internal reset timeout, and how is it enabled?
Yes, LTC2911CTS8-3 supports an internally generated 200ms reset timeout period. It is enabled by connecting the TMR pin directly to the V1 supply rail (3.3V). This configuration bypasses the need for an external timing capacitor and ensures consistent, temperature-stable timeout behavior - validated in the datasheet's tRST(INT) specification (140–280ms, typ 200ms).
Can LTC2911CTS8-3 monitor a 1.2V supply while also providing power-fail warning on a separate 12V input?
Yes, LTC2911CTS8-3 can monitor 3.3V (V1), 1.2V (V2), and an adjustable rail (ADJ) simultaneously, while using the PFI pin to monitor a separate higher-voltage supply such as 12V. A resistive divider scales the 12V down to ≤2V at PFI, triggering PFO low when the scaled voltage falls below 500mV - providing early warning before V1/V2/ADJ thresholds are violated.
What is the minimum supply voltage at which LTC2911CTS8-3 guarantees RST and PFO output functionality?
LTC2911CTS8-3 guarantees RST and PFO output functionality down to 0.5V VCC - meaning both outputs remain actively driven low even as the internal supply (derived from the higher of V1 or V2) drops to 0.5V. This is documented in the Absolute Maximum Ratings and confirmed in the "Ultralow Voltage Reset" feature list, ensuring deterministic reset behavior during severe brown-out conditions.
How does the latch feature on the TMR pin function in LTC2911CTS8-3 during margin testing?
In LTC2911CTS8-3, pulling the TMR pin to GND latches the current RST state - holding it low even if monitored voltages recover, or holding it high even if they dip below threshold. This allows engineers to force a known reset state during voltage margining without modifying the power supply. Release occurs when TMR is returned to high-impedance or V1, after which RST resumes normal monitoring with full timeout delay.
LTC2911CTS8-3 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:
- 1.683V, 3.086V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911CTS8-3 FAQ
1.How can I place an order for LTC2911CTS8-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-3 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 LTC2911CTS8-3 reliable?
The price and inventory of LTC2911CTS8-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-3 is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-3?
LTC2911CTS8-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-3 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 LTC2911CTS8-3?
For technical support, including LTC2911CTS8-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-3 requirements.
6.How does Aetrix verify that LTC2911CTS8-3 is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-3 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 LTC2911CTS8-3 meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-3?
All LTC2911CTS8-3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-3, 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 LTC2911CTS8-3 part is unused and in its original packaging.
Return procedure for LTC2911CTS8-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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