My Inquiry
My Account
Analog Devices Inc. LTC2911CTS8-4
- Part No.:
- LTC2911CTS8-4
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-4.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,221
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2911CTS8-4 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator, designed for systems requiring simultaneous monitoring of 3.3V, 1.2V, and an adjustable supply. It delivers ±1.5% threshold accuracy over –40°C to 85°C, 30µA typical quiescent current, and supports internal 200ms or external capacitor–programmable reset timeout. Used in industrial power sequencing and embedded control where reliable undervoltage detection is critical.
For engineers reviewing the LTC2911CTS8-4 datasheet, LTC2911CTS8-4 pinout, LTC2911CTS8-4 application, or LTC2911CTS8-4 equivalent, key selection criteria include its fixed 3.3V/1.2V dual-supply monitoring configuration, 0.5V ADJ input threshold, PFI-based early power-fail warning capability, and TSOT-23-8 package compatibility with margin testing via TMR latch.
Technical Context
The LTC2911CTS8-4 implements three independent voltage comparators: V1 monitors 3.3V (–6.5% trip = 3.086V), V2 monitors 1.2V (–6.5% trip = 1.122V), and ADJ monitors an externally configured supply via resistive divider with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and integrated glitch filtering.
Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low before main supply collapse, enabling controlled shutdown. The TMR pin supports three modes: external capacitor timing (9.4ms/nF), internal 200ms timeout (TMR tied to V1), or RST latching (TMR pulled to GND) for margin testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (3.3V – 6.5%), guaranteed ±1.5% over –40°C to 85°C - ensures reliable 3.3V rail supervision without false resets |
| V2 Threshold | 1.122V (1.2V – 6.5%), ±1.5% accuracy - enables precise monitoring of low-voltage logic rails like 1.2V FPGA core supplies |
| ADJ Threshold | 500mV ±7.5mV - allows configurable third-supply monitoring using external resistor divider |
| PFI Threshold | 500mV falling / 515mV rising (3% hysteresis) - provides noise-immune early warning of primary supply decay |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms with 2.2nF external capacitor - selectable delay prevents premature system boot |
| Quiescent Current | 30µA typical - minimizes loading on monitored supplies during normal operation |
| Operating Temp | –40°C to 85°C (I-grade) - suitable for industrial environments without derating |
Pinout & Package
Package: 8-Lead 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 primary supply via resistive divider; triggers PFO low at 500mV falling edge for early warning |
| ADJ | Adjustable monitor input | 0.5V threshold input for third supply; requires external divider to set trip point |
| TMR | Reset timeout/latch control | Selects internal 200ms timer (tie to V1), external RC timing (cap to GND), or RST latch (pull to GND) |
| GND | Device ground reference | Return path for all internal comparators and output drivers; exposed pad may be connected |
| V2 | 1.2V supply monitor input | Dedicated 1.2V rail input with 1.122V trip point; high-impedance, low bias current (≤30µA) |
| V1 | 3.3V supply monitor input & VCC source | 3.3V rail input (3.086V trip); powers internal circuitry and provides weak pull-up for RST/PFO |
| PFO | Power-fail logic output | Open-drain output pulled low when PFI < 500mV; signals imminent supply failure to processor interrupt |
| RST | Reset logic output | Open-drain reset output asserted low if any monitored supply falls below threshold for timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent V1 (3.3V), V2 (1.2V), and ADJ (adjustable) inputs eliminate need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >1.5% vs. ±2.5% parts, improving reliability at low supply tolerances |
| Configurable power-fail warning | PFI input with 3% hysteresis enables robust early detection of primary supply decay before critical rails fail |
| Reset latch for margin testing | TMR pin latches RST state, allowing stable system operation during supply voltage stress testing |
| Low 30µA quiescent current | Minimizes impact on battery-backed or energy-constrained systems without sacrificing accuracy |
Applications
| Industrial PLC Power Sequencing | Automotive Infotainment Core Supply Monitoring |
|---|---|
Use Scenario: Monitoring 3.3V I/O, 1.2V SoC core, and 5V analog supply in programmable logic controller backplane. IC Role / Device Role / Timing Role: LTC2911CTS8-4 supervises three rails simultaneously and asserts RST only after all remain valid for 200ms, preventing spurious reboots during transient brownouts. Use Value: Eliminates need for three separate reset ICs while guaranteeing coordinated reset assertion with ±1.5% threshold matching across rails. | Use Scenario: Validating 3.3V MCU interface, 1.2V processor core, and adjustable 1.8V display supply in automotive head unit. IC Role / Device Role / Timing Role: LTC2911CTS8-4 uses ADJ input to monitor 1.8V rail via resistor divider and PFI to detect battery voltage sag before main rails collapse. Use Value: Enables early PFO-driven NMI interrupt for safe state save prior to full system reset, meeting ASIL-B functional safety requirements. |
| Network Equipment Hot-Swap Control | Medical Diagnostic Imaging Power Integrity |
Use Scenario: Supervising 3.3V management bus, 1.2V FPGA fabric, and adjustable 2.5V ADC supply in modular switch line card. IC Role / Device Role / Timing Role: LTC2911CTS8-4 leverages TMR latch mode during hot-swap insertion to hold RST high until all rails stabilize, avoiding false resets during inrush. Use Value: Ensures deterministic power-up sequence without external timing components or firmware intervention. | Use Scenario: Monitoring 3.3V sensor interface, 1.2V digital signal processor, and adjustable 3.3V analog front-end supply in MRI subsystem. IC Role / Device Role / Timing Role: LTC2911CTS8-4 uses PFI to track DC/DC converter input voltage and triggers PFO before V1/V2 undervoltage, enabling graceful shutdown of image acquisition. Use Value: Prevents data corruption by initiating nonvolatile memory write 200ms before final rail collapse, verified per IEC 62304 clause 5.5.3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US29D3+T | Fixed 2.93V reset threshold; single-supply monitor with manual reset input; no PFI or ADJ functionality | Only monitors one rail; lacks power-fail warning and adjustable third input | Use only when single-rail supervision suffices and PFI/ADJ features are unnecessary |
| TPS3808G33DBVR | Single 3.3V supervisor with 200ms timeout; no V2/ADJ/PFI inputs; 35µA quiescent current | Cannot monitor 1.2V or adjustable supplies; no early power-fail signaling capability | Select only for cost-sensitive 3.3V-only applications where multi-rail supervision is not required |
Compared with MAX6314US29D3+T and TPS3808G33DBVR, the LTC2911CTS8-4 uniquely integrates triple-rail monitoring, PFI-based predictive power-fail detection, and TMR latch for margin testing-enabling compact, high-reliability designs where coordinated multi-supply supervision is mandatory.
Availability
LTC2911CTS8-4 is available at Aetrix Electronics and suitable for industrial PLC power sequencing, automotive infotainment core supply monitoring, and network equipment hot-swap control requiring stable component supply across extended temperature ranges.
Supply support for LTC2911CTS8-4 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed by Analog Devices to deliver precision multi-rail supervision with predictive power-fail capability for mission-critical embedded systems where reliability and timing predictability are essential.
FAQ
What is the exact reset threshold voltage for the V2 pin on the LTC2911CTS8-4?
The V2 pin on the LTC2911CTS8-4 has a nominal 1.2V supply monitor threshold of 1.122V (1.2V – 6.5%), with guaranteed ±1.5% accuracy over the full –40°C to 85°C operating range. This corresponds to a minimum threshold of 1.104V and maximum of 1.140V, ensuring robust detection of 1.2V rail undervoltage without false triggering due to tolerance stack-up.
Can the LTC2911CTS8-4 monitor a 1.8V supply instead of the specified 1.2V on V2?
No - the LTC2911CTS8-4 is factory-configured for 3.3V on V1 and 1.2V on V2. To monitor 1.8V, you must select the LTC2911CTS8-3 variant, which has a fixed 1.8V V2 threshold (1.683V trip). The -4 suffix denotes the 1.2V option; substituting it for 1.8V monitoring violates the device's specified electrical characteristics and voids accuracy guarantees.
How does the PFI input on the LTC2911CTS8-4 differ from the ADJ input?
The PFI input on the LTC2911CTS8-4 has a dedicated 500mV falling / 515mV rising threshold with 3% hysteresis for noise-immune power-fail detection, while the ADJ input has a fixed 500mV threshold (±7.5mV) with no hysteresis, intended for adjustable supply monitoring via resistive divider. PFI drives the PFO output directly; ADJ contributes to the RST assertion logic only.
What happens to the RST output of the LTC2911CTS8-4 when V1 drops below 0.5V?
The LTC2911CTS8-4 maintains valid RST output down to VCC = 0.5V - meaning RST remains logic-low even as V1 collapses to 0.5V, preventing indeterminate states during power-down. This ultralow-voltage reset capability is enabled by proprietary low-voltage drive circuitry and is guaranteed across temperature for reliable shutdown sequencing.
Is the TSOT-23-8 package of the LTC2911CTS8-4 compatible with standard 0.65mm pitch PCB footprints?
Yes - the LTC2911CTS8-4 in TSOT-23-8 (TS8) package uses a standard 0.65mm lead pitch and 3mm × 1.75mm body size, fully compatible with IPC-7351B SOIC-8 land patterns adapted for thin-outline packages. The exposed pad is optional and does not require solder connection unless thermal performance beyond θJA = 195°C/W is needed.
LTC2911CTS8-4 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911CTS8-4 FAQ
1.How can I place an order for LTC2911CTS8-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-4 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 LTC2911CTS8-4 reliable?
The price and inventory of LTC2911CTS8-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-4 is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-4?
LTC2911CTS8-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-4 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 LTC2911CTS8-4?
For technical support, including LTC2911CTS8-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-4 requirements.
6.How does Aetrix verify that LTC2911CTS8-4 is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-4 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 LTC2911CTS8-4 meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-4?
All LTC2911CTS8-4 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-4, 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 LTC2911CTS8-4 part is unused and in its original packaging.
Return procedure for LTC2911CTS8-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2911CTS8-4 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
