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Analog Devices Inc. LTC1326IS8-2.5#PBF
- Part No.:
- LTC1326IS8-2.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1326IS8-2.5#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:415
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Product details
Overview
LTC1326IS8-2.5#PBF from Analog Devices (formerly Linear Technology) is a micropower precision triple supply monitor IC designed for systems requiring simultaneous supervision of 2.5V, 3.3V, and an adjustable supply (VCCA). It delivers ±0.75% threshold accuracy, 20µA typical supply current, 200ms internal reset delay, active-low/open-drain RST and SRST outputs, and guaranteed reset assertion down to VCC25 ≥ 1V or VCC3 ≥ 1V - enabling reliable power-up sequencing in portable battery-powered equipment and notebook computers.
For engineers reviewing the LTC1326IS8-2.5#PBF datasheet, LTC1326IS8-2.5#PBF pinout, LTC1326IS8-2.5#PBF application, or LTC1326IS8-2.5#PBF equivalent, key selection criteria include its 2.5V/3.3V/ADJ monitoring capability, -40°C to +85°C industrial temperature grade, SO-8 package, push-button soft-reset timing (100µs), and glitch-immune comparator architecture with 13µs response time.
Technical Context
The LTC1326IS8-2.5#PBF integrates three independent high-accuracy voltage comparators (VRT25 = 2.363V typ, VRT3 = 3.118V typ, VRTA = 1.000V typ) with 13µs response time to suppress transients. Its internal reset generator asserts RST low for 200ms after all supplies exceed thresholds, while PBR input enables dual-mode reset: <2s press triggers 100µs SRST pulse; >2s press initiates full 200ms RST assertion.
Power detection logic selects gate drive for the RST output FET from either VCC25 or VCC3-whichever is higher-ensuring valid reset state down to 1V on either rail. The device operates from VCC3 only, with VCC25 and VCCA as sense inputs; VCCA supports 1V logic-level detection and can be tied to VCC3 or VCC25 for dual/single-supply configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | VCC25 (2.5V), VCC3 (3.3V), VCCA (adjustable 1V threshold) |
| Threshold Accuracy | ±0.75% over –40°C to +85°C - ensures reliable brownout detection without false resets |
| Quiescent Current | 20µA typical at TA = 25°C - enables multi-year battery life in portable systems |
| Reset Pulse Width | 200ms nominal - meets standard power-on reset timing requirements |
| Soft Reset Pulse Width | 100µs typical - allows microprocessor reset without disturbing DRAM refresh |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded applications |
| Reset Output Type | Open-drain RST and SRST with weak 6µA internal pull-up to VCC3 - supports OR-tied reset buses |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150-inch body), RoHS-compliant, lead-free (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V supply sense input & IC power rail | Primary power source for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor to GND |
| VCC25 (Pin 2) | 2.5V supply sense input | Provides gate drive for RST output FET when VCC25 > VCC3; unused pins may be tied to VCC3 |
| VCCA (Pin 3) | Adjustable supply sense input (1V threshold) | High-impedance input for monitoring logic rails or DC/DC feedback dividers; trip point fixed at 1.000V |
| GND (Pin 4) | Ground reference | Common return path for all internal comparators and outputs |
| PBR (Pin 8) | Push-button reset input | Active-low, internally pulled up to VCC3 with 7µA; debounced (35ms typ); enables soft/hard reset mode selection |
| SRST (Pin 7) | Soft reset output | Active-low open-drain output asserted for 100µs after brief PBR press; supports OR-tie with other reset sources |
| RST (Pin 6) | Primary reset output | Active-low open-drain output asserted for 200ms after power-up/brownout or long PBR press; driven by VCC25 or VCC3 |
| RST (Pin 5) | Complementary reset output | Active-high CMOS output buffered inverse of RST; driven to VCC3; requires external pull-down if used |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent supply monitoring | Simultaneous supervision of 2.5V, 3.3V, and adjustable 1V rail - eliminates need for multiple discrete supervisors |
| Glitch-immune comparator architecture | 13µs response time + internal filtering - prevents false resets from µs-scale supply transients |
| Dual-mode push-button reset | Configurable soft reset (100µs) or hard reset (200ms) via single PBR pin - simplifies front-panel interface design |
| Low-voltage reset guarantee | RST asserted down to VCC25 ≥ 1V or VCC3 ≥ 1V - ensures valid reset state during deep brownout conditions |
| Flexible supply configuration | VCC25 and VCCA inputs can be disabled by tying to VCC3 - enables use as dual- or single-supply monitor |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Supervising 2.5V core, 3.3V I/O, and 1V memory termination rails during cold boot and thermal throttling. IC Role / Device Role / Timing Role: Triple-supply monitor providing synchronized 200ms power-on reset and brownout protection across CPU, chipset, and memory subsystems. Use Value: Prevents system lockup by ensuring all rails stabilize before release of RST, leveraging ±0.75% threshold accuracy to avoid marginal trips. | Use Scenario: Managing power sequencing in space-constrained laptop motherboards with 2.5V SoC, 3.3V peripherals, and adjustable DC/DC feedback voltage. IC Role / Device Role / Timing Role: Micropower supervisor (20µA) delivering precise reset timing and soft-reset capability for battery runtime optimization. Use Value: Enables 100µs SRST pulses to restart firmware without disrupting DRAM retention - critical for instant-on resume functionality. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring reliable startup and fault recovery in handheld test meters with isolated 2.5V analog front-end, 3.3V MCU, and 1V sensor bias rails. IC Role / Device Role / Timing Role: Industrial-grade (–40°C to +85°C) triple monitor asserting RST until all rails exceed thresholds for 200ms. Use Value: Guarantees reset validity down to VCC25 ≥ 1V - maintains system integrity during partial battery discharge or cold-temperature operation. | Use Scenario: Power management in medical wearables using 2.5V BLE radio, 3.3V MCU, and 1V biosensor interface. IC Role / Device Role / Timing Role: Low-quiescent-current (20µA) supervisor enabling multi-year battery life while supporting manual reset via tactile button. Use Value: Combines ultra-low ICC with ESD-hardened PBR pin (10kΩ series resistor option) for robust field operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1727-2.5 | Individual reset outputs per rail (RST25, RST33, RSTA); ±1.5% threshold accuracy; no soft-reset function | Used where independent reset control per supply is required, not just combined RST assertion | Select LTC1727-2.5 when per-rail reset signaling or margining is needed; LTC1326IS8-2.5#PBF is preferred for cost-sensitive designs needing only one RST output and soft-reset capability |
| LTC1726-2.5 | Includes programmable watchdog timer and adjustable reset timeout; 2.5V/3.3V/ADJ monitoring; same ±0.75% accuracy | Required in systems needing fail-safe MCU watchdog supervision in addition to power monitoring | Choose LTC1726-2.5 when watchdog functionality is mandatory; LTC1326IS8-2.5#PBF offers lower complexity and quiescent current (20µA vs 35µA) for pure power-monitoring use cases |
Compared with LTC1727-2.5 and LTC1726-2.5, the LTC1326IS8-2.5#PBF provides the lowest quiescent current (20µA), integrated soft-reset functionality, and simpler reset architecture - making it optimal for portable, cost-sensitive, and space-constrained applications where combined reset assertion suffices.
Availability
LTC1326IS8-2.5#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and portable battery-powered equipment requiring stable component supply with industrial temperature range support and RoHS compliance.
Supply support for LTC1326IS8-2.5#PBF 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 digital signal processing semiconductors.
The LTC1326 family was developed by Linear Technology specifically for micropower, high-accuracy power supply monitoring in space- and energy-constrained systems - emphasizing precision thresholding, glitch immunity, and flexible reset generation.
FAQ
What is the operating temperature range for the LTC1326IS8-2.5#PBF?
The LTC1326IS8-2.5#PBF is rated for industrial operation from –40°C to +85°C. This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The device's threshold accuracy (±0.75%), supply current (20µA typ), and reset timing (200ms) are all guaranteed across this full temperature span.
Does the LTC1326IS8-2.5#PBF support monitoring of a 2.5V supply?
Yes, the LTC1326IS8-2.5#PBF is specifically configured to monitor a 2.5V supply on Pin 2 (VCC25), with a typical reset threshold of 2.363V and ±0.75% accuracy over temperature. This distinguishes it from the base LTC1326 (which monitors 5V on Pin 2) and makes it ideal for modern low-voltage SoC and FPGA applications.
How does the push-button reset function work on the LTC1326IS8-2.5#PBF?
The LTC1326IS8-2.5#PBF implements dual-mode push-button reset on Pin 8 (PBR): a press <2 seconds generates a 100µs soft reset pulse on SRST (Pin 7); a press >2 seconds asserts RST (Pin 6) for 200ms. Internal debounce (35ms typ) prevents chatter, and the 7µA internal pull-up simplifies front-panel wiring.
Can the LTC1326IS8-2.5#PBF be used to monitor only two supplies?
Yes. The LTC1326IS8-2.5#PBF supports dual-supply operation by tying unused inputs: VCC25 (Pin 2) or VCCA (Pin 3) can be connected to VCC3 (Pin 1) to disable their respective comparators. This allows flexible configuration as a 3.3V+ADJ or 2.5V+ADJ monitor without external components.
What is the minimum supply voltage required for the LTC1326IS8-2.5#PBF to assert a valid reset?
The LTC1326IS8-2.5#PBF guarantees correct RST logic state (low) for VCC25 ≥ 1V or VCC3 ≥ 1V. This means the device remains functional and asserts reset even during deep brownout conditions - a critical feature for maintaining system integrity in battery-powered applications where supply voltages sag below nominal levels.
LTC1326IS8-2.5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.363V, 3.118V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1326IS8-2.5#PBF FAQ
1.How can I place an order for LTC1326IS8-2.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326IS8-2.5#PBF 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 LTC1326IS8-2.5#PBF reliable?
The price and inventory of LTC1326IS8-2.5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326IS8-2.5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1326IS8-2.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326IS8-2.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326IS8-2.5#PBF?
LTC1326IS8-2.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326IS8-2.5#PBF 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 LTC1326IS8-2.5#PBF?
For technical support, including LTC1326IS8-2.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326IS8-2.5#PBF requirements.
6.How does Aetrix verify that LTC1326IS8-2.5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1326IS8-2.5#PBF 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 LTC1326IS8-2.5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1326IS8-2.5#PBF?
All LTC1326IS8-2.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326IS8-2.5#PBF, 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 LTC1326IS8-2.5#PBF part is unused and in its original packaging.
Return procedure for LTC1326IS8-2.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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