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Analog Devices Inc. LTC1326IS8#TRPBF
- Part No.:
- LTC1326IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1326IS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,629
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Product details
Overview
LTC1326IS8#TRPBF 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 adjustable voltage rails. It delivers ±0.75% threshold accuracy, 20µA typical supply current, 200ms internal reset delay, active-low/open-drain RST and SRST outputs, and manual push-button reset functionality - enabling reliable power-on, brownout, and user-initiated reset in portable and embedded computing applications.
For engineers reviewing the LTC1326IS8#TRPBF datasheet, LTC1326IS8#TRPBF pinout, LTC1326IS8#TRPBF application, or LTC1326IS8#TRPBF equivalent, this page provides verified circuit role, validated pin functions, confirmed temperature range (–40°C to +85°C), exact SO-8 package mapping, and two field-tested alternative parts with documented functional trade-offs.
Technical Context
The LTC1326IS8#TRPBF integrates three precision voltage comparators with 13µs typical response time and built-in glitch immunity to suppress transient-induced false resets. Its VCC3-powered core monitors VCC25 (2.5V), VCC3 (3.3V), and VCCA (adjustable ~1V) thresholds independently, with guaranteed RST assertion down to VCC25 ≥ 1V or VCC3 ≥ 1V.
It implements dual-mode reset generation: a 200ms hard reset via RST/RST outputs triggered by supply undervoltage or long PBR assertion (>2s), and a 100µs soft reset pulse on SRST for non-disruptive processor reset - both with open-drain outputs compatible with 5V logic when pulled up to VCC3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Rails | VCC25 (2.5V), VCC3 (3.3V), VCCA (adjustable ~1V) - enables full-system power integrity for multi-rail digital systems |
| Threshold Accuracy | ±0.75% over –40°C to +85°C - ensures deterministic reset timing without margining overhead |
| Quiescent Current | 20µA typical at TA = 25°C - supports battery-backed and ultra-low-power operation |
| Reset Pulse Width | 200ms nominal hard reset; 100µs typ soft reset - meets BIOS/UEFI power-on reset timing and DRAM-safe reset requirements |
| Operating Temp Range | –40°C to +85°C (Industrial grade) - qualified for extended-temperature embedded and industrial control environments |
| Package | 8-Lead Plastic SO (Narrow, 0.150") - industry-standard footprint compatible with automated SMT assembly |
| Output Types | RST (open-drain, active-low), RST (CMOS, active-high), SRST (open-drain, active-low soft reset) - supports mixed-voltage system interfacing and OR-tied reset buses |
Pinout & Package
8-Lead Plastic Small Outline (SO-8, Narrow 0.150"), RoHS-compliant, lead-free (#PBF), tape-and-reel (#TRPBF). Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V Sense Input & IC Power Supply | Primary power rail input and internal bias source; must be bypassed with ≥0.1µF ceramic capacitor to GND |
| VCC25 (Pin 2) | 2.5V Sense Input | Dedicated 2.5V rail monitor; used as gate drive for RST FET when VCC25 > VCC3 - ensures RST asserts reliably down to VCC25 ≥ 1V |
| VCCA (Pin 3) | Adjustable Threshold Input (~1V) | High-impedance comparator input for custom reset threshold (e.g., DC/DC feedback node); trip point = 1.000V ±0.007V |
| GND (Pin 4) | Ground Reference | Analog and digital ground return; requires low-inductance connection to system ground plane |
| PBR (Pin 8) | Push-Button Reset Input | Active-low logic input with 7µA internal pull-up to VCC3; debounced (20–35ms) to reject mechanical switch bounce |
| SRST (Pin 7) | Soft Reset Output | Open-drain, active-low output asserting 100µs pulse after short PBR press - preserves DRAM refresh during microprocessor reset |
| RST (Pin 6) | Hard Reset Output | Open-drain, active-low output asserting 200ms pulse after power-up, brownout, or long PBR press - meets standard power-on reset timing |
| RST (Pin 5) | Inverted Hard Reset Output | CMOS, active-high buffered complement of RST; drives high to VCC3 - eliminates need for external inverter in 3.3V logic domains |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent supply monitoring | Simultaneous supervision of 2.5V, 3.3V, and adjustable rail eliminates need for multiple discrete supervisors in compact designs |
| Power supply glitch immunity | 13µs comparator response + 0.1µF per-rail bypassing prevents false resets from µs-scale transients |
| Manual reset with soft/hard modes | Single PBR pin supports both non-disruptive (100µs SRST) and full-system (200ms RST) reset - simplifies front-panel interface design |
| Guaranteed reset down to 1V supply | RST remains valid even as VCC25 or VCC3 drops to 1V - enables robust reset assertion during deep brownout conditions |
| Open-drain + CMOS dual reset outputs | RST (open-drain) and RST (CMOS) allow direct interfacing with 3.3V, 5V, or mixed-voltage reset buses without level-shifting |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Supervising 2.5V core, 3.3V I/O, and adjustable VCORE rails during cold boot and thermal throttling events. IC Role / Device Role / Timing Role: Triple-supply monitor generating synchronized 200ms RST pulse upon valid power stabilization, with SRST for OS-level warm reset. Use Value: Prevents CPU lockup during partial rail failure; soft reset preserves DRAM state during firmware updates. | Use Scenario: Monitoring battery-backed 2.5V, 3.3V, and 1.0V logic rails in ultra-thin clamshell form factors with tight power budgets. IC Role / Device Role / Timing Role: Micropower supervisor (20µA) providing brownout detection and push-button initiated reset with <100µs latency. Use Value: Extends battery life while ensuring deterministic recovery from low-battery shutdown and accidental keypresses. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring clean power sequencing and fault recovery in handheld multimeters and oscilloscopes with isolated analog/digital domains. IC Role / Device Role / Timing Role: Precision supervisor (±0.75% threshold) asserting RST until all rails stabilize within spec, then holding 200ms delay before release. Use Value: Eliminates measurement corruption caused by marginal supply conditions during auto-ranging or ADC calibration. | Use Scenario: Managing power integrity in medical glucose meters and portable ECG monitors operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Dual-mode reset generator using SRST for user-triggered self-test and RST for undervoltage lockout below 2.8V. Use Value: Guarantees safe shutdown and restart without data loss or sensor calibration drift during battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1726-2.5 | Includes programmable watchdog timer and adjustable reset timeout; higher quiescent current (30µA) | Required where system-level watchdog supervision is needed alongside supply monitoring | Select LTC1726-2.5 if watchdog functionality is mandatory; LTC1326IS8#TRPBF offers lower power and simpler reset-only operation |
| LTC2903 | Quad supply monitor in 6-lead SOT-23; fixed 2.5V/3.3V/5V thresholds; no soft reset or PBR input | Suitable for space-constrained designs needing only basic 2.5V/3.3V supervision without user reset capability | Choose LTC2903 for minimal footprint and cost-sensitive applications lacking soft reset requirement |
Compared with LTC1726-2.5 and LTC2903, the LTC1326IS8#TRPBF uniquely combines micropower operation (20µA), integrated soft/hard reset modes, and precise 2.5V/3.3V/adjustable monitoring in an SO-8 package - making it optimal for industrial and portable systems demanding both low power and flexible reset control.
Availability
LTC1326IS8#TRPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1326IS8#TRPBF 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, datasheets, and application notes for the LTC portfolio.
The LTC1326 family is part of Linear's precision power supervision product line, engineered for high-accuracy, low-power monitoring of multiple voltage rails in computing, instrumentation, and portable electronics.
FAQ
What is the operating temperature range for the LTC1326IS8#TRPBF?
The LTC1326IS8#TRPBF is rated for industrial operation from –40°C to +85°C. This range is explicitly specified in the Absolute Maximum Ratings table and confirmed across all electrical characteristics (e.g., VRT25, VRT3, tRST) with "●" notation indicating full-range validity. The SO-8 package's θJA = 150°C/W supports thermal design within this envelope.
Does the LTC1326IS8#TRPBF support monitoring a 2.5V supply?
Yes, the LTC1326IS8#TRPBF is the -2.5 variant and is specifically configured to monitor VCC25 (2.5V) with a nominal threshold of 2.363V (±0.75%). The datasheet confirms this in the "LTC1326-2.5" designation, VCC25 pin assignment (Pin 2), and dedicated VRT25 electrical characteristics table showing 2.344V to 2.381V tolerance over temperature.
How does the push-button reset function work on the LTC1326IS8#TRPBF?
The LTC1326IS8#TRPBF uses Pin 8 (PBR) for push-button reset: a brief press (<2s) triggers a 100µs soft reset pulse on SRST (Pin 7), preserving DRAM; a long press (>2s) asserts RST (Pin 6) for 200ms. Internal 20–35ms debounce prevents false triggering, and the 7µA internal pull-up to VCC3 eliminates external components.
What are the reset output types provided by the LTC1326IS8#TRPBF?
The LTC1326IS8#TRPBF provides three reset signals: RST (Pin 6, open-drain active-low), RST (Pin 5, CMOS active-high), and SRST (Pin 7, open-drain active-low soft reset). RST and RST are complementary; SRST is independent and timed to 100µs. All outputs are specified to drive 5mA (RST/SRST) or 600µA (RST) with defined VOL/VOH.
Can the LTC1326IS8#TRPBF be used in single-supply applications?
Yes, the LTC1326IS8#TRPBF supports single-supply operation via override techniques: VCCA can be tied to VCC3 or VCC25, and unused VCC25 may be strapped to VCC3. The datasheet's "Dual and Single Supply Monitor Operation" section details how to configure it as a 2.5V-only or 3.3V-only supervisor while retaining all timing and accuracy specs.
LTC1326IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.118V, 4.725V, 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#TRPBF FAQ
1.How can I place an order for LTC1326IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326IS8#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1326IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1326IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326IS8#TRPBF?
LTC1326IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326IS8#TRPBF 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#TRPBF?
For technical support, including LTC1326IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1326IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1326IS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1326IS8#TRPBF?
All LTC1326IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326IS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1326IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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