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Analog Devices Inc. LTC1326IS8-2.5#TRPBF
- Part No.:
- LTC1326IS8-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1326IS8-2.5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,282
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Product details
Overview
LTC1326IS8-2.5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower 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 VCC3 ≥ 1V or VCC25 ≥ 1V. It is used in notebook computers and portable battery-powered equipment for reliable power-on and brownout reset generation.
For engineers reviewing the LTC1326IS8-2.5#TRPBF datasheet, LTC1326IS8-2.5#TRPBF pinout, LTC1326IS8-2.5#TRPBF application, or LTC1326IS8-2.5#TRPBF equivalent, key selection criteria include its 2.5V/3.3V/ADJ monitoring capability, 8-pin SOIC package, -40°C to +85°C industrial temperature range, push-button soft-reset functionality, and glitch-immune comparator architecture.
Technical Context
The LTC1326IS8-2.5#TRPBF integrates three precision voltage comparators with 13µs typical response time and built-in 25mV hysteresis to suppress transients. Its power-detect/gate-drive circuit selects between VCC25 and VCC3 to drive the RST output FET, ensuring valid reset assertion as low as 1V on either rail.
It features dual-mode push-button reset logic: sub-2-second PBR assertion triggers a 100µs soft reset (SRST), while >2-second assertion initiates a full 200ms hard reset (RST). The internal timer and debounce counter (20ms typical) prevent false triggering during mechanical switch bounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | VCC25 (2.5V), VCC3 (3.3V), VCCA (adjustable ~1V); enables multi-rail system supervision |
| Reset Threshold Accuracy | ±0.75% over –40°C to +85°C; ensures reliable reset timing across temperature and voltage drift |
| Quiescent Supply Current | 20µA typical at TA = 25°C; supports ultra-low-power battery-operated designs |
| Reset Pulse Width | 200ms nominal; provides sufficient hold time for microprocessor initialization and memory stabilization |
| Soft Reset Pulse Width | 100µs typical; allows DRAM refresh continuity during software-initiated resets |
| Operating Temperature Range | –40°C to +85°C (I-grade); qualified for industrial embedded applications |
| Power Supply Glitch Immunity | Validated via transient immunity curves (G05–G08); rejects <40µs supply spikes up to 0.1V overdrive |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 0.150-inch narrow body, RoHS-compliant, lead-free (#PBF), tape-and-reel (#TRPBF).
| 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 |
| VCC25 (Pin 2) | 2.5V supply sense input | Provides gate drive for RST FET when VCC25 > VCC3; unused pins may be tied to VCC3 |
| VCCA (Pin 3) | Adjustable supply sense input (1V threshold) | High-impedance comparator input for custom voltage monitoring; can serve as logic-level detector |
| GND (Pin 4) | Ground reference | Common return path for all internal comparators and output drivers |
| PBR (Pin 8) | Push-button reset input | Active-low, internally pulled up to VCC3 (7µA); debounced to reject <40ns glitches |
| SRST (Pin 7) | Soft reset output | Open-drain, active-low; asserts 100µs pulse after short PBR press; OR-tie capable |
| RST (Pin 6) | Hard reset output | Open-drain, active-low; asserts 200ms pulse after long PBR press or supply undervoltage |
| RST (Pin 5) | Complementary reset output | CMOS active-high buffered complement of RST; driven to VCC3 when RST is high |
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 |
| Guaranteed reset down to 1V supply | Ensures valid reset state even during deep brownout conditions on VCC25 or VCC3 rails |
| Manual push-button soft/hard reset | Single physical button generates either 100µs DRAM-safe reset or full 200ms power-on reset |
| Power-supply glitch immunity | Internal 25mV hysteresis and 13µs comparator response reject common noise transients |
| Open-drain RST/SRST with weak pull-ups | Enables OR-tied reset buses without external diodes; weak internal 6µA pull-ups reduce board space |
Applications
| Desktop Computers | Notebook Computers |
|---|---|
Use Scenario: Supervision of 2.5V core, 3.3V I/O, and adjustable VRM feedback voltage in ATX mainboards. IC Role / Device Role / Timing Role: Triple-supply monitor generating synchronized reset to CPU, chipset, and peripheral controllers. Use Value: Prevents boot failure due to out-of-spec 2.5V/3.3V sequencing; ±0.75% accuracy avoids marginal reset timing. |
Use Scenario: Power integrity monitoring in compact laptop motherboards with 2.5V SoC core, 3.3V display interface, and programmable DC/DC feedback. IC Role / Device Role / Timing Role: System supervisor asserting hard reset on brownout and soft reset on user-initiated reboot. Use Value: 20µA quiescent current extends battery life; 100µs SRST preserves DRAM contents during fast restarts. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Multi-rail power supervision in handheld test equipment with 2.5V ADC reference, 3.3V MCU, and adjustable sensor bias supply. IC Role / Device Role / Timing Role: Precision voltage monitor ensuring measurement validity before data acquisition begins. Use Value: Guaranteed reset assertion at VCC25 ≥ 1V prevents corrupted readings during partial power-up. |
Use Scenario: Power management in medical wearables using 2.5V BLE radio, 3.3V sensor hub, and adjustable battery gauge reference. IC Role / Device Role / Timing Role: Low-power supervisor enabling safe shutdown and wake-from-reset sequences. Use Value: Industrial temperature grade (–40°C to +85°C) ensures reliability in variable environmental conditions. |
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 open-drain reset outputs per rail (2.338V/3.086V/1V), ±1.5% threshold accuracy, no soft reset | Used where rail-specific reset control is required instead of combined RST assertion | Select when independent reset signaling per supply is needed; not suitable for shared reset bus architectures |
| LTC1728-2.5 | 5-pin SOT-23 package, push-pull RST output, same 2.5V/3.3V/ADJ thresholds, ±1.5% accuracy | Targeted at space-constrained PCBs where SOIC footprint is prohibitive | Choose for ultra-compact designs; lacks SRST and complementary RST outputs present in LTC1326IS8-2.5#TRPBF |
Compared with LTC1727-2.5 and LTC1728-2.5, the LTC1326IS8-2.5#TRPBF uniquely combines micropower operation (20µA), soft/hard reset modes, and complementary RST/RST outputs in an industry-standard SOIC-8 package-making it optimal for cost-sensitive, function-rich embedded systems requiring both robust power supervision and user-initiated reset flexibility.
Availability
LTC1326IS8-2.5#TRPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply, industrial temperature qualification, and long-term lifecycle support.
Supply support for LTC1326IS8-2.5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1326IS8-2.5#TRPBF belongs to Linear's precision power supervision product line, engineered for reliable reset generation in multi-voltage systems where accuracy, low power, and flexible reset modes are critical.
FAQ
What is the operating temperature range of the LTC1326IS8-2.5#TRPBF?
The LTC1326IS8-2.5#TRPBF is rated for industrial operation from –40°C to +85°C (I-grade), as confirmed by Absolute Maximum Ratings and Electrical Characteristics tables in the official datasheet. This range ensures reliable performance in demanding embedded environments such as industrial controls and portable instrumentation where ambient temperatures fluctuate widely.
Does the LTC1326IS8-2.5#TRPBF support soft reset functionality?
Yes, the LTC1326IS8-2.5#TRPBF supports soft reset via its SRST pin (Pin 7). When the PBR pin (Pin 8) is held low for less than ≈2 seconds, the device asserts SRST for 100µs (typical), enabling DRAM-safe processor restarts without interrupting memory refresh cycles-a key feature validated in Applications Information section and Timing Diagram TD02.
What are the exact reset threshold voltages for the LTC1326IS8-2.5#TRPBF?
The LTC1326IS8-2.5#TRPBF has factory-trimmed thresholds: VRT25 = 2.363V (typ), VRT3 = 3.118V (typ), and VRTA = 1.000V (typ), all with ±0.75% accuracy over –40°C to +85°C. These values are explicitly listed in the Electrical Characteristics table under symbols VRT25, VRT3, and VRTA, and confirmed in Typical Performance Curves G09–G12.
Can the LTC1326IS8-2.5#TRPBF monitor only two supplies instead of three?
Yes, the LTC1326IS8-2.5#TRPBF supports dual-supply operation. Unused inputs (e.g., VCCA) can be tied to VCC3 or VCC25, and VCC25 may be strapped to VCC3 to disable its comparator-enabling use as a 3.3V-only or 2.5V/3.3V dual monitor, as detailed in the "Dual and Single Supply Monitor Operation" section of the datasheet.
What package type and compliance does the LTC1326IS8-2.5#TRPBF use?
The LTC1326IS8-2.5#TRPBF uses an 8-lead plastic SOIC (S8) package, 0.150-inch narrow body, with lead-free (RoHS-compliant) terminations and tape-and-reel packaging (#TRPBF suffix). Package dimensions and solder pad layout are fully specified in Drawing #05-08-1610, and thermal characteristics (θJA = 150°C/W) are provided in the Package Description section.
LTC1326IS8-2.5#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC1326IS8-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326IS8-2.5#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 LTC1326IS8-2.5#TRPBF reliable?
The price and inventory of LTC1326IS8-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326IS8-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1326IS8-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326IS8-2.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326IS8-2.5#TRPBF?
LTC1326IS8-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326IS8-2.5#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 LTC1326IS8-2.5#TRPBF?
For technical support, including LTC1326IS8-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326IS8-2.5#TRPBF requirements.
6.How does Aetrix verify that LTC1326IS8-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1326IS8-2.5#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 LTC1326IS8-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1326IS8-2.5#TRPBF?
All LTC1326IS8-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326IS8-2.5#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 LTC1326IS8-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1326IS8-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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