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Analog Devices Inc. LTC1326IMS8#PBF
- Part No.:
- LTC1326IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1326IMS8#PBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:866
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Product details
Overview
LTC1326IMS8#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 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 LTC1326IMS8#PBF datasheet, LTC1326IMS8#PBF pinout, LTC1326IMS8#PBF application, or LTC1326IMS8#PBF equivalent, key selection considerations include its guaranteed RST assertion down to VCC3 ≥ 1V or VCC25 ≥ 1V, glitch-immune comparators with 13µs response time, dual-mode reset (200ms hard / 100µs soft), and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC1326IMS8#PBF implements three independent high-accuracy voltage comparators (for VCC25, VCC3, and VCCA) with internal 200ms reset timer and PBR-triggered dual-mode reset logic. Its power-detect/gate-drive architecture selects the highest valid supply (VCC3 or VCC25) to drive the RST output FET, ensuring correct reset state even during asymmetric power-up sequences.
It features internal 7µA PBR pull-up, 6µA weak pull-ups on RST/SRST, 20ms debounce on push-button input, and override capability allowing configuration as dual- or single-supply monitor by strapping unused inputs - all while maintaining guaranteed reset validity across –40°C to 85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | VCC25 (2.5V), VCC3 (3.3V), VCCA (adjustable ~1V); enables triple-rail supervision in mixed-voltage systems |
| Threshold Accuracy | ±0.75% over –40°C to 85°C; ensures reliable reset without false triggering during voltage transients |
| Supply Current | 20µA typical at TA = 25°C; supports battery-powered and ultra-low-power system designs |
| Reset Pulse Width | 200ms nominal hard reset; guarantees sufficient processor initialization time after power stabilization |
| Soft Reset Pulse | 100µs typical; allows DRAM-refresh-preserving microprocessor reset without memory loss |
| Operating Temp Range | –40°C to +85°C (I-grade); qualified for industrial and extended-temperature embedded applications |
| Reset Propagation Delay | 25ns tPHL / 45ns tPLH; enables fast response to supply faults without compromising noise immunity |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm body, 0.65mm pitch, JEDEC MO-187AC compliant. Thermal resistance θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V sense input & IC power rail | Main power source for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor to GND |
| VCC25 (Pin 2) | 2.5V sense input | Used as gate-drive source for RST FET when VCC25 > VCC3; tied to VCC3 if unused |
| VCCA (Pin 3) | Adjustable threshold input (~1V) | High-impedance comparator input for custom rail monitoring; can be tied to VCC3 or VCC25 if unused |
| GND (Pin 4) | Ground reference | Common return path for all internal comparators and output drivers |
| RST (Pin 5) | Active-high CMOS reset output | Buffered complement of open-drain RST (Pin 6); drives high to VCC3; requires external pull-down for logic high |
| RST (Pin 6) | Active-low open-drain reset output | Primary reset signal; OR-tie capable; guaranteed low ≤0.4V at 5mA sink; weak internal 6µA pull-up to VCC3 |
| SRST (Pin 7) | Active-low open-drain soft reset | 100µs pulse output triggered by short PBR press; preserves DRAM refresh; same electrical specs as RST (Pin 6) |
| PBR (Pin 8) | Push-button reset input | Active-low with 7µA internal pull-up to VCC3; 20ms debounce; <2s press → SRST; >2s press → 200ms RST assertion |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring with configurable inputs | Supports 2.5V/3.3V/adj supervision simultaneously; VCC25/VCC3/VCCA inputs can be individually disabled via strapping for dual/single-rail use |
| Guaranteed reset down to 1V supply | RST remains valid and asserted even when VCC3 or VCC25 drops to 1V - critical for brownout detection in low-voltage systems |
| Power-detect gate drive architecture | Automatically selects highest valid supply (VCC3 or VCC25) to drive RST output FET, ensuring robust reset assertion during asymmetric power sequencing |
| Glitch-immune comparators | 13µs typical response time + 0.1µF per-input bypassing suppresses transients up to 40µs duration - prevents false resets from noise |
| ESD-enhanced PBR interface | Series 10kΩ resistor extends PBR ESD tolerance to ~10kV - safe for front-panel button routing without additional protection |
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 reset pulse upon any rail undervoltage, with soft-reset capability for firmware-triggered recovery. Use Value: Prevents CPU lockup during partial power failure; 100µs SRST preserves DRAM state during debug-mode reboots. | Use Scenario: Monitoring battery-backed 2.5V logic, 3.3V USB PHY, and dynamically scaled VCORE in ultrabook platforms. IC Role / Device Role / Timing Role: Precision supply supervisor with guaranteed reset assertion down to VCC25 ≥ 1V, enabling graceful shutdown before brownout-induced corruption. Use Value: ±0.75% threshold accuracy avoids premature reset during Li-ion discharge curve; 20µA quiescent current extends standby time. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring clean startup of FPGA-based data acquisition modules powered by isolated DC/DC converters. IC Role / Device Role / Timing Role: Triple-rail supervisor validating 2.5V ADC reference, 3.3V digital core, and adjustable analog bias supply prior to sampling initialization. Use Value: 200ms reset delay aligns with FPGA configuration time; VCCA input monitors custom 1.0V bias rail with 1.000V ±0.007V trip point. | Use Scenario: Managing power sequencing in handheld medical devices with 2.5V sensor interface, 3.3V MCU, and programmable 1.0–3.0V analog subsystem. IC Role / Device Role / Timing Role: Micropower supply monitor providing both hard reset (200ms) and soft reset (100µs) via tactile button, preserving volatile calibration data. Use Value: 20µA supply current minimizes battery drain in sleep mode; MSOP-8 footprint fits compact 4-layer PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1726-2.5IMS8#PBF | Includes adjustable watchdog timeout (1.6s–16s) and separate RESET timeout control; higher 35µA supply current | Required where system-level fault recovery mandates timed watchdog reset in addition to supply monitoring | Select LTC1726-2.5IMS8#PBF only if watchdog functionality is needed; otherwise LTC1326IMS8#PBF offers lower power and simpler timing |
| LTC1727-2.5IMS8#PBF | Provides individual open-drain reset outputs per rail (RST25, RST33, RSTA); ±1.5% threshold accuracy vs ±0.75% | Suitable when independent reset signaling per supply is required for modular power domain control | Choose LTC1727-2.5IMS8#PBF for rail-isolated reset generation; LTC1326IMS8#PBF is preferred for cost-sensitive, single-reset-bus designs |
Compared with LTC1726-2.5IMS8#PBF and LTC1727-2.5IMS8#PBF, the LTC1326IMS8#PBF delivers tighter threshold accuracy (±0.75% vs ±1.5%) and lower quiescent current (20µA vs 35µA), making it optimal for precision-critical, battery-constrained applications where integrated watchdog or per-rail reset outputs are unnecessary.
Availability
LTC1326IMS8#PBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and intelligent instruments requiring stable component supply with guaranteed long-term industrial temperature support (–40°C to +85°C).
Supply support for LTC1326IMS8#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC series.
The LTC1326IMS8#PBF belongs to Linear's precision power supervision product line, engineered specifically for high-accuracy, low-power multi-rail monitoring in computing, instrumentation, and portable electronics where supply integrity directly impacts system reliability.
FAQ
What is the operating temperature range for the LTC1326IMS8#PBF?
The LTC1326IMS8#PBF is rated for industrial operation from –40°C to +85°C (I-grade). This is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The "I" in the part number explicitly denotes this extended temperature range, distinguishing it from the commercial-grade C-version (0°C to 70°C).
Does the LTC1326IMS8#PBF support monitoring of a 2.5V supply?
Yes, the LTC1326IMS8#PBF is the -2.5 variant and is specifically configured to monitor 2.5V (VCC25), 3.3V (VCC3), and an adjustable rail (VCCA ≈1V). Its VCC25 input has a guaranteed reset threshold of 2.363V (typ) with ±0.75% accuracy over temperature, making it suitable for precise 2.5V rail supervision in modern low-voltage systems.
How does the push-button reset function work on the LTC1326IMS8#PBF?
The LTC1326IMS8#PBF implements dual-mode push-button reset: a short press (<2 seconds) asserts SRST for 100µs (soft reset), preserving DRAM; a long press (>2 seconds) asserts RST for 200ms (hard reset). Internal 20ms debounce prevents contact bounce artifacts, and the PBR pin features a 7µA internal pull-up to VCC3 - eliminating need for external components in basic implementations.
Can the LTC1326IMS8#PBF be used with only two supply rails?
Yes, the LTC1326IMS8#PBF supports dual- and single-supply configurations via input strapping. For example, tying VCC25 to VCC3 disables the 2.5V monitor, leaving VCC3 and VCCA active. Similarly, tying VCCA to VCC3 disables the adjustable input. These override techniques are documented in the Applications Information section and maintain full accuracy and timing behavior for the remaining active rails.
What package type is used for the LTC1326IMS8#PBF?
The LTC1326IMS8#PBF uses the 8-lead plastic MSOP (MS8) package: 3.0mm × 3.0mm body, 0.65mm lead pitch, and 0.889mm maximum height. This compact surface-mount package is RoHS-compliant (indicated by #PBF suffix) and optimized for high-density PCB layouts in space-constrained applications such as notebooks and portable instrumentation.
LTC1326IMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-MSOP
LTC1326IMS8#PBF FAQ
1.How can I place an order for LTC1326IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326IMS8#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 LTC1326IMS8#PBF reliable?
The price and inventory of LTC1326IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1326IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326IMS8#PBF?
LTC1326IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326IMS8#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 LTC1326IMS8#PBF?
For technical support, including LTC1326IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326IMS8#PBF requirements.
6.How does Aetrix verify that LTC1326IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1326IMS8#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 LTC1326IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1326IMS8#PBF?
All LTC1326IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326IMS8#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 LTC1326IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1326IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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