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Analog Devices Inc. LTC1326IMS8#TRPBF
- Part No.:
- LTC1326IMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1326IMS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,090
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Product details
Overview
LTC1326IMS8#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 an adjustable supply (VCCA). It delivers ±0.75% threshold accuracy, 20µA typical supply current, 200ms internal reset delay, and supports active-low/open-drain RST/SRST outputs with manual push-button reset functionality. It is used in portable battery-powered equipment to ensure reliable power-on and brownout reset sequencing.
For engineers reviewing the LTC1326IMS8#TRPBF datasheet, LTC1326IMS8#TRPBF pinout, LTC1326IMS8#TRPBF application, or LTC1326IMS8#TRPBF equivalent, key selection criteria include guaranteed reset assertion down to VCC3 ≥ 1V or VCC25 ≥ 1V, glitch-immune comparator response (~13µs), soft-reset pulse width (100µs typ), and MSOP-8 package compatibility with space-constrained embedded designs.
Technical Context
The LTC1326IMS8#TRPBF implements three independent high-accuracy voltage comparators-each with 25mV internal hysteresis-to supervise VCC25 (2.5V), VCC3 (3.3V), and VCCA (adjustable, ~1.0V threshold). Its internal power-detect/gate-drive circuit selects the highest valid supply (VCC25 or VCC3) to drive the RST output FET, ensuring correct logic state even during asymmetric power-up.
It integrates a 2-second PBR timer to distinguish soft reset (SRST, 100µs) from hard reset (RST, 200ms), plus a 20ms debounce counter on the PBR input. The RST and SRST outputs are open-drain with weak internal 6µA pull-ups to VCC3, supporting OR-tie with other reset sources and level-shifting via external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitoring Inputs | VCC25 (2.5V), VCC3 (3.3V), VCCA (adjustable ~1.0V); enables triple-rail supervision in mixed-voltage systems |
| Threshold Accuracy | ±0.75% over –40°C to +85°C; ensures deterministic reset timing without calibration |
| Quiescent Current | 20µA typical at TA = 25°C; supports multi-year battery life in portable instrumentation |
| Reset Pulse Width | 200ms nominal (RST); meets standard power-on reset timing requirements for microcontrollers |
| Soft Reset Pulse | 100µs typical (SRST); allows DRAM-refresh-preserving resets without system reboot |
| Operating Temp Range | –40°C to +85°C (I-grade); qualified for industrial and automotive under-hood environments |
| Power-On Reset Validity | RST guaranteed low for VCC25 ≥ 1V or VCC3 ≥ 1V; enables early reset assertion during slow-ramp supplies |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm footprint, 0.65mm pitch, θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC3 (Pin 1) | 3.3V sense input & IC power rail | Primary supply for internal circuitry; must be bypassed with ≥0.1µF ceramic capacitor |
| 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 (1.0V typ) | High-impedance comparator input; supports logic-level detection or DC/DC feedback monitoring |
| GND (Pin 4) | Ground reference | Common return for all analog and digital functions; requires low-impedance PCB connection |
| PBR (Pin 8) | Push-button reset input | Active-low, internally pulled up to VCC3 with 7µA; debounced (20ms) and timed (2s) for soft/hard reset mode selection |
| SRST (Pin 7) | Soft reset output | Open-drain, active-low; asserts 100µs pulse after short PBR press; supports OR-tie with other reset sources |
| RST (Pin 6) | Primary reset output | Open-drain, active-low; held low for 200ms after power stabilization or long PBR press; driven by highest valid supply rail |
| RST (Pin 5) | Inverted reset output | CMOS active-high buffered complement of RST; drives high to VCC3; pulled down externally to enable RST |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 20µA typical ICC enables use in always-on battery-backed systems without significant runtime penalty |
| Glitch-immune comparators | ~13µs response time + 25mV hysteresis prevents false resets from supply transients or noise |
| Dual-mode push-button reset | Hardware-discriminated soft (100µs) vs hard (200ms) reset eliminates firmware dependency for user-initiated recovery |
| Multi-supply gate drive | Automatic selection between VCC25 and VCC3 to drive RST FET ensures valid reset assertion even if one rail is missing |
| ESD-enhanced PBR interface | Series 10kΩ resistor extends PBR ESD tolerance to ~10kV-critical for front-panel accessible reset buttons |
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-rail supervisor providing synchronized 200ms reset release after all supplies stabilize above thresholds. Use Value: Prevents CPU lockup due to out-of-spec VCORE during dynamic voltage scaling by asserting reset until all rails meet ±0.75% accuracy window. | Use Scenario: Managing power sequencing in ultra-thin notebooks with dual DC/DC converters feeding 2.5V SoC and 3.3V peripheral rails. IC Role / Device Role / Timing Role: Simultaneous monitoring of VCC25, VCC3, and VCCA (tied to DC/DC feedback node) to detect converter faults. Use Value: Enables immediate shutdown on single-rail failure while preserving DRAM contents via SRST-triggered soft reset during non-critical events. |
| Intelligent Instruments | Portable Battery-Powered Equipment |
Use Scenario: Ensuring clean startup of FPGA-based data acquisition modules powered by 2.5V analog, 3.3V digital, and 1.0V reference supplies. IC Role / Device Role / Timing Role: Precision threshold comparator with 200ms timeout guaranteeing FPGA configuration only after stable bias conditions. Use Value: Eliminates configuration errors caused by marginal VCCA during low-battery operation, leveraging guaranteed RST assertion down to VCC25 ≥ 1V. | Use Scenario: Supervising Li-ion powered handheld test meters with 2.5V sensor front-end, 3.3V MCU, and adjustable 1.0V reference rail. IC Role / Device Role / Timing Role: Micropower triple monitor enabling >5-year shelf life; PBR provides field-serviceable soft reset without full power cycle. Use Value: 20µA quiescent current extends battery life; 100µs SRST pulse preserves real-time clock and calibration data during user-initiated recovery. |
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/1.0V), ±1.5% accuracy, no PBR function | Used where rail-specific fault isolation is required; lacks push-button interface and soft reset capability | Select when independent reset signaling per supply is needed, not unified RST/SRST behavior |
| LTC1726-2.5 | Includes programmable watchdog timer and adjustable reset timeout; same 2.5V/3.3V/ADJ thresholds but ±1.0% accuracy | Targets systems requiring fail-safe recovery from software hangs, not just power faults | Select when watchdog functionality is mandatory and ±1.0% threshold tolerance is acceptable |
Compared with LTC1727-2.5 and LTC1726-2.5, the LTC1326IMS8#TRPBF offers tighter ±0.75% threshold accuracy and integrated push-button reset with hardware-debounced soft/hard modes-making it optimal for cost-sensitive, space-constrained applications where unified reset control and minimal BOM count are prioritized over per-rail diagnostics or watchdog features.
Availability
LTC1326IMS8#TRPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and portable battery-powered equipment requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for LTC1326IMS8#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 its high-performance analog and mixed-signal product lines, including precision power monitoring ICs.
The LTC1326IMS8#TRPBF belongs to Linear's micropower supply monitor family, engineered for reliable reset generation in multi-rail embedded systems where low quiescent current, high threshold accuracy, and robust transient immunity are critical.
FAQ
What is the primary function of the LTC1326IMS8#TRPBF?
The LTC1326IMS8#TRPBF is a micropower triple supply monitor IC that simultaneously supervises 2.5V, 3.3V, and an adjustable supply rail (VCCA), generating precise reset signals during power-up, brownout, or undervoltage conditions. It guarantees RST assertion down to VCC25 ≥ 1V or VCC3 ≥ 1V and supports both hardware-triggered soft reset (100µs) and hard reset (200ms) via its PBR pin. The LTC1326IMS8#TRPBF is optimized for space- and power-constrained embedded systems.
Does the LTC1326IMS8#TRPBF support 2.5V supply monitoring?
Yes, the LTC1326IMS8#TRPBF is the -2.5 variant specifically configured to monitor 2.5V (VCC25), 3.3V (VCC3), and an adjustable input (VCCA). Its VCC25 threshold is 2.363V (typ) with ±0.75% accuracy over –40°C to +85°C. The device uses VCC25 as a gate-drive source for the RST output FET when VCC25 exceeds VCC3, ensuring reliable reset assertion even if the 3.3V rail is absent. This makes the LTC1326IMS8#TRPBF ideal for modern low-voltage SoC platforms.
How does the push-button reset (PBR) function work on the LTC1326IMS8#TRPBF?
The PBR pin on the LTC1326IMS8#TRPBF distinguishes between soft and hard reset based on press duration: a press <2 seconds generates a 100µs active-low SRST pulse (preserving DRAM refresh), while a press >2 seconds triggers a full 200ms RST assertion. Internal 20ms debounce prevents contact bounce misfires. The PBR has a 7µA internal pull-up to VCC3 and tolerates voltages up to 7V. A series 10kΩ resistor can extend ESD tolerance to ~10kV-essential for front-panel implementations. This dual-mode behavior is fully hardware-based and requires no firmware intervention in the LTC1326IMS8#TRPBF.
What package type is used for the LTC1326IMS8#TRPBF?
The LTC1326IMS8#TRPBF uses the 8-lead plastic MSOP (MS8) package: 3.0mm × 3.0mm body, 0.65mm lead pitch, and 0.889mm maximum height. It features gull-wing leads, a 250°C/W junction-to-ambient thermal resistance (θJA), and RoHS-compliant lead-free termination (#TRPBF suffix). The MSOP-8 footprint is compatible with automated SMT assembly and offers superior thermal performance versus SO-8 in dense layouts. Pin 1 is marked with a dot; the package drawing reference is LTC DWG #05-08-1660.
Can the LTC1326IMS8#TRPBF be used as a dual or single supply monitor?
Yes, the LTC1326IMS8#TRPBF supports flexible configuration: VCCA can be tied to VCC3 or VCC25 to disable its comparator; VCC25 may be strapped to VCC3 to operate as a dual 3.3V/adjustable monitor. For single-rail use, tying VCC25 to VCC3 and using only VCC3/VCCA enables 3.3V + adjustable monitoring. The device's internal override logic (e.g., VCC25 disable when within ±25mV of VCC3 and <4.15V) allows reconfiguration without external components. All configurations retain the LTC1326IMS8#TRPBF's 20µA quiescent current and ±0.75% accuracy.
LTC1326IMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LTC1326IMS8#TRPBF FAQ
1.How can I place an order for LTC1326IMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1326IMS8#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 LTC1326IMS8#TRPBF reliable?
The price and inventory of LTC1326IMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1326IMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1326IMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1326IMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1326IMS8#TRPBF?
LTC1326IMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1326IMS8#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 LTC1326IMS8#TRPBF?
For technical support, including LTC1326IMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1326IMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1326IMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1326IMS8#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 LTC1326IMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1326IMS8#TRPBF?
All LTC1326IMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1326IMS8#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 LTC1326IMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1326IMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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